Sebastian Andrzej Siewior 3f6b233018 futex: Acquire a hash reference in futex_wait_multiple_setup() ... futex_wait_multiple_setup() changes task_struct::__state to !TASK_RUNNING and then enqueues on multiple futexes. Every futex_q_lock() acquires a reference on the global hash which is dropped later. If a rehash is in progress then the loop will block on mm_struct::futex_hash_bucket for the rehash to complete and this will lose the previously set task_struct::__state. Acquire a reference on the local hash to avoiding blocking on mm_struct::futex_hash_bucket. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20250416162921.513656-9-bigeasy@linutronix.de		2025-05-03 12:02:06 +02:00
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core.c	futex: Create private_hash() get/put class	2025-05-03 12:02:06 +02:00
futex.h	futex: Create private_hash() get/put class	2025-05-03 12:02:06 +02:00
Makefile	futex: Split out wait/wake	2021-10-07 13:51:11 +02:00
pi.c	futex: Create futex_hash() get/put class	2025-05-03 12:02:06 +02:00
requeue.c	futex: Create futex_hash() get/put class	2025-05-03 12:02:06 +02:00
syscalls.c	futex: make futex_parse_waitv() available as a helper	2023-09-29 02:37:05 -06:00
waitwake.c	futex: Acquire a hash reference in futex_wait_multiple_setup()	2025-05-03 12:02:06 +02:00