** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/798860
Title:
AppArmor: BUG: sleeping function called from invalid context
Status in linux package in Ubuntu:
Won't Fix
Status in linux source package in Lucid:
Expired
Status in linux source package in Maverick:
Expired
Status in linux source package in Natty:
Expired
Bug description:
SRU Justification:
Impact: Results in hard lock on tasklist_lock, ie. system freeze
Fix: Upstream commit 1780f2d3839a0d3eb85ee014a708f9e2c8f8ba0e
2.6.38 stable commit ???pending???
Test Case: run the attached test from the apparmor regression test
suite
===
AppArmor is doing a GFP_KERNEL allocation in apparmor_task_setrlimit,
which MAY sleep while a spin lock is being held.
BUG: sleeping function called from invalid context at mm/slub.c:847
in_atomic(): 1, irqs_disabled(): 0, pid: 1583, name: cupsd
2 locks held by cupsd/1583:
#0: (tasklist_lock){.+.+.+}, at: [<ffffffff8104dafa>] do_prlimit+0x61/0x189
#1: (&(&p->alloc_lock)->rlock){+.+.+.}, at: [<ffffffff8104db2d>]
do_prlimit+0x94/0x189
Pid: 1583, comm: cupsd Not tainted 3.0.0-rc2-git1 #7
Call Trace:
[<ffffffff8102ebf2>] __might_sleep+0x10d/0x112
[<ffffffff810e6f46>] slab_pre_alloc_hook.isra.49+0x2d/0x33
[<ffffffff810e7bc4>] kmem_cache_alloc+0x22/0x132
[<ffffffff8105b6e6>] prepare_creds+0x35/0xe4
[<ffffffff811c0675>] aa_replace_current_profile+0x35/0xb2
[<ffffffff811c4d2d>] aa_current_profile+0x45/0x4c
[<ffffffff811c4d4d>] apparmor_task_setrlimit+0x19/0x3a
[<ffffffff811beaa5>] security_task_setrlimit+0x11/0x13
[<ffffffff8104db6b>] do_prlimit+0xd2/0x189
[<ffffffff8104dea9>] sys_setrlimit+0x3b/0x48
[<ffffffff814062bb>] system_call_fastpath+0x16/0x1b
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