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author | Bianca Lutz <sowilo@cs.tu-berlin.de> | 2011-07-13 20:13:36 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2011-07-21 18:01:51 +0200 |
commit | 99bc52429f11d1f4f81495ac8237085aaeb6bccf (patch) | |
tree | af5b2f44ceb1382b836dc9171fe296b3d35dd48d /kernel/kmod.c | |
parent | 045176d22f08bc0b650a028df0f62fc3c2747699 (diff) |
sched: Do not attempt to destroy uninitialized rt_bandwidth
If a task group is to be created and alloc_fair_sched_group() fails,
then the rt_bandwidth of the corresponding task group is not yet
initialized. The caller, sched_create_group(), starts a clean up
procedure which calls free_rt_sched_group() which unconditionally
destroys the not yet initialized rt_bandwidth.
This crashes or hangs the system in lock_hrtimer_base(): UP systems
dereference a NULL pointer, while SMP systems loop endlessly on a
condition that cannot become true.
This patch simply avoids the destruction of rt_bandwidth when the
initialization code path was not reached.
(This was discovered by accident with a custom kernel modification.)
Signed-off-by: Bianca Lutz <sowilo@cs.tu-berlin.de>
Signed-off-by: Jan Schoenherr <schnhrr@cs.tu-berlin.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1310580816-10861-7-git-send-email-schnhrr@cs.tu-berlin.de
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/kmod.c')
0 files changed, 0 insertions, 0 deletions