[Bug 581525] [NEW] Lucid: system becomes unstable randomly, seems related with apparmor

Mon May 17 00:22:21 UTC 2010

Public bug reported:

Hi,

Since last week I am experiencing a problem which seems related to
apparmor. Kernel is crashing at aa_dfa_match_len+0xd9/0xf0, and a trace
like the the following appears on my system logs:

May 17 01:57:04 mplaptop kernel: [ 6430.314093] PGD 1002063 PUD 0 
May 17 01:57:04 mplaptop kernel: [ 6430.314101] CPU 1 
May 17 01:57:04 mplaptop kernel: [ 6430.314103] Modules linked in: xts gf128mul binfmt_misc ppdev vboxnetadp vboxnetflt vboxdrv sha256_generic cryptd aes_x86_64 aes_generic dm_crypt joydev snd_hda_codec_realtek ipt_REJECT ipt_LOG xt_limit xt_tcpudp ipt_addrtype xt_state dell_wmi arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm ip6table_filter ip6_tables snd_seq_dummy nf_nat_irc snd_seq_oss nf_conntrack_irc snd_seq_midi nf_nat_ftp snd_rawmidi nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 snd_seq_midi_event nf_conntrack_ftp snd_seq nf_conntrack iwlagn iptable_filter snd_timer snd_seq_device iwlcore ip_tables snd uvcvideo videodev v4l1_compat v4l2_compat_ioctl32 x_tables mac80211 sdhci_pci dell_laptop dcdbas sdhci led_class nvidia(P) soundcore snd_page_alloc cfg80211 psmouse serio_raw uinput lp parport usbhid hid fbcon tileblit font bitblit ohci1394 softcursor ieee1394 r8169 mii ahci vga16fb vgastate intel_agp video output
May 17 01:57:04 mplaptop kernel: [ 6430.314159] Pid: 5065, comm: gnome-panel Tainted: P      D    2.6.32-22-generic #33-Ubuntu Vostro1710
May 17 01:57:04 mplaptop kernel: [ 6430.314161] RIP: 0010:[<ffffffff8127dc49>]  [<ffffffff8127dc49>] aa_dfa_match_len+0xd9/0xf0
May 17 01:57:04 mplaptop kernel: [ 6430.314170] RSP: 0018:ffff880116649d20  EFLAGS: 00010216
May 17 01:57:04 mplaptop kernel: [ 6430.314172] RAX: 0000000000000039 RBX: ffff880051285a8c RCX: 0000000000000039
May 17 01:57:04 mplaptop kernel: [ 6430.314174] RDX: ffff88011e65a4f1 RSI: 0000000053726599 RDI: ffff88011e65a4f1
May 17 01:57:04 mplaptop kernel: [ 6430.314176] RBP: ffff880116649d38 R08: 0000000000000000 R09: ffff88012bbfc40c
May 17 01:57:04 mplaptop kernel: [ 6430.314177] R10: ffff88009697606c R11: ffff88011e65a4ff R12: ffff88012bbfc20c
May 17 01:57:04 mplaptop kernel: [ 6430.314179] R13: ffff88011e65a4de R14: ffff88011e65a4de R15: 0000000000000000
May 17 01:57:04 mplaptop kernel: [ 6430.314181] FS:  00007f689ffe17e0(0000) GS:ffff880028300000(0000) knlGS:0000000000000000
May 17 01:57:04 mplaptop kernel: [ 6430.314183] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
May 17 01:57:04 mplaptop kernel: [ 6430.314185] CR2: ffff8801d2a48f3e CR3: 0000000111c91000 CR4: 00000000000026e0
May 17 01:57:04 mplaptop kernel: [ 6430.314187] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
May 17 01:57:04 mplaptop kernel: [ 6430.314189] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
May 17 01:57:04 mplaptop kernel: [ 6430.314191] Process gnome-panel (pid: 5065, threadinfo ffff880116648000, task ffff8801360a8000)
May 17 01:57:04 mplaptop kernel: [ 6430.314194]  ffff880096976ea0 0000000000000001 ffff88011e65a4de ffff880116649d68
May 17 01:57:04 mplaptop kernel: [ 6430.314197] <0> ffffffff8127dc9a ffff880116649db8 ffff88012e58b800 0000000000000000
May 17 01:57:04 mplaptop kernel: [ 6430.314200] <0> ffff88013fc022a8 ffff880116649db8 ffffffff8127e7d3 ffff88012e58b818
May 17 01:57:04 mplaptop kernel: [ 6430.314206]  [<ffffffff8127dc9a>] aa_dfa_match+0x3a/0x50
May 17 01:57:04 mplaptop kernel: [ 6430.314209]  [<ffffffff8127e7d3>] aa_find_attach+0x93/0xf0
May 17 01:57:04 mplaptop kernel: [ 6430.314211]  [<ffffffff8127f80b>] apparmor_bprm_set_creds+0x36b/0x530
May 17 01:57:04 mplaptop kernel: [ 6430.314215]  [<ffffffff8108998e>] ? up_write+0xe/0x10
May 17 01:57:04 mplaptop kernel: [ 6430.314219]  [<ffffffff812507e3>] security_bprm_set_creds+0x13/0x20
May 17 01:57:04 mplaptop kernel: [ 6430.314223]  [<ffffffff81149431>] prepare_binprm+0xb1/0x110
May 17 01:57:04 mplaptop kernel: [ 6430.314225]  [<ffffffff8114a29c>] do_execve+0x1ac/0x300
May 17 01:57:04 mplaptop kernel: [ 6430.314229]  [<ffffffff812bbdda>] ? strncpy_from_user+0x4a/0x90
May 17 01:57:04 mplaptop kernel: [ 6430.314233]  [<ffffffff810115ba>] sys_execve+0x4a/0x80
May 17 01:57:04 mplaptop kernel: [ 6430.314236]  [<ffffffff8101360a>] stub_execve+0x6a/0xc0
May 17 01:57:04 mplaptop kernel: [ 6430.314265]  RSP <ffff880116649d20>
May 17 01:57:04 mplaptop kernel: [ 6430.314268] ---[ end trace 2b51de9f06402b92 ]---

Sometimes it does not seem to have visible effects, other times it renders the system unusable. When that happens, I often need to reboot several times, as the issue appears again on the next boot process. My system is an up-to-date lucid, installation mostly by default but with several dm_crypt partitions over LVM, and virtualbox-ose installed. I have also enabled the firefox apparmor profile and several other custom profiles.
Note that I am sometimes experienced another extrange apparmor behavior, as it attaches (randomly) a profile to a process that has not a profile defined (lets say, for example, it attaches the firefox profile to gedit). I experienced that 2 or 3 times, I will try to give you more information next time I see it, maybe it is related to this.
Finally, just note that this problem seems related to bug #529288.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Lucid: system becomes unstable randomly, seems related with apparmor
https://bugs.launchpad.net/bugs/581525
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