ia64 r235474 panic preceded by LOR : exclusive sleep mutex vnode interlock (vnode interlock)panic: blockable sleep lock (sleep mutex) process lock @ /usr/src/sys/ia64/ia64/trap.c:562

[Anton Shterenlikht]

# dump -0aLuf - / | restore -rf -

produces this panic:


lock order reversal:
 1st 0xa00000009ca034f8 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2652
 2nd 0xe00000001163ebb0 snaplk (snaplk) @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:2297
KDB: stack backtrace:
getenv with the following non-sleepable locks held:
exclusive sleep mutex vnode interlock (vnode interlock) r = 0 (0xe0000000116c78c0) locked @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:2257
KDB: stack backtrace:
getenv with the following non-sleepable locks held:
exclusive sleep mutex vnode interlock (vnode interlock) r = 0 (0xe0000000116c78c0) locked @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:2257
KDB: stack backtrace:
getenv with the following non-sleepable locks held:
exclusive sleep mutex vnode interlock (vnode interlock) r = 0 (0xe0000000116c78c0) locked @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:2257
KDB: stack backtrace:
getenv with the following non-sleepable locks held:
exclusive sleep mutex vnode interlock (vnode interlock) r = 0 (0xe0000000116c78c0) locked @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:2257
KDB: stack backtrace:
getenv with the following non-sleepable locks held:
exclusive sleep mutex vnode interlock (vnode interlock) r = 0 (0xe0000000116c78c0) locked @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:2257
KDB: stack backtrace:
getenv with the following non-sleepable locks held:
exclusive sleep mutex vnode interlock (vnode interlock)panic: blockable sleep lock (sleep mutex) process lock @ /usr/src/sys/ia64/ia64/trap.c:562
cpuid = 1
KDB: enter: panic
[ thread pid 956 tid 100089 ]
Stopped at      kdb_enter+0x92: [I2]    addl r14=0xffffffffffe25000,gp ;;
db>
db> show thread
Thread 100089 at 0xe000000011f25140:
 proc (pid 956): 0xe000000011d8b6a8
 name: dump
 stack: 0xa0000000f87a4000-0xa0000000f87abfff
 flags: 0x10004  pflags: 0
 state: RUNNING (CPU 1)
 priority: 120
 container lock: sched lock 1 (0x9ffc000000d8b8c0)
db> 
db> thread 100089
[ thread pid 956 tid 100089 ]
kdb_enter+0x92: [I2]    addl r14=0xffffffffffe25000,gp ;;
db> bt
Tracing pid 956 tid 100089 td 0xe000000011f25140
kdb_enter(0x9ffc000000c52c38, 0x9ffc000000c52c38, 0x9ffc0000004eb6b0, 0x793) at kdb_enter+0x92
panic(0x9ffc000000c5b748, 0x9ffc000000c50f60, 0x9ffc000000c50f40, 0x9ffc000000c93830, 0x232, 0x9ffc000000c93830) at panic+0x420
witness_checkorder(0xe000000011d8b7a0, 0x9, 0x9ffc000000c93830, 0x232, 0x0) at witness_checkorder+0x1b0
_mtx_lock_flags(0xe000000011d8b7a0, 0x0, 0x9ffc000000c93830, 0x232, 0x9ffc00000097dcc0, 0x716, 0x0) at _mtx_lock_flags+0x160
trap(0x14, 0xa0000000f87a5800) at trap+0x940
ivt_Data_TLB() at ivt_Data_TLB+0x1d0
--- trapframe at 0xa0000000f87a5800
ia64_handle_intr(0xa0000000f87a5c00) at ia64_handle_intr+0x171
ivt_External_Interrupt() at ivt_External_Interrupt+0x30
--- trapframe at 0xa0000000f87a5c00
__gp(...) at __gp
db> 

-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 331 5944
Fax: +44 (0)117 929 4423