Messages in this thread | | | Date | Mon, 7 Nov 2022 17:30:16 +0100 | From | Jan Kara <> | Subject | Re: Crash with PREEMPT_RT on aarch64 machine |
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On Mon 07-11-22 16:10:34, Sebastian Andrzej Siewior wrote: > + locking, arm64 > > On 2022-11-07 14:56:36 [+0100], Jan Kara wrote: > > > spinlock_t and raw_spinlock_t differ slightly in terms of locking. > > > rt_spin_lock() has the fast path via try_cmpxchg_acquire(). If you > > > enable CONFIG_DEBUG_RT_MUTEXES then you would force the slow path which > > > always acquires the rt_mutex_base::wait_lock (which is a raw_spinlock_t) > > > while the actual lock is modified via cmpxchg. > > > > So I've tried enabling CONFIG_DEBUG_RT_MUTEXES and indeed the corruption > > stops happening as well. So do you suspect some bug in the CPU itself? > > If it is only enabling CONFIG_DEBUG_RT_MUTEXES (and not whole lockdep) > then it looks very suspicious.
Just to confirm, CONFIG_DEBUG_RT_MUTEXES is the only thing I've enabled and the list corruption disappeared.
Honza
-- Jan Kara <jack@suse.com> SUSE Labs, CR
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