Dear all

We ran into a nasty problem the other day. One of our mirrored zpool hosts several ZFS filesystems. After a reboot (all FS mounted at that time an in use) the machine paniced (console output further down). After detaching one of the mirrors the pool fortunately imported automatically in a faulted state without mounting the filesystems. Offling the unplugged device and clearing the fault allowed us to disable auto-mounting the filesystems. Going through them one by one all but one mounted OK. The one again triggered a panic. We left mounting on that one disabled for now to be back in production after pulling data from the backup tapes. Scrubbing didn't show any error so any idea what's behind the problem? Any chance to fix the FS?



panic[cpu3]/thread=ffffff0503498400: BAD TRAP: type=e (#pf Page fault) 
rp=ffffff001e937320 addr=20 occurred in module "zfs" due to a NULL pointer 

zfs: #pf Page fault
Bad kernel fault at addr=0x20
pid=27708, pc=0xfffffffff806b348, sp=0xffffff001e937418, eflags=0x10287
cr0: 8005003b<pg,wp,ne,et,ts,mp,pe> cr4: 6f8<xmme,fxsr,pge,mce,pae,pse,de>
cr2: 20cr3: 4194a7000cr8: c

        rdi: ffffff0503aaf9f0 rsi:                0 rdx:                0
        rcx:         155cda0b  r8:         eaa325f0  r9: ffffff001e937480
        rax:              7ff rbx:                0 rbp: ffffff001e937460
        r10:              7ff r11:                0 r12: ffffff0503aaf9f0
        r13: ffffff0503aaf9f0 r14: ffffff001e9375d0 r15: ffffff001e937610
        fsb:                0 gsb: ffffff04e7e5c040  ds:               4b
         es:               4b  fs:                0  gs:              1c3
        trp:                e err:                0 rip: fffffffff806b348
         cs:               30 rfl:            10287 rsp: ffffff001e937418
         ss:               38

ffffff001e937200 unix:die+dd ()
ffffff001e937310 unix:trap+177e ()
ffffff001e937320 unix:cmntrap+e6 ()
ffffff001e937460 zfs:zap_leaf_lookup_closest+40 ()
ffffff001e9374f0 zfs:fzap_cursor_retrieve+c9 ()
ffffff001e9375b0 zfs:zap_cursor_retrieve+19a ()
ffffff001e937780 zfs:zfs_purgedir+4c ()
ffffff001e9377d0 zfs:zfs_rmnode+52 ()
ffffff001e937810 zfs:zfs_zinactive+b5 ()
ffffff001e937860 zfs:zfs_inactive+ee ()
ffffff001e9378b0 genunix:fop_inactive+af ()
ffffff001e9378d0 genunix:vn_rele+5f ()
ffffff001e937ac0 zfs:zfs_unlinked_drain+af ()
ffffff001e937af0 zfs:zfsvfs_setup+fb ()
ffffff001e937b50 zfs:zfs_domount+16a ()
ffffff001e937c70 zfs:zfs_mount+1e4 ()
ffffff001e937ca0 genunix:fsop_mount+21 ()
ffffff001e937e00 genunix:domount+ae3 ()
ffffff001e937e80 genunix:mount+121 ()
ffffff001e937ec0 genunix:syscall_ap+8c ()
ffffff001e937f10 unix:brand_sys_sysenter+1eb ()

GPG fingerprint: B1 EE D2 39 2C 82 26 DA  A5 4D E0 50 35 75 9E ED
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