NULL pointer dereference when browsing to .zfs directory with Nautilus

[wrouesnel]

Getting a NULL pointer dereference when I use Nautilus on Linux 3.2.0-30-generic x86_64 to browse to the .zfs directory (it works fine if I directly browse to .zfs/snapshots).

I'm running a zfs-daily build off the PPA: 0.6.0.80-0ubuntu1~precise1

Sep 20 12:55:38 will-laptop kernel: [ 3899.857282] BUG: unable to handle kernel NULL pointer dereference at 000000000000005f Sep 20 12:55:38 will-laptop kernel: [ 3899.857364] IP: [<ffffffff81182b95>] follow_managed+0x35/0x140 Sep 20 12:55:38 will-laptop kernel: [ 3899.857423] PGD 212fdb067 PUD 212fda067 PMD 0 Sep 20 12:55:38 will-laptop kernel: [ 3899.857475] Oops: 0000 [#2] SMP Sep 20 12:55:38 will-laptop kernel: [ 3899.857515] CPU 1 Sep 20 12:55:38 will-laptop kernel: [ 3899.857535] Modules linked in: snd_seq_dummy ip6table_filter ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter bbswitch(O) ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables kvm_intel bridge kvm stp bnep parport_pc ppdev rfcomm binfmt_misc ext2 snd_hda_codec_hdmi snd_hda_codec_realtek arc4 joydev snd_hda_intel uvcvideo snd_hda_codec iwlwifi videodev btusb i915 bluetooth snd_hwdep snd_pcm mac80211 v4l2_compat_ioctl32 r8168(O) snd_seq_midi snd_rawmidi drm_kms_helper snd_seq_midi_event drm snd_seq snd_timer snd_seq_device dell_wmi cfg80211 sparse_keymap snd dell_laptop intel_ips wmi i2c_algo_bit psmouse soundcore snd_page_alloc video coretemp mei(C) serio_raw lp mac_hid parport dcdbas zfs(P) zcommon(P) znvpair(P) zavl(P) zunicode(P) spl(O) zlib_deflate Sep 20 12:55:38 will-laptop kernel: [ 3899.858427] Sep 20 12:55:38 will-laptop kernel: [ 3899.858445] Pid: 2749, comm: nautilus Tainted: P D C O 3.2.0-30-generic #48-Ubuntu Dell Inc. XPS L501X /00CKNG Sep 20 12:55:38 will-laptop kernel: [ 3899.858537] RIP: 0010:[<ffffffff81182b95>] [<ffffffff81182b95>] follow_managed+0x35/0x140 Sep 20 12:55:38 will-laptop kernel: [ 3899.858607] RSP: 0018:ffff880212f21c08 EFLAGS: 00010246 Sep 20 12:55:38 will-laptop kernel: [ 3899.858651] RAX: 000000000000005f RBX: ffff880212f21d18 RCX: ffff88024a0abb00 Sep 20 12:55:38 will-laptop kernel: [ 3899.858707] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000005f Sep 20 12:55:38 will-laptop kernel: [ 3899.858762] RBP: ffff880212f21c58 R08: ffffffff8118d3cb R09: 0000000000000000 Sep 20 12:55:38 will-laptop kernel: [ 3899.858817] R10: 0000000000000000 R11: 0000000000000003 R12: ffff88024a0abb00 Sep 20 12:55:38 will-laptop kernel: [ 3899.858873] R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000 Sep 20 12:55:38 will-laptop kernel: [ 3899.858930] FS: 00007f14bebbd980(0000) GS:ffff88025bc80000(0000) knlGS:0000000000000000 Sep 20 12:55:38 will-laptop kernel: [ 3899.858994] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Sep 20 12:55:38 will-laptop kernel: [ 3899.859040] CR2: 000000000000005f CR3: 0000000212f47000 