Hi. I'm seeing a NULL pointer deference in inode_has_perm with Linux kernel 3.4.27. Does anyone have any ideas what this issue might be? As another point of reference, I've also seen this on 2.6.39.4. [63314.399998] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 [63314.400270] IP: [<ffffffff8121f3f6>] inode_has_perm+0x1b/0x36 [63314.400471] PGD 610cad067 PUD 610cae067 PMD 0 [63314.400635] Oops: 0000 [#1] SMP [63314.400756] CPU 7 [63314.400821] Modules linked in: ipv6 dm_multipath video sbs sbshc hed acpi_pad acpi_memhotplug acpi_ipmi parport_pc lp parport tcp_diag inet_diag ipmi_si ipmi_devintf ipmi_msghandler dell_rbu snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss joydev snd_pcm ioatdma snd_timer snd soundcore snd_page_alloc igb pcspkr dca dcdbas i2c_i801 shpchp i2c_core iTCO_wdt i7core_edac iTCO_vendor_support edac_core microcode [63314.402381] [63314.402435] Pid: 15274, comm: python2.6 Not tainted 3.4.27 #1 Dell C6100 /0D61XP [63314.402740] RIP: 0010:[<ffffffff8121f3f6>] [<ffffffff8121f3f6>] inode_has_perm+0x1b/0x36 [63314.403012] RSP: 0018:ffff88032cba1ba8 EFLAGS: 00010246 [63314.403187] RAX: 0000000000000000 RBX: ffff8805d621ca20 RCX: ffff88032cba1bb8 [63314.403418] RDX: 0000000000800000 RSI: ffff8805d621ca20 RDI: ffff8805ee9c1500 [63314.403649] RBP: ffff88032cba1ba8 R08: 0000000000000080 R09: 0000000000000080 [63314.403880] R10: 0000000000800000 R11: ffff88032cba1b48 R12: ffff8805ee9c1500 [63314.404111] R13: 0000000000000081 R14: 0000000000000000 R15: ffff880183945b40 [63314.404343] FS: 0000000049bb5940(0063) GS:ffff88063fc60000(0000) knlGS:0000000000000000 [63314.404604] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [63314.404791] CR2: 0000000000000020 CR3: 0000000610cac000 CR4: 00000000000007e0 [63314.405022] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [63314.405253] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [63314.405484] Process python2.6 (pid: 15274, threadinfo ffff88032cba0000, task ffff880183945b40) [63314.405762] Stack: [63314.405831] ffff88032cba1c18 ffffffff81220631 0000000000000009 0000000000000000 [63314.406096] ffff8805d621ca20 0000000000000000 ffff88032cba1be8 0000000000000010 [63314.406359] 0000000000000000 0000000000000000 ffff88032cba1c48 ffff8805d621ca20 [63314.406623] Call Trace: [63314.406710] [<ffffffff81220631>] selinux_inode_permission+0x85/0x90 [63314.406920] [<ffffffff8121ccf0>] security_inode_permission+0x1e/0x20 [63314.407133] [<ffffffff81146d82>] inode_permission+0xd3/0xdf [63314.407318] [<ffffffff81146dfa>] link_path_walk+0x6c/0x4b4 [63314.407503] [<ffffffff8114ecce>] ? dput+0x2f/0xe2 [63314.407661] [<ffffffff811473cf>] ? path_init+0xd4/0x2ea [63314.407836] [<ffffffff8114763e>] path_lookupat+0x59/0x330 [63314.408019] [<ffffffff8112cb73>] ? kmem_cache_alloc+0x31/0x103 [63314.408212] [<ffffffff8114793d>] do_path_lookup+0x28/0xa4 [63314.408393] [<ffffffff81149a3a>] user_path_at_empty+0x55/0x94 [63314.408586] [<ffffffff81073878>] ? wake_up_state+0x10/0x12 [63314.408772] [<ffffffff8108f727>] ? wake_futex+0x64/0x69 [63314.408947] [<ffffffff8108f81c>] ? futex_wake+0xf0/0x102 [63314.409124] [<ffffffff81149a8a>] user_path_at+0x11/0x13 [63314.409301] [<ffffffff81140ab3>] vfs_fstatat+0x42/0x6d [63314.409473] [<ffffffff81140bd0>] vfs_stat+0x1b/0x1d [63314.409636] [<ffffffff81140bf1>] sys_newstat+0x1f/0x3d [63314.409812] [<ffffffff814e2f69>] system_call_fastpath+0x16/0x1b [63314.410007] Code: fe 48 c7 40 68 07 00 00 00 e8 6c d8 f0 ff c9 c3 55 48 89 e5 66 66 66 66 90 31 c0 41 89 d2 f6 46 0d 02 75 20 48 8b 46 38 45 89 c1 <0f> b7 50 20 8b 70 1c 49 89 c8 48 8b 47 68 44 89 d1 8b 78 04 e8 [63314.410998] RIP [<ffffffff8121f3f6>] inode_has_perm+0x1b/0x36 [63314.411195] RSP <ffff88032cba1ba8> [63314.411310] CR2: 0000000000000020 [63314.411846] ---[ end trace fa4043a7d7cc37e7 ]--- Cheers, Vinson -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html