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SubjectALSA oops with OSS emulation; 2.6.7 and 2.6.8-rc3
From
  I have managed to reproduce an oops with the following steps:

* Play some old Sierra game inside FreeSCI for a few hours
* Quit FreeSCI

It's irrelevant which audio driver is used for FreeSCI, as the oops
happens with null driver as well.

Pre-empt is off. IO-APIC is off. ACPI is off. 4k stacks is off.
Difference between kernel configurations is minimal: only the new AES
option was selected in 2.6.8-rc3 in addition to those in 2.6.7. Sound
card, according to lspci -vvv:

0000:00:0b.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10)
Subsystem: C-Media Electronics Inc CMI8738/C3DX PCI Audio Device
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping+ SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (500ns min, 6000ns max)
Interrupt: pin A routed to IRQ 3
Region 0: I/O ports at b800 [size=256]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
In each case the following modules were loaded:
radeon sd_mod 8250 serial_core ehci_hcd uhci_hcd usbcore dm_mod it87
eeprom i2c_sensor i2c_isa i2c_viapro i2c_core via_agp agpgart ip_tables
isofs ide_cd sg scsi_mod snd_cmipci snd_pcm_oss snd_mixer_oss snd_pcm
snd_page_alloc snd_opl3_lib snd_timer snd_hwdep snd_mpu401_uart
snd_rawmidi snd_seq_device snd soundcore 3c59x parport_pc lp parport apm
cdrom rtc

Relevant lines from .configs:

CONFIG_SND_CMIPCI=m
CONFIG_SND=m
CONFIG_SND_TIMER=m
CONFIG_SND_PCM=m
CONFIG_SND_HWDEP=m
CONFIG_SND_RAWMIDI=m
CONFIG_SND_SEQUENCER=m
CONFIG_SND_SEQ_DUMMY=m
CONFIG_SND_OSSEMUL=y
CONFIG_SND_MIXER_OSS=m
CONFIG_SND_PCM_OSS=m
CONFIG_SND_SEQUENCER_OSS=y
CONFIG_SND_RTCTIMER=m
CONFIG_SND_VERBOSE_PRINTK=y
# CONFIG_SND_DEBUG is not set
CONFIG_SND_MPU401_UART=m
CONFIG_SND_OPL3_LIB=m
CONFIG_SND_DUMMY=m
CONFIG_SND_VIRMIDI=m
# CONFIG_SND_MTPAV is not set
# CONFIG_SND_SERIAL_U16550 is not set
CONFIG_SND_MPU401=m

Any more info I should provide? I'm willing to try if there's a patch to
fix this.

Below are three ksymoops-processed messages. First was 2.6.7 with
normal audio driver (defaults to OSS). Second was 2.6.7 with null audio
driver. Third was 2.6.8-rc3 with null audio driver. Normal ksymoops
whines about not specifying files are omitted.

[-- Number 1]
ksymoops 2.4.9 on i686 2.6.7. Options used
[...]
Error (regular_file): read_ksyms stat /proc/ksyms failed
No modules in ksyms, skipping objects
No ksyms, skipping lsmod
Unable to handle kernel NULL pointer dereference at virtual address 00000d80
c029c489
*pde = 00000000
Oops: 0002 [#1]
CPU: 0
EIP: 0060:[<c029c489>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246 (2.6.7)
eax: 00000000 ebx: 00001000 ecx: 00001000 edx: 0819d7f0
esi: 0819c7f0 edi: 00000d80 ebp: c158cde0 esp: d7ae4e78
ds: 007b es: 007b ss: 0068
Stack: 00000000 00001000 00001350 927335c3 000d498a 00000000 00000d80 c01f9482
00000d80 0819c7f0 00001000 00001000 e0913360 df88f000 e0901896 00000d80
0819c7f0 00001000 c011ab90 c59d3470 11486360 00000400 00002000 df88f000
Call Trace:
[<c01f9482>] copy_from_user+0x42/0x80
[<e0901896>] snd_pcm_lib_write_transfer+0x96/0xb0 [snd_pcm]
[<c011ab90>] process_timeout+0x0/0x10
[<e0901afe>] snd_pcm_lib_write1+0x24e/0x3e0 [snd_pcm]
[<c0110ab0>] default_wake_function+0x0/0x20
[<e0901d17>] snd_pcm_lib_write+0x87/0xa0 [snd_pcm]
[<e0901800>] snd_pcm_lib_write_transfer+0x0/0xb0 [snd_pcm]
[<e08fcd6a>] snd_pcm_playback_ioctl1+0x29a/0x300 [snd_pcm]
[<c0154315>] sys_ioctl+0xd5/0x240
[<c0103d69>] sysenter_past_esp+0x52/0x71
Code: f3 aa 58 59 e9 38 cf f5 ff b8 f2 ff ff ff e9 3d 1b f6 ff b8

