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| author |   Peter Zijlstra <peterz@infradead.org> | 2010-06-28 16:51:01 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2010-06-28 18:21:30 +0200 |
| commit | b433c3d4549ae74935b585115f076c6fb7bc48fe (patch) | |
| tree | fa69951fe2dcdfed7482976d6d6fc0a0bd5d1d5d /drivers/gpu/drm | |
| parent | sched: Prevent compiler from optimising the sched_avg_update() loop (diff) | |
| download | linux-dev-b433c3d4549ae74935b585115f076c6fb7bc48fe.tar.xz linux-dev-b433c3d4549ae74935b585115f076c6fb7bc48fe.zip | |
init, sched: Fix race between init and kthreadd
Ilya reported that on a very slow machine he could reliably
reproduce a race between forking init and kthreadd. We first
fork init so that it obtains pid-1, however since the scheduler
is already fully running at this point it can preempt and run
the init thread before we spawn and set kthreadd_task.
The init thread can then attempt spawning kthreads without
kthreadd being present which results in an OOPS.
Reported-by: Ilya Loginov <isloginov@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1277736661.3561.110.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/gpu/drm')
0 files changed, 0 insertions, 0 deletions