Date: Sun, 25 Feb 2007 00:41:44 -0500 From: "Alexandre \"Sunny\" Kovalenko" <alex.kovalenko@verizon.net> To: Kostik Belousov <kostikbel@gmail.com> Cc: current@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: -CURRENT panics on intensive fs operations. Message-ID: <1172382104.17603.2.camel@twinhead.rabbitslawn.verizon.net> In-Reply-To: <20070224195540.GB77131@deviant.kiev.zoral.com.ua> References: <1171414959.906.16.camel@RabbitsDen.RabbitsLawn.verizon.net> <20070214011755.GA73381@xor.obsecurity.org> <1171500531.780.6.camel@RabbitsDen.RabbitsLawn.verizon.net> <20070215011400.GA10455@xor.obsecurity.org> <1171982928.751.1.camel@RabbitsDen.RabbitsLawn.verizon.net> <1172156865.848.14.camel@RabbitsDen.RabbitsLawn.verizon.net> <20070224195540.GB77131@deviant.kiev.zoral.com.ua>
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On Sat, 2007-02-24 at 21:55 +0200, Kostik Belousov wrote: > On Thu, Feb 22, 2007 at 10:07:45AM -0500, Alexandre Sunny Kovalenko wrote: > > On Tue, 2007-02-20 at 09:48 -0500, Alexandre "Sunny" Kovalenko wrote: > > > On Wed, 2007-02-14 at 20:14 -0500, Kris Kennaway wrote: > > > > On Wed, Feb 14, 2007 at 07:48:51PM -0500, Alexandre Sunny Kovalenko wrote: > > > > > On Tue, 2007-02-13 at 20:17 -0500, Kris Kennaway wrote: > > > > > > On Tue, Feb 13, 2007 at 08:02:39PM -0500, Alexandre Sunny Kovalenko wrote: > > > > > > > I can reliably panic -CURRENT (Feb 11, noon EST) with the something that > > > > > > > excersises the file system. I have currently settled on (cd /usr/ports; > > > > > > > make clean), but it all started out as doing some "emerges" to test the > > > > > > > latest linuxolator. In the case of the "make clean" I have seen it > > > > > > > crashing as early as /usr/ports/audio and as late > > > > > > > as /usr/ports/textproc. > > > > > > > > > I am still not capable to get good backtrace from the kernel dump, but I > > have managed to hook up remote console to this machine, so here are > > results: > > > > db> bt > > Tracing pid 33 tid 100032 td 0xc4cee510 > > kdb_enter(c067c69d) at kdb_enter+0x2b > > panic(c0667ba3,c306d5c0,c306d5c0,e38a2cfc,c0619fd9,...) at panic+0x11c > > vm_pageq_remove_nowakeup(c306d5c0,c061a0b8,e38a2d04,c061a0ee,e38a2d24,...) at vm_pageq_remove_nowakeup+0x35 > > vm_page_zero_idle(e38a2d24,c04c7fe4,0,e38a2d38,c4ef8900,...) at > > vm_page_zero_idle+0x49 > > vm_pagezero(0,e38a2d38) at vm_pagezero+0x36 > > fork_exit(c061a0b8,0,e38a2d38) at fork_exit+0xac > > fork_trampoline() at fork_trampoline+0x8 > > --- trap 0, eip = 0, esp = 0xe38a2d70, ebp = 0 --- > > db> ps > > pid ppid pgrp uid state wmesg wchan cmd > > <snip> > > 33 0 0 0 RL CPU 0 [pagezero] > > <snip> > > > > ... and (hopefully) relevant bits from the source > > (kgdb) list *vm_pageq_remove_nowakeup+0x35 > > 0xc06192f9 is in vm_pageq_remove_nowakeup > > (/usr/src/sys/vm/vm_pageq.c:223). > > 218 struct vpgqueues *pq; > > 219 > > 220 if (queue != PQ_NONE) { > > 221 pq = &vm_page_queues[queue]; > > 222 VM_PAGE_SETQUEUE2(m, PQ_NONE); > > 223 TAILQ_REMOVE(&pq->pl, m, pageq); > There, please, show the output of "p/x *m" and "p/x *pq". > Unfortunately, with the latest -CURRENT the end result is different: Kernel page fault with the following non-sleepable locks held: exclusive sleep mutex sellck r = 0 (0xc0741284) locked @ /usr/src/sys/kern/sys_generic.c:776 KDB: stack backtrace: db_trace_self_wrapper(c067f599) at db_trace_self_wrapper+0x25 kdb_backtrace(1,c4fb46c0,c,e5447ab4,e5447aa8,...) at kdb_backtrace+0x29 witness_warn(5,0,c069ed6f) at witness_warn+0x192 trap(e5447ab4) at trap+0x10f calltrap() at calltrap+0x6 --- trap 0xc, eip = 0x80bfe48d, esp = 0xe5447af4, ebp = 0xe5447c54 --- kernload(c4e02d80,5,bfbfedb0,0,bfbfedb0,...) at -0x7f401b73 select(c4e02d80,e5447d00) at select+0x44 syscall(e5447d38) at syscall+0x256 Xint0x80_syscall() at Xint0x80_syscall+0x20 --- syscall (93, FreeBSD ELF32, select), eip = 0x2815f273, esp = 0xbfbfe82c, ebp = 0xbfbfee48 --- Fatal trap 12: page fault while in kernel mode cpuid = 0; apic id = 00 fault virtual address = 0x80bfe48d fault code = supervisor read, page not present instruction pointer = 0x20:0x80bfe48d stack pointer = 0x28:0xe5447af4 frame pointer = 0x28:0xe5447c54 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 520 (powerd) [thread pid 520 tid 100052 ] Stopped at -0x7f401b73: *** error reading from address 80bfe48d *** db> db> where Tracing pid 520 tid 100052 td 0xc4e02d80 kern_select(c4e02d80,5,bfbfedb0,0,bfbfedb0,...) at kern_select+0x4e5 select(c4e02d80,e5447d00) at select+0x44 syscall(e5447d38) at syscall+0x256 Xint0x80_syscall() at Xint0x80_syscall+0x20 --- syscall (93, FreeBSD ELF32, select), eip = 0x2815f273, esp = 0xbfbfe82c, ebp = 0xbfbfee48 --- db> what should I look for here? -- Alexandre "Sunny" Kovalenko
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