This seems to be happening often to me :( FreeBSD 9.0-CURRENT #2 r200661: Fri Dec 18 Kernel page fault with the following non-sleepable locks held: exclusive sleep mutex vm page queue free mutex (vm page queue free mutex) r = 0 (0xc0f65280) locked _at_ /usr/src/sys/vm/vm_page.c:1052 exclusive sleep mutex vm object (standard object) r = 0 (0xc207bee0) locked _at_ /usr/src/sys/vm/vm_fault.c:269 KDB: stack backtrace: db_trace_self_wrapper(c0c94824,e8986954,c08ceab5,c0cba8a5,10d,...) at db_trace_self_wrapper+0x26 kdb_backtrace(c0cba8a5,10d,ffffffff,c0f2bbfc,e898698c,...) at kdb_backtrace+0x29 _witness_debugger(c0c96cd9,e89869a0,4,1,0,...) at _witness_debugger+0x25 witness_warn(5,0,c0ccb229,c0df122c,c69e6d48,...) at witness_warn+0x1fd trap(e8986a2c) at trap+0x19e calltrap() at calltrap+0x6 --- trap 0xc, eip = 0xc0afd732, esp = 0xe8986a6c, ebp = 0xe8986ac0 --- vm_reserv_alloc_page(c207bee0,58a5,0,37e,c207bee0,...) at vm_reserv_alloc_page+0x102 vm_page_alloc(c207bee0,58a5,0,40,e8986c0c,...) at vm_page_alloc+0x25e vm_fault(c684c1d0,2e129000,2,0,2e129000,...) at vm_fault+0x575 trap_pfault(5,0,c0ccb229,2f0,c69e6d48,...) at trap_pfault+0x10d trap(e8986d38) at trap+0x2d0 calltrap() at calltrap+0x6 --- trap 0xc, eip = 0x2834ecba, esp = 0xbfbfe454, ebp = 0xbfbfe468 --- Fatal trap 12: page fault while in kernel mode cpuid = 3; apic id = 03 fault virtual address = 0xc445cf80 fault code = supervisor read, page not present instruction pointer = 0x20:0xc0afd732 stack pointer = 0x28:0xe8986a6c frame pointer = 0x28:0xe8986ac0 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, resume, IOPL = 3 current process = 1430 (initial thread) [thread pid 1430 tid 100141 ] Stopped at vm_reserv_alloc_page+0x102: cmpl %eax,0x10(%esi) db> lock order reversal: (Giant after non-sleepable) 1st 0xc0f65280 vm page queue free mutex (vm page queue free mutex) _at_ /usr/src/sys/vm/vm_page.c:1052 2nd 0xc0debed0 Giant (Giant) _at_ /usr/src/sys/dev/usb/input/ukbd.c:1594 KDB: stack backtrace: db_trace_self_wrapper(c0c94824,e89867a4,c08ceab5,c08bf76b,c0c9772d,...) at db_trace_self_wrapper+0x26 kdb_backtrace(c08bf76b,c0c9772d,c612a6c0,c61291a0,e8986800,...) at kdb_backtrace+0x29 _witness_debugger(c0c9772d,c0debed0,c0cb35e2,c61291a0,c0c82ff1,...) at _witness_debugger+0x25 witness_checkorder(c0debed0,9,c0c82ff1,63a,0,...) at witness_checkorder+0x839 _mtx_lock_flags(c0debed0,0,c0c82ff1,63a,c6730c60,...) at _mtx_lock_flags+0xc4 ukbd_poll(c68fc000,1,c6763000,1,e8986880,...) at ukbd_poll+0x48 kbdmux_poll(c6186200,1,c6763084,c0deab48,1,...) at kbdmux_poll+0x46 sc_cngetc(c0d39220,78,e8986898,c084c066,e89868b8,...) at sc_cngetc+0xc3 cncheckc(e89868b8,c04d1bc5,c0c3a16c,c04d2e70,e89868b4,...) at cncheckc+0x3a cngetc(c0c3a16c,c04d2e70,e89868b4,e89868f0,1,...) at cngetc+0x16 db_readline(c0dba260,78,e89868d4,c04d0806,c0c3a16c,...) at db_readline+0x75 db_read_line(c0c3a16c,e8986928,c04d26bd,c0cc7338,2,...) at db_read_line+0x1a db_command_loop(c0cc7338,2,0,e898690c,0,...) at db_command_loop+0x46 db_trap(c,0,7,28,e8986a2c,...) at db_trap+0xdd kdb_trap(c,0,e8986a2c,1,1,...) at kdb_trap+0x96 trap_fatal(5,0,c0ccb229,c0df122c,c69e6d48,...) at trap_fatal+0x2ef trap(e8986a2c) at trap+0x1ac calltrap() at calltrap+0x6 --- trap 0xc, eip = 0xc0afd732, esp = 0xe8986a6c, ebp = 0xe8986ac0 --- vm_reserv_alloc_page(c207bee0,58a5,0,37e,c207bee0,...) at vm_reserv_alloc_page+0x102 vm_page_alloc(c207bee0,58a5,0,40,e8986c0c,...) at vm_page_alloc+0x25e vm_fault(c684c1d0,2e129000,2,0,2e129000,...) at vm_fault+0x575 trap_pfault(5,0,c0ccb229,2f0,c69e6d48,...) at trap_pfault+0x10d trap(e8986d38) at trap+0x2d0 calltrap() at calltrap+0x6 --- trap 0xc, eip = 0x2834ecba, esp = 0xbfbfe454, ebp = 0xbfbfe468 --- db> bt Tracing pid 1430 tid 100141 td 0xc69d56c0 