OOPS on Linux 3.2.0

[devsk]

The master as of 12-13 days ago builds fine on 3.2.0 but dies with the following Oops. Any ideas? xattrs are disabled on all the datasets. This is most likely mythbackend's data store which is on a ZFS dataset and its trying to initialize something on it.

[   24.405000] BUG: unable to handle kernel NULL pointer dereference at           (null)
[   24.405000] IP: [] zpl_xattr_security_init+0xd/0x6a [zfs]
[   24.405000] PGD 338526067 PUD 3385f0067 PMD 0 
[   24.405000] Oops: 0000 [#1] SMP 
[   24.405000] CPU 2 
[   24.405000] Modules linked in: snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss zfs(P) zcommon(P) znvpair(P) zavl(P) zunicode(P) spl(O) ohci_hcd tun snd_intel8x0 snd_ac97_codec ac97_bus acpi_cpufreq mperf cifs fuse crc32c_intel coretemp f71882fg tuner_simple tuner_types nvidia(P) tda9887 tda8290 wm8775 tuner cx25840 snd_hda_codec_realtek pvrusb2 uvcvideo dvb_core cx2341x tveeprom v4l2_common videodev snd_hda_intel v4l2_compat_ioctl32 snd_hda_codec snd_pcm snd_timer snd r8169 evdev agpgart i2c_i801 snd_page_alloc usb_storage uhci_hcd ehci_hcd mpt2sas
[   24.405000] 
[   24.405000] Pid: 5545, comm: mythbackend Tainted: P           O 3.2.0 #3 OEM OEM/132-BL-E758
[   24.405000] RIP: 0010:[]  [] zpl_xattr_security_init+0xd/0x6a [zfs]
[   24.405000] RSP: 0018:ffff880338501908  EFLAGS: 00010282
[   24.405000] RAX: 0000000000000000 RBX: ffff880338e0c000 RCX: 0000000000000014
[   24.405000] RDX: ffff8803507ed9a0 RSI: ffff880338ee9d08 RDI: ffff880338863828
[   24.405000] RBP: ffff880338863828 R08: 0000000000000000 R09: 0000000000000000
[   24.405000] R10: 0000000000000000 R11: ffff8803385018b0 R12: 00000000ffffffea
[   24.405000] R13: ffff88033de08430 R14: ffff880338836748 R15: ffff8803507ed980
[   24.405000] FS:  00007f1e3aa3e7a0(0000) GS:ffff88035fc40000(0000) knlGS:0000000000000000
[   24.405000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   24.405000] CR2: 0000000000000000 CR3: 0000000338e16000 CR4: 00000000000006e0
[   24.405000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   24.405000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   24.405000] Process mythbackend (pid: 5545, threadinfo ffff880338500000, task ffff88034ff1cbc0)
[   24.405000] Stack:
[   24.405000]  ffff880338e0c000 ffff880338863828 ffff880338863680 ffffffffa0eed438
[   24.405000]  ffff88033e250c00 ffff880300000011 0000000000000000 000000000000100d
[   24.405000]  ffff8803388637a0 0000000000000000 0000000000050008 ffff88033a7c1e48
[   24.406000] Call Trace:
[   24.406000]  [] ? zfs_inode_update+0x438/0x4c0 [zfs]
[   24.406000]  [] ? zfs_mknode+0xa5c/0xaf3 [zfs]
[   24.406000]  [] ? zfs_create+0x40d/0x655 [zfs]
[   24.406000]  [] ? crfree+0x107/0x13b [spl]
[   24.406000]  [] ? zpl_write_common+0x6ab/0x9eb [zfs]
[   24.406000]  [] ? generic_permission+0x4d/0xf5
[   24.406000]  [] ? vfs_create+0x4f/0x6f
[   24.406000]  [] ? do_last.isra.48+0x21b/0x41c
[   24.406000]  [] ? path_openat+0xcd/0x2f9
[   24.406000]  [] ? user_path_at_empty+0x5a/0x82
[   24.406000]  [] ? do_filp_open+0x2a/0x6e
[   24.406000]  [] ? alloc_fd+0x65/0x109
[   24.406000]  [] ? do_sys_open+0x5e/0xec
[   24.406000]  [] ? system_call_fastpath+0x16/0x1b
[   24.406000] Code: e0 eb 05 e8 8e 75 15 e0 48 89 ef e8 84 05 f1 ff 48 83 c4 48 49 63 c4 5b 5d 41 5c 41 5d c3 41 54 41 bc ea ff ff ff 55 48 89 fd 53 <80> 3c 25 00 00 00 00 00 74 37 31 d2 48 c7 c6 b7 60 f1 a0 48 c7 
[   24.406000] RIP  [] zpl_xattr_security_init+0xd/0x6a [zfs]
[   24.406000]  RSP 
[   24.406000] CR2: 0000000000000000
[   24.406000] ---[ end trace c1fdda368f3d0d1a ]---

[devsk]

Looks like the fix from 516 has fixed this one.