running ubuntu-bug linux, after collect data , gdm crash and switch to unusable console (no cursor, only mouse pointer) that show the below 'cut here', i was able to restore this session only hitting many times ctrl+alt+f7. As apport still running i can send this. Feb 5 18:55:09 ubuntu kernel: [ 484.329356] ------------[ cut here ]------------ Feb 5 18:55:09 ubuntu kernel: [ 484.329382] kernel BUG at /build/buildd/linux-2.6.38/fs/namei.c:406! Feb 5 18:55:09 ubuntu kernel: [ 484.329395] invalid opcode: 0000 [#1] SMP Feb 5 18:55:09 ubuntu kernel: [ 484.329405] last sysfs file: /sys/devices/pci0000:00/0000:00:05.0/drm/card0/card0-VGA-1/status Feb 5 18:55:09 ubuntu kernel: [ 484.329419] CPU 0 Feb 5 18:55:09 ubuntu kernel: [ 484.329423] Modules linked in: dm_crypt lp snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm ppdev binfmt_misc snd_seq_midi snd_rawmidi arc4 snd_seq_midi_event rtl8180 snd_seq mac80211 psmouse snd_timer snd_seq_device serio_raw eeprom_93cx6 cfg80211 parport_pc edac_core ns558 snd gameport k8temp edac_mce_amd parport soundcore nv_tco snd_page_alloc i2c_nforce2 squashfs aufs nls_iso8859_1 nls_cp437 vfat fat dm_raid45 xor btrfs lzo_compress zlib_deflate libcrc32c nouveau ttm drm_kms_helper usb_storage uas drm sata_nv pata_amd forcedeth floppy i2c_algo_bit video Feb 5 18:55:09 ubuntu kernel: [ 484.329578] Feb 5 18:55:09 ubuntu kernel: [ 484.329592] Pid: 3957, comm: fuser Not tainted 2.6.38-1-generic #28-Ubuntu K8NF4G-SATA2/K8NF4G-SATA2 Feb 5 18:55:09 ubuntu kernel: [ 484.329610] RIP: 0010:[<ffffffff81169bf7>] [<ffffffff81169bf7>] nameidata_drop_rcu+0x127/0x130 Feb 5 18:55:09 ubuntu kernel: [ 484.329645] RSP: 0018:ffff880039387c68 EFLAGS: 00010246 Feb 5 18:55:09 ubuntu kernel: [ 484.329655] RAX: ffff8800150ec440 RBX: ffff880039387dc8 RCX: ffff880037578b00 Feb 5 18:55:09 ubuntu kernel: [ 484.329669] RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffff880039387dc8 Feb 5 18:55:09 ubuntu kernel: [ 484.329681] RBP: ffff880039387ca8 R08: 0000000000000000 R09: 0000000000000000 Feb 5 18:55:09 ubuntu kernel: [ 484.329693] R10: 0000000000000001 R11: 0000000000000246 R12: ffff8800375593c0 Feb 5 18:55:09 ubuntu kernel: [ 484.329704] R13: ffff880037a55c40 R14: ffff880039387d28 R15: ffff8800150ec440 Feb 5 18:55:09 ubuntu kernel: [ 484.329720] FS: 00007f8a8eac6720(0000) GS:ffff88003b000000(0000) knlGS:0000000000000000 Feb 5 18:55:09 ubuntu kernel: [ 484.329733] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Feb 5 18:55:09 ubuntu kernel: [ 484.329744] CR2: 00000000025d91a8 CR3: 000000000307c000 CR4: 00000000000006f0 Feb 5 18:55:09 ubuntu kernel: [ 484.329757] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Feb 5 18:55:09 ubuntu kernel: [ 484.329769] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Feb 5 18:55:09 ubuntu kernel: [ 484.329781] Process fuser (pid: 3957, threadinfo ffff880039386000, task ffff8800150ec440) Feb 5 18:55:09 ubuntu kernel: [ 484.329794] Stack: Feb 5 18:55:09 ubuntu kernel: [ 484.329799] ffff880039387d28 ffff8800150ec440 ffff880039387ca8 ffff8800375593c0 Feb 5 18:55:09 ubuntu kernel: [ 484.329815] ffff880039387dc8 0000000000000000 ffff880039387d28 ffff8800150ec440 Feb 5 18:55:09 ubuntu kernel: [ 484.329830] ffff880039387cc8 ffffffff8116a1b5 ffff880039387dc8 0000000000000000 Feb 5 18:55:09 ubuntu kernel: [ 484.329845] Call Trace: Feb 5 18:55:09 ubuntu kernel: [ 484.329859] [<ffffffff8116a1b5>] force_reval_path.clone.16+0x55/0x70 Feb 5 18:55:09 ubuntu kernel: [ 484.329874] [<ffffffff8116b662>] link_path_walk+0xac2/0xba0 Feb 5 18:55:09 ubuntu kernel: [ 484.329894] [<ffffffff81272911>] ? security_inode_alloc+0x21/0x30 Feb 5 18:55:09 ubuntu kernel: [ 484.329912] [<ffffffff81176768>] ? inode_init_always+0x118/0x1d0 Feb 5 18:55:09 ubuntu kernel: [ 484.329926] [<ffffffff8116ba3b>] do_path_lookup+0x5b/0x160 Feb 5 18:55:09 ubuntu kernel: [ 484.329938] [<ffffffff8116bf67>] user_path_at+0x57/0xa0 Feb 5 18:55:09 ubuntu kernel: [ 484.329998] [<ffffffffa025fc49>] ? au_refresh_iattr+0xd9/0xf0 [aufs] Feb 5 18:55:09 ubuntu kernel: [ 484.330015] [<ffffffff81162288>] ? cp_new_stat+0xf8/0x110 Feb 5 18:55:09 ubuntu kernel: [ 484.330022] [<ffffffff81162549>] vfs_fstatat+0x39/0x70 Feb 5 18:55:09 ubuntu kernel: [ 484.330022] [<ffffffff811625bb>] vfs_stat+0x1b/0x20 Feb 5 18:55:09 ubuntu kernel: [ 484.330022] [<ffffffff811627fa>] sys_newstat+0x1a/0x40 Feb 5 18:55:09 ubuntu kernel: [ 484.330022] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b Feb 5 18:55:09 ubuntu kernel: [ 484.330022] Code: c3 4c 89 f7 e8 6b ef ec ff 66 90 48 8b 43 20 0f 1f 44 00 00 48 85 c0 bb f6 ff ff ff 74 cb 49 8d 7d 04 e8 4d ef ec ff 66 90 eb be <0f> 0b 0f 0b 0f 0b 0f 1f 00 55 48 89 e5 48 83 ec 50 48 89 5d d8 Feb 5 18:55:09 ubuntu kernel: [ 484.330022] RIP [<ffffffff81169bf7>] nameidata_drop_rcu+0x127/0x130 Feb 5 18:55:09 ubuntu kernel: [ 484.330022] RSP <ffff880039387c68> Feb 5 18:55:09 ubuntu kernel: [ 484.345384] ---[ end trace ec6078a9d8064c5f ]--- Feb 5 18:55:09 ubuntu kernel: [ 484.801391] ACPI Warning: Incorrect checksum in table [OEMB] - 0x0A, should be 0xFC (20110112/tbutils-314) Feb 5 18:55:09 ubuntu kernel: [ 484.801783] ACPI Warning: Incorrect checksum in table [OEMB] - 0x0A, should be 0xFC (20110112/tbutils-314) Feb 5 18:56:57 ubuntu acpid: client connected from 1578[0:0] Feb 5 18:56:57 ubuntu acpid: 1 client rule loaded
We have been fixing a few bug in this area - can you please retest -rc5 when it is released and update this report? Also, please use bugzilla attachments for the oops reports - that wordwrapping makes things really hard to read. Thanks.
I was able to reproduce this with today Linus tree. If there isn't a fix yet, I proposed a change on LKML: https://lkml.org/lkml/2011/2/15/292
(In reply to comment #2) > I was able to reproduce this with today Linus tree. If there isn't a fix yet, > I > proposed a change on LKML: https://lkml.org/lkml/2011/2/15/292 Ok ignore this, was already fixed later today with commit 844a391 ("nothing in do_follow_link() is going to see RCU")