On Mon, Jun 24, 2013 at 02:21:56PM +0400, Gleb Smirnoff wrote: > On Fri, Jun 21, 2013 at 08:17:12PM -0400, Glen Barber wrote: > G> Hi, > G> > G> I have the following kgdb session from a page fault seemingly triggered > G> in pf(4). > > pfslowtimo() isn't related to pf(4). "pf" stands here for "protocol family". > Ah, thanks. > G> (kgdb) list *0xffffffff80772688 > G> 0xffffffff80772688 is in ip_slowtimo (/usr/src/sys/netinet/ip_input.c:1242). > G> 1237 for(fp = TAILQ_FIRST(&V_ipq[i]); fp;) { > G> 1238 struct ipq *fpp; > G> 1239 > G> 1240 fpp = fp; > G> 1241 fp = TAILQ_NEXT(fp, ipq_list); > G> 1242 if(--fpp->ipq_ttl == 0) { > G> 1243 IPSTAT_ADD(ips_fragtimeout, > G> 1244 fpp->ipq_nfrags); > G> 1245 ip_freef(&V_ipq[i], fpp); > G> 1246 } > G> (kgdb) p *ipq > G> $1 = {tqh_first = 0x0, tqh_last = 0xffffffff80e20e80} > > Can you please "print ipq", so that we can look at entire array. > Sure, output follows. Glen Script started on Mon Jun 24 06:28:36 2013 root_at_orion:/usr/obj/usr/src/sys/ORION # kgdb ./kernel.debug /var/crash/vmcore.8 GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "amd64-marcel-freebsd"... Unread portion of the kernel message buffer: Fatal trap 12: page fault while in kernel mode cpuid = 0; apic id = 00 fault virtual address = 0x11 fault code = supervisor read data, page not present instruction pointer = 0x20:0xffffffff80772688 stack pointer = 0x28:0xffffff800026da20 frame pointer = 0x28:0xffffff800026da40 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, long 1, def32 0, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 12 (swi4: clock) trap number = 12 panic: page fault cpuid = 0 KDB: stack backtrace: #0 0xffffffff80676a46 at kdb_backtrace+0x66 #1 0xffffffff8063ae6b at panic+0x13b #2 0xffffffff80918ba0 at trap_fatal+0x290 #3 0xffffffff80918f11 at trap_pfault+0x221 #4 0xffffffff809194c4 at trap+0x344 #5 0xffffffff80902c53 at calltrap+0x8 #6 0xffffffff806a29ce at pfslowtimo+0x2e #7 0xffffffff80651476 at softclock_call_cc+0x106 #8 0xffffffff80651b09 at softclock+0xa9 #9 0xffffffff8060c06d at intr_event_execute_handlers+0xfd #10 0xffffffff8060d81b at ithread_loop+0x9b #11 0xffffffff80608c1f at fork_exit+0x11f #12 0xffffffff8090317e at fork_trampoline+0xe Uptime: 42d1h53m40s (ada0:ahcich0:0:0:0): FLUSHCACHE48. ACB: ea 00 00 00 00 40 00 00 00 00 00 00 (ada0:ahcich0:0:0:0): CAM status: CCB request is in progress (ada0:ahcich0:0:0:0): Error 5, Retries exhausted (ada0:ahcich0:0:0:0): Synchronize cache failed (ada1:ahcich1:0:0:0): FLUSHCACHE48. ACB: ea 00 00 00 00 40 00 00 00 00 00 00 (ada1:ahcich1:0:0:0): CAM status: CCB request is in progress (ada1:ahcich1:0:0:0): Error 5, Retries exhausted (ada1:ahcich1:0:0:0): Synchronize cache failed (ada2:ahcich4:0:0:0): FLUSHCACHE48. ACB: ea 00 00 00 00 40 00 00 00 00 00 00 (ada2:ahcich4:0:0:0): CAM status: CCB request is in progress (ada2:ahcich4:0:0:0): Error 5, Retries exhausted (ada2:ahcich4:0:0:0): Synchronize cache failed (ada3:ahcich5:0:0:0): FLUSHCACHE48. ACB: ea 00 00 00 00 40 00 00 00 00 00 00 (ada3:ahcich5:0:0:0): CAM status: CCB request is in progress (ada3:ahcich5:0:0:0): Error 5, Retries exhausted (ada3:ahcich5:0:0:0): Synchronize cache failed Dumping 2263 out of 6048 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91% Reading symbols from /boot/kernel/zfs.ko.symbols...done. Loaded symbols for /boot/kernel/zfs.ko.symbols Reading symbols from /boot/kernel/opensolaris.ko.symbols...done. Loaded symbols for /boot/kernel/opensolaris.ko.symbols #0 doadump (textdump=<value optimized out>) at pcpu.h:231 231 __asm("movq %%gs:%1,%0" : "=r" (td) (kgdb) p ipq $1 = {{tqh_first = 0x0, tqh_last = 0xffffffff80e20e80}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20e90}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20ea0}, { tqh_first = 0x0, tqh_last = 0xffffffff80e20eb0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20ec0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20ed0}, { tqh_first = 0x0, tqh_last = 0xffffffff80e20ee0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20ef0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20f00}, { tqh_first = 0x0, tqh_last = 0xffffffff80e20f10}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20f20}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20f30}, { tqh_first = 0x0, tqh_last = 0xffffffff80e20f40}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20f50}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20f60}, { tqh_first = 0x0, tqh_last = 0xffffffff80e20f70}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20f80}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20f90}, { tqh_first = 0x0, tqh_last = 0xffffffff80e20fa0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20fb0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20fc0}, { tqh_first = 0x0, tqh_last = 0xffffffff80e20fd0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20fe0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e20ff0}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21000}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21010}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21020}, { tqh_first = 0x1, tqh_last = 0xffffffff80e21030}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21040}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21050}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21060}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21070}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21080}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21090}, {tqh_first = 0x0, ---Type <return> to continue, or q <return> to quit--- tqh_last = 0xffffffff80e210a0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e210b0}, { tqh_first = 0x0, tqh_last = 0xffffffff80e210c0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e210d0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e210e0}, { tqh_first = 0x0, tqh_last = 0xffffffff80e210f0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21100}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21110}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21120}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21130}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21140}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21150}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21160}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21170}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21180}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21190}, {tqh_first = 0x0, tqh_last = 0xffffffff80e211a0}, { tqh_first = 0x0, tqh_last = 0xffffffff80e211b0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e211c0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e211d0}, { tqh_first = 0x0, tqh_last = 0xffffffff80e211e0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e211f0}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21200}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21210}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21220}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21230}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21240}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21250}, {tqh_first = 0x0, tqh_last = 0xffffffff80e21260}, { tqh_first = 0x0, tqh_last = 0xffffffff80e21270}} (kgdb) quit root_at_orion:/usr/obj/usr/src/sys/ORION # ^D Script done on Mon Jun 24 06:28:46 2013
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