i386/123768: [panic] [vm] 7.0-STABLE locking issue on Soekris net4801 (sys/vm/vm_pageout.c)

[Alexander]

The following reply was made to PR i386/123768; it has been noted by GNATS.

From: Alexander <freebsd at nagilum.org>
To: bug-followup at freebsd.org
Cc:  
Subject: Re: i386/123768: [panic] [vm] 7.0-STABLE locking issue on Soekris
	net4801 (sys/vm/vm_pageout.c)
Date: Sun, 18 May 2008 22:22:56 +0200

 I just got another crash:
 root at cakebox /var/crash > kgdb -v /boot/kernel/kernel /var/crash/vmcore.2
 kgdb: core file: /var/crash/vmcore.2
 kgdb: kernel image: /boot/kernel/kernel
 [GDB will not be able to debug user-mode threads: =20
 /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".
 There is no member named pathname.
 Reading symbols from /boot/kernel/ng_ether.ko...Reading symbols from =20
 /boot/kernel/ng_ether.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/ng_ether.ko
 Reading symbols from /boot/kernel/netgraph.ko...Reading symbols from =20
 /boot/kernel/netgraph.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/netgraph.ko
 Reading symbols from /boot/kernel/geom_journal.ko...Reading symbols =20
 from /boot/kernel/geom_journal.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/geom_journal.ko
 
 Unread portion of the kernel message buffer:
 lockmgr: thread 0xc0fdf440 unlocking unheld lock
 panic: vn_finished_write: neg cnt
 Uptime: 1d2h19m52s
 Physical memory: 123 MB
 Dumping 59 MB: 44 28 12
 
 #0  doadump () at pcpu.h:195
 195     pcpu.h: No such file or directory.
          in pcpu.h
 (kgdb) bt
 #0  doadump () at pcpu.h:195
 #1  0xc0504669 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c:41=
 8
 #2  0xc0504820 in panic (fmt=3DVariable "fmt" is not available.
 ) at /usr/src/sys/kern/kern_shutdown.c:572
 #3  0xc0574115 in vn_finished_write (mp=3D0xc0feb538)
      at /usr/src/sys/kern/vfs_vnops.c:1049
 #4  0xc0637816 in vm_pageout () at /usr/src/sys/vm/vm_pageout.c:1028
 #5  0xc04e8d7b in fork_exit (callout=3D0xc0636a30 <vm_pageout>, arg=3D0x0,
      frame=3D0xc7b6ad38) at /usr/src/sys/kern/kern_fork.c:783
 #6  0xc0646ab0 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:2=
 05
 (kgdb) x 0xc7b6ad38
 0xc7b6ad38:     0x00000000
 
 Some time after I the machine was running again I also saw this (for =20
 the first time) on the console:
 fsync: giving up on dirty
 0xc1286550: tag devfs, type VCHR
      usecount 1, writecount 0, refcount 5 mountedhere 0xc115e300
      flags ()
      v_object 0xc12e0b24 ref 0 pages 7
       lock type devfs: EXCL (count 1) by thread 0xc11d8aa0 (pid 1071)
          dev ad0s1d.eli.journal
 GEOM_JOURNAL: Cannot suspend file system /export/home (error=3D35).
 fsync: giving up on dirty
 0xc1286550: tag devfs, type VCHR
      usecount 1, writecount 0, refcount 5 mountedhere 0xc115e300
      flags ()
      v_object 0xc12e0b24 ref 0 pages 7
       lock type devfs: EXCL (count 1) by thread 0xc11d8aa0 (pid 1071)
          dev ad0s1d.eli.journal
 GEOM_JOURNAL: Cannot suspend file system /export/home (error=3D35).
 
 I looked:
 root at cakebox ~ > ps -axp 1071
    PID  TT  STAT      TIME COMMAND
   1071  ??  DL     0:00.92 [g_journal switcher]
 
 
 
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