FreeBSD-9.1: machine reboots during snapshot creation, LORs found

[Konstantin Belousov]

On Sun, Jul 07, 2013 at 09:25:53AM +0200, Andre Albsmeier wrote:
> OK, here we go (looks better now):
> 
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> This GDB was configured as "i386-marcel-freebsd"...
> 
> Unread portion of the kernel message buffer:
> dev = stripe/p, block = 592, fs = /palveli
> panic: ffs_blkfree_cg: freeing free block
> KDB: stack backtrace:
> db_trace_self_wrapper(c08207eb,d70fc924,c05fdfc9,c081df13,c08a82e0,...) at db_trace_self_wrapper+0x26/frame 0xd70fc8f4
> kdb_backtrace(c081df13,c08a82e0,c0833a0b,d70fc930,d70fc930,...) at kdb_backtrace+0x29/frame 0xd70fc900
> panic(c0833a0b,c2aae178,250,0,c2af80d4,...) at panic+0xc9/frame 0xd70fc924
> ffs_blkfree_cg(250,0,8000,49f,d70fcad0,...) at ffs_blkfree_cg+0x399/frame 0xd70fc9c8
> ffs_blkfree(c2b35100,c2af8000,c2b0d470,250,0,...) at ffs_blkfree+0xad/frame 0xd70fca00
> indir_trunc(fffa3ff4,ffffffff,0,8000,0,...) at indir_trunc+0x658/frame 0xd70fcae0
> indir_trunc(ffffdff3,ffffffff,c072df0a,c2d68d00,c087abd8,...) at indir_trunc+0x514/frame 0xd70fcbc0
> handle_workitem_freeblocks(0,d70fcc4c,2,246,c2ab1000,...) at handle_workitem_freeblocks+0x2dc/frame 0xd70fcc24
> process_worklist_item(0,0,0,c086ae78,0,...) at process_worklist_item+0x27a/frame 0xd70fcc6c
> softdep_process_worklist(c2b36548,0,54,c0835825,64,...) at softdep_process_worklist+0x91/frame 0xd70fcc9c
> softdep_flush(0,d70fcd08,0,c2aac2f0,0,...) at softdep_flush+0x3e4/frame 0xd70fcccc
> fork_exit(c0738bb0,0,d70fcd08) at fork_exit+0xa2/frame 0xd70fccf4
> fork_trampoline() at fork_trampoline+0x8/frame 0xd70fccf4
> --- trap 0, eip = 0, esp = 0xd70fcd40, ebp = 0 ---
> Uptime: 2d16h29m37s
> Physical memory: 503 MB
> Dumping 95 MB: 80 64 48 32 16
> 
> No symbol "stopped_cpus" in current context.
> No symbol "stoppcbs" in current context.
> #0  doadump (textdump=1) at pcpu.h:249
> 249     pcpu.h: No such file or directory.
>         in pcpu.h
> (kgdb) where
> #0  doadump (textdump=1) at pcpu.h:249
> #1  0xc05fdddd in kern_reboot (howto=260) at /src/src-9/sys/kern/kern_shutdown.c:449
> #2  0xc05fe028 in panic (fmt=<value optimized out>) at /src/src-9/sys/kern/kern_shutdown.c:637
> #3  0xc0717899 in ffs_blkfree_cg (ump=0xc2b35100, fs=0xc2af8000, devvp=0xc2b0d470, bno=592, 
>     size=32768, inum=1183, dephd=0xd70fcad0) at /src/src-9/sys/ufs/ffs/ffs_alloc.c:2151
> #4  0xc0717c8d in ffs_blkfree (ump=0xc2b35100, fs=0xc2af8000, devvp=0xc2b0d470, bno=592, 
>     size=32768, inum=1183, vtype=VREG, dephd=0xd70fcad0) at /src/src-9/sys/ufs/ffs/ffs_alloc.c:2280
> #5  0xc0730348 in indir_trunc (freework=0xc2f99100, dbn=1642816, lbn=-376844)
>     at /src/src-9/sys/ufs/ffs/ffs_softdep.c:7965
> #6  0xc0730204 in indir_trunc (freework=0xc2f99100, dbn=1639680, lbn=-8205)
>     at /src/src-9/sys/ufs/ffs/ffs_softdep.c:7946
> #7  0xc07324bc in handle_workitem_freeblocks (freeblks=0xc2fc1e00, flags=512)
>     at /src/src-9/sys/ufs/ffs/ffs_softdep.c:7588
> #8  0xc0730dfa in process_worklist_item (mp=0xc2b36548, target=10, flags=512)
>     at /src/src-9/sys/ufs/ffs/ffs_softdep.c:1774
> #9  0xc07360c1 in softdep_process_worklist (mp=0xc2b36548, full=0)
>     at /src/src-9/sys/ufs/ffs/ffs_softdep.c:1558
> #10 0xc0738f94 in softdep_flush () at /src/src-9/sys/ufs/ffs/ffs_softdep.c:1414
> #11 0xc05d1b82 in fork_exit (callout=0xc0738bb0 <softdep_flush>, arg=0x0, frame=0xd70fcd08)
>     at /src/src-9/sys/kern/kern_fork.c:988
> #12 0xc07ba904 in fork_trampoline () at /src/src-9/sys/i386/i386/exception.s:279
> (kgdb) up 10
> #10 0xc0738f94 in softdep_flush () at /src/src-9/sys/ufs/ffs/ffs_softdep.c:1414
> 1414                            progress += softdep_process_worklist(mp, 0);
> 
> 	-Andre

This looks unrelated, and exactly this panic is usually has one of two
causes:
- corrupted filesystem, run fsck to recheck it;
- faulty hardware, most likely RAM, but might be CPU/CPU cache/bus.

Is it the same machine where the bcopy panic occured ?
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