kern/114216: aio when using dt panic: lock "aiomtx" 0xc473f1f0 already initialized

[Kirk Russell]

The following reply was made to PR kern/114216; it has been noted by GNATS.

From: Kirk Russell <kirk at ba23.org>
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: kern/114216: aio when using dt panic: lock "aiomtx" 0xc473f1f0
 already initialized
Date: Sat, 11 Aug 2007 14:21:48 -0400 (EDT)

 I can reproduce the panic, with 7.0-CURRENT-200706, in less then one minute
 by running that "dt" script a couple of times.  I have added the backtrace of
 the aio kernel module, after I RTFM.  This is with 7.0-CURRENT-200706.  This
 does not include Kostik Belousov's patch.
 
 
 amd# kldstat
 Id Refs Address    Size     Name
  1    4 0xc0400000 8930c8   kernel
  2    1 0xc0c94000 69c8c    acpi.ko
  3    1 0xc4809000 9000     aio.ko
 
 
 amd# objdump --section-headers /boot/kernel/aio.ko | grep text
   4 .text         000045ca  00002ef0  00002ef0  00002ef0  2**4
 
 
 amd# kgdb kernel.debug vmcore.18
 [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]
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 Type "show copying" to see the conditions.
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 This GDB was configured as "i386-marcel-freebsd".
 
 Unread portion of the kernel message buffer:
 panic: lock "aiomtx" 0xc481a174 already initialized
 cpuid = 0
 KDB: enter: panic
 Uptime: 14m27s
 Physical memory: 1139 MB
 Dumping 52 MB: 37 21 5
 
 #0  doadump () at pcpu.h:172
 172     pcpu.h: No such file or directory.
         in pcpu.h
 (kgdb) add-symbol-file /boot/kernel/aio.ko 0xC480BEF0
 add symbol table from file "/boot/kernel/aio.ko" at
         .text_addr = 0xc480bef0
 (y or n) y
 Reading symbols from /boot/kernel/aio.ko...Reading symbols from /boot/kernel/aio.ko.symbols...done.
 done.
 (kgdb) bt
 #0  doadump () at pcpu.h:172
 #1  0xc073ab4e in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
 #2  0xc073ae53 in panic (fmt=Variable "fmt" is not available.
 ) at /usr/src/sys/kern/kern_shutdown.c:563
 #3  0xc0761334 in lock_init (lock=0x0, class=0xc0acab44,
     name=0xc48106e7 "aiomtx", type=0x0, flags=131072)
     at /usr/src/sys/kern/subr_lock.c:201
 #4  0xc072f7f4 in mtx_init (m=0xc481a174, name=0xc48106e7 "aiomtx", type=0x0,
     opts=0) at /usr/src/sys/kern/kern_mutex.c:714
 #5  0xc480df2e in aio_init_aioinfo (p=0xc47a5970)
     at /usr/src/sys/modules/aio/../../kern/vfs_aio.c:507
 #6  0xc480e37c in aio_aqueue (td=0xc477fa00, job=0x28202800, lj=0x0, type=1,
     oldsigev=0) at /usr/src/sys/modules/aio/../../kern/vfs_aio.c:1341
 #7  0xc480f7f2 in aio_write (td=0xc477fa00, uap=0xec9cacfc)
     at /usr/src/sys/modules/aio/../../kern/vfs_aio.c:1942
 #8  0xc0988848 in syscall (frame=0xec9cad38)
     at /usr/src/sys/i386/i386/trap.c:1013
 #9  0xc096eb80 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:196
 #10 0x00000033 in ?? ()
 Previous frame inner to this frame (corrupt stack?)