>>EIP; c029c489 <__sched_text_end+a31/ef2> <=====

>>ebp; c158cde0 <pg0+120cde0/3fc7e000>
>>esp; d7ae4e78 <pg0+17764e78/3fc7e000>

Trace; c01f9482 <copy_from_user+42/80>
Trace; e0901896 <pg0+20581896/3fc7e000>
Trace; c011ab90 <process_timeout+0/10>
Trace; e0901afe <pg0+20581afe/3fc7e000>
Trace; c0110ab0 <default_wake_function+0/20>
Trace; e0901d17 <pg0+20581d17/3fc7e000>
Trace; e0901800 <pg0+20581800/3fc7e000>
Trace; e08fcd6a <pg0+2057cd6a/3fc7e000>
Trace; c0154315 <sys_ioctl+d5/240>
Trace; c0103d69 <sysenter_past_esp+52/71>

Code; c029c489 <__sched_text_end+a31/ef2>
00000000 <_EIP>:
Code; c029c489 <__sched_text_end+a31/ef2> <=====
0: f3 aa repz stos %al,%es:(%edi) <=====
Code; c029c48b <__sched_text_end+a33/ef2>
2: 58 pop %eax
Code; c029c48c <__sched_text_end+a34/ef2>
3: 59 pop %ecx
Code; c029c48d <__sched_text_end+a35/ef2>
4: e9 38 cf f5 ff jmp fff5cf41 <_EIP+0xfff5cf41>
Code; c029c492 <__sched_text_end+a3a/ef2>
9: b8 f2 ff ff ff mov $0xfffffff2,%eax
Code; c029c497 <__sched_text_end+a3f/ef2>
e: e9 3d 1b f6 ff jmp fff61b50 <_EIP+0xfff61b50>
Code; c029c49c <__sched_text_end+a44/ef2>
13: b8 00 00 00 00 mov $0x0,%eax

[-- Number 2]
No modules in ksyms, skipping objects
No ksyms, skipping lsmod
Unable to handle kernel paging request at virtual address 00007990
c029c489
*pde = 00000000
Oops: 0002 [#1]
CPU: 0
EIP: 0060:[<c029c489>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246 (2.6.7)
eax: 00000000 ebx: 00000670 ecx: 00000670 edx: 0819ce70
esi: 0819c800 edi: 00007990 ebp: c158dde0 esp: d1d2fe78
ds: 007b es: 007b ss: 0068
Stack: 00000000 00000670 00000e1c 0a405d3b 00001057 00000000 00007990 c01f9482
00007990 0819c800 00000670 00000670 e0913360 df251400 e0901896 00007990
0819c800 00000670 c011ab90 d050f690 085b5e64 0000019c 00002000 df251400
Call Trace:
[<c01f9482>] copy_from_user+0x42/0x80
[<e0901896>] snd_pcm_lib_write_transfer+0x96/0xb0 [snd_pcm]
[<c011ab90>] process_timeout+0x0/0x10
[<e0901afe>] snd_pcm_lib_write1+0x24e/0x3e0 [snd_pcm]
[<c0110ab0>] default_wake_function+0x0/0x20
[<c0103f28>] common_interrupt+0x18/0x20
[<e0901d17>] snd_pcm_lib_write+0x87/0xa0 [snd_pcm]
[<e0901800>] snd_pcm_lib_write_transfer+0x0/0xb0 [snd_pcm]
[<e08fcd6a>] snd_pcm_playback_ioctl1+0x29a/0x300 [snd_pcm]
[<c0154315>] sys_ioctl+0xd5/0x240
[<c0103d69>] sysenter_past_esp+0x52/0x71
Code: f3 aa 58 59 e9 38 cf f5 ff b8 f2 ff ff ff e9 3d 1b f6 ff b8

>>EIP; c029c489 <__sched_text_end+a31/ef2> <=====

>>ebp; c158dde0 <pg0+120dde0/3fc7e000>
>>esp; d1d2fe78 <pg0+119afe78/3fc7e000>

Trace; c01f9482 <copy_from_user+42/80>
Trace; e0901896 <pg0+20581896/3fc7e000>
Trace; c011ab90 <process_timeout+0/10>
Trace; e0901afe <pg0+20581afe/3fc7e000>
Trace; c0110ab0 <default_wake_function+0/20>
Trace; c0103f28 <common_interrupt+18/20>
Trace; e0901d17 <pg0+20581d17/3fc7e000>
Trace; e0901800 <pg0+20581800/3fc7e000>
Trace; e08fcd6a <pg0+2057cd6a/3fc7e000>
Trace; c0154315 <sys_ioctl+d5/240>
Trace; c0103d69 <sysenter_past_esp+52/71>

