LOR #261

[Anton Shterenlikht]

FreeBSD 8.0-BETA1 ia64

LOR below looks like LOR #261, but the line numbers are different.

What does state "cannot deadlock" mean in your table?

many thanks
anton

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lock order reversal:
 1st 0xa00000001e5adcf0 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2558
 2nd 0xe000000010866a00 dirhash (dirhash) @ /usr/src/sys/ufs/ufs/ufs_dirhash.c:285
KDB: stack backtrace:
db_trace_self(0xe000000004135d60) at db_trace_self+0x20
db_trace_self_wrapper(0xe00000000443add0) at db_trace_self_wrapper+0x70
kdb_backtrace(0xe0000000049da960, 0xe0000000044639d0) at kdb_backtrace+0xc0
_witness_debugger(0x1, 0xe000000004888610, 0xe000000004465270, 0x999, 0xe0000000048ac640) at _witness_debugger+0x60
witness_checkorder(0xe000000010866a00, 0x9, 0xffffffffffffffff, 0x11d, 0x0) at witness_checkorder+0x12c0
_sx_xlock(0xe000000010866a00, 0x0, 0xe0000000048ac640, 0x11d) at _sx_xlock+0xc0
ufsdirhash_acquire(0xe000000010a9a348, 0xe000000010866a00, 0xe00000000477eaf0, 0x38b) at ufsdirhash_acquire+0x50
ufsdirhash_remove(0xe000000010a9a348, 0xa00000001f760018, 0x18, 0xa000000032b45308) at ufsdirhash_remove+0x20
ufs_dirremove(0xe000000010b46760, 0xe000000010a39d88, 0x0, 0x0) at ufs_dirremove+0x240
ufs_remove(0xa000000032b453d8, 0xe000000010a39d88, 0xe0000000045096f0) at ufs_remove+0xe0
VOP_REMOVE_APV(0xe0000000049acdd0, 0xa000000032b453d8, 0xe000000010b459d0, 0xe000000004509760) at VOP_REMOVE_APV+0x1c0
kern_unlinkat(0xe000000010850b10, 0xffffffffffffff9c, 0x200000004041b048, 0x0) at kern_unlinkat+0x2f0
kern_unlink(0xe000000010850b10, 0x200000004041b048, 0x0) at kern_unlink+0x30
unlink(0xe000000010850b10, 0xa000000032b454e8, 0xe0000000048283e0, 0x58f) at unlink+0x30
syscall(0xa000000032b45400, 0xa, 0x200000004041af40, 0xe000000010850b10, 0xe000000010848cd8, 0xe000000004982690, 0xa, 0xa000000032b454e8) at syscall+0x3e0
epc_syscall_return() at epc_syscall_return

-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 928 8233 
Fax: +44 (0)117 929 4423