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SubjectRe: OOPS (kswapd) in 2.4.5 and 2.4.6
In mailing-lists.linux-kernel, you wrote:

> We've noticed the following kernel error since 2.4 (2.4.1-2.4.6).
> It appears to be swap (kswapd thread specific?) related. The same
> error is reported on several SMP machines after only a short period
> (an hour or less).

FYI, I see a similar problem under 2.4.5, also SMP, although only
intermittently. Two oopses are below, from two different, although
similarly configured, machines.

A bit of warning: these kernels were patched with MOSIX-1.04
(www.mosix.org), but I don't believe that it touches the relevant
parts of the kernel. Moreover, the MOSIX developers suggested these
oopses were not MOSIX-related, and they are usually pretty good about
that.

Cheers,
Wayne


ksymoops 2.3.4 on i686 2.4.5-mosix-1.0.4. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.5-mosix-1.0.4/ (default)
-m /boot/System.map (specified)

Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(shmem_file_setup) not found in System.map. Ignoring ksyms_base entry
Jun 15 01:18:17 mf3 kernel: invalid operand: 0000
Jun 15 01:18:17 mf3 kernel: CPU: 0
Jun 15 01:18:17 mf3 kernel: EIP: 0010:[clear_inode+51/260]
Jun 15 01:18:17 mf3 kernel: EIP: 0010:[<c015bca7>]
Using defaults from ksymoops -t elf32-i386 -a i386
Jun 15 01:18:17 mf3 kernel: EFLAGS: 00010292
Jun 15 01:18:17 mf3 kernel: eax: 0000001b ebx: c42cdd60 ecx: 00000001 edx: 00000001
Jun 15 01:18:17 mf3 kernel: esi: e0937860 edi: c42cdd60 ebp: 00001e7c esp: dff67f68
Jun 15 01:18:17 mf3 kernel: ds: 0018 es: 0018 ss: 0018
Jun 15 01:18:17 mf3 kernel: Process kswapd (pid: 4, stackpage=dff67000)
Jun 15 01:18:17 mf3 kernel: Stack: c023fea4 c023ff03 000001eb c42cdd60 c015c842 c42cdd60 c42f2940 c42f2920
Jun 15 01:18:17 mf3 kernel: e0929ffd c42cdd60 c42f2940 c015a040 c42f2920 c42cdd60 00000482 00000004
Jun 15 01:18:17 mf3 kernel: 00000000 0008e000 c015a399 00002bc0 c013b2b7 00000006 00000004 00000004
Jun 15 01:18:17 mf3 kernel: Call Trace: [iput+342/360] [ide-scsi:__insmod_ide-scsi_S.bss_L96+377149/32977459] [prune_dcache+220/368] [shrink_dcache_memory+33/48] [do_try_to_free_pages+39/88] [kswapd+87/228] [prepare_namespace+0/8]
Jun 15 01:18:17 mf3 kernel: Call Trace: [<c015c842>] [<e0929ffd>] [<c015a040>] [<c015a399>] [<c013b2b7>] [<c013b33f>] [<c0105000>]
Jun 15 01:18:17 mf3 kernel: [<c010550b>]
Jun 15 01:18:17 mf3 kernel: Code: 0f 0b 83 c4 0c 8d 74 26 00 8b 83 f4 00 00 00 a8 10 75 26 68

>>EIP; c015bca7 <clear_inode+33/104> <=====
Trace; c015c842 <iput+156/168>
Trace; e0929ffd <[nfs]nfs_dentry_iput+75/7c>
Trace; c015a040 <prune_dcache+dc/170>
Trace; c015a399 <shrink_dcache_memory+21/30>
Trace; c013b2b7 <do_try_to_free_pages+27/58>
Trace; c013b33f <kswapd+57/e4>
Trace; c0105000 <prepare_namespace+0/8>
Trace; c010550b <kernel_thread+23/30>
Code; c015bca7 <clear_inode+33/104>
00000000 <_EIP>:
Code; c015bca7 <clear_inode+33/104> <=====
0: 0f 0b ud2a <=====
Code; c015bca9 <clear_inode+35/104>
2: 83 c4 0c add $0xc,%esp
Code; c015bcac <clear_inode+38/104>
5: 8d 74 26 00 lea 0x0(%esi,1),%esi
Code; c015bcb0 <clear_inode+3c/104>
9: 8b 83 f4 00 00 00 mov 0xf4(%ebx),%eax
Code; c015bcb6 <clear_inode+42/104>
f: a8 10 test $0x10,%al
Code; c015bcb8 <clear_inode+44/104>
11: 75 26 jne 39 <_EIP+0x39> c015bce0 <clear_inode+6c/104>
Code; c015bcba <clear_inode+46/104>
13: 68 00 00 00 00 push $0x0