vm_reserv_alloc_page(c207bee0,58a5,0,37e,c207bee0,...) at vm_reserv_alloc_page+0x102 vm_page_alloc(c207bee0,58a5,0,40,e8986c0c,...) at vm_page_alloc+0x25e vm_fault(c684c1d0,2e129000,2,0,2e129000,...) at vm_fault+0x575 trap_pfault(5,0,c0ccb229,2f0,c69e6d48,...) at trap_pfault+0x10d trap(e8986d38) at trap+0x2d0 calltrap() at calltrap+0x6 --- trap 0xc, eip = 0x2834ecba, esp = 0xbfbfe454, ebp = 0xbfbfe468 --- db> db> show pcpu 0 cpuid = 0 dynamic pcpu = 0xe6d380 curthread = 0xc69f96c0: pid 757 "syslogd" curpcb = 0xe8970d90 fpcurthread = none idlethread = 0xc6181480: pid 11 "idle: cpu0" APIC ID = 0 currentldt = 0x50 spin locks held: db> db> show pcpu 1 cpuid = 1 dynamic pcpu = 0x51fa380 curthread = 0xc6e39b40: pid 1679 "VirtualBox" curpcb = 0xeac7ad90 fpcurthread = none idlethread = 0xc61816c0: pid 11 "idle: cpu1" APIC ID = 1 currentldt = 0x50 spin locks held: db> db> show pcpu 2 cpuid = 2 dynamic pcpu = 0x51fd380 curthread = 0xc6181900: pid 11 "idle: cpu2" curpcb = 0xc5fd5d90 fpcurthread = none idlethread = 0xc6181900: pid 11 "idle: cpu2" APIC ID = 2 currentldt = 0x50 spin locks held: db> db> show pcpu 3 cpuid = 3 dynamic pcpu = 0x5200380 curthread = 0xc69d56c0: pid 1430 "initial thread" curpcb = 0xe8986d90 fpcurthread = 0xc69d56c0: pid 1430 "initial thread" idlethread = 0xc6181b40: pid 11 "idle: cpu3" APIC ID = 3 currentldt = 0x50 spin locks held: db> db> show lockedvnods Locked vnodes 0xc69c1660: tag ufs, type VDIR usecount 1, writecount 0, refcount 3 mountedhere 0 flags () v_object 0xc690e7f8 ref 0 pages 1 lock type ufs: SHARED (count 1) ino 1719306, on dev ad8s2a 0xc79a6880: tag ufs, type VREG usecount 2, writecount 1, refcount 3 mountedhere 0 flags () v_object 0xc75e9220 ref 0 pages 0 lock type ufs: EXCL by thread 0xc69f96c0 (pid 757) with shared waiters pending ino 1719630, on dev ad8s2a db> db> show locks exclusive sleep mutex vm page queue free mutex (vm page queue free mutex) r = 0 (0xc0f65280) locked _at_ /usr/src/sys/vm/vm_page.c:1052 exclusive sleep mutex vm object (standard object) r = 0 (0xc207bee0) locked _at_ /usr/src/sys/vm/vm_fault.c:269 shared sx user map (user map) r = 0 (0xc684c218) locked _at_ /usr/src/sys/vm/vm_map.c:3532 db> db> panic panic: from debugger cpuid = 3 KDB: stack backtrace: db_trace_self_wrapper(c0c94824,e8986768,c08948dd,c0df1880,0,...) at db_trace_self_wrapper+0x26 kdb_backtrace(c0df1880,0,c0c91e85,17b,c69d56c0,...) at kdb_backtrace+0x29 mi_switch(100,0,c0c92f4a,98c,3,...) at mi_switch+0x12d sched_bind(c69d56c0,0,c0c91293,118,e89867cc,...) at sched_bind+0x8a boot(c0c913d9,c0c913d9,c0c3a0bd,e8986804,3,...) at boot+0x47 panic(c0c3a0bd,e89868c8,c04d06c1,3,0,...) at panic+0x152 db_panic(3,0,ffffffff,e8986840,1,...) at db_panic+0x17 db_command(c0c3a16c,e8986928,c04d26bd,c0cc7338,2,...) at db_command+0x381 db_command_loop(c0cc7338,2,0,e898690c,0,...) at db_command_loop+0x5a db_trap(c,0,7,28,e8986a2c,...) at db_trap+0xdd kdb_trap(c,0,e8986a2c,1,1,...) at kdb_trap+0x96 trap_fatal(5,0,c0ccb229,c0df122c,c69e6d48,...) at trap_fatal+0x2ef trap(e8986a2c) at trap+0x1ac calltrap() at calltrap+0x6 --- trap 0xc, eip = 0xc0afd732, esp = 0xe8986a6c, ebp = 0xe8986ac0 --- vm_reserv_alloc_page(c207bee0,58a5,0,37e,c207bee0,...) at vm_reserv_alloc_page+0x102 vm_page_alloc(c207bee0,58a5,0,40,e8986c0c,...) at vm_page_alloc+0x25e vm_fault(c684c1d0,2e129000,2,0,2e129000,...) at vm_fault+0x575 trap_pfault(5,0,c0ccb229,2f0,c69e6d48,...) at trap_pfault+0x10d trap(e8986d38) at trap+0x2d0 calltrap() at calltrap+0x6 --- trap 0xc, eip = 0x2834ecba, esp = 0xbfbfe454, ebp = 0xbfbfe468 --- db> -Alex IMPORTANT: This email remains the property of the Australian Defence Organisation and is subject to the jurisdiction of section 70 of the CRIMES ACT 1914. 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