Backtrace from crash tonight (after portsnap cron):

# kgdb kernel.debug /var/crash/vmcore.1
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads:
/usr/lib/libthread_db.so: Unde fined 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 "i386-marcel-freebsd".

Unread portion of the kernel message buffer:
dev = ad4s1f, block = 26098960, fs = /usr
panic: ffs_blkfree: freeing free block
Uptime: 1d10h32m17s
Physical memory: 631 MB
Dumping 150 MB: 135 119 103 87 71 55 39 23 7

#0 doadump () at pcpu.h:195
195 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) backtrace
#0 doadump () at pcpu.h:195
#1 0xc06328a3 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2 0xc0632aa4 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc07d4d10 in ffs_blkfree (ump=0xc323ab00, fs=0xc321c800,
devvp=0xc328add0, bno=26098960, size=16384, inum=6500370)
at /usr/src/sys/ufs/ffs/ffs_alloc.c:1893
#4 0xc07e8588 in indir_trunc (freeblks=0xc3e12500, dbn=103954304, level=0,
lbn=12, countp=0xd9177c4c) at /usr/src/sys/ufs/ffs/ffs_softdep.c:2896
#5 0xc07e8850 in handle_workitem_freeblocks (freeblks=0xc3e12500, flags=0)
at /usr/src/sys/ufs/ffs/ffs_softdep.c:2746
#6 0xc07ea0d8 in process_worklist_item (mp=0xc324b7d4, flags=Variable
"flags" is not available.
)
at /usr/src/sys/ufs/ffs/ffs_softdep.c:963
#7 0xc07eb191 in softdep_process_worklist (mp=0xc324b7d4, full=0)
at /usr/src/sys/ufs/ffs/ffs_softdep.c:847
#8 0xc07ed70a in softdep_flush () at /usr/src/sys/ufs/ffs/ffs_softdep.c:758
#9 0xc06121d1 in fork_exit (callout=0xc07ed290 , arg=0x0,
frame=0xd9177d38) at /usr/src/sys/kern/kern_fork.c:796
#10 0xc0850170 in fork_trampoline () at
/usr/src/sys/i386/i386/exception.s:205
(kgdb)

# uname -a
FreeBSD peanuts.homenet.local 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE
#121: Thu Oct 11 16:29:05 CEST 2007
rowi@peanuts.homenet.local:/usr/obj/usr/src/sys/PEANUTS i386

Sources from Builddate.

Rowi

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