1 warning issued. Results may not be reliable.


ksymoops 2.3.4 on i686 2.4.5-mosix-1.0.4b. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.5-mosix-1.0.4b/ (default)
-m /boot/System.map (specified)

Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(shmem_file_setup) not found in System.map. Ignoring ksyms_base entry
Jun 27 09:22:58 mf2 kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000814
Jun 27 09:22:58 mf2 kernel: c015a045
Jun 27 09:22:58 mf2 kernel: *pde = 00000000
Jun 27 09:22:58 mf2 kernel: Oops: 0000
Jun 27 09:22:58 mf2 kernel: CPU: 0
Jun 27 09:22:58 mf2 kernel: EIP: 0010:[prune_dcache+209/368]
Jun 27 09:22:58 mf2 kernel: EIP: 0010:[<c015a045>]
Using defaults from ksymoops -t elf32-i386 -a i386
Jun 27 09:22:58 mf2 kernel: EFLAGS: 00010206
Jun 27 09:22:58 mf2 kernel: eax: 00000800 ebx: e959a8e0 ecx: e9596df0 edx: e9596df0
Jun 27 09:22:58 mf2 kernel: esi: e959a8c0 edi: e9596de0 ebp: 0000101b esp: c2225fa0
Jun 27 09:22:58 mf2 kernel: ds: 0018 es: 0018 ss: 0018
Jun 27 09:22:58 mf2 kernel: Process kswapd (pid: 4, stackpage=c2225000)
Jun 27 09:22:58 mf2 kernel: Stack: 000000c8 00000004 00000000 0008e000 c015a3a9 00002926 c013b2b7 00000006
Jun 27 09:22:58 mf2 kernel: 00000004 00000004 00000000 c2224000 c023bb31 c2224331 c013b33f 00000004
Jun 27 09:22:58 mf2 kernel: 00000000 00010f00 c2213fb4 c0105000 c010550b 00000000 c02bb080 c2212000
Jun 27 09:22:58 mf2 kernel: Call Trace: [shrink_dcache_memory+33/48] [do_try_to_free_pages+39/88] [kswapd+87/228] [prepare_namespace+0/8] [kernel_thread+35/48]
Jun 27 09:22:58 mf2 kernel: Call Trace: [<c015a3a9>] [<c013b2b7>] [<c013b33f>] [<c0105000>] [<c010550b>]
Jun 27 09:22:58 mf2 kernel: Code: 8b 40 14 85 c0 74 09 57 56 ff d0 83 c4 08 eb 12 57 e8 a1 26

>>EIP; c015a045 <prune_dcache+d1/170> <=====
Trace; c015a3a9 <shrink_dcache_memory+21/30>
Trace; c013b2b7 <do_try_to_free_pages+27/58>
Trace; c013b33f <kswapd+57/e4>
Trace; c0105000 <prepare_namespace+0/8>
Trace; c010550b <kernel_thread+23/30>
Code; c015a045 <prune_dcache+d1/170>
00000000 <_EIP>:
Code; c015a045 <prune_dcache+d1/170> <=====
0: 8b 40 14 mov 0x14(%eax),%eax <=====
Code; c015a048 <prune_dcache+d4/170>
3: 85 c0 test %eax,%eax
Code; c015a04a <prune_dcache+d6/170>
5: 74 09 je 10 <_EIP+0x10> c015a055 <prune_dcache+e1/170>
Code; c015a04c <prune_dcache+d8/170>
7: 57 push %edi
Code; c015a04d <prune_dcache+d9/170>
8: 56 push %esi
Code; c015a04e <prune_dcache+da/170>
9: ff d0 call *%eax
Code; c015a050 <prune_dcache+dc/170>
b: 83 c4 08 add $0x8,%esp
Code; c015a053 <prune_dcache+df/170>
e: eb 12 jmp 22 <_EIP+0x22> c015a067 <prune_dcache+f3/170>
Code; c015a055 <prune_dcache+e1/170>
10: 57 push %edi
Code; c015a056 <prune_dcache+e2/170>
11: e8 a1 26 00 00 call 26b7 <_EIP+0x26b7> c015c6fc <iput+0/168>

1 warning issued. Results may not be reliable.
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