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| author | Eric W. Biederman <ebiederm@xmission.com> | 2020-02-28 11:15:03 -0600 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-03-04 09:54:55 +0100 |
| commit | b95e31c07c5eb4f5c0769f12b38b0343d7961040 (patch) | |
| tree | b46651b5891959200b4effb93354d0f0db521e0c /kernel/exit.c | |
| parent | 55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 (diff) | |
| download | lwn-b95e31c07c5eb4f5c0769f12b38b0343d7961040.tar.gz lwn-b95e31c07c5eb4f5c0769f12b38b0343d7961040.zip | |
posix-cpu-timers: Stop disabling timers on mt-exec
The reasons why the extra posix_cpu_timers_exit_group() invocation has been
added are not entirely clear from the commit message. Today all that
posix_cpu_timers_exit_group() does is stop timers that are tracking the
task from firing. Every other operation on those timers is still allowed.
The practical implication of this is posix_cpu_timer_del() which could
not get the siglock after the thread group leader has exited (because
sighand == NULL) would be able to run successfully because the timer
was already dequeued.
With that locking issue fixed there is no point in disabling all of the
timers. So remove this ``tempoary'' hack.
Fixes: e0a70217107e ("posix-cpu-timers: workaround to suppress the problems with mt exec")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/87o8tityzs.fsf@x220.int.ebiederm.org
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 2833ffb0c211..df546315f699 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -103,17 +103,8 @@ static void __exit_signal(struct task_struct *tsk) #ifdef CONFIG_POSIX_TIMERS posix_cpu_timers_exit(tsk); - if (group_dead) { + if (group_dead) posix_cpu_timers_exit_group(tsk); - } else { - /* - * This can only happen if the caller is de_thread(). - * FIXME: this is the temporary hack, we should teach - * posix-cpu-timers to handle this case correctly. - */ - if (unlikely(has_group_leader_pid(tsk))) - posix_cpu_timers_exit_group(tsk); - } #endif if (group_dead) { |