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author | Tejun Heo <tj@kernel.org> | 2011-03-23 10:37:00 +0100 |
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committer | Tejun Heo <tj@kernel.org> | 2011-03-23 10:37:00 +0100 |
commit | 39efa3ef3a376a4e53de2f82fc91182459d34200 (patch) | |
tree | f75a44fa77396edcf74e41686912554f96681340 /fs/exec.c | |
parent | e5c1902e9260a0075ea52cb5ef627a8d9aaede89 (diff) | |
download | linux-3.10-39efa3ef3a376a4e53de2f82fc91182459d34200.tar.gz linux-3.10-39efa3ef3a376a4e53de2f82fc91182459d34200.tar.bz2 linux-3.10-39efa3ef3a376a4e53de2f82fc91182459d34200.zip |
signal: Use GROUP_STOP_PENDING to stop once for a single group stop
Currently task->signal->group_stop_count is used to decide whether to
stop for group stop. However, if there is a task in the group which
is taking a long time to stop, other tasks which are continued by
ptrace would repeatedly stop for the same group stop until the group
stop is complete.
Conversely, if a ptraced task is in TASK_TRACED state, the debugger
won't get notified of group stops which is inconsistent compared to
the ptraced task in any other state.
This patch introduces GROUP_STOP_PENDING which tracks whether a task
is yet to stop for the group stop in progress. The flag is set when a
group stop starts and cleared when the task stops the first time for
the group stop, and consulted whenever whether the task should
participate in a group stop needs to be determined. Note that now
tasks in TASK_TRACED also participate in group stop.
This results in the following behavior changes.
* For a single group stop, a ptracer would see at most one stop
reported.
* A ptracee in TASK_TRACED now also participates in group stop and the
tracer would get the notification. However, as a ptraced task could
be in TASK_STOPPED state or any ptrace trap could consume group
stop, the notification may still be missing. These will be
addressed with further patches.
* A ptracee may start a group stop while one is still in progress if
the tracer let it continue with stop signal delivery. Group stop
code handles this correctly.
Oleg:
* Spotted that a task might skip signal check even when its
GROUP_STOP_PENDING is set. Fixed by updating
recalc_sigpending_tsk() to check GROUP_STOP_PENDING instead of
group_stop_count.
* Pointed out that task->group_stop should be cleared whenever
task->signal->group_stop_count is cleared. Fixed accordingly.
* Pointed out the behavior inconsistency between TASK_TRACED and
RUNNING and the last behavior change.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Diffstat (limited to 'fs/exec.c')
-rw-r--r-- | fs/exec.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/exec.c b/fs/exec.c index 5e62d26a4fe..8328beb9016 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1659,6 +1659,7 @@ static int zap_process(struct task_struct *start, int exit_code) t = start; do { + task_clear_group_stop_pending(t); if (t != current && t->mm) { sigaddset(&t->pending.signal, SIGKILL); signal_wake_up(t, 1); |