Fatal trap 12: page fault while in kernel mode

[Kai Storbeck]

Hi all,

Somewhere our IMAP software triggers this panic, and after some 
searching on my part I've found this report: kern/113823
  (http://www.freebsd.org/cgi/query-pr.cgi?pr=113823&cat=kern)

The software I am running is Dovecot serving IMAP to endusers and 
webmail clients.

Perhaps one of the mutex hackers can dive into this problem, I can help 
with more details if needed.


Kind regards,
Kai


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Unread portion of the kernel message buffer:
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 06
fault virtual address   = 0x104E
fault code              = supervisor read, page not presentx
instruction pointer     = 0x20:0xc0668f3dp
stack pointer           = 0x28:0xe8916c70e
frame pointer           = 0x28:0xe8916c7cn
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0s
current process         = 9 (thread taskq)i
trap number             = 12v
panic: page faulte
cpuid = 2
timeout(9) function: 0xc071a560(0) 0.028705867 s
Uptime: 2d20h58m42s
Dumping 3327 MB (2 chunks)
   chunk 0: 1MB (154 pages) ... ok
   chunk 1: 3327MB (851568 pages) 3311 3295 3279 3263 3247 3231 3215 
3199 3183 3167 3151 3135 3119 3103 3087 3071 3055 3039 3023 3007 2991 
2975 2959 2943 2927 2911 2895 2879 2863 2847 2831 2815 2799 2783 2767 
2751 2735 2719 2703 2687 2671 2655 2639 2623 2607 2591 2575 2559 2543 
2527 2511 2495 2479 2463 2447 2431 2415 2399 2383 2367 2351 2335 2319 
2303 2287 2271 2255 2239 2223 2207 2191 2175 2159 2143 2127 2111 2095 
2079 2063 2047 2031 2015 1999 1983 1967 1951 1935 1919 1903 1887 1871 
1855 1839 1823 1807 1791 1775 1759 1743 1727 1711 1695 1679 1663 1647 
1631 1615 1599 1583 1567 1551 1535 1519 1503 1487 1471 1455 1439 1423 
1407 1391 1375 1359 1343 1327 1311 1295 1279 1263 1247 1231 1215 1199 
1183 1167 1151 1135 1119 1103 1087 1071 1055 1039 1023 1007 991 975 959 
943 927 911 895 879 863 847 831 815 799 783 767 751 735 719 703 687 671 
655 639 623 607 591 575 559 543 527 511 495 479 463 447 431 415 399 383 
367 351 335 319 303 287 271 255 239 223 207 191 175 159 143 127 111 95 
79 63 47 31 15

#0  doadump () at pcpu.h:165
165     pcpu.h: No such file or directory.
         in pcpu.h
(kgdb) bt
#0  doadump () at pcpu.h:165
#1  0xc0670918 in boot (howto=260) at ../../../kern/kern_shutdown.c:409
#2  0xc0670bfa in panic (fmt=0xc08d0a0d "%s")
     at ../../../kern/kern_shutdown.c:565
#3  0xc087819c in trap_fatal (frame=0xe8916c30, eva=260)
     at ../../../i386/i386/trap.c:837
#4  0xc087794a in trap (frame=
       {tf_fs = -393150456, tf_es = -1064959960, tf_ds = -393150424, 
tf_edi = -935090688, tf_esi = -900488032, tf_ebp = -393122692, tf_isp = 
-393122724, tf_ebx = 4, tf_edx = 6, tf_ecx = 2, tf_eax = 1, tf_trapno = 
12, tf_err = 0, tf_eip = -1067020483, tf_cs = 32, tf_eflags = 65538, 
tf_esp = 1714, tf_ss = -1064340051})
     at ../../../i386/i386/trap.c:270
#5  0xc08649ea in calltrap () at ../../../i386/i386/exception.s:139
#6  0xc0668f3d in _mtx_lock_sleep (m=0xca53a4a0, tid=3359876608, opts=0,
     file=0xc08f75ad "../../../kern/uipc_usrreq.c", line=1714)
     at ../../../kern/kern_mutex.c:546
#7  0xc0668b93 in _mtx_lock_flags (m=0x2, opts=0,
     file=0xc08f75ad "../../../kern/uipc_usrreq.c", line=1714)
     at ../../../kern/kern_mutex.c:288
#8  0xc06b204b in unp_gc (arg=0x0, pending=1)
     at ../../../kern/uipc_usrreq.c:1714
#9  0xc068f7c0 in taskqueue_run (queue=0xc843ca80)
     at ../../../kern/subr_taskqueue.c:257
#10 0xc068fb3e in taskqueue_thread_loop (arg=0x1)
     at ../../../kern/subr_taskqueue.c:376
#11 0xc065d184 in fork_exit (callout=0xc068faf4 <taskqueue_thread_loop>,
     arg=0xc09df4e8, frame=0xe8916d38) at ../../../kern/kern_fork.c:821
#12 0xc0864a4c in fork_trampoline () at ../../../i386/i386/exception.s:208
(kgdb)

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