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17 May 2024, 11:00:25 UTC
Revision 8fb335e078378c8426fabeed1ebee1fbf915690c authored by Andrei Vagin on 01 February 2019, 22:20:24 UTC, committed by Linus Torvalds on 01 February 2019, 23:46:23 UTC 
kernel/exit.c: release ptraced tasks before zap_pid_ns_processes
 
Currently, exit_ptrace() adds all ptraced tasks in a dead list, then
zap_pid_ns_processes() waits on all tasks in a current pidns, and only
then are tasks from the dead list released.

zap_pid_ns_processes() can get stuck on waiting tasks from the dead
list.  In this case, we will have one unkillable process with one or
more dead children.

Thanks to Oleg for the advice to release tasks in find_child_reaper().

Link: http://lkml.kernel.org/r/20190110175200.12442-1-avagin@gmail.com
Fixes: 7c8bd2322c7f ("exit: ptrace: shift "reap dead" code from exit_ptrace() to forget_original_parent()")
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent a8e911d
History
Tip revision: 8fb335e078378c8426fabeed1ebee1fbf915690c authored by Andrei Vagin on 01 February 2019, 22:20:24 UTC
kernel/exit.c: release ptraced tasks before zap_pid_ns_processes
Tip revision: 8fb335e
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