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| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2010-11-09 15:26:56 -0500 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-11-10 08:40:53 -0500 |
| commit | f85acd81aa623e3dcf268c90e5cd8ecf36830984 (patch) | |
| tree | cb6baded85812573ad2f42bfe47b9d185b61918b /Documentation/irqflags-tracing.txt | |
| parent | 1447399b3e34af016c368b4178db7ef0e04e15b0 (diff) | |
ioprio: rcu_read_lock/unlock protect find_task_by_vpid call (V2)
Commit 4221a9918e38b7494cee341dda7b7b4bb8c04bde "Add RCU check for
find_task_by_vpid()" introduced rcu_lockdep_assert to find_task_by_pid_ns=
Assertion failed in sys_ioprio_get. The patch is fixing assertion
failure in ioprio_set as well.
kernel/pid.c:419 invoked rcu_dereference_check() without protection!
stack backtrace:
Pid: 4254, comm: iotop Not tainted
Call Trace:
[<ffffffff810656f2>] lockdep_rcu_dereference+0xaa/0xb2
[<ffffffff81053c67>] find_task_by_pid_ns+0x4f/0x68
[<ffffffff81053c9d>] find_task_by_vpid+0x1d/0x1f
[<ffffffff811104e2>] sys_ioprio_get+0x50/0x2da
[<ffffffff81002182>] system_call_fastpath+0x16/0x1b
V2: rcu critical section expanded according to comment by Paul E. McKenney
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'Documentation/irqflags-tracing.txt')
0 files changed, 0 insertions, 0 deletions