kern/116913: panic: ffs_blkfree: freeing free block

[Rolf Witt]

The following reply was made to PR kern/116913; it has been noted by GNATS.

From: Rolf Witt <rowi at free.de>
To: bug-followup at FreeBSD.org,  rowi at free.de
Cc:  
Subject: Re: kern/116913: panic: ffs_blkfree: freeing free block
Date: Sat, 13 Oct 2007 20:29:20 +0200

 New Panic:
 
 Backtrace from crash tonight (after portsnap cron update):
 
 # 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 <softdep_flush>, 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 at peanuts.homenet.local:/usr/obj/usr/src/sys/PEANUTS  i386
 
 Sources from Builddate.
 
 I will try this patch:
 
 <http://www.googlebit.com/freebsd/patches/ffs_softdep.c-patch>
 
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