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New: VNC access to KVM VM is unusable

Bug 37262 Applied [email protected] 3 participants 50 messages Jun 11, 2011 – Jun 19, 2011

Subsystems (3)
x86 KVM KVM x86
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#0 lore raw

https://bugzilla.kernel.org/show_bug.cgi?id=37262

Summary: VNC access to KVM VM is unusable
Product: Virtualization
Version: unspecified
Kernel Version: 3.0.0-rc1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: kvm
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No

Kernels: 2.6.39-git8 - 3.0.0-rc1
QemuKVM: latest from git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git

After try access to VNC console of KVM VM keyboard and video interactions is not proceed by VM. Newly created VM without OS which started for installation process of any OS dropped interactions after few inputs from user, host and hosted machine running without problems. I have tested this on 3 independent servers, 3 independent workstations.

Used VNC clients:
- from Linux: TightVNC Viewer version 1.3.10
- from Windows: RealVNC Viewer 4.1.3

Other activities except VNC access are OK.

Kernel: 2.6.39-rc1-git2
QemuKVM: latest from git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git

On this server VNC access to all KVM VM works well.

Please try to test VNC access to KVM VM and fix issue when problem occurs. As
I can see some fixes for input and tty are in kernel 3.0.0-rc2.

Thank you for your time.

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#1 lore raw

[Bug 37262] VNC access to KVM VM is unusable

https://bugzilla.kernel.org/show_bug.cgi?id=37262

Avi Kivity <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #1 from Avi Kivity <[email protected]> 2011-06-12 11:50:14 --- Does SDL work correctly?

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#2 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #2 from Steve <[email protected]> 2011-06-12 13:24:24 --- I also test qemu-kvm compiled with SDL, VM work
correctly, but VNC access occur the same result.

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#3 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #3 from Avi Kivity <[email protected]> 2011-06-12 13:42:48 ---

Quoted 2 lines · On 06/12/2011 04:24 PM, [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=37262

Please post a tcpdump of the vnc session.

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#4 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #4 from Steve <[email protected]> 2011-06-12 13:54:51 --- I checked tcpdump output, it seems that
communication is not quite correct.
Should I need use some options for
tcpdump output for you (like -vvv) ?

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#5 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #5 from Avi Kivity <[email protected]> 2011-06-12 13:57:45 ---

Quoted 6 lines · On 06/12/2011 04:54 PM, [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=37262

Quoted 6 lines

--- Comment #4 from Steve<[email protected]> 2011-06-12 13:54:51 ---
I checked tcpdump output, it seems that communication is not quite correct. Should I need use some options for tcpdump output for you (like -vvv) ?

What do you mean by "not quite correct"?

Please post the entire binary dump (with -s 2000 -w /tmp/dump port 5901). Just don't type any passwords.

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#6 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #6 from Steve <[email protected]> 2011-06-12 14:41:56 --- Created an attachment (id=61662)
--> (https://bugzilla.kernel.org/attachment.cgi?id=61662)
tcpdump output

tcpdump outputs from client & server

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#8 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #8 from Avi Kivity <[email protected]> 2011-06-12 14:58:02 --- Everything seems normal. The client sends an update request, gets an update 30ms later.

What is slow? interactivity or just display? Try watching a movie in a small window (so no keyboard/mouse is involved).

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#9 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #9 from Avi Kivity <[email protected]> 2011-06-12 15:00:21 --- Oh, the connection just drops without a user request? and qemu stays up?

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#10 lore raw

[Bug 37262] VNC access to KVM VM is unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #10 from Steve <[email protected]> 2011-06-12 15:39:05 --- VM stay up without any problem, only VNC access "freeze".
User need to close VNC client create new VNC connection
from client and see video output but keyoard & video
interaction simultaneously.

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#12 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #12 from Steve <[email protected]> 2011-06-12 15:53:59 --- I try to watch movie, video output of VNC
also freeze, but VM is not affected by this.

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#13 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #13 from Avi Kivity <[email protected]> 2011-06-12 15:55:30 --- Right. There's a client update request at frame 188 which has no responses except TCP ACKs.

Is it possible for you to do a bisect? It looks like a very basic bug here.

