New: ssh connections hang with 2.6.26-rc5
Subsystems (3)
A message that is not in the archive (sent off-list or not yet received): [email protected]/
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
Quoted 35 lines · On Fri, 13 Jun 2008 02:39:17 -0700 (PDT) [email protected] wrote:
http://bugzilla.kernel.org/show_bug.cgi?id=10903
Summary: ssh connections hang with 2.6.26-rc5 Product: Networking Version: 2.5 KernelVersion: 2.6.26-rc5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other AssignedTo: [email protected] ReportedBy: [email protected]Latest working kernel version: 2.6.25-2
Earliest failing kernel version: 2.6.26-rc5
Distribution: Debian (Lenny + Sid)
Hardware Environment: amd64 (Dell Latitude D630)
Software Environment: KDE
Problem Description:With kernel version 2.6.26-rc5, the ssh connections to remote servers randomly hang (no error message). No amelioration despite the activation of "ServerAliveInterval" on both sides.
Steps to reproduce:
Connect to a remote ssh server and do some stuff. After some time, the connection will hang.
Please ask for details.
Quoted 34 lines · Andrew Morton
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
Quoted 28 lines · On Fri, 13 Jun 2008 02:39:17 -0700 (PDT) [email protected] wrote:
http://bugzilla.kernel.org/show_bug.cgi?id=10903
Summary: ssh connections hang with 2.6.26-rc5 Product: Networking Version: 2.5 KernelVersion: 2.6.26-rc5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other AssignedTo: [email protected] ReportedBy: [email protected]Latest working kernel version: 2.6.25-2
Earliest failing kernel version: 2.6.26-rc5
Distribution: Debian (Lenny + Sid)
Hardware Environment: amd64 (Dell Latitude D630)
Software Environment: KDE
Problem Description:With kernel version 2.6.26-rc5, the ssh connections to remote servers randomly
hang (no error message). No amelioration despite the activation of "ServerAliveInterval" on both sides.
Thanks for reporting. Could you please clarify couple of things:
Does this only happen with a particular server/servers?
Any middleboxes in between (NAT, firewall, etc.)?
Do all ssh connections hang simultaneously?
How long have you waited until concluding that TCP is "hung"? Is TSO enabled (ethtool -k)? Have you tried without it?
It wouldn't hurt to include info about eth hw too (e.g., lspci), though it might turn unneeded at some point of time but it might save an email round-trip.
TCP can appear to hang due to vast number of reasons. Only recent changes that are suspectable is the DEFERRED_ACCEPT thing which is already reverted in the very latest Linus' tree (even -rc6 is too old for that) and few FRTO fixes (you can exclude FRTO by turning /proc/sys/net/ipv4/tcp_frto sysctl to 0 but it seems quite unlikely to change anything); your problem might well come from something else and TCP hang is just a symptom of other problem downstream.
So please gather this information (at least for the relevant connections):
$ netstat -pn $ cat /proc/net/tcp
...Also a tcpdump might be handy (though I don't know yet).
...Depending on your privacy needs, you may want obfuscate ip addresses that are revealed by all of those logs (ie., if you don't want to reveal with whom you're communicating with, ssh payload is encrypted anyway).
Quoted 6 lines
Quoted 6 lines
Steps to reproduce:
Connect to a remote ssh server and do some stuff. After some time, the connection will hang.
Please ask for details.
(I'll be away nearly a month after Tuesday, so I probably won't have much time to resolve this issue but I hope I've some time to take a look before I leave).
Signature · 1 line
i.
Le samedi 14 juin 2008 22:45:41 Ilpo Järvinen, vous avez écrit :
Quoted 3 lines · Andrew Morton
Quoted 2 lines
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
OK.
