ZFS Panic

[Cy Schubert]

I got this panic after issuing reboot(8).

FreeBSD  7.1-STABLE FreeBSD 7.1-STABLE #0: Tue Feb 17 19:29:23 PST 2009     
cy at cwsys:/export/obj/export/home/cy/test/test-stable7/sys/DEBUG  i386


FreeBSD/i386 (bob) (ttyd0)

login: Feb 17 21:22:56 bob reboot: rebooted by root
Feb 17 21:22:56 bob syslogd: exiting on signal 15
Waiting (max 60 seconds) for system process `vnlru' to stop...done
Waiting (max 60 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining...2 2 2 2 1 1 1 1 0 0 0 0 0 0 done
Waiting (max 60 seconds) for system process `bufdaemon' to stop...done
All buffers synced.
panic: insmntque() failed: error 16
cpuid = 0
KDB: enter: panic
[thread pid 1086 tid 100090 ]
Stopped at      kdb_enter_why+0x3a:     movl    $0,kdb_why
db> bt
Tracing pid 1086 tid 100090 td 0xc2bfd230
kdb_enter_why(c087ef4a,c087ef4a,c2b1b5b4,ebf8da58,0,...) at 
kdb_enter_why+0x3a
panic(c2b1b5b4,10,c2b24a40,ebf8da64,c38e6000,...) at panic+0x136
gfs_file_create(84,c346d8a0,c342d5a0,c2b24a40,c346d8a0,...) at 
gfs_file_create+0x86
gfs_dir_create(84,c346d8a0,c342d5a0,c2b24a40,0,...) at gfs_dir_create+0x2c
zfsctl_mknode_snapdir(c346d8a0,c2b1b54f,275,25d,c3419520,...) at 
zfsctl_mknode_snapdir+0x53
gfs_dir_lookup(c346d8a0,c2b21126,ebf8db74,c091521c,ebf8db38,...) at 
gfs_dir_lookup+0xd1
zfsctl_root_lookup(c346d8a0,c2b21126,ebf8db74,0,0,...) at 
zfsctl_root_lookup+0xdc
zfsctl_umount_snapshots(c342d5a0,80000,c3acb800,c3216844,0,...) at 
zfsctl_umount_snapshots+0x4e
zfs_umount(c342d5a0,80000,c2bfd230,c2bfd230,c088a687,...) at zfs_umount+0x53
dounmount(c342d5a0,80000,c2bfd230,e26988ac,0,...) at dounmount+0x430
vfs_unmountall(c087ed87,0,c087edeb,128,0,...) at vfs_unmountall+0x4e
boot(c090b5d0,0,c087edeb,ab,ebf8dd2c,...) at boot+0x44f
reboot(c2bfd230,ebf8dcfc,4,c0885aef,c08c38a8,...) at reboot+0x4b
syscall(ebf8dd38) at syscall+0x2b3
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (55, FreeBSD ELF32, reboot), eip = 0x280bc947, esp = 
0xbfbfeb7c, ebp = 0xbfbfebb8 ---
db> 

Forceably unmounting ZFS filesystems prior to issuing reboot(8) mitigates 
the panic.


-- 
Cheers,
Cy Schubert <Cy.Schubert at komquats.com>
FreeBSD UNIX:  <cy at FreeBSD.org>   Web:  http://www.FreeBSD.org

			e**(i*pi)+1=0