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Subject2.6.0-test2: resiserfs BUG on Alt-SysRq-U

this has been around since 2.5.75 at least and may be before it as well.


sh-2.05b# SysRq : Emergency Remount R/O
------------[ cut here ]------------
kernel BUG at fs/reiserfs/journal.c:409!
invalid operand: 0000 [#1]
CPU: 0
EIP: 0060:[<d187081a>] Not tainted
EFLAGS: 00010246
EIP is at reiserfs_check_lock_depth+0x2a/0x40 [reiserfs]
eax: 00000000 ebx: cf369004 ecx: 00000000 edx: ffffcc00
esi: cf369004 edi: cf721f78 ebp: cf721eb4 esp: cf721eac
ds: 007b es: 007b ss: 0068
Process pdflush (pid: 7, threadinfo=cf720000 task=cf749000)
Stack: d187bae0 d187ecb3 cf721ef0 d187375e d187ecb3 3f2e87df 00000000 00000000
d187e847 00000077 00000000 00000000 00000000 00000000 cf369004 cf28d000
cf721f78 cf721f08 d1873a46 cf721f24 cf369004 0000000a 00000000 cf721f50
Call Trace:
[<d187375e>] do_journal_begin_r+0x1e/0x2d0 [reiserfs]
[<d1873a46>] journal_begin+0x16/0x20 [reiserfs]
[<d1864310>] reiserfs_remount+0xb0/0x1d0 [reiserfs]
[<c01662fe>] sync_blockdev+0x2e/0x40
[<c016c4ec>] do_remount_sb+0xac/0x110
[<c016c6b6>] do_emergency_remount+0x166/0x1b0
[<c01494fe>] __pdflush+0x16e/0x390
[<c011f37f>] schedule_tail+0xbf/0xe0
[<c0149720>] pdflush+0x0/0x20
[<c014972f>] pdflush+0xf/0x20
[<c016c550>] do_emergency_remount+0x0/0x1b0
[<c0109029>] kernel_thread_helper+0x5/0xc

Code: 0f 0b 99 01 d9 eb 87 d1 58 5a eb dd 8d 76 00 8d bc 27 00 00

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