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#15 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #15 from Steve <[email protected]> 2011-06-12 16:11:01 --- When it's ok I can send authentication directly to your email.

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#17 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #17 from Steve <[email protected]> 2011-06-12 16:23:03 --- Could you write me what & how to do please, thanks.
Currently I have to go away, then I will be continue
with some information from you.

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#18 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #18 from Avi Kivity <[email protected]> 2011-06-12 17:01:51 --- Bisect instructions:

install git

$ git clone 
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
$ cd linux-2.6
$ cp /path/to/.config .config
# if you don't have a specialized .config already:
$ make localmodconfig
$ git bisect start v2.6.39 v2.3.39-rc1
$ make -j20 && sudo make modules_install install

[reboot to new kernel]
[test]

If it works okay:

   $ git bisect good

otherwise:

   $ git bisect bad

if git says there is work to do:

[goto 'make' step]

otherwise:

post the message that says: xxxxxxxxxxxx is first bad commit

Note: please test v2.6.39 and v2.6.39-rc1 first, to be sure they're bad and good, respectively. You can do that using

   $ git checkout v2.6.39
   $ make -j20 && sudo make modules_install install
   [reboot and test]
   $ git checkout v2.6.39-rc1
   $ make -j20 && sudo make modules_install install
   [reboot and test]

Note2: if the problem also occurs when qemu-kvm is running in a guest, you can run all of the tests in a guest, which should be a more pleasant experience.

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#19 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #19 from Steve <[email protected]> 2011-06-12 19:30:11 --- Ok. Thanks for instructions.
I will make some tests and then I will inform you about the results.

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#20 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #20 from Steve <[email protected]> 2011-06-12 22:19:51 --- I tested this kernel tags from branch
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git:
v3.0-rc2: same problem
v2.6.39-rc1: same problem
v2.6.39: same problem
v2.6.38: no problem; works as expected

Now i will try to test tags between v2.6.38 =< . < v2.6.39 and found lastest kernel version which works fine.

In every test i proceed:
1) before compilation for tested kernel
make mrproper
cp path/.config kernel_path/
make menuconfig
make -j34 && make modules_install install
2) recompile udev from master branch
git://git.kernel.org/pub/scm/linux/hotplug/udev.git
3) recompile qemu-kvm from master branch
git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git
4) reboot machine to prepared kernel
5) run KVM VM & test VNC access from more locations & VNC clients

I will inform you about my tests.

Thanks for your help.

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#21 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #21 from Steve <[email protected]> 2011-06-12 22:46:08 --- Latest tested kernel tag worked without VNC problem: 2.6.38-rc8.

Please fix reported VNC bug.

Thank you for your time.

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#22 lore raw

[Bug 37262] VNC access to KVM VM is unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #22 from Steve <[email protected]> 2011-06-12 22:49:19 --- Git positions:

Previous HEAD position was 61c4f2c... Linux 2.6.39 HEAD is now at 0ce790e... Linux 2.6.39-rc1

Previous HEAD position was 0ce790e... Linux 2.6.39-rc1 HEAD is now at 521cb40... Linux 2.6.38

Previous HEAD position was 521cb40... Linux 2.6.38 HEAD is now at a5abba9... Linux 2.6.38-rc8

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#23 lore raw

[Bug 37262] VNC access to KVM VM is unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #23 from Steve <[email protected]> 2011-06-12 22:58:37 --- Latest final tag of 2.6.38:

author Linus Torvalds <[email protected]>

    Tue, 15 Mar 2011 01:20:32 +0000 (18:20 -0700)
committer    Linus Torvalds <[email protected]>    
    Tue, 15 Mar 2011 01:20:32 +0000 (18:20 -0700)

commit 521cb40b0c44418a4fd36dc633f575813d59a43d
tree fec2224bffa4c1ffa38c3d60af17fd6d9be3fb0c tree | snapshot
parent 59766edc79da0583eff7d0a9e1049b0d3c5676b0 commit | diff