CR4: 00000000000006e0 Sep 20 12:55:38 will-laptop kernel: [ 3899.859096] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Sep 20 12:55:38 will-laptop kernel: [ 3899.863373] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Sep 20 12:55:38 will-laptop kernel: [ 3899.867655] Process nautilus (pid: 2749, threadinfo ffff880212f20000, task ffff880212db5c00) Sep 20 12:55:38 will-laptop kernel: [ 3899.871934] Stack: Sep 20 12:55:38 will-laptop kernel: [ 3899.876218] 0000000000000001 ffff880212f21d40 ffff880212f21c58 00ffffff81182b40 Sep 20 12:55:38 will-laptop kernel: [ 3899.880548] ffff880212f21c58 ffff880212f21dc8 ffff880212f21d18 000000000000005f Sep 20 12:55:38 will-laptop kernel: [ 3899.884769] 0000000000000001 ffff880212f21d40 ffff880212f21cd8 ffffffff81184bed Sep 20 12:55:38 will-laptop kernel: [ 3899.888901] Call Trace: Sep 20 12:55:38 will-laptop kernel: [ 3899.892873] [<ffffffff81184bed>] do_lookup+0x14d/0x310 Sep 20 12:55:38 will-laptop kernel: [ 3899.896738] [<ffffffff811869dc>] path_lookupat+0x11c/0x750 Sep 20 12:55:38 will-laptop kernel: [ 3899.900540] [<ffffffff8113b672>] ? do_wp_page+0x382/0x740 Sep 20 12:55:38 will-laptop kernel: [ 3899.904308] [<ffffffff81187041>] do_path_lookup+0x31/0xc0 Sep 20 12:55:38 will-laptop kernel: [ 3899.908025] [<ffffffff81187b49>] user_path_at_empty+0x59/0xa0 Sep 20 12:55:38 will-laptop kernel: [ 3899.911727] [<ffffffff8165dfe0>] ? do_page_fault+0x210/0x520 Sep 20 12:55:38 will-laptop kernel: [ 3899.915402] [<ffffffff81187ba1>] user_path_at+0x11/0x20 Sep 20 12:55:38 will-laptop kernel: [ 3899.919079] [<ffffffff8117cbda>] vfs_fstatat+0x3a/0x70 Sep 20 12:55:38 will-laptop kernel: [ 3899.922739] [<ffffffff8117cc4b>] vfs_stat+0x1b/0x20 Sep 20 12:55:38 will-laptop kernel: [ 3899.926370] [<ffffffff8117cd8a>] sys_newstat+0x1a/0x40 Sep 20 12:55:38 will-laptop kernel: [ 3899.930004] [<ffffffff81178090>] ? vfs_read+0xb0/0x180 Sep 20 12:55:38 will-laptop kernel: [ 3899.933605] [<ffffffff8165ab75>] ? page_fault+0x25/0x30 Sep 20 12:55:38 will-laptop kernel: [ 3899.937184] [<ffffffff81662a02>] system_call_fastpath+0x16/0x1b Sep 20 12:55:38 will-laptop kernel: [ 3899.940751] Code: 5d d8 4c 89 65 e0 4c 89 6d e8 4c 89 75 f0 4c 89 7d f8 66 66 66 66 90 4c 8b 27 45 31 ff 48 89 fb 41 89 f5 c6 45 cf 00 48 8b 7b 08 <8b> 07 41 89 c6 41 81 e6 00 00 07 00 75 47 80 7d cf 00 74 05 4c Sep 20 12:55:38 will-laptop kernel: [ 3899.944880] RIP [<ffffffff81182b95>] follow_managed+0x35/0x140 Sep 20 12:55:38 will-laptop kernel: [ 3899.948812] RSP <ffff880212f21c08> Sep 20 12:55:38 will-laptop kernel: [ 3899.952693] CR2: 000000000000005f Sep 20 12:55:38 will-laptop kernel: [ 3899.956646] ---[ end trace bd65a6977c9933e6 ]---

At a guess this is related to the problems people have been having with Samba crashing when they try to browse to .zfs.

[behlendorf]

Yup, this one has made it on to the short list of things to be fixed in the next tag.