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exec: Remove BUG_ON(has_group_leader_pid)

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With the introduction of exchange_tids thread_group_leader and
has_group_leader_pid have become equivalent.  Further at this point in the
code a thread group has exactly two threads, the previous thread_group_leader
that is waiting to be reaped and tsk.  So we know it is impossible for tsk to
be the thread_group_leader.

This is also the last user of has_group_leader_pid so removing this check
will allow has_group_leader_pid to be removed.

So remove the "BUG_ON(has_group_leader_pid)" that will never fire.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2020-04-26 07:51:03 -05:00
parent c7f5194054
commit 610b818856
1 changed files with 0 additions and 1 deletions
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fs/exec.c
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@ -1176,7 +1176,6 @@ static int de_thread(struct task_struct *tsk)
tsk->start_boottime = leader->start_boottime;
BUG_ON(!same_thread_group(leader, tsk));
BUG_ON(has_group_leader_pid(tsk));
/*
* An exec() starts a new thread group with the
* TGID of the previous thread group. Rehash the