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#24 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #24 from Steve <[email protected]> 2011-06-12 23:22:58 --- I found this commits:

author Jeff Brown <[email protected]>

    Mon, 18 Apr 2011 17:08:02 +0000 (10:08 -0700)
committer    Dmitry Torokhov <[email protected]>    
    Mon, 18 Apr 2011 17:15:43 +0000 (10:15 -0700)

commit 80b4895aa4578e9372d76cd4063f82d0c3994d77
tree 0ac167a8b17e2550ff2d996d153ecbb59e05e643 tree | snapshot
parent 9fb0f14e31b6101a0cc69a333b43541044f9b0a6 commit | diff

author Olaf Hering <[email protected]>

    Thu, 17 Mar 2011 05:11:46 +0000 (22:11 -0700)
committer    Dmitry Torokhov <[email protected]>    
    Thu, 17 Mar 2011 06:24:02 +0000 (23:24 -0700)

commit 8c3c283e6bf463ab498d6e7823aff6c4762314b6
tree 32a5aaf486e95afc321f4c7514129b7e48b883b6 tree | snapshot
parent 53a2b81c4e659d894aadc56715c8d8a9afa60d67 commit | diff

author Jeff Brown <[email protected]>

    Wed, 13 Apr 2011 06:29:38 +0000 (23:29 -0700)
committer    Dmitry Torokhov <[email protected]>    
    Wed, 13 Apr 2011 06:35:24 +0000 (23:35 -0700)

commit 9fb0f14e31b6101a0cc69a333b43541044f9b0a6
tree a384acf387f5dff50e0c3a56fa54336dedd286c5 tree | snapshot
parent b1e064b81e238d47cb56544b34c9baf473e09837 commit | diff

author GuanXuetao <[email protected]>

    Sat, 26 Feb 2011 13:39:10 +0000 (21:39 +0800)
committer    GuanXuetao <[email protected]>    
    Thu, 17 Mar 2011 01:19:20 +0000 (09:19 +0800)

commit ce443ab5fd536941da1d529ba3963324f941fc29
tree 5551778e3ae1d623410ad98cbeefe941fc29dd28 tree | snapshot
parent d10e4a660d11212a41ac5d2c116a655e25e2d38a commit | diff

author Linus Torvalds <[email protected]>

    Thu, 7 Apr 2011 18:33:04 +0000 (11:33 -0700)
committer    Linus Torvalds <[email protected]>    
    Thu, 7 Apr 2011 18:33:04 +0000 (11:33 -0700)
commit    7bc30c23c8ace3821a6732bfbe7e8f1b0995a63e
tree    3440c323f331fb2c0b5e84c206b3c73d70826ee6    tree | snapshot
parent    ccfeef0ff76ebd632ae51bc56700f0072c4f1864    commit | diff
parent    bd22f5cfcfe8f68bf43b72daf4530cd7eedc9b7a    commit | diff
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#26 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #26 from Steve <[email protected]> 2011-06-13 08:59:11 --- I found some commit that could affect this but it's only my assumption.

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#28 lore raw

[Bug 37262] VNC access to KVM VM is unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #28 from Steve <[email protected]> 2011-06-13 09:15:33 --- I used git bitsect as you described above but
i didn't see any output, probably i did something wrong.

git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
make_kernel
reboot_to_new_kernel
git bisect start v2.6.39 v2.3.39-rc1

when booted kernel, tested VNC & problem occurs:
git bisect bad

I didn't see any output.

Should you write me where could i do mistake ?

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#29 lore raw

[Bug 37262] VNC access to KVM VM is unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #29 from Avi Kivity <[email protected]> 2011-06-13 09:22:55 --- You should run 'git bisect bad' in the directory where you have the linux-2.6 clone. git will then check out a new commit for you to test (and tell you about it).

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#30 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #30 from Avi Kivity <[email protected]> 2011-06-13 09:35:05 ---

Quoted 7 lines · On 06/13/2011 01:19 AM, [email protected] wrote:

--- Comment #20 from Steve<[email protected]> 2011-06-12 22:19:51 ---
I tested this kernel tags from branch
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git:
v3.0-rc2: same problem
v2.6.39-rc1: same problem
v2.6.39: same problem
v2.6.38: no problem; works as expected

In light of this, the bisect start command should be:

$ git bisect start v2.6.39-rc1 v2.6.38

(since the problem was introduced between 2.6.48 and 2.6.39-rc1).

