Public bug reported:
Binary package hint: apparmor
ii apparmor 2.3.1+1403-0ubuntu27.2
User-space parser utility for AppArmor
ii linux-source 2.6.31.15.28
Linux kernel source with Ubuntu patches
Apparmor in 2.6.31.15.28 (and earlier karmic kernels) apparently is not
safe for use with CONFIG_PREEMPT. Kernels with CONFIG_PREEMPT_VOLUNTARY
seem to be OK.
With CONFIG_PREEMPT I get "scheduling while atomic". Sometimes with a
non-fatal oops, sometime with a hard crash.
Happens both on i386 and x86-64, both with unicore and multicore machines.
Example from a single-core i386 machine:
[ 49.647818] BUG: scheduling while atomic: named/3964/0x00000002
[ 49.648030] Pid: 3964, comm: named Not tainted 2.6.31.4 #1Oct 30 03:29:42
server kernel: [ 49.648030] Call Trace:Oct 30 03:29:42 server kernel: [
49.648030] [<c123f255>] ? schedule+0x435/0x4d0
[ 49.648030] [<c103f55a>] ? commit_creds+0xda/0x160
[ 49.648030] [<c100301a>] ? work_resched+0x5/0x1a
[ 49.648585] __ratelimit: 9 callbacks suppressed
[ 49.648599] named[3964]: segfault at 402480 ip 00402480 sp bfb308ac error 4
[ 49.648631] note: named[3964] exited with preempt_count 1
[ 365.576949] BUG: scheduling while atomic: named/5101/0x00000003
[ 365.577033] Pid: 5101, comm: named Not tainted 2.6.31.4 #1
[ 365.577033] Call Trace:
[ 365.577033] [<c123f255>] ? schedule+0x435/0x4d0
[ 365.577033] [<c103f55a>] ? commit_creds+0xda/0x160
[ 365.577033] [<c100301a>] ? work_resched+0x5/0x1a
[ 365.577713] named[5101]: segfault at 3f4480 ip 003f4480 sp bf84877c error 4
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
--
Not preempt-safe
https://bugs.launchpad.net/bugs/486127
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