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| author | Mike Galbraith <efault@gmx.de> | 2010-03-26 11:11:33 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-04-02 19:30:05 +0200 |
| commit | 8bb39f9aa068262732fe44b965d7a6eb5a5a7d67 (patch) | |
| tree | 820af25532c62179f518bda83ea27b6b21ee736b /net | |
| parent | 257ef9d21f1b008a6c7425544b36641c4325a922 (diff) | |
| download | linux-3.10-8bb39f9aa068262732fe44b965d7a6eb5a5a7d67.tar.gz linux-3.10-8bb39f9aa068262732fe44b965d7a6eb5a5a7d67.tar.bz2 linux-3.10-8bb39f9aa068262732fe44b965d7a6eb5a5a7d67.zip | |
perf: Fix 'perf sched record' deadlock
perf sched record can deadlock a box should the holder of
handle->data->lock take an interrupt, and then attempt to
acquire an rq lock held by a CPU trying to acquire the
same lock. Disable interrupts.
CPU0 CPU1
sched event with rq->lock held
grab handle->data->lock
spin on handle->data->lock
interrupt
try to grab rq->lock
Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Tested-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1269598293.6174.8.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions