ZFS panic: existing znode
kmacy at freebsd.org
Tue May 12 21:47:39 UTC 2009
This is fairly easy to reproduce with stress2 + fsstress. I haven't
had time to track down the locking bug yet.
On Tue, May 12, 2009 at 12:39 PM, Matthew West <mwest at l.zeeb.org> wrote:
> FreeBSD 8-CURRENT, built from sources around 27/02/2009:
> FreeBSD foo.internal 8.0-CURRENT FreeBSD 8.0-CURRENT #5: Fri Apr 17 18:33:02 BST 2009 mwest at foo.internal:/usr/obj/usr/src/sys/DEBUGLOCK amd64
> The system is AMD64, with 16GB of RAM, serving a few hundred clients via
> NFS (v2 and v3) and Samba, from a 800GB ZFS pool; using hardware RAID
> (aac controller), not RAID-Z.
> Running a GENERIC kernel, but with the following options enabled:
> options DEBUG_LOCKS
> options DEBUG_VFS_LOCKS
> options DIAGNOSTIC
> I also have Jaakko Heinonen's patch to zfs_znode.c applied, from:
> After almost a week of active usage, there was a system panic.
> panic: existing znode 0xffffff007dfd3d38 for dbuf 0xffffff00aeeb9620
> cpuid = 2
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> panic() at panic+0x182
> zfs_znode_dmu_init() at zfs_znode_dmu_init+0xb5
> zfs_znode_alloc() at zfs_znode_alloc+0xa0
> zfs_mknode() at zfs_mknode+0x205
> zfs_freebsd_create() at zfs_freebsd_create+0x617
> VOP_CREATE_APV() at VOP_CREATE_APV+0xb3
> nfsrv_create() at nfsrv_create+0x909
> nfssvc() at nfssvc+0x4af
> syscall() at syscall+0x1e7
> Xfast_syscall() at Xfast_syscall+0xab
> --- syscall (155, FreeBSD ELF64, nfssvc), rip = 0x800695c4c, rsp = 0x7fffffffe8e8, rbp = 0 ---
> I see Kris Kennaway encountered a similar crash, but no one seems to
> have replied:
> I was unfortunately not able to generate a crash dump.
> Let me know if there's any further information I can provide which
> might be useful.
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