summaryrefslogtreecommitdiffstats
path: root/block
diff options
context:
space:
mode:
authorOleg Nesterov <oleg@redhat.com>2012-10-26 19:46:06 +0200
committerTejun Heo <tj@kernel.org>2012-10-26 14:27:49 -0700
commit5d8f72b55c275677865de670fa147ed318191d81 (patch)
tree58f4f571440f412861a232ed0c5753771e5a6e58 /block
parentead5c473712eb26db792b18a4dc98fdb312883fe (diff)
freezer: change ptrace_stop/do_signal_stop to use freezable_schedule()
try_to_freeze_tasks() and cgroup_freezer rely on scheduler locks to ensure that a task doing STOPPED/TRACED -> RUNNING transition can't escape freezing. This mostly works, but ptrace_stop() does not necessarily call schedule(), it can change task->state back to RUNNING and check freezing() without any lock/barrier in between. We could add the necessary barrier, but this patch changes ptrace_stop() and do_signal_stop() to use freezable_schedule(). This fixes the race, freezer_count() and freezer_should_skip() carefully avoid the race. And this simplifies the code, try_to_freeze_tasks/update_if_frozen no longer need to use task_is_stopped_or_traced() checks with the non trivial assumptions. We can rely on the mechanism which was specially designed to mark the sleeping task as "frozen enough". v2: As Tejun pointed out, we can also change get_signal_to_deliver() and move try_to_freeze() up before 'relock' label. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions