OK, I discovered one of my problems (a dumb one, at that); I'd
aparently broken part of my build script and wasn't updating the
alsa-kernel subtree properly. I backed out the change in init.c and
updated/rebuilt. I still get an kernel oops, but was left running and
was able to get kysmoops to give something; here's what I get:
ksymoops 2.4.1 on i686 2.4.22. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.22/ (default)
-m /usr/src/linux/System.map (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): ksyms_base symbol
IO_APIC_get_PCI_irq_vector_R__ver_IO_APIC_get_PCI_irq_vector not found in System.map.
Ignoring ksyms_base entry
Warning (compare_maps): mismatch on symbol snd_pcm_devices , snd-pcm says cc8d3ae0,
/lib/modules/2.4.22/kernel/sound/acore/snd-pcm.o says cc8d36c0. Ignoring
/lib/modules/2.4.22/kernel/sound/acore/snd-pcm.o entry
Warning (compare_maps): mismatch on symbol snd_pcm_link_rwlock , snd-pcm says
cc8d3be0, /lib/modules/2.4.22/kernel/sound/acore/snd-pcm.o says cc8d37c0. Ignoring
/lib/modules/2.4.22/kernel/sound/acore/snd-pcm.o entry
Warning (compare_maps): mismatch on symbol snd_cards , snd says cc8ae9e0,
/lib/modules/2.4.22/kernel/sound/acore/snd.o says cc8ae820. Ignoring
/lib/modules/2.4.22/kernel/sound/acore/snd.o entry
Warning (compare_maps): mismatch on symbol snd_cards_count , snd says cc8ae9c0,
/lib/modules/2.4.22/kernel/sound/acore/snd.o says cc8ae800. Ignoring
/lib/modules/2.4.22/kernel/sound/acore/snd.o entry
Warning (compare_maps): mismatch on symbol snd_ecards_limit , snd says cc8ae964,
/lib/modules/2.4.22/kernel/sound/acore/snd.o says cc8ae7a4. Ignoring
/lib/modules/2.4.22/kernel/sound/acore/snd.o entry
Warning (compare_maps): mismatch on symbol snd_major , snd says cc8ae968,
/lib/modules/2.4.22/kernel/sound/acore/snd.o says cc8ae7a8. Ignoring
/lib/modules/2.4.22/kernel/sound/acore/snd.o entry
Warning (compare_maps): mismatch on symbol snd_mixer_oss_notify_callback , snd says
cc8aea08, /lib/modules/2.4.22/kernel/sound/acore/snd.o says cc8ae848. Ignoring
/lib/modules/2.4.22/kernel/sound/acore/snd.o entry
Warning (compare_maps): mismatch on symbol snd_seq_root , snd says cc8aea14,
/lib/modules/2.4.22/kernel/sound/acore/snd.o says cc8ae854. Ignoring
/lib/modules/2.4.22/kernel/sound/acore/snd.o entry
Warning (compare_maps): mismatch on symbol nlmsvc_ops , lockd says cc88d510,
/lib/modules/2.4.22/kernel/fs/lockd/lockd.o says cc88c7d0. Ignoring
/lib/modules/2.4.22/kernel/fs/lockd/lockd.o entry
Warning (compare_maps): mismatch on symbol nfs_debug , sunrpc says cc880ccc,
/lib/modules/2.4.22/kernel/net/sunrpc/sunrpc.o says cc88098c. Ignoring
/lib/modules/2.4.22/kernel/net/sunrpc/sunrpc.o entry
Warning (compare_maps): mismatch on symbol nfsd_debug , sunrpc says cc880cd0,
/lib/modules/2.4.22/kernel/net/sunrpc/sunrpc.o says cc880990. Ignoring
/lib/modules/2.4.22/kernel/net/sunrpc/sunrpc.o entry
Warning (compare_maps): mismatch on symbol nlm_debug , sunrpc says cc880cd4,
/lib/modules/2.4.22/kernel/net/sunrpc/sunrpc.o says cc880994. Ignoring
/lib/modules/2.4.22/kernel/net/sunrpc/sunrpc.o entry
Warning (compare_maps): mismatch on symbol rpc_debug , sunrpc says cc880cc8,
/lib/modules/2.4.22/kernel/net/sunrpc/sunrpc.o says cc880988. Ignoring
/lib/modules/2.4.22/kernel/net/sunrpc/sunrpc.o entry
Warning (compare_maps): ip_conntrack symbol GPLONLY_ip_conntrack_expect_find_get not
found in /lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o. Ignoring
/lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o entry
Warning (compare_maps): ip_conntrack symbol GPLONLY_ip_conntrack_expect_put not found
in /lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o. Ignoring
/lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o entry
Warning (compare_maps): ip_conntrack symbol GPLONLY_ip_conntrack_find_get not found in
/lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o. Ignoring
/lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o entry
Warning (compare_maps): ip_conntrack symbol GPLONLY_ip_conntrack_put not found in
/lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o. Ignoring
/lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o entry
Warning (compare_maps): mismatch on symbol ip_conntrack_hash , ip_conntrack says
cc8618d4, /lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o says cc8613a0.
