Hi Roland,
On 12/29/2010 10:27 PM, Roland Kletzing wrote:
Hello,
i assume this is not expected behaviour.
see below
kernel is 2.6.37-rc7
regards
roland
[root@ubuntu]:~# modprobe mem2mem_testdev;modprobe -r mem2mem_testdev;modprobe mem2mem_testdevKilled
[ 80.266552] m2m-testdev m2m-testdev.0: mem2mem-testdevDevice registered as /dev/video0
[ 80.292786] m2m-testdev m2m-testdev.0: Removing mem2mem-testdev
[ 80.323013] BUG: unable to handle kernel paging request at 7562696c
This is caused by a second attempt to free an instance of struct
video_device in function m2mtest_remove.
The regression is caused by commit
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=71088bad7426650e4ea5fb4182580ea8458442e7
Reverting it should fix the problem.
There is no need to call video_device_release when unloading the module
because video_device_release is already assigned to
m2mtest_videodev.release and v4l core uses this callback to free memory
at the right time.
The issue had been noticed before but somehow the fix didn't make it to
mainline kernel until now.
Adding Pawel's new email address at CC.
Regards,
Sylwester
[ 80.323685] IP: [ ] __kmalloc_track_caller+0x95/0x1c0[ 80.324094] *pde
= 00000000
[ 80.324094] Oops: 0000 [#1] SMP
[ 80.324094] last sysfs file: /sys/module/videobuf_vmalloc/refcnt
[ 80.324094] Modules linked in: videobuf_core snd_ens1371 gameport
snd_rawmidi snd_seq_device snd_ac97_codec ac97_bus snd_pcm snd_timer snd
psmouse soundcore snd_page_alloc intel_agp lp ppdev serio_raw parport_pc
intel_gtt shpchp vmw_balloon agpgart i2c_piix4 parport pcnet32 mptspi
mptscsih floppy mii mptbase scsi_transport_spi [last unloaded:
videobuf_vmalloc][ 80.324094][ 80.324094] Pid: 731, comm
: modprobe Not tainted 2.6.37-rc7 #3 440BX Desktop Reference Platform/VMware Virtual Platform[ 80.324094] EIP: 0060:[ ] EFLAGS: 00010006 CPU: 0[ 80.324094] EIP is at __kmalloc_track_caller+0x95/0x1c0[ 80.324094] EAX: df406ff8 EBX: 0000013c ECX: 7562696c EDX: 00000000[ 80.324094] ESI: df002500 EDI: 000000d0 EBP: de771e70 ESP: de771e44[ 80.324094] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068[ 80.324094] Process modprobe (pid: 731, ti=de770000 task=de4d5860 task.ti=de770000)[ 80.324094] Stack:[ 80.324094] ffffffff 00000757 00000000 c04f5d4e de4220c4 c035ef4b 00000246 7562696c[ 80.324094] de50a9c0 000000d0 000000ab de771e90 c04f5d78 df002180 00000000 00000080[ 80.324094] 00000020 df0007b0 de422000 de771ee0 c035ef4b ffffffff c0755692 00000757[ 80.324094] Call Trace:[ 80.324094] [ ] ? __alloc_
skb+0x2e/0x100[ 80.324094] [ ] ? kobject_uevent_env+0x29b/0x430[ 80.324094] [ ] ? __alloc_skb+0x58/0x100[ 80.324094] [ ] ? kobject_uevent_env+0x29b/0x430[ 80.324094] [ ] ? kobject_uevent+0xa/0x10[ 80.324094] [ ] ? kobject_release+0x74/0x80[ 80.324094] [ ] ? kobject_release+0x0/0x80[ 80.324094] [ ] ? kref_put+0x2d/0x60[ 80.324094] [ ] ? kobject_put+0x1d/0x50[ 80.324094] [ ] ? free_sect_attrs+0x32/0x40[ 80.324094] [ ] ? free_module+0x143/0x1c0[ 80.324094] [ ] ? sys_delete_module+0x16e/0x200[ 80.324094] [ ] ? sysenter_do_call+0x12/0x28[ 80.324094] Code: 9c 58 8d 44 20 00 89 45 ec fa 8d 44 20 00 90 8b 06 64 03 05 94 80 8c c0 8b 10 85 d2 89 55 f0 0f 84 0b 01 00 00 8b 56 10 8b 4d f0 14 11 89 10 8b 45 ec 50 9d 8d 44 20 00 8b 55 f0 85 d2 75 46[ 80.324094] EIP: [ ] __kmalloc_track_caller+0x95/0
x1c0 SS:ESP 0068:de771e44[ 80.324094] CR2: 000000007562696c[ 80.324094] ---[ end trace 1c390fe96c782b4a ]---[ 80.336810] BUG: unable to handle kernel paging request at 7562696c[ 80.337045] IP: [ ] kmem_cache_alloc_notrace+0x52/0xa0[ 80.337207] *pde = 00000000[ 80.337323] Oops: 0000 [#2] SMP[ 80.337454] last sysfs file: /sys/module/videobuf_vmalloc/refcnt[ 80.337596] Modules linked in: videobuf_core snd_ens1371 gameport snd_rawmidi snd_seq_device snd_ac97_codec ac97_bus snd_pcm snd_timer snd psmouse soundcore snd_page_alloc intel_agp lp ppdev serio_raw parport_pc intel_gtt shpchp vmw_balloon agpgart i2c_piix4 parport pcnet32 mptspi mptscsih floppy mii mptbase scsi_transport_spi [last unloaded: videobuf_vmalloc][ 80.338648][ 80.338812] Pid: 706, comm: bash Tainted: G D 2.6.37-rc7 #3 440BX
Desktop Reference Platform/VMware Virtual Platform[ 80.339076] EIP: 0060:[ ] EFLAGS: 00010006 CPU: 0[ 80.339208] EIP is at kmem_cache_alloc_notrace+0x52/0xa0[ 80.339336] EAX: df406ff8 EBX: 7562696c ECX: c02258bc EDX: 00000000[ 80.339473] ESI: df002500 EDI: 000080d0 EBP: de51ff18 ESP: de51ff00[ 80.339611] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068[ 80.339739] Process bash (pid: 706, ti=de51e000 task=de4d25e0 task.ti=de51e000)[ 80.339957] Stack:[ 80.340056] 0871c3c8 c02258bc 00000246 cbe22c40 df002500 de106bd0 de51ff38 c02258bc[ 80.340072] 00000040 000080d0 de51ff38 de106bd0 00000000 0871c3c8 de51ff60 c0225990[ 80.340072] 00000000 00000000 c072e378 cbf5f8f4 de51ffb4 ffffffea 00000000 0871c3c8[ 80.340072] Call Trace:[ 80.340072] [ ] ? alloc_pipe_info+0x6c/0xf0[ 80.340072] [ ] ? alloc_pipe
_info+0x6c/0xf0[ 80.340072] [ ] ? create_write_pipe+0x50/0x190[ 80.340072] [ ] ? do_pipe_flags+0x3f/0x110[ 80.340072] [ ] ? sys_pipe2+0x1e/0x60[ 80.340072] [ ] ? sys_rt_sigprocmask+0x99/0xf0[ 80.340072] [ ] ? sys_pipe+0x1e/0x20[ 80.340072] [ ] ? sysenter_do_call+0x12/0x28[ 80.340072] Code: 4d ec e8 12 43 3c 00 8b 4d ec 9c 58 8d 44 20 00 89 45 f0 fa 8d 44 20 00 90 8b 06 64 03 05 94 80 8c c0 8b 18 85 db 74 3c 8b 56 10 14 13 89 10 8b 45 f0 50 9d 8d 44 20 00 85 db 75 14 89 d8 8b[ 80.340072] EIP: [ ] kmem_cache_alloc_notrace+0x52/0xa0 SS:ESP 0068:de51ff00[ 80.340072] CR2: 000000007562696c[ 80.340072] ---[ end trace 1c390fe96c782b4b ]---
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