kernel BUG at filemap.c:81!

From: Pozsar Balazs (
Date: Mon Sep 23 2002 - 15:32:40 EST


I'm running Yellow Dog Linx 2.3 on a PowerBook G4, with the ydl stock
2.4.19-4a kernel.
I just compiled and loaded the alsa 0.9rc3 driver. Shortly after testing
with mplayer :), I get this oops:

ksymoops 2.4.1 on ppc 2.4.19-4a. Options used
     -V (default)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.19-4a/ (default)
     -m /boot/ (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

Warning (compare_maps): mismatch on symbol xchg_u32 , ksyms_base says c000e014, says c0008904. Ignoring ksyms_base entry
Warning (compare_maps): mismatch on symbol snd_cards_count , snd says e3397644, /lib/modules/2.4.19-4a/kernel/sound/acore/snd.o says e3397e38. Ignoring /lib/modules/2.4.19-4a/kernel/sound/acore/snd.o entry
Warning (compare_maps): mismatch on symbol snd_seq_root , snd says e3397674, /lib/modules/2.4.19-4a/kernel/sound/acore/snd.o says e3397e68. Ignoring /lib/modules/2.4.19-4a/kernel/sound/acore/snd.o entry
Warning (compare_maps): mismatch on symbol md_size , md says e3365ae0, /lib/modules/2.4.19-4a/kernel/drivers/md/md.o says e3365380. Ignoring /lib/modules/2.4.19-4a/kernel/drivers/md/md.o entry
Warning (compare_maps): mismatch on symbol mddev_map , md says e33652e0, /lib/modules/2.4.19-4a/kernel/drivers/md/md.o says e3364b80. Ignoring /lib/modules/2.4.19-4a/kernel/drivers/md/md.o entry
0514) Richard Gooch (
kernel BUG at filemap.c:81!
Oops: Exception in kernel mode, sig: 4
NIP: C002CAF0 XER: 00000000 LR: C002CAF0 SP: D3F9DE50 REGS: d3f9dda0 TRAP: 0700 Not tainted
Using defaults from ksymoops -t elf32-powerpc -a powerpc:common
MSR: 00089032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
TASK = d3f9c000[4754] 'mplayer' Last syscall: 3
last math d3f9c000 last altivec 00000000
GPR00: C002CAF0 D3F9DE50 D3F9C000 0000001C 00001032 00000001 00000020 C03A0000
GPR08: 00000000 00000000 0000001F D3F9DD70 00000050 102022F8 10200000 10200000
GPR16: 7FFFF88C 00000000 102E7A90 C002EBAC DA8733C0 00000001 D3F9DEF8 D7294A00
GPR24: 00001000 00000000 0000001F DA8733A0 DFEAEDBC D7294AAC 00000001 C09FE6A0
Call backtrace:
C002CAF0 C002D980 C002DA68 C002E3F0 C002E6B0 C002ED84 C003EA38
C00061DC 0FF8B598 100D6C74 100CBF5C 100D47DC 100CC570 100CD2F4
100D21D8 100D2458 100D4AE4 100CAFAC 10008D58 0F9BFF70 00000000
Warning (Oops_read): Code line not seen, dumping what data is available

>>NIP; c002caf0 <add_page_to_hash_queue+50/7c> <=====
Trace; c002caf0 <add_page_to_hash_queue+50/7c>
Trace; c002d980 <add_to_page_cache_unique+a4/d0>
Trace; c002da68 <page_cache_read+bc/118>
Trace; c002e3f0 <generic_file_readahead+168/1c8>
Trace; c002e6b0 <do_generic_file_read+1ec/4a8>
Trace; c002ed84 <generic_file_read+90/180>
Trace; c003ea38 <sys_read+c8/14c>
Trace; c00061dc <ret_from_syscall_1+0/b4>
Trace; 0ff8b598 Before first symbol
Trace; 100d6c74 Before first symbol
Trace; 100cbf5c Before first symbol
Trace; 100d47dc Before first symbol
Trace; 100cc570 Before first symbol
Trace; 100cd2f4 Before first symbol
Trace; 100d21d8 Before first symbol
Trace; 100d2458 Before first symbol
Trace; 100d4ae4 Before first symbol
Trace; 100cafac Before first symbol
Trace; 10008d58 Before first symbol
Trace; 0f9bff70 Before first symbol
Trace; 00000000 Before first symbol

7 warnings issued. Results may not be reliable.

I am not sure if the above ksymoops report is correct, tell me what can I
do for you.

The same problem exists with the newest alsa driver from cvs.

Is this a general kernel bug, or an alsa-bug?



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