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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? > [ 253.877983] ? cpuset_cpus_allowed_fallback+0x27/0x250 > [ 253.877983] cpuset_cpus_allowed_fallback+0x15d/0x250 > [ 253.877983] select_fallback_rq+0x1d8/0x250 > [ 253.877983] ? __pfx___balance_push_cpu_stop+0x10/0x10 > [ 253.877983] __balance_push_cpu_stop+0x4f/0x200 > [ 253.877983] cpu_stopper_thread+0x147/0x210 > [ 253.877983] ? __pfx_cpu_stopper_thread+0x10/0x10 > [ 253.877983] smpboot_thread_fn+0x24c/0x390 > [ 253.877983] ? __pfx_smpboot_thread_fn+0x10/0x10 > [ 253.877983] kthread+0x1fa/0x230 > [ 253.877983] ? __pfx_smpboot_thread_fn+0x10/0x10 > [ 253.877983] ? __pfx_kthread+0x10/0x10 > [ 253.877983] ret_from_fork+0x157/0x2c0 > [ 253.877983] ? __pfx_kthread+0x10/0x10 > [ 253.877983] ret_from_fork_asm+0x1a/0x30 > [ 253.877983] -- Cheers, Harry / Hyeonggon