Quoted 1 line
Quoted 1 line
On Fri, 13 Jun 2008 02:39:17 -0700 (PDT) [email protected]
Quoted 24 lines · wrote:
Quoted 24 lines
Quoted 24 lines
http://bugzilla.kernel.org/show_bug.cgi?id=10903
Summary: ssh connections hang with 2.6.26-rc5 Product: Networking Version: 2.5 KernelVersion: 2.6.26-rc5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other AssignedTo: [email protected] ReportedBy: [email protected]Latest working kernel version: 2.6.25-2
Earliest failing kernel version: 2.6.26-rc5
Distribution: Debian (Lenny + Sid)
Hardware Environment: amd64 (Dell Latitude D630)
Software Environment: KDE
Problem Description:
Quoted 6 lines
Quoted 4 lines
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With kernel version 2.6.26-rc5, the ssh connections to remote servers randomly
hang (no error message). No amelioration despite the activation of "ServerAliveInterval" on both sides.Thanks for reporting. Could you please clarify couple of things:
Hi.
I will try to, with my time and knowledge.
Quoted 1 line
Does this only happen with a particular server/servers?
I have only tried with two of my home servers. One runs 2.6.22-4-686 and the other 2.6.18-6-vserver-686.
Quoted 1 line
Any middleboxes in between (NAT, firewall, etc.)?
There is a ADSL router which "provides" internet to the servers by NAT. I have tried from "inside" the house (so in the same subnet) and from outside: it hangs in both cases.
The common point is my use of "iwl3945" : I have always tried the ssh connections through WiFi.
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Do all ssh connections hang simultaneously?
Well... It is hard to say. As far as I have seen, no. When I get one hang, I can successfully connect to the same server.
Quoted 1 line
How long have you waited until concluding that TCP is "hung"?
Well. The "ServerAliveInterval" option of openssh now leads to "Received disconnect from $IP: 2: Timeout, your session not responding." after the hang. So the openssh server notices that my session is not responding and so cuts the connection.
Quoted 1 line
Is TSO enabled (ethtool -k)? Have you tried without it?
Doesn't seem:
----
# ethtool -k wlan0 Offload parameters for wlan0: Cannot get device rx csum settings: Operation not supported Cannot get device tx csum settings: Operation not supported Cannot get device scatter-gather settings: Operation not supported Cannot get device tcp segmentation offload settings: Operation not supported Cannot get device udp large send offload settings: Operation not supported Cannot get device generic segmentation offload settings: Operation not supported no offload info available ----
Quoted 3 lines
It wouldn't hurt to include info about eth hw too (e.g., lspci), though it might turn unneeded at some point of time but it might save an email round-trip.
lspci attached.
Quoted 7 lines
TCP can appear to hang due to vast number of reasons. Only recent changes that are suspectable is the
DEFERRED_ACCEPTthing which is already reverted in the very latest Linus' tree (even -rc6 is too old for that) and few FRTO fixes (you can exclude FRTO by turning/proc/sys/net/ipv4/tcp_frtosysctl to 0 but it seems quite unlikely to change anything); your problem might well come from something else and TCP hang is just a symptom of other problem downstream.
I can't understand everything, but what I can say is that with the exact same software, I get no hangs with 2.6.25-2 but I get some with 2.6.26-rc5.
Quoted 4 lines
So please gather this information (at least for the relevant connections):
$ netstat -pn $ cat /proc/net/tcp
Attached.
Quoted 1 line
...Also a tcpdump might be handy (though I don't know yet).
Well. It seems that there is another bug here: everytime I tried a
# tcpdump -w /tmp/tcpdump.wlan0 -i wlan0
I got a CPU lockup (or similar, can't know exactly, but keyboard blocked and nothing doable).
Quoted 9 lines
...Depending on your privacy needs, you may want obfuscate ip addresses that are revealed by all of those logs (ie., if you don't want to reveal with whom you're communicating with, ssh payload is encrypted anyway).
(...)
(I'll be away nearly a month after Tuesday, so I probably won't have much time to resolve this issue but I hope I've some time to take a look before I leave).
We'll see ;)
Regards,
OdyX
Signature · 3 lines
Didier Raboud, proud Debian user. CH-1802 Corseaux [email protected]
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c) 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c) 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c) 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02) 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02) 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02) 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02) 00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 02) 00:1c.5 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 6 (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f2)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 02) 00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 02) 00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
03:01.0 CardBus bridge: O2 Micro, Inc. Cardbus bridge (rev 21)
03:01.4 FireWire (IEEE 1394): O2 Micro, Inc. Firewire (IEEE 1394) (rev 02)
09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5755M Gigabit Ethernet PCI Express (rev 02) 0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02)
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 192.168.1.11:57063 128.178.222.18:143 ESTABLISHED 11314/klauncher0EyU tcp 0 0 192.168.1.11:54596 192.168.1.3:9000 ESTABLISHED 11125/klauncher0EyU tcp 0 0 192.168.1.11:54591 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54587 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54589 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54583 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54584 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:47334 217.150.254.106:5223 ESTABLISHED 4437/kopete tcp 0 0 192.168.1.11:54593 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:36357 192.168.1.2:22 TIME_WAIT - tcp 0 0 192.168.1.11:54592 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54588 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:53858 195.144.11.40:143 ESTABLISHED 4799/klauncher0EyU tcp 0 0 192.168.1.11:54586 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54595 192.168.1.3:9000 ESTABLISHED 11129/klauncher0EyU tcp 0 0 192.168.1.11:38449 212.25.25.37:143 ESTABLISHED 4801/klauncher0EyU tcp 0 0 192.168.1.11:40539 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54590 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:54594 192.168.1.3:9000 TIME_WAIT - tcp 0 0 192.168.1.11:33066 84.16.68.124:143 ESTABLISHED 4800/klauncher0EyU tcp 0 0 192.168.1.11:38525 192.168.1.3:22 ESTABLISHED 13828/ssh tcp 0 0 192.168.182.18:60514 213.134.45.154:443 ESTABLISHED 4666/klauncher0EyU tcp 0 0 192.168.1.11:54585 192.168.1.3:9000 TIME_WAIT - Active UNIX domain sockets (w/o servers) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 3 [ ] DGRAM 20699 - /var/run/wpa_supplicant/wlan0 unix 2 [ ] DGRAM 20625 - /var/run/wpa_supplicant-global unix 2 [ ] DGRAM 20701 - /var/run/NetworkManager/wpa_ctrl_3855-19 unix 2 [ ] DGRAM 3393 - @/org/kernel/udev/udevd unix 9 [ ] DGRAM 7553 - /dev/log unix 2 [ ] DGRAM 8303 - @/org/freedesktop/hal/udev_event unix 3 [ ] STREAM CONNECTED 41908 4366/klauncher [kde /tmp/ksocket-didier/klauncher0EyUjc.slave-socket unix 3 [ ] STREAM CONNECTED 41906 4808/klauncher0EyUj unix 3 [ ] STREAM CONNECTED 41564 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 41563 13658/klauncher0EyU unix 3 [ ] STREAM CONNECTED 41562 4467/kontact /tmp/ksocket-didier/kontact28e1Ub.slave-socket unix 3 [ ] STREAM CONNECTED 41560 13658/klauncher0EyU unix 3 [ ] STREAM CONNECTED 41552 4467/kontact /tmp/ksocket-didier/kontactxiTI2a.slave-socket unix 3 [ ] STREAM CONNECTED 41550 13657/klauncher0EyU unix 3 [ ] STREAM CONNECTED 38904 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 38903 13293/klauncher0EyU unix 3 [ ] STREAM CONNECTED 38902 4462/konqueror [kde /tmp/ksocket-didier/konqueroroMrdRa.slave-socket unix 3 [ ] STREAM CONNECTED 38900 13293/klauncher0EyU unix 3 [ ] STREAM CONNECTED 28499 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 28498 4366/klauncher [kde unix 3 [ ] STREAM CONNECTED 26499 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 