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#31 lore raw

[Bug 37262] VNC access to KVM VM is unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #31 from Steve <[email protected]> 2011-06-13 09:55:41 --- Of course I did bitsect in cloned git directory but i didn't see any output.

I need to try this:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
git bisect start v2.6.39-rc1 v2.6.38
perform_make&test
git bisect bad # i could see info
git checkout v2.6.39-rc1
perform_make&test
git bisect bad # i could see info
git checkout v2.6.38
perform_make&test
git bisect good # i could see info

Am I correct ?

Thanks for your info.

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#32 lore raw

[Bug 37262] VNC access to KVM VM is unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #32 from Avi Kivity <[email protected]> 2011-06-13 12:18:56 ---

Quoted 1 line · On 06/13/2011 12:55 PM, [email protected] wrote:

Of course I did bitsect in cloned git directory but i didn't see any output.

Strange, did you follow the procedure exactly? What's the output after 'git bisect start'?

Quoted 11 lines

I need to try this:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
git bisect start v2.6.39-rc1 v2.6.38
perform_make&test
git bisect bad # i could see info
git checkout v2.6.39-rc1
perform_make&test
git bisect bad # i could see info
git checkout v2.6.38
perform_make&test
git bisect good # i could see info

No need to test v2.6.38 and v2.6.39-rc1 separately, you're already sure they're good and bad respectively, yes?

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#33 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #33 from Steve <[email protected]> 2011-06-13 14:05:34 --- (In reply to comment #32)

Quoted 5 lines · On 06/13/2011 12:55 PM, [email protected] wrote:
Quoted 1 line

Of course I did bitsect in cloned git directory but i didn't see any output.

Strange, did you follow the procedure exactly? What's the output after 'git bisect start'?

1) initial git clone
2) first run git bisect start:
no output
3) after second run (git bisect start):
Already on 'master'
4) git bisect log:
git bisect start
5) git bisect replay:
No logfile given
6) git --version:
git version 1.7.5.2.317.g391b14.dirty
7) git bisect start v2.6.39-rc1 v2.6.38:
Already on 'master'
Bisecting: 4616 revisions left to test after this (roughly 12 steps) [179198373cf374f0ef793f1023c1cdd83b53674d] Merge branch 'nfs-for-2.6.39' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
8) git bisect log:
# bad: [0ce790e7d736cedc563e1fb4e998babf5a4dbc3d] Linux 2.6.39-rc1 # good: [521cb40b0c44418a4fd36dc633f575813d59a43d] Linux 2.6.38 git bisect start 'v2.6.39-rc1' 'v2.6.38'
9) git bisect replay:
No logfile given

It seems initial git bisect start should be run first.

Quoted 13 lines
Quoted 12 lines

I need to try this:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
git bisect start v2.6.39-rc1 v2.6.38
perform_make&test
git bisect bad # i could see info
git checkout v2.6.39-rc1
perform_make&test
git bisect bad # i could see info
git checkout v2.6.38
perform_make&test
git bisect good # i could see info

Quoted 2 lines

No need to test v2.6.38 and v2.6.39-rc1 separately, you're already sure they're good and bad respectively, yes?

I need to know exactly what i do to understand it correctly, thank you for your assistance & time investments to help me. I will test it again and give you requested data.

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#34 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #34 from Avi Kivity <[email protected]> 2011-06-13 14:12:50 ---

Quoted 5 lines · On 06/13/2011 05:05 PM, [email protected] wrote:

7) git bisect start v2.6.39-rc1 v2.6.38:
Already on 'master'
Bisecting: 4616 revisions left to test after this (roughly 12 steps) [179198373cf374f0ef793f1023c1cdd83b53674d] Merge branch 'nfs-for-2.6.39' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

When you get this, build, reboot, and test. Then do 'git bisect good' or 'git bisect bad' as appropriate.

After 'git bisect good' or 'git bisect bad' you will need to build and test again, until git tells you to stop ('xxxxx is first bad commit').

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#35 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #35 from Steve <[email protected]> 2011-06-13 14:27:31 --- (In reply to comment #34)

Quoted 7 lines · On 06/13/2011 05:05 PM, [email protected] wrote:
Quoted 5 lines

7) git bisect start v2.6.39-rc1 v2.6.38:
Already on 'master'
Bisecting: 4616 revisions left to test after this (roughly 12 steps) [179198373cf374f0ef793f1023c1cdd83b53674d] Merge branch 'nfs-for-2.6.39' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

Quoted 5 lines

When you get this, build, reboot, and test. Then do 'git bisect good' or 'git bisect bad' as appropriate.

After 'git bisect good' or 'git bisect bad' you
will need to build and test again,

this was very important information for me:
rebuild it again and test without any change
after run git bisect good or bad marking

Quoted 1 line

until git tells you to stop ('xxxxx is first bad commit').

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#36 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #36 from Steve <[email protected]> 2011-06-15 17:10:04 --- git bisect log:
# bad: [0ce790e7d736cedc563e1fb4e998babf5a4dbc3d] Linux 2.6.39-rc1 # good: [521cb40b0c44418a4fd36dc633f575813d59a43d] Linux 2.6.38 git bisect start 'v2.6.39-rc1' 'v2.6.38'
# good: [179198373cf374f0ef793f1023c1cdd83b53674d] Merge branch 'nfs-for-2.6.39' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
git bisect good 179198373cf374f0ef793f1023c1cdd83b53674d
# bad: [da23ef0549d4205ca9b576cf6cce9a80d0c3e43a] adfs: add hexadecimal filetype suffix option
git bisect bad da23ef0549d4205ca9b576cf6cce9a80d0c3e43a
# bad: [e16b396ce314b2bcdfe6c173fe075bf8e3432368] Merge branch 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
git bisect bad e16b396ce314b2bcdfe6c173fe075bf8e3432368
# bad: [411f5c7a502769ccc0377c5ba36cb0b283847ba8] Merge branch 'devel-stable' of master.kernel.org:/home/rmk/linux-2.6-arm
git bisect bad 411f5c7a502769ccc0377c5ba36cb0b283847ba8
# bad: [6d7ed21d17e640b120b902a314143e5ef4917a70] Merge branches 'defcfg', 'drivers' and 'cyberpro-next' of master.kernel.org:/home/rmk/linux-2.6-arm git bisect bad 6d7ed21d17e640b120b902a314143e5ef4917a70

After this VNC access is OK.
Now it's time to mark as git bisect good
and then git tells some information.
Am I right ?

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#37 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #37 from Steve <[email protected]> 2011-06-15 17:19:44 --- I will continue with git bisect good/bad
and try to find bad commmit.

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#38 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #38 from Steve <[email protected]> 2011-06-15 21:44:37 --- I found it:

5d163b1c9d6e5562dcdfd6cd471f237f1502bb35 is the first bad commit commit 5d163b1c9d6e5562dcdfd6cd471f237f1502bb35

Author: Xiao Guangrong <[email protected]>
Date:   Wed Mar 9 15:43:00 2011 +0800

KVM: MMU: introduce a common function to get no-dirty-logged slot

Cleanup the code of pte_prefetch_gfn_to_memslot and
mapping_level_dirty_bitmap

Signed-off-by Xiao Guangrong <[email protected]>
Signed-off-by Avi Kivity <[email protected]>

:040000 040000 23f9e0cbbeba9b82067fc50ffc3fdd0c2982a206
28607b5635b3cb78048f9e270ddefde39f1ed25f M arch

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#39 lore raw

Re: [Bug 37262] VNC access to KVM VM is unusable

Quoted 16 lines · On 06/16/2011 12:44 AM, [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #38 from Steve<[email protected]> 2011-06-15 21:44:37 ---
I found it:

5d163b1c9d6e5562dcdfd6cd471f237f1502bb35 is the first bad commit commit 5d163b1c9d6e5562dcdfd6cd471f237f1502bb35

Author: Xiao Guangrong<[email protected]>
Date:   Wed Mar 9 15:43:00 2011 +0800

KVM: MMU: introduce a common function to get no-dirty-logged slot

Quoted 9 lines

Cleanup the code of pte_prefetch_gfn_to_memslot and
mapping_level_dirty_bitmap

Signed-off-by Xiao Guangrong<[email protected]>
Signed-off-by Avi Kivity<[email protected]>

:040000 040000 23f9e0cbbeba9b82067fc50ffc3fdd0c2982a206
28607b5635b3cb78048f9e270ddefde39f1ed25f M arch

Xiao? Can you take a look?

