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 0zWITNNP 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McKenney wrote: > On Wed, Jan 21, 2026 at 04:17:24PM +0900, Harry Yoo wrote: > > On Wed, Jan 21, 2026 at 04:06:25PM +0900, Harry Yoo wrote: > > > On Tue, Jan 20, 2026 at 09:41:14PM -0800, Paul E. McKenney wrote: > > > > Hello, Vlastimil, > > > > > > > > On the off-chance that this is useful new news. This happened in > > > > rcutorture's TREE04 scenario running with KCSAN and lockdep enabled. > > > > > > > > Thoughts? > > > > > > > > Thanx, Paul > > > > > > > > ------------------------------------------------------------------------ > > > > > > > > [ 253.872153] ============================= > > > > [ 253.872271] [ BUG: Invalid wait context ] > > > > [ 253.872271] 6.19.0-rc6-next-20260120 #21508 Not tainted > > > > [ 253.875774] ----------------------------- > > > > [ 253.877983] migration/1/23 is trying to lock: > > > > [ 253.877983] ffff8afd01054e98 (&barn->lock){..-.}-{3:3}, at: barn_get_empty_sheaf+0x1d/0xb0 > > > > [ 253.877983] other info that might help us debug this: > > > > [ 253.877983] context-{5:5} > > > > [ 253.877983] 3 locks held by migration/1/23: > > > > [ 253.877983] #0: ffff8afd01fd89a8 (&p->pi_lock){-.-.}-{2:2}, at: __balance_push_cpu_stop+0x3f/0x200 > > > > [ 253.877983] #1: ffffffff9f15c5c8 (rcu_read_lock){....}-{1:3}, at: cpuset_cpus_allowed_fallback+0x27/0x250 > > > > [ 253.877983] #2: ffff8afd1f470be0 ((local_lock_t *)&pcs->lock){+.+.}-{3:3}, at: __kfree_rcu_sheaf+0x52/0x3d0 > > > > [ 253.877983] stack backtrace: > > > > [ 253.877983] CPU: 1 UID: 0 PID: 23 Comm: migration/1 Not tainted 6.19.0-rc6-next-20260120 #21508 PREEMPTLAZY > > > > [ 253.877983] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 > > > > [ 253.877983] Stopper: __balance_push_cpu_stop+0x0/0x200 <- balance_push+0x118/0x170 > > > > [ 253.877983] Call Trace: > > > > [ 253.877983] > > > > [ 253.877983] __dump_stack+0x22/0x30 > > > > [ 253.877983] dump_stack_lvl+0x60/0x80 > > > > [ 253.877983] dump_stack+0x19/0x24 > > > > [ 253.877983] __lock_acquire+0xd3a/0x28e0 > > > > [ 253.877983] ? __lock_acquire+0x5a9/0x28e0 > > > > [ 253.877983] ? __lock_acquire+0x5a9/0x28e0 > > > > [ 253.877983] ? barn_get_empty_sheaf+0x1d/0xb0 > > > > [ 253.877983] lock_acquire+0xc3/0x270 > > > > [ 253.877983] ? barn_get_empty_sheaf+0x1d/0xb0 > > > > [ 253.877983] ? __kfree_rcu_sheaf+0x52/0x3d0 > > > > [ 253.877983] _raw_spin_lock_irqsave+0x47/0x70 > > > > [ 253.877983] ? barn_get_empty_sheaf+0x1d/0xb0 > > > > [ 253.877983] barn_get_empty_sheaf+0x1d/0xb0 > > > > [ 253.877983] ? __kfree_rcu_sheaf+0x52/0x3d0 > > > > [ 253.877983] __kfree_rcu_sheaf+0x19f/0x3d0 > > > > [ 253.877983] kvfree_call_rcu+0xaf/0x390 > > > > [ 253.877983] set_cpus_allowed_force+0xc8/0xf0 > > > > > > set_cpus_allowed_force() is calling kfree_rcu() with a raw spinlock > > > (pi_lock) held, but barn->lock is normal spinlock, lockdep prints an > > > error because on PREEMPT_RT normal spinlocks are converted to > > > sleeping locks but raw spinlocks are not. > > > > > > Hmm... but it isn't great to convert barn->lock to > > > a raw spinlock just because of this? > > > > No, on PREEMPT_RT kfree_call_rcu() doesn't use sheaves. > > Is it benign and it's simply due to PROVE_RAW_LOCK_NESTING? > > Unless your kernel is built with CONFIG_PREEMPT_RT=y, in which case it > is a real bug that could call schedule() with preemption disabled. Right, but it's fine because this path is never called with CONFIG_PREEMPT_RT=y. Yesterday sent a fix to suppress this warning. Thanks for reporting it, Paul! -- Cheers, Harry / Hyeonggon