unable to handle kernel NULL pointer dereference zfs_preumount

[leelists]

Hi,

After upgrading to ubuntu precise, i get the following kernel oopses :

Any clues ? (I'm using zfs-0.6.0-rc8 compiled against precise kernel)

Regards,
Lee

[ 1611.882272] Pid: 18376, comm: mount.zfs Tainted: P D O 3.2.0-23-generic #36-Ubuntu Dell Inc. Precision M6500 /0R1203
[ 1611.882279] RIP: 0010:[] [] zfs_preumount+0x10/0x30 [zfs]
[ 1611.882322] RSP: 0000:ffff88009cd33d38 EFLAGS: 00010296
[ 1611.882326] RAX: 0000000000000000 RBX: ffff88009f40a400 RCX: 0000000000000002
[ 1611.882329] RDX: 0000000180080007 RSI: 0000000000000007 RDI: 0000000000000000
[ 1611.882333] RBP: ffff88009cd33d38 R08: 0000000000000000 R09: 0000000000000000
[ 1611.882336] R10: ffff88009f408400 R11: 0000000000000002 R12: ffffffffa024a4c0
[ 1611.882340] R13: ffffffffa0220c40 R14: ffff88009cd33db8 R15: 0000000002000000
[ 1611.882344] FS: 00007f5a9c74ac00(0000) GS:ffff88021bc80000(0000) knlGS:0000000000000000
[ 1611.882349] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1611.882352] CR2: 0000000000000490 CR3: 000000009dc5e000 CR4: 00000000000006e0
[ 1611.882356] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1611.882359] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1611.882364] Process mount.zfs (pid: 18376, threadinfo ffff88009cd32000, task ffff880097355bc0)
[ 1611.882367] Stack:
[ 1611.882369] ffff88009cd33d58 ffffffffa0220bf6 ffff88021bfae330 ffff88009f40a400
[ 1611.882377] ffff88009cd33d78 ffffffff8117a34c fffffffffffffff0 00000000fffffff0
[ 1611.882384] ffff88009cd33da8 ffffffff8117a873 ffff88009b47c300 ffffffffa024a4c0
[ 1611.882391] Call Trace:
[ 1611.882433] [] zpl_kill_sb+0x16/0x30 [zfs]
[ 1611.882441] [] deactivate_locked_super+0x3c/0xa0
[ 1611.882447] [] mount_nodev+0xb3/0xc0
[ 1611.882492] [] zpl_mount+0x25/0x30 [zfs]
[ 1611.882497] [] mount_fs+0x43/0x1b0
[ 1611.882506] [] vfs_kern_mount+0x6a/0xc0
[ 1611.882514] [] do_kern_mount+0x54/0x110
[ 1611.882519] [] do_mount+0x1a4/0x260
[ 1611.882525] [] sys_mount+0x90/0xe0
[ 1611.882531] [] system_call_fastpath+0x16/0x1b
[ 1611.882534] Code: 05 00 00 48 c7 c6 6b cf 22 a0 48 c7 c7 28 d9 23 a0 e8 35 8f ed ff e9 b8 fe ff ff 55 48 89 e5 66 66 66 66 90 48 8b bf b0 02 00 00 <48> 83 bf 90 04 00 00 00 74 05 e8 01 cb fe ff 5d c3 66 66 66 66
[ 1611.882583] RIP [] zfs_preumount+0x10/0x30 [zfs]
[ 1611.882625] RSP
[ 1611.882628] CR2: 0000000000000490
[ 1611.882632] ---[ end trace 2fc2d8fcb8f232d3 ]---
[ 1611.885623] BUG: unable to handle kernel NULL pointer dereference at 0000000000000490
[ 1611.885629] IP: [] zfs_preumount+0x10/0x30 [zfs]
[ 1611.885675] PGD 989c5067 PUD 9648e067 PMD 0
[ 1611.885680] Oops: 0000 [#2899] SMP
[ 1611.885685] CPU 2
[ 1611.885686] Modules linked in: md4 nls_utf8 cifs pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables vboxdrv(O) kvm_intel kvm microcode deflate ctr twofish_generic twofish_x86_64_3way twofish_x86_64 twofish_common camellia serpent blowfish_generic blowfish_x86_64 blowfish_common cast5 des_generic xcbc rmd160 sha512_generic crypto_null af_key dm_crypt joydev bnep parport_pc rfcomm ppdev bluetooth nfsd nfs binfmt_misc lockd fscache auth_rpcgss nfs_acl sunrpc coretemp pcmcia snd_hda_codec_idt dell_wmi sparse_keymap arc4 dell_laptop dcdbas nvidia(P) bridge stp psmouse uvcvideo snd_hda_intel serio_raw snd_hda_codec videodev snd_hwdep v4l2_compat_ioctl32 snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event yenta_socket pcmcia_rsrc pcmcia_core snd_seq tifm_7xx1 tifm_core b43 snd_timer snd_seq_device i7core_edac edac_core mac80211 snd zfs(P) cfg80211 bcma zcommon(P) znvpair(P) wmi zavl(P) zunicode(P) mac_hid soundcore snd_page_alloc spl(O) zlib_deflate lp parport usbhid hid firewire_ohci sdhci_pci sdhci firewire_core crc_itu_t tg3 ssb video

[behlendorf]

This is a duplicate of #639 which was fixed post -rc8. Grab the latest master source if you need a fix now, or commit 1f0d8a5 .