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This bug surfaced when starting ~50 LXC container with LXD in parallel
multiple times:
# Create the containers
for c in c foo{1..50}; do lxc launch images:ubuntu/xenial $c; done
# Exectute this loop multiple times until you observe errors.
for c in c foo{1..50}; do lxc restart $c & done
After this you can
ps aux | grep apparmor
and you should see output similar to:
root 19774 0.0 0.0 12524 1116 pts/1 S+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo30
root 19775 0.0 0.0 12524 1208 pts/1 S+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo26
root 19776 0.0 0.0 13592 3224 pts/1 D+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo30
root 19778 0.0 0.0 13592 3384 pts/1 D+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo26
root 19780 0.0 0.0 12524 1208 pts/1 S+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo43
root 19782 0.0 0.0 12524 1208 pts/1 S+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo34
root 19783 0.0 0.0 13592 3388 pts/1 D+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo43
root 19784 0.0 0.0 13592 3252 pts/1 D+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo34
root 19794 0.0 0.0 12524 1208 pts/1 S+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo25
root 19795 0.0 0.0 13592 3256 pts/1 D+ 20:14 0:00
apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache
/var/lib/lxd/security/apparmor/profiles/lxd-foo25
apparmor_parser remains stuck even after all LXC/LXD commands have
exited.
dmesg output yields lines like:
[41902.815174] audit: type=1400 audit(1480191089.678:43):
apparmor="STATUS" operation="profile_load" profile="unconfined" name
="lxd-foo30_</var/lib/lxd>" pid=12545 comm="apparmor_parser"
and cat /proc/12545/stack shows:
[<ffffffff8c9b9378>] aa_remove_profiles+0x88/0x270
21:19 brauner [<ffffffff8c9ac3e4>] profile_remove+0x144/0x2e0
21:19 brauner [<ffffffff8c8319b8>] __vfs_write+0x18/0x40
21:19 brauner [<ffffffff8c832108>] vfs_write+0xb8/0x1b0
21:19 brauner [<ffffffff8c833565>] SyS_write+0x55/0xc0
21:19 brauner [<ffffffff8ce952f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
21:19 brauner [<ffffffffffffffff>] 0xffffffffffffffff
This looks like a potential kernel bug.
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
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apparmor_parser hangs indefinitely when called by multiple threads
https://bugs.launchpad.net/bugs/1645037
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