Steve, can you confirm by:

$ git bisect reset
$ git checkout 5d163b1c9d6e5562dc
[build and test, verify failure]
$ git checkout 5d163b1c9d6e5562dc^
[build and test, verify success]
Signature · 1 line
error compiling committee.c: too many arguments to function
author
#40 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #39 from Steve <[email protected]> 2011-06-15 21:46:15 --- Here is complete git bisect log:

# bad: [0ce790e7d736cedc563e1fb4e998babf5a4dbc3d] Linux 2.6.39-rc1 # good: [521cb40b0c44418a4fd36dc633f575813d59a43d] Linux 2.6.38 git bisect start 'v2.6.39-rc1' 'v2.6.38'
# good: [179198373cf374f0ef793f1023c1cdd83b53674d] Merge branch 'nfs-for-2.6.39' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
git bisect good 179198373cf374f0ef793f1023c1cdd83b53674d
# bad: [da23ef0549d4205ca9b576cf6cce9a80d0c3e43a] adfs: add hexadecimal filetype suffix option
git bisect bad da23ef0549d4205ca9b576cf6cce9a80d0c3e43a
# bad: [e16b396ce314b2bcdfe6c173fe075bf8e3432368] Merge branch 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
git bisect bad e16b396ce314b2bcdfe6c173fe075bf8e3432368
# bad: [411f5c7a502769ccc0377c5ba36cb0b283847ba8] Merge branch 'devel-stable' of master.kernel.org:/home/rmk/linux-2.6-arm
git bisect bad 411f5c7a502769ccc0377c5ba36cb0b283847ba8
# bad: [6d7ed21d17e640b120b902a314143e5ef4917a70] Merge branches 'defcfg', 'drivers' and 'cyberpro-next' of master.kernel.org:/home/rmk/linux-2.6-arm git bisect bad 6d7ed21d17e640b120b902a314143e5ef4917a70
# good: [c98a0eb0e90d1caa8a92913cd45462102cbd5eaf] [SCSI] sd: Logical Block Provisioning update
git bisect good c98a0eb0e90d1caa8a92913cd45462102cbd5eaf
# good: [804f18536984939622ddca60ab6b25743e0ec68d] Merge branch 'stable/xen.pm.bug-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
git bisect good 804f18536984939622ddca60ab6b25743e0ec68d
# good: [49b26e26e4b7b94753b39f7edb0c34f3d1c4c167] KVM: MMU: do not record gfn in kvm_mmu_pte_write
git bisect good 49b26e26e4b7b94753b39f7edb0c34f3d1c4c167
# good: [9c9585e0e96f8340d704256db00b2ec28240c36e] Merge branches 'aaci', 'mmci-dma', 'pl' and 'pl011' into drivers
git bisect good 9c9585e0e96f8340d704256db00b2ec28240c36e
# bad: [0f53b5b1c0baae4f949ac0721a55b7a2158dda01] KVM: MMU: cleanup pte write path
git bisect bad 0f53b5b1c0baae4f949ac0721a55b7a2158dda01
# good: [831ca6093ca486060721f5c3c74f97b10f3172b9] KVM: SVM: Load %gs earlier if CONFIG_X86_32_LAZY_GS=n
git bisect good 831ca6093ca486060721f5c3c74f97b10f3172b9
# good: [1aa8ceef0312a6aae7dd863a120a55f1637b361d] KVM: fix kvmclock regression due to missing clock update
git bisect good 1aa8ceef0312a6aae7dd863a120a55f1637b361d
# bad: [5d163b1c9d6e5562dcdfd6cd471f237f1502bb35] KVM: MMU: introduce a common function to get no-dirty-logged slot
git bisect bad 5d163b1c9d6e5562dcdfd6cd471f237f1502bb35
# good: [40dcaa9f69fa303ddcb5ea65baf4efefed3aec4b] KVM: fix rcu usage in init_rmode_* functions
git bisect good 40dcaa9f69fa303ddcb5ea65baf4efefed3aec4b