26498 11314/klauncher0EyU unix 3 [ ] STREAM CONNECTED 26486 4467/kontact /tmp/ksocket-didier/kontactoijRSa.slave-socket unix 3 [ ] STREAM CONNECTED 26485 11314/klauncher0EyU unix 3 [ ] STREAM CONNECTED 25452 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 25451 11129/klauncher0EyU unix 3 [ ] STREAM CONNECTED 25450 4462/konqueror [kde /tmp/ksocket-didier/konqueror3DG8Oa.slave-socket unix 3 [ ] STREAM CONNECTED 25448 11129/klauncher0EyU unix 3 [ ] STREAM CONNECTED 25432 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 25431 11125/klauncher0EyU unix 3 [ ] STREAM CONNECTED 25429 4462/konqueror [kde /tmp/ksocket-didier/konquerorCg3z9b.slave-socket unix 3 [ ] STREAM CONNECTED 25425 11125/klauncher0EyU unix 3 [ ] STREAM CONNECTED 22199 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 22198 4801/klauncher0EyU unix 3 [ ] STREAM CONNECTED 22174 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 22173 4799/klauncher0EyU unix 3 [ ] STREAM CONNECTED 22156 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 22155 4800/klauncher0EyU unix 3 [ ] STREAM CONNECTED 21407 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 21406 10664/kmix [kdeinit unix 3 [ ] STREAM CONNECTED 21405 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 21402 10664/kmix [kdeinit unix 3 [ ] STREAM CONNECTED 21399 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 21398 10664/kmix [kdeinit unix 2 [ ] DGRAM 20736 - unix 3 [ ] STREAM CONNECTED 19277 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 19276 10280/kio_uiserver unix 3 [ ] STREAM CONNECTED 19275 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 19272 10280/kio_uiserver unix 3 [ ] STREAM CONNECTED 19265 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 19264 10280/kio_uiserver unix 3 [ ] STREAM CONNECTED 12984 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 12983 4666/klauncher0EyU unix 3 [ ] STREAM CONNECTED 12761 4467/kontact /tmp/ksocket-didier/kontactsTY3Bb.slave-socket unix 3 [ ] STREAM CONNECTED 12687 4801/klauncher0EyU unix 3 [ ] STREAM CONNECTED 12759 4467/kontact /tmp/ksocket-didier/kontactYyQzta.slave-socket unix 3 [ ] STREAM CONNECTED 12681 4800/klauncher0EyU unix 3 [ ] STREAM CONNECTED 12764 4467/kontact /tmp/ksocket-didier/kontactUfNfjb.slave-socket unix 3 [ ] STREAM CONNECTED 12678 4799/klauncher0EyU unix 3 [ ] STREAM CONNECTED 11713 4368/kded [kdeinit] /tmp/ksocket-didier/kdedN1sj7b.slave-socket unix 3 [ ] STREAM CONNECTED 11712 4666/klauncher0EyU unix 3 [ ] STREAM CONNECTED 11480 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 11479 4626/kttsd unix 3 [ ] STREAM CONNECTED 11476 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 11475 4626/kttsd unix 3 [ ] STREAM CONNECTED 11472 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 11471 4626/kttsd unix 3 [ ] STREAM CONNECTED 11448 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 11447 4621/kwalletmanager unix 3 [ ] STREAM CONNECTED 11440 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 11439 4621/kwalletmanager unix 3 [ ] STREAM CONNECTED 11436 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 11435 4621/kwalletmanager unix 3 [ ] STREAM CONNECTED 11399 4612/ispell unix 3 [ ] STREAM CONNECTED 11398 4467/kontact unix 3 [ ] STREAM CONNECTED 11397 4612/ispell unix 3 [ ] STREAM CONNECTED 11396 4467/kontact unix 3 [ ] STREAM CONNECTED 11395 4467/kontact unix 3 [ ] STREAM CONNECTED 11394 4612/ispell unix 3 [ ] STREAM CONNECTED 11392 4370/gam_server @/tmp/fam-didier- unix 3 [ ] STREAM CONNECTED 11391 4467/kontact unix 3 [ ] STREAM CONNECTED 10985 4427/artsd /tmp/ksocket-didier/Tamino-114b-48551204 unix 3 [ ] STREAM CONNECTED 10984 4504/knotify [kdein unix 3 [ ] STREAM CONNECTED 10899 - /var/run/sdp unix 3 [ ] STREAM CONNECTED 10898 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10890 - /var/run/dbus/system_bus_socket unix 3 [ ] STREAM CONNECTED 10889 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10888 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10887 4467/kontact unix 3 [ ] STREAM CONNECTED 10884 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10883 4462/konqueror [kde unix 3 [ ] STREAM CONNECTED 10882 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10881 4467/kontact unix 3 [ ] STREAM CONNECTED 10878 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10877 4467/kontact unix 3 [ ] STREAM CONNECTED 10872 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10871 4467/kontact unix 3 [ ] STREAM CONNECTED 10859 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10858 4467/kontact unix 3 [ ] STREAM CONNECTED 10840 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10839 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10838 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10837 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10834 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10833 4514/kbluetooth unix 3 [ ] STREAM CONNECTED 10809 - /var/run/dbus/system_bus_socket unix 3 [ ] STREAM CONNECTED 10808 4475/python unix 3 [ ] STREAM CONNECTED 10805 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10804 4475/python unix 3 [ ] STREAM CONNECTED 10768 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10767 4475/python unix 3 [ ] STREAM CONNECTED 10741 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10740 4504/knotify [kdein unix 3 [ ] STREAM CONNECTED 10723 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10722 4504/knotify [kdein unix 3 [ ] STREAM CONNECTED 10718 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10717 4504/knotify [kdein unix 3 [ ] STREAM CONNECTED 10656 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10655 4467/kontact unix 3 [ ] STREAM CONNECTED 10652 - /var/run/dbus/system_bus_socket unix 3 [ ] STREAM CONNECTED 10651 4486/kpowersave [kd unix 3 [ ] STREAM CONNECTED 10646 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10645 4488/klipper [kdein unix 3 [ ] STREAM CONNECTED 10642 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10641 4488/klipper [kdein unix 3 [ ] STREAM CONNECTED 10640 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10639 4488/klipper [kdein unix 3 [ ] STREAM CONNECTED 10628 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10627 4486/kpowersave [kd unix 3 [ ] STREAM CONNECTED 10624 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10623 4486/kpowersave [kd unix 3 [ ] STREAM CONNECTED 10622 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10621 4486/kpowersave [kd unix 3 [ ] STREAM CONNECTED 10612 4370/gam_server @/tmp/fam-didier- unix 3 [ ] STREAM CONNECTED 10611 4482/korgac unix 3 [ ] STREAM CONNECTED 10608 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10607 4368/kded [kdeinit] unix 3 [ ] STREAM CONNECTED 10603 - /var/run/dbus/system_bus_socket unix 3 [ ] STREAM CONNECTED 10602 4483/knetworkmanage unix 3 [ ] STREAM CONNECTED 10591 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10590 4483/knetworkmanage unix 3 [ ] STREAM CONNECTED 10587 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10586 4483/knetworkmanage unix 3 [ ] STREAM CONNECTED 10585 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10584 4483/knetworkmanage unix 3 [ ] STREAM CONNECTED 10573 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10572 4482/korgac unix 3 [ ] STREAM CONNECTED 10569 - /tmp/.X11-unix/X0 unix 3 [ ] STREAM CONNECTED 10568 4482/korgac unix 3 [ ] STREAM CONNECTED 10567 4363/dcopserver [kd /tmp/.ICE-unix/dcop4363-1213534701 unix 3 [ ] STREAM CONNECTED 10566 4482/korgac unix 3 [ ] STREAM CONNECTED 10562 4481/ispell unix 3 [ ] STREAM CONNECTED 10561 4433/katapult unix 3 [ ] STREAM CONNECTED 10560 4481/ispell unix 3 [ ] STREAM CONNECTED 10559 4433/katapult unix 3 [ ] STREAM CONNECTED 10558 4433/katapult unix 3 [ ] STREAM CONNECTED 10557 4481/ispell unix 3 [ ] STREAM CONNECTED 10486 4380/ksmserver [kde /tmp/.ICE-unix/4380 unix 3 [ ] STREAM CONNECTED 10485 4467/kontact unix 3 [ ] STREAM CONNECTED 10482 - 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Quoted 46 lines · Didier Raboud
Le samedi 14 juin 2008 22:45:41 Ilpo Järvinen, vous avez écrit :
Quoted 3 lines · Andrew Morton
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(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
OK.
