New: Kernel panic - not syncing: Fatal Exception

Bugme-new Andrew Morton 3 participants 6 messages Dec 8, 2010 – Dec 9, 2010 1 message not in the archive

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Andrew Morton

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2010-12-08 20:23 UTC #1 lore raw

In reply to a message not in the archive

(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).

Quoted 18 lines · On Wed, 8 Dec 2010 20:14:45 GMT [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=24472

           Summary: Kernel panic - not syncing: Fatal Exception
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.36.1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Network
        AssignedTo: [email protected]
        ReportedBy: [email protected]
        Regression: No

Quoted 10 lines

Created an attachment (id=39332)
--> (https://bugzilla.kernel.org/attachment.cgi?id=39332)
Kernel Panic
Hello i have problems with ppp driver and pppoe
I have random kernel panics
In attached image is Call Trace from panic.

ppp_unregister_channel() appears to be using a bad pointer.

Paweł Staszewski

2010-12-08 20:37 UTC #2 lore raw

W dniu 2010-12-08 21:22, Andrew Morton pisze:

Quoted 28 lines

(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
Quoted 22 lines · On Wed, 8 Dec 2010 20:14:45 GMT [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=24472
            Summary: Kernel panic - not syncing: Fatal Exception
            Product: Drivers
            Version: 2.5
     Kernel Version: 2.6.36.1
           Platform: All
         OS/Version: Linux
               Tree: Mainline
             Status: NEW
           Severity: normal
           Priority: P1
          Component: Network
         AssignedTo: [email protected]
         ReportedBy: [email protected]
         Regression: No
Created an attachment (id=39332)
--> (https://bugzilla.kernel.org/attachment.cgi?id=39332)
Kernel Panic

Quoted 8 lines

Quoted 6 lines
Hello i have problems with ppp driver and pppoe
I have random kernel panics
In attached image is Call Trace from panic.
ppp_unregister_channel() appears to be using a bad pointer. --

Yes.
I see kernel panics when connection is terminated - but this happend randomly Sometimes to reproduce i need to connect->disconnect 50 - 60 times before kernel panic.

Quoted 5 lines

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Jarek Poplawski

2010-12-08 22:01 UTC #3 lore raw

Quoted 13 lines · Paweł Staszewski

W dniu 2010-12-08 21:22, Andrew Morton pisze:
Quoted 12 lines
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
Quoted 6 lines · On Wed, 8 Dec 2010 20:14:45 GMT [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=24472
            Summary: Kernel panic - not syncing: Fatal Exception
            Product: Drivers
            Version: 2.5
     Kernel Version: 2.6.36.1

Hi,
Could you try to revert this patch?:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.36.y.git;a=commitdiff;h=55c95e738da85373965cb03b4f975d0fd559865b

Jarek P.

Paweł Staszewski

2010-12-09 12:40 UTC #4 lore raw

W dniu 2010-12-08 23:01, Jarek Poplawski pisze:

Quoted 10 lines

Quoted 9 lines · Paweł Staszewski
W dniu 2010-12-08 21:22, Andrew Morton pisze:
Quoted 8 lines
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
Quoted 2 lines · On Wed, 8 Dec 2010 20:14:45 GMT [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=24472

Quoted 8 lines

Quoted 4 lines
Quoted 4 lines
Quoted 4 lines
             Summary: Kernel panic - not syncing: Fatal Exception
             Product: Drivers
             Version: 2.5
      Kernel Version: 2.6.36.1
Hi,
Could you try to revert this patch?:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.36.y.git;a=commitdiff;h=55c95e738da85373965cb03b4f975d0fd559865b

After reverting this patch all is working
200 connects-disconnects and no kernel panic

I will make more session and test more.

Thanks
Pawel

Quoted 7 lines

Jarek P.
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Jarek Poplawski

2010-12-09 17:55 UTC #5 lore raw

Quoted 21 lines · Paweł Staszewski

W dniu 2010-12-08 23:01, Jarek Poplawski pisze:
Quoted 11 lines
Quoted 10 lines · Paweł Staszewski
W dniu 2010-12-08 21:22, Andrew Morton pisze:
Quoted 9 lines
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
Quoted 2 lines · On Wed, 8 Dec 2010 20:14:45 GMT [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=24472
Quoted 9 lines
Quoted 4 lines
Quoted 4 lines
Quoted 4 lines
             Summary: Kernel panic - not syncing: Fatal Exception
             Product: Drivers
             Version: 2.5
      Kernel Version: 2.6.36.1
Hi,
Could you try to revert this patch?:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.36.y.git;a=commitdiff;h=55c95e738da85373965cb03b4f975d0fd559865b

Quoted 4 lines

After reverting this patch all is working
200 connects-disconnects and no kernel panic
I will make more session and test more.

OK. I CC Andrej and Eric, who diagnosed it in this thread:
http://lkml.org/lkml/2010/12/3/116
[unable to handle kernel NULL pointer dereference in skb_dequeue]

This should be also interesting:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=db7bf6d97c6956b7eb0f22131cb5c37bd41f33c0

Thanks for testing,
Jarek P.

Paweł Staszewski

2010-12-09 19:59 UTC #6 lore raw

W dniu 2010-12-09 18:55, Jarek Poplawski pisze:

Quoted 30 lines

Quoted 21 lines · Paweł Staszewski
W dniu 2010-12-08 23:01, Jarek Poplawski pisze:
Quoted 11 lines
Quoted 10 lines · Paweł Staszewski
W dniu 2010-12-08 21:22, Andrew Morton pisze:
Quoted 9 lines
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
Quoted 2 lines · On Wed, 8 Dec 2010 20:14:45 GMT [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=24472
Quoted 9 lines
Quoted 4 lines
Quoted 4 lines
Quoted 4 lines
              Summary: Kernel panic - not syncing: Fatal Exception
              Product: Drivers
              Version: 2.5
       Kernel Version: 2.6.36.1
Hi,
Could you try to revert this patch?:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.36.y.git;a=commitdiff;h=55c95e738da85373965cb03b4f975d0fd559865b
Quoted 4 lines
After reverting this patch all is working
200 connects-disconnects and no kernel panic
I will make more session and test more.
OK. I CC Andrej and Eric, who diagnosed it in this thread:
http://lkml.org/lkml/2010/12/3/116
[unable to handle kernel NULL pointer dereference in skb_dequeue]

Quoted 7 lines

This should be also interesting:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=db7bf6d97c6956b7eb0f22131cb5c37bd41f33c0
Thanks for testing,
Jarek P.

After 10 hours of testing all is working.

I can't reproduce kernel panic now with houndreds of pppoe sessions that connects-disconnects.

Thanks
Paweł