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Subject[2.5.64-mm1] sysfs oops

The following was experienced while running Andrew's 2.5.64-mm1 kernel. My
dialup (ppp) connection was terminated, and when I attempted to re-establish,
pppd would not come up. I found the following oops in dmesg and have provided
a decoded version below.

This doesn't appear to be fixed in mainline, yet. Is it mm specific? dcache?

Alistair Strachan.
ksymoops 2.4.8 on i686 2.5.64-mm1. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.5.64-mm1/ (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.

Error (regular_file): read_ksyms stat /proc/ksyms failed
ksymoops: No such file or directory
No modules in ksyms, skipping objects
No ksyms, skipping lsmod
kernel BUG at include/linux/dcache.h:266!
invalid operand: 0000
CPU: 0
EIP: 0060:[<c01759fc>] Tainted: PF
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000 ebx: dc6d9184 ecx: 00000000 edx: 00000000
esi: d7b9d300 edi: c959a000 ebp: 00000000 esp: c959bed8
ds: 007b es: 007b ss: 0068
Stack: c02b0fc1 dc6d9000 c03455f4 dc6d9184 dc6d9000 c959a000 00000000 c01afb73
dc6d9184 dc6d9184 c01afba3 dc6d9184 00000000 c026b64d dc6d9184 00000006
dc6d9000 00000000 dc6d9000 dfd2b680 c0334600 c01f0bbd dc6d9000 cd57d440
Call Trace: [<c02b0fc1>] [<c01afb73>] [<c01afba3>] [<c026b64d>] [<c01f0bbd>] [<c01ee67c>] [<c01edb06>] [<c0149e68>] [<c0158e45>] [<c0148700>] [<c01090c7>]
Code: 0f 0b 0a 01 9e 23 2e c0 ff 06 83 4e 04 08 85 f6 0f 84 02 01

>>EIP; c01759fc <sysfs_remove_dir+1c/13c> <=====

Trace; c02b0fc1 <addrconf_notify+71/e0>
Trace; c01afb73 <kobject_del+13/30>
Trace; c01afba3 <kobject_unregister+13/30>
Trace; c026b64d <unregister_netdevice+1bd/295>
Trace; c01f0bbd <ppp_shutdown_interface+ad/120>
Trace; c01ee67c <ppp_ioctl+7cc/800>
Trace; c01edb06 <ppp_release+46/70>
Trace; c0149e68 <__fput+98/e0>
Trace; c0158e45 <sys_ioctl+c5/250>
Trace; c0148700 <sys_close+50/60>
Trace; c01090c7 <syscall_call+7/b>

Code; c01759fc <sysfs_remove_dir+1c/13c>
00000000 <_EIP>:
Code; c01759fc <sysfs_remove_dir+1c/13c> <=====
0: 0f 0b ud2a <=====
Code; c01759fe <sysfs_remove_dir+1e/13c>
2: 0a 01 or (%ecx),%al
Code; c0175a00 <sysfs_remove_dir+20/13c>
4: 9e sahf
Code; c0175a01 <sysfs_remove_dir+21/13c>
5: 23 2e and (%esi),%ebp
Code; c0175a03 <sysfs_remove_dir+23/13c>
7: c0 ff 06 sar $0x6,%bh
Code; c0175a06 <sysfs_remove_dir+26/13c>
a: 83 4e 04 08 orl $0x8,0x4(%esi)
Code; c0175a0a <sysfs_remove_dir+2a/13c>
e: 85 f6 test %esi,%esi
Code; c0175a0c <sysfs_remove_dir+2c/13c>
10: 0f 84 02 01 00 00 je 118 <_EIP+0x118>

1 warning and 1 error issued. Results may not be reliable.
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