Bug 49491 - NULL pointer dereference in page_waitqueue during FireWire I/O
Summary: NULL pointer dereference in page_waitqueue during FireWire I/O
Status: RESOLVED UNREPRODUCIBLE
Alias: None
Product: Drivers
Classification: Unclassified
Component: IEEE1394 (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_ieee1394
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2012-10-24 21:50 UTC by Stefan Richter
Modified: 2012-10-25 19:53 UTC (History)
0 users

See Also:
Kernel Version: 3.2.0-26-generic (Ubuntu 12.04)
Subsystem:
Regression: No
Bisected commit-id:

Attachments
panic screenshot 1 (373.39 KB, image/jpeg)
2012-10-24 21:55 UTC, Stefan Richter 		Details
panic screenshot 2 (302.67 KB, image/jpeg)
2012-10-24 21:56 UTC, Stefan Richter 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Stefan Richter 2012-10-24 21:50:29 UTC 
Reported in a thread with subject: "diag" on linux1394-user (http://marc.info/?t=135092061600002):  After about a minute of I/O by a FireWire hardware testing tool called fwdiag which performs asynchronous traffic between two OHCI-1394 controllers (https://gitorious.org/~eviljoel/cfk_misc/fwdiag-cleanup/), a NULL pointer dereference occurred.

pointer: 0000000000000690
in page_waitqueue+06e/0x90
call trace:
unlock_page+0x1d/0x40
filemap_fault+0x3ba/0x3e0
__do_fault+0x72/0x550
? rb_insert_color+0x110/0x150
handle_pte_fault+0xfa0x200
? cpumask_any_but+0x2d/0x40
handle_mm_fault+0x1f8/0x350
do_page_fault+0x150/0x520
? mprotect_fixup+0x17d/0x2b0
? sys_mprotect+0x1f0/0x250
page_fault+0x25/0x30
Comment 1 Stefan Richter 2012-10-24 21:55:53 UTC 
Created attachment 84731 [details]
panic screenshot 1
Comment 2 Stefan Richter 2012-10-24 21:56:38 UTC 
Created attachment 84741 [details]
panic screenshot 2
Comment 3 Stefan Richter 2012-10-25 19:53:18 UTC 
Happened once on the reporter's machine and hasn't been reproduced by him or by the fwdiag developer.
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