kern/111458: [panic] Panic on 6.2-RELEASE AMD in kern_mutex

Remco Bressers remco at signet.nl
Mon May 7 09:42:33 UTC 2007


> > > > > > > >  To update this bugreport and to keep it 'warm'
> > > > > > > >  
> > > > > > > >  I've got the very same problem overhere.
> > > > > > > >  
> > > > > > > >  Our box : 
> > > > > > > >  
> > > > > > > >  # uname -r
> > > > > > > >  6.2-RELEASE-p2
> > > > > > > >  
> > > > > > > >  This is an amd64 release
> > > > > > > >  
> > > > > > > >  Updates on GENERIC : 
> > > > > > > >  
> > > > > > > >  options         QUOTA 
> > > > > > > >  device          pf
> > > > > > > >  device          pflog
> > > > > > > >  options		SMP
> > > > > > > >  
> > > > > > > >  Kernel messages : 
> > > > > > > >  
> > > > > > > >  cpuid = 0; apic id = 00
> > > > > > > >  fault virtual address = 0x18c
> > > > > > > >  fault code = supervisor read, page not present
> > > > > > > >  current process = 5 (thread taskq)
> > > > > > > >  trap number = 12
> > > > > > > >  panic: page fault
> > > > > > > >  cpuid = 0
> > > > > > > 
> > > > > > > How do you know it is "the very same problem"?  In order to determine
> > > > > > > this you need to compare backtraces from the panic, which you didn't
> > > > > > > provide.
> > > > > > 
> > > > > > I contacted the submitter for this problem and compared hardware and
> > > > > > software. The symptoms are the same
> > > > > 
> > > > > Which just means "it crashed"
> > > > > 
> > > > > , the kernel panic is the same and
> > > > > 
> > > > > The panic message also just means "it crashed"
> > > > > 
> > > > > > the installed FreeBSD version is exactly the same.
> > > > > 
> > > > > You're both running the most recent version, no real surprises there.
> > > > > 
> > > > > > Sounds fair enough to me.  Ofcourse i cannot be 100% sure, but it
> > > > > > sounds too obvious to me.
> > > > > 
> > > > > Well, maybe, but I respectfully submit that you don't understand the
> > > > > issue well enough to conclude that :) Please follow up with a
> > > > > backtrace and then we'll see where things stand.
> > > > 
> > > > You didn't write anything about the fact that software combinations +
> > > > hardware is almost identical! That's no coincidence in my humble
> > > > opinion :). Anyway..
> > > 
> > > I'd prefer not to prematurely jump to conclusions before you have any
> > > supporting evidence.  It is of course an obviously true statement that
> > > two identical systems may panic in two completely different and
> > > unrelated ways.
> > > 
> > > > The problem in this case is, that the backtrace isn't written to disk. I
> > > > must wait for the next opportunity to get that backtrace.
> > > 
> > > OK, let us know.

Hi Kris,

The crash just happened again and there's a dump in /var/crash now and
it's 2GB big :

joule# ls -l
total 2059510
-rw-r--r--  1 root  wheel           2 May  7 11:06 bounds
-rw-------  1 root  wheel         445 May  7 11:06 info.0
-rw-r--r--  1 root  wheel           5 Jan 12 08:13 minfree
-rw-------  1 root  wheel  2146025472 May  7 11:07 vmcore.0



I got the following output from kgdb : 

joule# kgdb kernel.debug /var/crash/vmcore.0
[GDB will not be able to debug user-mode
threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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:
panic: page fault
cpuid = 0
Uptime: 12d10h56m24s
Dumping 2046 MB (2 chunks)
  chunk 0: 1MB (155 pages) ... ok
  chunk 1: 2046MB (523776 pages) 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:172
172             __asm __volatile("movq %%gs:0,%0" : "=r" (td));