Ignoring /lib/modules/2.4.22/kernel/net/ipv4/netfilter/ip_conntrack.o entry
Warning (compare_maps): mismatch on symbol usb_devfs_handle , usbcore says cc8490f4,
/lib/modules/2.4.22/kernel/drivers/usb/usbcore.o says cc848b74. Ignoring
/lib/modules/2.4.22/kernel/drivers/usb/usbcore.o entry
Unable to handle kernel NULL pointer dereference at virtual address 00000000
c0113b58
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c0113b58>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010086
eax: c8309d84 ebx: c67ea000 ecx: 00000000 edx: 00000003
esi: c8309d84 edi: c2741820 ebp: c67ebf20 esp: c67ebf00
ds: 0018 es: 0018 ss: 0018
Process amixer (pid: 18841, stackpage=c67eb000)
Stack: cbf3d1e0 c8309c00 c2741820 c8309d88 cc8ae7c0 00000001 00000286 00000003
c8309d4c cc8a880a c2741820 00000000 00000282 c8309d5c c8309d5c c8456820
c8309c00 cc8aa0dd c8309c00 c2741820 00000000 c8456840 c8309d5c c2741820
Call Trace: [<cc8ae7c0>] [<cc8a880a>] [<cc8aa0dd>] [<c0136bc4>] [<c0135827>]
[<c013588b>] [<c0106d9b>]
Code: 8b 01 85 45 fc 74 6a c7 45 f0 00 00 00 00 9c 5f fa ff 43 04
>>EIP; c0113b58 <__wake_up+48/ec> <=====
Trace; cc8ae7c0 <[snd]snd_fops+0/44>
Trace; cc8a880a <[snd]snd_card_file_remove+aa/d0>
Trace; cc8aa0dd <[snd]snd_ctl_release+11d/140>
Trace; c0136bc4 <fput+4c/f8>
Trace; c0135827 <filp_close+93/a0>
Trace; c013588b <sys_close+57/7c>
Trace; c0106d9b <system_call+33/38>
Code; c0113b58 <__wake_up+48/ec>
00000000 <_EIP>:
Code; c0113b58 <__wake_up+48/ec> <=====
0: 8b 01 mov (%ecx),%eax <=====
Code; c0113b5a <__wake_up+4a/ec>
2: 85 45 fc test %eax,0xfffffffc(%ebp)
Code; c0113b5d <__wake_up+4d/ec>
5: 74 6a je 71 <_EIP+0x71>
Code; c0113b5f <__wake_up+4f/ec>
7: c7 45 f0 00 00 00 00 movl $0x0,0xfffffff0(%ebp)
Code; c0113b66 <__wake_up+56/ec>
e: 9c pushf
Code; c0113b67 <__wake_up+57/ec>
f: 5f pop %edi
Code; c0113b68 <__wake_up+58/ec>
10: fa cli
Code; c0113b69 <__wake_up+59/ec>
11: ff 43 04 incl 0x4(%ebx)
21 warnings issued. Results may not be reliable.
For what it's worth, I also get the messages
Before the oops:
PCI: Found IRQ 9 for device 00:08.1
PCI: Sharing IRQ 9 with 00:0a.0
nm256: Mapping port 1 from 0x24c5a0 - 0x25a800
After:
<6>note: amixer[18841] exited with preempt_count 1
I can comment out the wake_up call again. What do you think?
David
Takashi Iwai writes:
> At Fri, 17 Oct 2003 11:57:35 -0400,
> David Ronis wrote:
> >
> > Hi Takashi,
> >
> > You wrote:
> >
> > > i don't see any obvious bug there.
> > > what happens if you comment out the lines
> > >
> > > if (card->files == NULL)
> > > wake_up(&card->shutdown_sleep);
> > >
> > > in alsa-kernel/core/init.c:661 ?
> > >
> >
> > I did this, rebuilt/installed, and ran aplay; the system froze. I
> > rebooted and tried again. It froze again, but this time I saw the
> > kernel oops on the screen. (seems to be a NULL pointer dereference
> > problem). There was also an additional line:
> >
> > <6>note: amixer[1048] exited with preempt_count 4
> > ...
> > <6>note: rplayd[1048] exited with preempt_count 4
>
> hmm, there might unblanced spinlocks.
>
>
> Takashi
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