Bug 847456 - BUG: unable to handle kernel NULL pointer dereference at .. tcp_finish_connect
Summary: BUG: unable to handle kernel NULL pointer dereference at .. tcp_finish_connect
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: rawhide
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-08-11 15:30 UTC by Richard W.M. Jones
Modified: 2012-08-13 15:47 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2012-08-13 13:45:26 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)
screenshot showing stack trace (1.89 MB, image/jpeg)
2012-08-11 15:43 UTC, Richard W.M. Jones 		no flags Details
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Description Richard W.M. Jones 2012-08-11 15:30:53 UTC 
Description of problem:

Kernel crashes randomly in tcp_finish_connect.

For the full stack trace, see the attached screenshot.

Version-Release number of selected component (if applicable):

kernel-3.6.0-0.rc1.git3.2.bz844485.fc19.x86_64
(kernel-3.6.0-0.rc1.git3.2 + the 4 patches mentioned in bug 844485)

How reproducible:

Twice already.

Steps to Reproduce:
1. Do stuff, crashes randomly.

This email seems relevant:
http://www.spinics.net/lists/netdev/msg207318.html
Comment 1 Richard W.M. Jones 2012-08-11 15:43:05 UTC 
Created attachment 603695 [details]
screenshot showing stack trace

tcp_finish_connect
tcp_rcv_state_process
sched_clock
native_sched_clock
tcp_v4_do_rcv
release_sock
__inet_stream_connect
trace_hardirqs_on
wake_up_bit
inet_stream_connect
inet_stream_connect
sys_connect
Comment 2 Richard W.M. Jones 2012-08-11 15:43:38 UTC 
FYI I am building and testing a kernel that contains
the patch from comment 0.
Comment 3 Richard W.M. Jones 2012-08-11 16:34:37 UTC 
The patch mentioned in the email in comment 0 does appear
to fix the problem, so far.
Comment 4 Richard W.M. Jones 2012-08-11 18:31:59 UTC 
Been running for ~2 hours without crashing, whereas before
applying the patch it ran for about 5 mins.
Comment 5 Richard W.M. Jones 2012-08-12 20:14:21 UTC 
My uptime is now just over a day:

$ uptime
 21:13:54 up 1 day,  3:47,  2 users,  load average: 0.00, 0.01, 0.05

So I think I can say that the patch works ...
Comment 6 Josh Boyer 2012-08-13 13:45:26 UTC 
That patch got sucked in through patch-3.6-rc1-git5.xz today.  Should be fixed in tomorrow's f18/rawhide.

Thanks for the report.
Comment 7 Mads Kiilerich 2012-08-13 15:47:45 UTC 
I confirm that 3.6.0-0.rc1.git5.1.fc18.x86_64 is substantially better in this area.
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