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| author | Tejun Heo <tj@kernel.org> | 2016-05-25 11:48:25 -0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-05-25 11:48:25 -0400 |
| commit | 4f996e234dad488e5d9ba0858bc1bae12eff82c3 (patch) | |
| tree | 882a932c3883968a9276598fd536ab43413083fd /kernel | |
| parent | 28165ec7a99be98123aa89540bf2cfc24df19498 (diff) | |
| download | op-kernel-dev-4f996e234dad488e5d9ba0858bc1bae12eff82c3.zip op-kernel-dev-4f996e234dad488e5d9ba0858bc1bae12eff82c3.tar.gz | |
percpu: fix synchronization between chunk->map_extend_work and chunk destruction
Atomic allocations can trigger async map extensions which is serviced
by chunk->map_extend_work. pcpu_balance_work which is responsible for
destroying idle chunks wasn't synchronizing properly against
chunk->map_extend_work and may end up freeing the chunk while the work
item is still in flight.
This patch fixes the bug by rolling async map extension operations
into pcpu_balance_work.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Reported-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Cc: stable@vger.kernel.org # v3.18+
Fixes: 9c824b6a172c ("percpu: make sure chunk->map array has available space")
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions