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On Fri, 13 Jun 2008 02:39:17 -0700 (PDT) [email protected]
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http://bugzilla.kernel.org/show_bug.cgi?id=10903
Summary: ssh connections hang with 2.6.26-rc5 Product: Networking Version: 2.5 KernelVersion: 2.6.26-rc5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other AssignedTo: [email protected] ReportedBy: [email protected]Latest working kernel version: 2.6.25-2
Earliest failing kernel version: 2.6.26-rc5
Distribution: Debian (Lenny + Sid)
Hardware Environment: amd64 (Dell Latitude D630)
Software Environment: KDE
Problem Description:Quoted 6 lines
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With kernel version 2.6.26-rc5, the ssh connections to remote servers randomly
hang (no error message). No amelioration despite the activation of "ServerAliveInterval" on both sides.Thanks for reporting. Could you please clarify couple of things:
Hi.
I will try to, with my time and knowledge.
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Does this only happen with a particular server/servers?
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I have only tried with two of my home servers. One runs 2.6.22-4-686 and the other 2.6.18-6-vserver-686.
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Any middleboxes in between (NAT, firewall, etc.)?
There is a ADSL router which "provides" internet to the servers by NAT. I have tried from "inside" the house (so in the same subnet) and from
outside: it hangs in both cases.
...Ok. Those have some timeouts for idle sessions, so if one has active or keepalived sessions that shouldn't be a problem.
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The common point is my use of "iwl3945" : I have always tried the ssh connections through WiFi.
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Do all ssh connections hang simultaneously?
Well... It is hard to say. As far as I have seen, no. When I get one hang, I can successfully connect to the same server.
It's quite likely that the hangs are independent, but it was worth of confirming still.
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How long have you waited until concluding that TCP is "hung"?
Well. The "ServerAliveInterval" option of openssh now leads to "Received disconnect from $IP: 2: Timeout, your session not responding." after the hang. So the openssh server notices that my session is not responding and so cuts the connection.
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Is TSO enabled (ethtool -k)? Have you tried without it?
Doesn't seem:
----
# ethtool -k wlan0 Offload parameters for wlan0: Cannot get device rx csum settings: Operation not supported Cannot get device tx csum settings: Operation not supported Cannot get device scatter-gather settings: Operation not supported Cannot get device tcp segmentation offload settings: Operation not supported Cannot get device udp large send offload settings: Operation not supported Cannot get device generic segmentation offload settings: Operation not supported no offload info available ----
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It wouldn't hurt to include info about eth hw too (e.g., lspci), though it might turn unneeded at some point of time but it might save an email round-trip.
lspci attached.
...Thanks for all the details. I especially appreciated the kernel versions of the servers since TCP has two end hosts (and I forgot to ask)... :-)
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TCP can appear to hang due to vast number of reasons. Only recent changes that are suspectable is the
DEFERRED_ACCEPTthing which is already reverted in the very latest Linus' tree (even -rc6 is too old for that) and few FRTO fixes (you can exclude FRTO by turning/proc/sys/net/ipv4/tcp_frtosysctl to 0 but it seems quite unlikely to change anything); your problem might well come from something else and TCP hang is just a symptom of other problem downstream.I can't understand everything, but what I can say is that with the exact same software, I get no hangs with 2.6.25-2 but I get some with 2.6.26-rc5.
Yes, I understand that... I was just trying to bring up above what has changed between those kernels :-). ...Quite few TCP related changes actually (there were also some TSO related changes but they're not significant in your case).
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So please gather this information (at least for the relevant connections):
$ netstat -pn $ cat /proc/net/tcpAttached.
I probably wasn't specific enough. ...I meant that you would get this once one of the ssh sessions gets stuck (do it right after you notice that the session is stuck, that should get the info before the connection is cut down). This info should be collected from both ends (on client and server).
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...Also a tcpdump might be handy (though I don't know yet).
Well. It seems that there is another bug here: everytime I tried a
Ah, lets try to figure that one out as well...
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# tcpdump -w /tmp/tcpdump.wlan0 -i wlan0I got a CPU lockup (or similar, can't know exactly, but keyboard blocked and nothing doable).
You probably run it under X, no? Please switch beforehand to some other vt (a textual one) then (Ctrl-Alt-Fn, where n < 6) and then log in and running that command there and see if you get some output into screen there. If you see something (e.g., a sudden OOPS message or some other warning printed) when it locks up, the easiest things is to take a shot with a digicam (or write it down somewhere else) and send that shot (or those details) to us please.
...Once you have a tcpdump, I can probably figure at least something out (though it might still just point to the right direction rather than exposing the actual cause).
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A message that is not in the archive (sent off-list or not yet received): [email protected]
Quoted 40 lines · Didier Raboud
Le lundi 16 juin 2008 15:21:25 Ilpo J�rvinen, vous avez �crit�:
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http://bugzilla.kernel.org/show_bug.cgi?id=10903
Summary: ssh connections hang with 2.6.26-rc5 Product: Networking Version: 2.5 KernelVersion: 2.6.26-rc5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other AssignedTo: [email protected] ReportedBy: [email protected]Latest working kernel version: 2.6.25-2
Earliest failing kernel version: 2.6.26-rc5
Distribution: Debian (Lenny + Sid)
Hardware Environment: amd64 (Dell Latitude D630)
Software Environment: KDE
Problem Description:With kernel version 2.6.26-rc5, the ssh connections to remote servers randomly
hang (no error message). No amelioration despite the activation of "ServerAliveInterval" on both sides.(...)
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The common point is my use of "iwl3945" : I have always tried the ssh connections through WiFi.
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So please gather this information (at least for the relevant connections):
$ netstat -pn $ cat /proc/net/tcp
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I used a script which logged both every 15 seconds on both sides (in "screen" on server side). I then triggered a hang with several "seq 1 100" in the ssh session. The logs are in the attached debug_ssh_hang.tar.gz . The hang appeared between 234327 and 234342 on the client side (so somewhere between 234324, 234339 and 234354 on the server side).
I hope it'll help.
Thanks, a quick look didn't indicate anything similar to one other report from H�kon... I'd probably need a tcpdump.
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You probably run it under X, no? Please switch beforehand to some other vt (a textual one) then (Ctrl-Alt-Fn, where n < 6) and then log in and running that command there and see if you get some output into screen there. If you see something (e.g., a sudden OOPS message or some other warning printed) when it locks up, the easiest things is to take a shot with a digicam (or write it down somewhere else) and send that shot (or those details) to us please.
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I tried the following in vt1 (under the new 2.6.26-rc6 with kdm stopped):
# tcpdump -i wlan0 -w /tmp/tcpdump.wlan0and I got the attached "soft lockup".
Thanks, I guess the folks at linux-wireless can continue in resolving this one with you (I'm out of time anyway now).
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...Once you have a tcpdump, I can probably figure at least something out (though it might still just point to the right direction rather than exposing the actual cause).
I can't get one... :)
...Ok.
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A message that is not in the archive (sent off-list or not yet received): Pine.LNX.4.64.0806180152410.32420-x/[email protected]
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http://bugzilla.kernel.org/show_bug.cgi?id=10903
Summary: ssh connections hang with 2.6.26-rc5
Andrew Prince reported a similar problem and said he bisected it to davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use skb_header_cloned() on TX path.") which made no sense to me so I marked the report as 'to investigate when I have more time'.
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You probably run it under X, no? Please switch beforehand to some other vt (a textual one) then (Ctrl-Alt-Fn, where n < 6) and then log in and running that command there and see if you get some output into screen there. If you see something (e.g., a sudden OOPS message or some other warning printed) when it locks up, the easiest things is to take a shot with a digicam (or write it down somewhere else) and send that shot (or those details) to us please.
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I tried the following in vt1 (under the new 2.6.26-rc6 with kdm stopped):
# tcpdump -i wlan0 -w /tmp/tcpdump.wlan0and I got the attached "soft lockup".
Attached where? I can't find it in the bug either.
johannes
David Miller
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A message that is not in the archive (sent off-list or not yet received): 20080618.010528.05757230.davem-fT/PcQaiUtIeIZ0/[email protected]
From: David Miller <[email protected]>
Date: Wed, 18 Jun 2008 01:05:28 -0700 (PDT)
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If we can't figure out what's going on here soon (like, in less than a day) we should revert that changeset.
Actually, I think I see how the changeset might be wrong. I think the encryption layer of mac80211 assumes it can write over the data area of the SKB it's working on, not just the headers.
