From: Bianca Lutz Date: Wed, 13 Jul 2011 18:13:36 +0000 (+0200) Subject: sched: Do not attempt to destroy uninitialized rt_bandwidth X-Git-Tag: v3.1-rc1~298^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99bc52429f11d1f4f81495ac8237085aaeb6bccf;p=pandora-kernel.git 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 Signed-off-by: Jan Schoenherr Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1310580816-10861-7-git-send-email-schnhrr@cs.tu-berlin.de Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed