forked from luck/tmp_suning_uos_patched
d4e4e61d4a
commit a06247c6804f1a7c86a2e5398a4c1f1db1471848 upstream.
With write operation on psi files replacing old trigger with a new one,
the lifetime of its waitqueue is totally arbitrary. Overwriting an
existing trigger causes its waitqueue to be freed and pending poll()
will stumble on trigger->event_wait which was destroyed.
Fix this by disallowing to redefine an existing psi trigger. If a write
operation is used on a file descriptor with an already existing psi
trigger, the operation will fail with EBUSY error.
Also bypass a check for psi_disabled in the psi_trigger_destroy as the
flag can be flipped after the trigger is created, leading to a memory
leak.
Fixes:
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| .. | ||
| cgroupstats.rst | ||
| delay-accounting.rst | ||
| index.rst | ||
| psi.rst | ||
| taskstats-struct.rst | ||
| taskstats.rst | ||