2.6.30 - kernel BUG at lib/kernel_lock.c:126!

[Jeff Chua]

Executing "mount -o remount -r" on a busy reiserfs filesystem causes
the following oops.

Sync will just hang after this oops. Happens on 2.6.30.

If there's no activity on the partition, sync, sync, and remount as
read-only will be ok. No oops.

Bisect?

Thanks,
Jeff.


------------[ cut here ]------------
kernel BUG at lib/kernel_lock.c:126!
invalid opcode: 0000 [#1] PREEMPT SMP
last sysfs file: /sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_max_freq
Modules linked in: 8250 serial_core sr_mod cdrom vmnet vmmon vmci
iwlagn iwlcore mac80211 cfg80211 [last unloaded: vmci]

Pid: 12074, comm: mount Not tainted (2.6.30 #2) 7676A24
EIP: 0060:[<c13bbae3>] EFLAGS: 00010286 CPU: 0
EIP is at unlock_kernel+0x10/0x3c
EAX: 00000000 EBX: f32d7400 ECX: f32d7494 EDX: f77b9810
ESI: f32d7400 EDI: 00000000 EBP: f2918f20 ESP: f2918f20
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process mount (pid: 12074, ti=f2918000 task=f77b9810 task.ti=f2918000)
Stack:
 f2918f38 c107522d 00000001 00000021 f32d7400 00000000 f2918f88 c1085f9b
 00000000 f2a40000 00000048 f32d743c 00000001 f15ec000 00000000 f2918f64
 00000021 f2918f90 c1084d00 f2a59000 00001000 f6d59880 f72da4c8 00000000
Call Trace:
 [<c107522d>] ? do_remount_sb+0x63/0xaa
 [<c1085f9b>] ? do_mount+0x1f8/0x63c
 [<c1084d00>] ? copy_mount_options+0x27/0x10d
 [<c108643e>] ? sys_mount+0x5f/0x96
 [<c1002990>] ? sysenter_do_call+0x12/0x2c
Code: 00 88 5a c1 0f 94 c2 0f b6 c2 85 c0 74 b8 64 a1 00 10 60 c1 89
70 14 5b 5e 5d c3 55 64 8b 15 00 10 60 c1 83 7a 14 00 89 e5 79 04 <0f>
0b eb fe 8b 42 14 48 85 c0 89 42 14 79 1b fe 05 00 88 5a c1
EIP: [<c13bbae3>] unlock_kernel+0x10/0x3c SS:ESP 0068:f2918f20
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