signal: Exit RCU read-side critical section on each pass through loop
The kill_pid_info() can potentially loop indefinitely if tasks are created and deleted sufficiently quickly, and if this happens, this function will remain in a single RCU read-side critical section indefinitely. This commit therefore exits the RCU read-side critical section on each pass through the loop. Because a race must happen to retry the loop, this should have no performance impact in the common case. Reported-by:Dave Jones <davej@redhat.com> Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by:
Oleg Nesterov <oleg@redhat.com> Reviewed-by:
Pranith Kumar <bobby.prani@gmail.com>
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