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b5bf9a90bb
Gaurav reported a perceived problem with TASK_PARKED, which turned out to be a broken wait-loop pattern in __kthread_parkme(), but the reported issue can (and does) in fact happen for states that do not do condition based sleeps. When the 'current->state = TASK_RUNNING' store of a previous (concurrent) try_to_wake_up() collides with the setting of a 'special' sleep state, we can loose the sleep state. Normal condition based wait-loops are immune to this problem, but for sleep states that are not condition based are subject to this problem. There already is a fix for TASK_DEAD. Abstract that and also apply it to TASK_STOPPED and TASK_TRACED, both of which are also without condition based wait-loop. Reported-by: Gaurav Kohli <gkohli@codeaurora.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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.. | ||
autogroup.h | ||
clock.h | ||
coredump.h | ||
cpufreq.h | ||
cputime.h | ||
deadline.h | ||
debug.h | ||
hotplug.h | ||
idle.h | ||
init.h | ||
isolation.h | ||
jobctl.h | ||
loadavg.h | ||
mm.h | ||
nohz.h | ||
numa_balancing.h | ||
prio.h | ||
rt.h | ||
signal.h | ||
stat.h | ||
sysctl.h | ||
task_stack.h | ||
task.h | ||
topology.h | ||
user.h | ||
wake_q.h | ||
xacct.h |