Le 02.06.2006 00:56, Laurent Riffard a écrit :
> Le 02.06.2006 00:02, Andrew Morton a écrit :
[snip]
>> Laurent, please disable CONFIG_STACK_UNWIND and try again - that way we
>> should be able to see whereabouts the thread-info got corrupted.
> 
> I tried  with CONFIG_STACK_UNWIND disabled today and the bug 
> still happened.
> 
> But I can't get a full stack trace right now since I don't have my second 
> box here. Will do tomorrow.

OK, here is a new report done with 2.6.17-rc5-mm2 + hotfixes (namely 
genirq-msi-fixes-2.patch, lock-validator-x86_64-irqflags-trace-entrys-fix.patch,
revert-git-cfq.patch).

linux-2.6-mm$ grep UNWIND .config
CONFIG_UNWIND_INFO=y
# CONFIG_STACK_UNWIND is not set

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cdrom: This disc doesn't have any tracks I recognize!
pktcdvd: writer pktcdvd0 mapped to hdc
BUG: unable to handle kernel NULL pointer dereference at virtual address 00000084
 printing eip:
c01118e5
*pde = 00000000
Oops: 0000 [#1]
last sysfs file: /block/pktcdvd0/removable
Modules linked in: pktcdvd snd_pcm_oss snd_mixer_oss snd_ens1371 gameport snd_rawmidi snd_seq_device snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd_page_alloc snd soundcore lp parport_pc parport af_packet ide_cd cdrom loop aes dm_crypt nls_iso8859_1 nls_cp850 vfat fat reiserfs via_agp agpgart video ohci1394 joydev ieee1394 usbhid uhci_hcd usbcore dm_mirror dm_mod via82cxxx
CPU:    0
EIP:    0060:[<c01118e5>]    Not tainted VLI
EFLAGS: 00010006   (2.6.17-rc5-mm2 #16)
EIP is at do_page_fault+0xb4/0x5bc
eax: de67f040   ebx: de67f000   ecx: 0000007b   edx: 00000000
esi: de692000   edi: c0111831   ebp: de67f038   esp: de67f000
ds: 007b   es: 007b   ss: 0068
Process pktcdvd0 (pid: 2236, threadinfo=de67e000 task=df2e4b40)
Stack:
Call Trace:
 =======================
 =======================
BUG: unable to handle kernel paging request at virtual address 00001034
 printing eip:
c01037d0
*pde = 00000000
Oops: 0000 [#2]
last sysfs file: /block/pktcdvd0/removable
Modules linked in: pktcdvd snd_pcm_oss snd_mixer_oss snd_ens1371 gameport snd_rawmidi snd_seq_device snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd_page_alloc snd soundcore lp parport_pc parport af_packet ide_cd cdrom loop aes dm_crypt nls_iso8859_1 nls_cp850 vfat fat reiserfs via_agp agpgart video ohci1394 joydev ieee1394 usbhid uhci_hcd usbcore dm_mirror dm_mod via82cxxx
CPU:    0
EIP:    0060:[<c01037d0>]    Not tainted VLI
EFLAGS: 00010096   (2.6.17-rc5-mm2 #16)
EIP is at show_trace_log_lvl+0x7d/0x9f
eax: 00001ffd   ebx: 00001000   ecx: c0116a3c   edx: df2e4b40
esi: de67ef00   edi: 00001000   ebp: de67ef00   esp: de67eef4
ds: 007b   es: 007b   ss: 0068
Process pktcdvd0 (pid: 2236, threadinfo=de67e000 task=df2e4b40)
Stack: de67f003 00000000 00000000 de67ef28 c010387c c02a7a59 c02a7923 c02a7a59
       de67efcc de67f000 00000003 00010006 de67efcc de67ef50 c01039e4 c02a7a59
       c02a7a4d 00000001 de67f000 0068ef84 00000084 de67efcc c02ac65c de67ef84
Call Trace:
 [<c010387c>] show_stack_log_lvl+0x8a/0x95
 [<c01039e4>] show_registers+0x121/0x18e
 [<c0103ba7>] die+0x156/0x266
 [<c0111cb7>] do_page_fault+0x486/0x5bc
 [<c010340d>] error_code+0x39/0x40
 [<c010387c>] show_stack_log_lvl+0x8a/0x95
 [<c01039e4>] show_registers+0x121/0x18e
 [<c0103ba7>] die+0x156/0x266
 [<c0111cb7>] do_page_fault+0x486/0x5bc
 [<c010340d>] error_code+0x39/0x40
Code: 7a 2a c0 e8 6f 38 01 00 89 da b8 30 e0 2a c0 e8 60 03 03 00 68 d2 da 2a c0 e8 59 38 01 00 8b 06 83 c4 10 39 c6 74 04 89 c6 eb b9 <8b> 4f 34 85 c9 74 13 ff 75 08 89 cb 68 f5 78 2a c0 e8 36 38 01
EIP: [<c01037d0>] show_trace_log_lvl+0x7d/0x9f SS:ESP 0068:de67eef4
 <1>BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
[trimmed following BUGs]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(full dmesg attached below)

This BUG is triggered by starting pktcdvd service, which basically do 
"modprobe pktcdvd" and "pktsetup dvd /dev/dvd".  

The scenario was:
- boot to runlevel 2
- umount reiser4 FS and rmmod reiser4 (just in case...) 
- sync
- service pktcdvd start

~~
laurent