(kgdb) backtrace

#0  doadump () at pcpu.h:172
#1  0x0000000000000004 in ?? ()
#2  0xffffffff8021f787 in boot (howto=260)
at /usr/src/sys/kern/kern_shutdown.c:409
#3  0xffffffff8021fe21 in panic (fmt=0xffffff007b950720 "")
at /usr/src/sys/kern/kern_shutdown.c:565
#4  0xffffffff8035edcf in trap_fatal (frame=0xffffff007b950720,
eva=18446742976271278080) at /usr/src/sys/amd64/amd64/trap.c:660
#5  0xffffffff8035f2f6 in trap (frame=
      {tf_rdi = 24, tf_rsi = -1097438263520, tf_rdx = 6, tf_rcx =
3221225730, tf_r8 = -1315361520, tf_r9 = -1097438492872, tf_rax = 1,
tf_rbx = -1097589680120, tf_rbp = 4, tf_r10 = -2142164360, tf_r11 = 0,
tf_r12 = -1097438263520, tf_r13 = 4, tf_r14 = 1, tf_r15 = 20, tf_trapno
= 12, tf_addr = 396, tf_flags = -1097589680120, tf_err = 0, tf_rip =
-2145299289, tf_cs = 8, tf_rflags = 65538, tf_rsp = -1315361936, tf_ss =
16}) at /usr/src/sys/amd64/amd64/trap.c:238
#6  0xffffffff8034ac1b in calltrap ()
at /usr/src/sys/amd64/amd64/exception.S:168
#7  0xffffffff802154a7 in _mtx_lock_sleep (m=0xffffff00728e9808,
tid=18446742976271288096, opts=6, file=0xc0000102 <Address 0xc0000102
out of bounds>, 
    line=-1315361520) at /usr/src/sys/kern/kern_mutex.c:546
#8  0xffffffff8027256d in unp_gc (arg=0x18, pending=2073364256)
at /usr/src/sys/kern/uipc_usrreq.c:1714
#9  0xffffffff80245d65 in taskqueue_run (queue=0xffffff0000792c00)
at /usr/src/sys/kern/subr_taskqueue.c:257
#10 0xffffffff80246ab5 in taskqueue_thread_loop (arg=0x18)
at /usr/src/sys/kern/subr_taskqueue.c:376
#11 0xffffffff80206c47 in fork_exit (callout=0xffffffff80246a30
<taskqueue_thread_loop>, arg=0xffffffff8051a0b0,
frame=0xffffffffb1992c50)
    at /usr/src/sys/kern/kern_fork.c:821
#12 0xffffffff8034af7e in fork_trampoline ()
at /usr/src/sys/amd64/amd64/exception.S:394
#13 0x0000000000000000 in ?? ()
#14 0x0000000000000000 in ?? ()
#15 0x0000000000000001 in ?? ()
#16 0x0000000000000000 in ?? ()
#17 0x0000000000000000 in ?? ()
#18 0x0000000000000000 in ?? ()
#19 0x0000000000000000 in ?? ()
#20 0x0000000000000000 in ?? ()
#21 0x0000000000000000 in ?? ()
#22 0x0000000000000000 in ?? ()
#23 0x0000000000000000 in ?? ()
#24 0x0000000000000000 in ?? ()
#25 0x0000000000000000 in ?? ()
#26 0x0000000000000000 in ?? ()
#27 0x0000000000000000 in ?? ()
#28 0x0000000000000000 in ?? ()
#29 0x0000000000000000 in ?? ()
#30 0x0000000000000000 in ?? ()
#31 0x0000000000000000 in ?? ()
#32 0x0000000000000000 in ?? ()
#33 0x0000000000000000 in ?? ()
#34 0x0000000000000000 in ?? ()
#35 0x0000000000000000 in ?? ()
#36 0x0000000000000000 in ?? ()
#37 0x0000000000000000 in ?? ()
#38 0x0000000000000000 in ?? ()
#39 0x0000000000000000 in ?? ()
#40 0x0000000000000000 in ?? ()
#41 0x0000000000000000 in ?? ()
#42 0x0000000000000000 in ?? ()
#43 0x0000000000000000 in ?? ()
#44 0x0000000000000000 in ?? ()
#45 0x00000000006d6000 in ?? ()
#46 0xffffff00728e9808 in ?? ()