Code; c029c489 <__sched_text_end+a31/ef2>
00000000 <_EIP>:
Code; c029c489 <__sched_text_end+a31/ef2> <=====
0: f3 aa repz stos %al,%es:(%edi) <=====
Code; c029c48b <__sched_text_end+a33/ef2>
2: 58 pop %eax
Code; c029c48c <__sched_text_end+a34/ef2>
3: 59 pop %ecx
Code; c029c48d <__sched_text_end+a35/ef2>
4: e9 38 cf f5 ff jmp fff5cf41 <_EIP+0xfff5cf41>
Code; c029c492 <__sched_text_end+a3a/ef2>
9: b8 f2 ff ff ff mov $0xfffffff2,%eax
Code; c029c497 <__sched_text_end+a3f/ef2>
e: e9 3d 1b f6 ff jmp fff61b50 <_EIP+0xfff61b50>
Code; c029c49c <__sched_text_end+a44/ef2>
13: b8 00 00 00 00 mov $0x0,%eax

[-- Number 3]
Error (regular_file): read_ksyms stat /proc/ksyms failed
No modules in ksyms, skipping objects
No ksyms, skipping lsmod
Unable to handle kernel paging request at virtual address 00005af0
c029b23d
*pde = 00000000
Oops: 0002 [#1]
CPU: 0
EIP: 0060:[<c029b23d>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246 (2.6.8-rc3)
eax: 00000000 ebx: 00001000 ecx: 00001000 edx: 0819d800
esi: 0819c800 edi: 00005af0 ebp: c15d1de0 esp: d23d4e78
ds: 007b es: 007b ss: 0068
Stack: 00000000 00001000 000008b0 8bc4bb92 000008e4 00000000 00005af0 c01f7282
00005af0 0819c800 00001000 00001000 e091f360 d2214400 e090d896 00005af0
0819c800 00001000 c011b050 c16f6bd0 0b4ff6bc 00000400 00002000 d2214400
Call Trace:
[<c01f7282>] copy_from_user+0x42/0x80
[<e090d896>] snd_pcm_lib_write_transfer+0x96/0xb0 [snd_pcm]
[<c011b050>] process_timeout+0x0/0x10
[<e090dafe>] snd_pcm_lib_write1+0x24e/0x3e0 [snd_pcm]
[<c0110d50>] default_wake_function+0x0/0x20
[<e090dd17>] snd_pcm_lib_write+0x87/0xa0 [snd_pcm]
[<e090d800>] snd_pcm_lib_write_transfer+0x0/0xb0 [snd_pcm]
[<e0908d6a>] snd_pcm_playback_ioctl1+0x29a/0x300 [snd_pcm]
[<c0155b95>] sys_ioctl+0xd5/0x240
[<c0103e39>] sysenter_past_esp+0x52/0x71
Code: f3 aa 58 59 e9 84 bf f5 ff b8 f2 ff ff ff e9 09 0b f6 ff b8

>>EIP; c029b23d <__sched_text_end+a25/ee6> <=====

>>ebp; c15d1de0 <pg0+1253de0/3fc80000>
>>esp; d23d4e78 <pg0+12056e78/3fc80000>

Trace; c01f7282 <copy_from_user+42/80>
Trace; e090d896 <pg0+2058f896/3fc80000>
Trace; c011b050 <process_timeout+0/10>
Trace; e090dafe <pg0+2058fafe/3fc80000>
Trace; c0110d50 <default_wake_function+0/20>
Trace; e090dd17 <pg0+2058fd17/3fc80000>
Trace; e090d800 <pg0+2058f800/3fc80000>
Trace; e0908d6a <pg0+2058ad6a/3fc80000>
Trace; c0155b95 <sys_ioctl+d5/240>
Trace; c0103e39 <sysenter_past_esp+52/71>
Code; c029b23d <__sched_text_end+a25/ee6>
00000000 <_EIP>:
Code; c029b23d <__sched_text_end+a25/ee6> <=====
0: f3 aa repz stos %al,%es:(%edi) <=====
Code; c029b23f <__sched_text_end+a27/ee6>
2: 58 pop %eax
Code; c029b240 <__sched_text_end+a28/ee6>
3: 59 pop %ecx
Code; c029b241 <__sched_text_end+a29/ee6>
4: e9 84 bf f5 ff jmp fff5bf8d <_EIP+0xfff5bf8d>
Code; c029b246 <__sched_text_end+a2e/ee6>
9: b8 f2 ff ff ff mov $0xfffffff2,%eax
Code; c029b24b <__sched_text_end+a33/ee6>
e: e9 09 0b f6 ff jmp fff60b1c <_EIP+0xfff60b1c>
Code; c029b250 <__sched_text_end+a38/ee6>
13: b8 00 00 00 00 mov $0x0,%eax

--
Mika Boström +358-40-525-7347 \-/ "World peace will be achieved
Bostik@iki.fi www.iki.fi/bostik X when the last man has killed
Security freak, and proud of it. /-\ the second-to-last." -anon?
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