** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: apparmor (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: apparmor (Ubuntu Yakkety)
Importance: Critical
Assignee: John Johansen (jjohansen)
Status: Incomplete
** Also affects: linux (Ubuntu Yakkety)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => Fix Committed
** Changed in: linux (Ubuntu Yakkety)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1579135
Title:
AppArmor profile reloading causes an intermittent kernel BUG
Status in apparmor package in Ubuntu:
Incomplete
Status in linux package in Ubuntu:
Fix Committed
Status in apparmor source package in Xenial:
New
Status in linux source package in Xenial:
Fix Committed
Status in apparmor source package in Yakkety:
Incomplete
Status in linux source package in Yakkety:
Fix Committed
Bug description:
First, a bit of background: I've built a go binary of the upstream
snappy integration tests, and built them into a snap so that we can
easily keep them up to date, and call them from other test suites.
I'm running through the tests in qemu on a current 16 image (built
yesteray), and hitting this most of the time with the homeInterface
Suite tests in particular. The networkInterfaceSuite tests also seem
to produce a similar problem:
sudo snap connect home-consumer:home ubuntu-core:home
[/] Connect home-consumer:home to ubuntu-core:home
home-consumer.writer /home/ubuntu/snap/snappy-tests/100001/writable
sudo snap disconnect home-consumer:home ubuntu-core:home
[ 519.416354] BUG: unable to handle kernel NULL pointer dereference at
0000000000000038
[ 519.417327] IP: [<ffffffff81388eef>] profile_cmp+0x2f/0x180
[ 519.417978] PGD 1f26a067 PUD 1aa4f067 PMD 0
[ 519.418574] Oops: 0000 [#1] SMP
[ 519.419032] Modules linked in: kvm_intel joydev kvm ppdev snd_pcm
snd_timer irqbypass snd soundcore parport_pc pcspkr input_leds floppy parport
evbug psmouse e1000 8250_fintek i2c_piix4 mac_hid pata_acpi serio_raw autofs4
nls_iso8859_1 usb_storage ahci libahci squashfs
[ 519.422747] CPU: 0 PID: 1915 Comm: apparmor_parser Tainted: G W
4.4.0-21-generic #37-Ubuntu
[ 519.423689] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
[ 519.424627] task: ffff88001d23cb00 ti: ffff88001b58c000 task.ti:
ffff88001b58c000
[ 519.425385] RIP: 0010:[<ffffffff81388eef>] [<ffffffff81388eef>]
profile_cmp+0x2f/0x180
[ 519.426242] RSP: 0018:ffff88001b58fcb0 EFLAGS: 00010086
[ 519.426791] RAX: 0000000000000000 RBX: ffff88001b1b1400 RCX:
0000000000000006
[ 519.427628] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000009
[ 519.428405] RBP: ffff88001b58fcc0 R08: 000000000000000a R09:
0000000000000274
[ 519.429127] R10: ffff88001f236890 R11: 0000000000000274 R12:
0000000000000000
[ 519.429956] R13: 000000000000000b R14: 0000000000000000 R15:
ffff88001abff950
[ 519.430957] FS: 00007f0c1609b740(0000) GS:ffff88001fc00000(0000)
knlGS:0000000000000000
[ 519.432256] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 519.433030] CR2: 0000000000000038 CR3: 000000001b14b000 CR4:
00000000000006f0
[ 519.433868] Stack:
[ 519.434204] 000000000000000c ffff88001abff9b0 ffff88001b58fd08
ffffffff8138a0c3
[ 519.435355] 000000011f2b9450 ffff88000000000c ffff88001abff950
ffff88001b1b1760
[ 519.436480] ffff88001f236848 ffff88001abff900 ffff88001f236840
ffff88001b58fd98
[ 519.437609] Call Trace:
[ 519.438007] [<ffffffff8138a0c3>] aa_vec_unique+0x163/0x240
[ 519.438709] [<ffffffff8138e337>] __aa_labelset_update_subtree+0x687/0x820
[ 519.439537] [<ffffffff813811fb>] aa_replace_profiles+0x59b/0xb70
[ 519.440268] [<ffffffff811ec5ae>] ? __kmalloc+0x22e/0x250
[ 519.440944] [<ffffffff81375f1f>] policy_update+0x9f/0x1f0
[ 519.441617] [<ffffffff81376083>] profile_replace+0x13/0x20
[ 519.442299] [<ffffffff8120bf38>] __vfs_write+0x18/0x40
[ 519.443032] [<ffffffff8120c8c9>] vfs_write+0xa9/0x1a0
[ 519.443721] [<ffffffff8120b85f>] ? do_sys_open+0x1bf/0x2a0
[ 519.444416] [<ffffffff8120d585>] SyS_write+0x55/0xc0
[ 519.445042] [<ffffffff818244f2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 519.445802] Code: 00 55 48 85 ff 48 89 e5 41 54 53 49 89 f4 48 89 fb 0f 84
8b 00 00 00 4d 85 e4 0f 84 aa 00 00 00 48 83 7b 38 00 0f 84 c9 00 00 00 <49> 83
7c 24 38 00 0f 84 e8 00 00 00 48 83 7b 08 00 0f 84 07 01
[ 519.451336] RIP [<ffffffff81388eef>] profile_cmp+0x2f/0x180
[ 519.452088] RSP <ffff88001b58fcb0>
[ 519.452570] CR2: 0000000000000038
[ 519.453032] ---[ end trace 65ff12ee2e7c26af ]---
The details of this test can be found at:
https://github.com/ubuntu-core/snappy/tree/master/integration-tests/data/snaps/home-consumer
Will follow up with more details
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