Date: Fri, 29 Jun 2012 11:58:31 +0100 From: Anton Shterenlikht <mexas@bristol.ac.uk> To: freebsd-current@freebsd.org, freebsd-ia64@freebsd.org Subject: 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 Message-ID: <20120629105831.GA18531@mech-cluster241.men.bris.ac.uk>
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# 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
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