Re: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U3

[Dominik Karall]

On Saturday 16 October 2004 22:31, Lee Revell wrote:
> On Sat, 2004-10-16 at 16:30, Dominik Karall wrote:
> > sorry, i tried to reproduce this bug, but can't. i even don't know _when_
> > this bug occurred, as i just wanted to take a look in the dmesg output
> > after loading sg module. but it does not depend on sg, as i unloaded it
> > and tried again to load.
>
> The trace looks like mplayer reading from a FAT filesystem.  Can you
> reproduce the problem if you do whatever you were doing with mplayer
> again?
>
> Lee

i could reproduce it now, but only once. it appeared when i started an avi 
movie from my fat32 partition. mplayer stopped at buffering 2% and does not 
play the movie. i tried to start mplayer again and reproduce it, but the bug 
does not appear again. mplayer only stopped at 2% buffering and does nothing 
more. it seems like the file couldn't be read clearly now from the fat32 
partition, as it does not work with xine and others too.
here is the bug i get now:

------------[ cut here ]------------
kernel BUG at fs/fat/cache.c:150!
invalid operand: 0000 [#2]
PREEMPT
Modules linked in: sg sr_mod ipx p8022 psnap llc nvidia snd_mixer_oss sd_mod 
tda9887 tuner saa7134 video_buf v4l2_common v4l1_compat ir_common videodev 
8139too sis900 crc32 ehci_hcd usb_storage scsi_mod ohci_hcd usbcore 
snd_intel8x0 snd_ac97_codec snd_pcm snd_timer snd soundcore snd_page_alloc 
ohci1394 ieee1394 i2c_sis96x i2c_core
CPU:    0
EIP:    0060:[<c01a0b53>]    Tainted: P      VLI
EFLAGS: 00210202   (2.6.9-rc4-mm1-vp-u3)
EIP is at fat_cache_add+0x135/0x151
eax: 00000001   ebx: cf57136c   ecx: cf57127c   edx: cf571301
esi: c1e53c50   edi: cd0d63c8   ebp: cd0d6418   esp: c1e53c1c
ds: 007b   es: 007b   ss: 0068   preempt: 00000001
Process mplayer (pid: 29320, threadinfo=c1e53000 task=c6abca20)
Stack: cd0d6418 c1e53c88 cf785800 00000001 cd0d63c8 c01a11bb c1e53c88 c1e53c8c
       00000000 00000000 00000000 0003ffff cd0d6418 00000000 00000000 00000001
       00093710 cd0d6418 cd0d63c8 cf785800 cee1d800 c01a12c1 c1e53c8c 00000000
Call Trace:
 [<c01a11bb>] fat_get_cluster+0x11f/0x1de
 [<c01a12c1>] fat_bmap_cluster+0x47/0x98
 [<c01a13f1>] fat_bmap+0xdf/0x101
 [<c01a36e8>] fat_get_block+0x30/0x198
 [<c0152866>] alloc_buffer_head+0x33/0x52
 [<c01501ea>] create_buffers+0x51/0x86
 [<c015141c>] block_read_full_page+0x1bd/0x2cc
 [<c01a36b8>] fat_get_block+0x0/0x198
 [<c0132f0c>] add_to_page_cache+0x58/0x6e
 [<c013a0e4>] read_pages+0xbe/0x15e
 [<c013a49c>] do_page_cache_readahead+0x120/0x19b
 [<c013a606>] page_cache_readahead+0xef/0x1f8
 [<c01336ab>] do_generic_mapping_read+0x133/0x54b
 [<c013c911>] lru_cache_add+0xd/0x4f
 [<c0133d53>] __generic_file_aio_read+0x1a3/0x218
 [<c0133ac3>] file_read_actor+0x0/0xed
 [<c0133ec5>] generic_file_read+0x9c/0xba
 [<c012b84c>] _mutex_lock+0x20/0x36
 [<c01244c8>] do_sigaction+0x1dc/0x1f7
 [<c012b468>] autoremove_wake_function+0x0/0x43
 [<c012b84c>] _mutex_lock+0x20/0x36
 [<c0167974>] dnotify_parent+0x35/0x95
 [<c014e0a9>] vfs_read+0xcd/0x126
 [<c014e36f>] sys_read+0x41/0x6a
 [<c0103f7b>] syscall_call+0x7/0xb
Code: f2 89 e8 e8 9f fe ff ff 85 c0 89 c3 74 2a 83 6f 20 01 8b 04 24 39 00 75 
24 8b 14 24 a1 74 0b 3c c0 e8 9c b1 f9 ff e9 40 ff ff ff <0f> 0b 96 00 e5 b7 
2d c0 e9 2f ff ff ff 8b 1c 24 eb 88 0f 0b 48


best regards,
dominik

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