Once this happens, any retransmits done by SKB will fail because the master packet data on TCP's retransmit queue is now this encrypted garbage.
After some discussion about this with Johannes on IRC, we are absolutely convinced this is exactly the problem.
I intend to send the following revert to Linus tonight so we can close this:
--------------------
Revert "mac80211: Use skb_header_cloned() on TX path."
This reverts commit 608961a5eca8d3c6bd07172febc27b5559408c5d.
The problem is that the mac80211 stack not only needs to be able to muck with the link-level headers, it also might need to mangle all of the packet data if doing sw wireless encryption.
This fixes kernel bugzilla #10903. Thanks to Didier Raboud (for the bugzilla report), Andrew Prince (for bisecting), Johannes Berg (for bringing this bisection analysis to my attention), and Ilpo (for trying to analyze this purely from the TCP side).
In 2.6.27 we can take another stab at this, by using something like skb_cow_data() when the TX path of mac80211 ends up with a non-NULL tx->key. The ESP protocol code in the IPSEC stack can be used as a model for implementation.
--- net/mac80211/tx.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
net/mac80211/tx.c +2 -2
@@ -1562,13 +1562,13 @@ int ieee80211_subif_start_xmit(struct sk_buff *skb,* be cloned. This could happen, e.g., with Linux bridge code passing * us broadcast frames. */ -if (head_need >0 ||skb_header_cloned (skb)) { +if (head_need >0 ||skb_cloned (skb)) {#if 0 printk (KERN_DEBUG "%s: need to reallocate buffer for %d bytes " "of headroom\n" , dev->name, head_need);#endif -if (skb_header_cloned (skb)) +if (skb_cloned (skb))I802_DEBUG_INC (local->tx_expand_skb_head_cloned);else I802_DEBUG_INC (local->tx_expand_skb_head);
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1.5.5.1.308.g1fbb5
A message that is not in the archive (sent off-list or not yet received): 1213773887.3803.158.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org
Le mercredi 18 juin 2008 09:24:47 Johannes Berg, vous avez écrit :
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http://bugzilla.kernel.org/show_bug.cgi?id=10903
Summary: ssh connections hang with 2.6.26-rc5
Andrew Prince reported a similar problem and said he bisected it to davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use
skb_header_cloned()on TX path.") which made no sense to me so I marked the report as 'to investigate when I have more time'.
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and I got the attached "soft lockup".
Attached where? I can't find it in the bug either.
johannes
Hi,
for unknown reasons, my mail doesn't appear in the mailing list archives and the big attachment has visibly been stripped.
You'll find the "soft lockup" there:
http://raboud.homelinux.org/~didier/kernel/tcpdump_oops.jpg
Regards,
Didier
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Didier Raboud, proud Debian user. CH-1802 Corseaux [email protected]
A message that is not in the archive (sent off-list or not yet received): 200806181334.10654.didier-efQUOpnRmEvQT0dZR+AlfA@public.gmane.org
Quoted 16 lines · On Wednesday 18 June 2008 13:34:06 Didier Raboud wrote:
Le mercredi 18 juin 2008 09:24:47 Johannes Berg, vous avez écrit :
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http://bugzilla.kernel.org/show_bug.cgi?id=10903
Summary: ssh connections hang with 2.6.26-rc5
Andrew Prince reported a similar problem and said he bisected it to davem's 608961a5eca8d3c6bd07172febc27b5559408c5d ("mac80211: Use
skb_header_cloned()on TX path.") which made no sense to me so I marked the report as 'to investigate when I have more time'.Quoted 5 lines
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and I got the attached "soft lockup".
Attached where? I can't find it in the bug either.
johannes
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Hi,
for unknown reasons, my mail doesn't appear in the mailing list archives and the big attachment has visibly been stripped.
You'll find the "soft lockup" there:
The soft lockup most likely is a followup-oops to a previous one that locked up the machine.
Can you try to reproduce and capture the screen before waiting 61 seconds for the watchdog to trigger. There should be another oops before that (you see the last two lines of it on this picture)
Signature · 5 lines
Greetings Michael. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html