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#41 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #40 from Avi Kivity <[email protected]> 2011-06-16 14:00:24 ---

Quoted 16 lines · On 06/16/2011 12:44 AM, [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #38 from Steve<[email protected]> 2011-06-15 21:44:37 ---
I found it:

5d163b1c9d6e5562dcdfd6cd471f237f1502bb35 is the first bad commit commit 5d163b1c9d6e5562dcdfd6cd471f237f1502bb35

Author: Xiao Guangrong<[email protected]>
Date:   Wed Mar 9 15:43:00 2011 +0800

KVM: MMU: introduce a common function to get no-dirty-logged slot

Quoted 9 lines

Cleanup the code of pte_prefetch_gfn_to_memslot and
mapping_level_dirty_bitmap

Signed-off-by Xiao Guangrong<[email protected]>
Signed-off-by Avi Kivity<[email protected]>

:040000 040000 23f9e0cbbeba9b82067fc50ffc3fdd0c2982a206
28607b5635b3cb78048f9e270ddefde39f1ed25f M arch

Xiao? Can you take a look?

Steve, can you confirm by:

$ git bisect reset
$ git checkout 5d163b1c9d6e5562dc
[build and test, verify failure]
$ git checkout 5d163b1c9d6e5562dc^
[build and test, verify success]
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#42 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #41 from Steve <[email protected]> 2011-06-16 14:15:09 --- (In reply to comment #40)

Quoted 29 lines · On 06/16/2011 12:44 AM, [email protected] wrote:
Quoted 16 lines

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #38 from Steve<[email protected]> 2011-06-15 21:44:37 ---
I found it:

5d163b1c9d6e5562dcdfd6cd471f237f1502bb35 is the first bad commit commit 5d163b1c9d6e5562dcdfd6cd471f237f1502bb35

Author: Xiao Guangrong<[email protected]>
Date:   Wed Mar 9 15:43:00 2011 +0800

KVM: MMU: introduce a common function to get no-dirty-logged slot

Quoted 9 lines

Cleanup the code of pte_prefetch_gfn_to_memslot and
mapping_level_dirty_bitmap

Signed-off-by Xiao Guangrong<[email protected]>
Signed-off-by Avi Kivity<[email protected]>

:040000 040000 23f9e0cbbeba9b82067fc50ffc3fdd0c2982a206
28607b5635b3cb78048f9e270ddefde39f1ed25f M arch

Xiao? Can you take a look?

Quoted 7 lines

Steve, can you confirm by:

$ git bisect reset
$ git checkout 5d163b1c9d6e5562dc
[build and test, verify failure]
$ git checkout 5d163b1c9d6e5562dc^
[build and test, verify success]

Ok, I will try it tonight and then give you report.

Thank you for your time.

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#43 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #42 from Steve <[email protected]> 2011-06-16 16:45:46 --- (In reply to comment #41)

Quoted 35 lines

(In reply to comment #40)

Quoted 34 lines · On 06/16/2011 12:44 AM, [email protected] wrote:
Quoted 16 lines

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #38 from Steve<[email protected]> 2011-06-15 21:44:37 ---
I found it:

5d163b1c9d6e5562dcdfd6cd471f237f1502bb35 is the first bad commit commit 5d163b1c9d6e5562dcdfd6cd471f237f1502bb35

Author: Xiao Guangrong<[email protected]>
Date:   Wed Mar 9 15:43:00 2011 +0800

KVM: MMU: introduce a common function to get no-dirty-logged slot

Quoted 9 lines

Cleanup the code of pte_prefetch_gfn_to_memslot and
mapping_level_dirty_bitmap

Signed-off-by Xiao Guangrong<[email protected]>
Signed-off-by Avi Kivity<[email protected]>

:040000 040000 23f9e0cbbeba9b82067fc50ffc3fdd0c2982a206
28607b5635b3cb78048f9e270ddefde39f1ed25f M arch

Xiao? Can you take a look?