#47 0xffffffff8051a920 in turnstile_chains ()
#48 0x0000000000000001 in ?? ()
#49 0xffffff007b94e000 in ?? ()
#50 0xffffff007b950be0 in ?? ()
#51 0xffffffffb1992aa8 in ?? ()
#52 0xffffff007b950720 in ?? ()
#53 0xffffffff80234cc6 in sched_switch (td=0xffffffff8051a0b0,
newtd=0x0, flags=0) at /usr/src/sys/kern/sched_4bsd.c:973
#54 0x0000000000000000 in ?? ()
#55 0x0000000000000000 in ?? ()
#56 0x0000000000000000 in ?? ()
#57 0x0000000000000000 in ?? ()
#58 0x0000000000000000 in ?? ()
#59 0x0000000000000000 in ?? ()
#60 0x0000000000000000 in ?? ()
#61 0x0000000000000000 in ?? ()
#62 0x0000000000000000 in ?? ()
#63 0x0000000000000000 in ?? ()
#64 0x0000000000000000 in ?? ()
#65 0x0000000000000000 in ?? ()
#66 0x0000000000000000 in ?? ()
#67 0x0000000000000000 in ?? ()
#68 0x0000000000000000 in ?? ()
#69 0x0000000000000000 in ?? ()
#70 0x0000000000000000 in ?? ()
#71 0x0000000000000000 in ?? ()
#72 0x0000000000000000 in ?? ()
#73 0x0000000000000000 in ?? ()
#74 0x0000000000000000 in ?? ()
#75 0x0000000000000000 in ?? ()
#76 0x0000000000000000 in ?? ()
#77 0x0000000000000000 in ?? ()
#78 0x0000000000000000 in ?? ()
#79 0x0000000000000000 in ?? ()
#80 0x0000000000000000 in ?? ()
#81 0x0000000000000000 in ?? ()
#82 0x0000000000000000 in ?? ()
#83 0x0000000000000000 in ?? ()
#84 0x0000000000000000 in ?? ()
#85 0x0000000000000000 in ?? ()
#86 0x0000000000000000 in ?? ()
#87 0x0000000000000000 in ?? ()
#88 0x0000000000000000 in ?? ()
#89 0x0000000000000000 in ?? ()
#90 0x0000000000000000 in ?? ()
#91 0x0000000000000000 in ?? ()
#92 0x0000000000000000 in ?? ()
#93 0x0000000000000000 in ?? ()
#94 0x0000000000000000 in ?? ()
#95 0x0000000000000000 in ?? ()
#96 0x0000000000000000 in ?? ()
#97 0x0000000000000000 in ?? ()
#98 0x0000000000000000 in ?? ()
#99 0x0000000000000000 in ?? ()
#100 0x0000000000000000 in ?? ()
#101 0x0000000000000000 in ?? ()
#102 0x0000000000000000 in ?? ()
#103 0x0000000000000000 in ?? ()
#104 0x0000000000000000 in ?? ()
#105 0x0000000000000000 in ?? ()
#106 0x0000000000000000 in ?? ()
#107 0x0000000000000000 in ?? ()
#108 0x0000000000000000 in ?? ()
#109 0x0000000000000000 in ?? ()
#110 0x0000000000000000 in ?? ()
#111 0x0000000000000000 in ?? ()
#112 0x0000000000000000 in ?? ()
#113 0x0000000000000000 in ?? ()
#114 0x0000000000000000 in ?? ()
#115 0x0000000000000000 in ?? ()
#116 0x0000000000000000 in ?? ()
#117 0x0000000000000000 in ?? ()
#118 0x0000000000000000 in ?? ()
#119 0x0000000000000000 in ?? ()
#120 0x0000000000000000 in ?? ()
#121 0x0000000000000000 in ?? ()
#122 0x0000000000000000 in ?? ()
#123 0x0000000000000000 in ?? ()
#124 0x0000000000000000 in ?? ()
#125 0x0000000000000000 in ?? ()
Cannot access memory at address 0xffffffffb1993000


I hope this will be useful information.


Regards,

Remco Bressers
Signet B.V.





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