Steve, can you confirm by:

$ git bisect reset
$ git checkout 5d163b1c9d6e5562dc
[build and test, verify failure]

i can confirm: test failed

Quoted 2 lines
Quoted 2 lines
$ git checkout 5d163b1c9d6e5562dc^
[build and test, verify success]

i can confirm: test was successful

Quoted 4 lines

Ok, I will try it tonight and then give you report.

Thank you for your time.

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#44 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #43 from Steve <[email protected]> 2011-06-16 20:39:32 --- Solution of this bug is very simple:

arch/x86/kvm/mmu.c:

static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn) {
return (gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true) == NULL) ? true : false;
}

Only opposite condition.
Please commit when it's possible.

Thank you for your time

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#45 lore raw

Re: [Bug 37262] VNC access to KVM VM is unusable

Quoted 11 lines · On 06/17/2011 04:39 AM, [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #43 from Steve <[email protected]> 2011-06-16 20:39:32 --- Solution of this bug is very simple:

arch/x86/kvm/mmu.c:

Quoted 9 lines

static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn) {
return (gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true) == NULL) ? true : false;
}

Only opposite condition.
Please commit when it's possible.

Yes, it is the reason, thanks for your time and great job, i am so sorry, this is caused by my mistake :-(

And this is the fix patch from you and i did little cleanup

From: Steve <[email protected]>
Subject: [PATCH] KVM: MMU: fix opposite condition in mapping_level_dirty_bitmap

The condition is opposite, it always maps huge page for the dirty tracked page

Reported-by Steve <[email protected]>
Signed-off-by Steve <[email protected]>
---
 arch/x86/kvm/mmu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
arch/x86/kvm/mmu.c +1 -1
index 19ebb76..15afa1e 100644
@@ -549,7 +549,7 @@ gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn,
 
 static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn)
 {
-	return gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true);
+	return !gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true);
 }
 
 static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
Signature · 1 line
1.7.5.4
Applied
#46 lore raw

Re: [Bug 37262] VNC access to KVM VM is unusable

Quoted 5 lines · Xiao Guangrong

From: Steve<[email protected]>
Subject: [PATCH] KVM: MMU: fix opposite condition in mapping_level_dirty_bitmap

The condition is opposite, it always maps huge page for the dirty tracked page

Thanks, applied and queued.

Signature · 1 line
error compiling committee.c: too many arguments to function
author
#47 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #44 from Anonymous Emailer <[email protected]> 2011-06-17 03:49:38 ---
Reply-To: [email protected]

Quoted 11 lines · On 06/17/2011 04:39 AM, [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #43 from Steve <[email protected]> 2011-06-16 20:39:32 --- Solution of this bug is very simple:

arch/x86/kvm/mmu.c:

Quoted 9 lines

static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn) {
return (gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true) == NULL) ? true : false;
}

Only opposite condition.
Please commit when it's possible.

Yes, it is the reason, thanks for your time and great job, i am so sorry, this is caused by my mistake :-(

And this is the fix patch from you and i did little cleanup

From: Steve <[email protected]>
Subject: [PATCH] KVM: MMU: fix opposite condition in mapping_level_dirty_bitmap

The condition is opposite, it always maps huge page for the dirty tracked page

Reported-by Steve <[email protected]>
Signed-off-by Steve <[email protected]>
---
 arch/x86/kvm/mmu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
arch/x86/kvm/mmu.c +0 -0
index 19ebb76..15afa1e 100644
@@ -549,7 +549,7 @@ gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t

gfn,

static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn) {
- return gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true);
+ return !gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true);
}

static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)

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#48 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

Steve <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
         Resolution|                            |CODE_FIX

--- Comment #45 from Steve <[email protected]> 2011-06-17 07:00:16 --- I prefer unabridged syntax in specific
situation, reduction has the same result.
Now VNC access works as expected.

Thank you for your time.

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author Applied
#49 lore raw

[Bug 37262] VNC access to KVM VM is unusable

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=37262

--- Comment #46 from Avi Kivity <[email protected]> 2011-06-19 08:50:13 ---

Quoted 5 lines · Xiao Guangrong

From: Steve<[email protected]>
Subject: [PATCH] KVM: MMU: fix opposite condition in mapping_level_dirty_bitmap

The condition is opposite, it always maps huge page for the dirty tracked page

Thanks, applied and queued.

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