Hi, with the current cryptodev-2.6 tree and the Linus rc-2 tree, I get the following during boot: [ 0.837048] ============================= [ 0.837079] [ BUG: Invalid wait context ] [ 0.837079] 5.11.0-rc1+ #215 Not tainted [ 0.837079] ----------------------------- [ 0.837079] cryptomgr_test/137 is trying to lock: [ 0.837079] ffffffff914e8e98 (depot_lock){..-.}-{3:3}, at: stack_depot_save+0x1c8/0x4e0 [ 0.837079] other info that might help us debug this: [ 0.837079] context-{5:5} [ 0.837079] 2 locks held by cryptomgr_test/137: [ 0.837079] #0: ffffffff910aaa00 (rcu_read_lock){....}-{1:3}, at: __queue_work+0x65/0x8e0 [ 0.837079] #1: ffff88807ea34fd8 (&pool->lock){....}-{2:2}, at: __queue_work+0x244/0x8e0 [ 0.837079] stack backtrace: [ 0.837079] CPU: 1 PID: 137 Comm: cryptomgr_test Not tainted 5.11.0-rc1+ #215 [ 0.837079] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014 [ 0.837079] Call Trace: [ 0.837079] dump_stack+0x9a/0xcc [ 0.837079] __lock_acquire.cold+0xdd/0x345 [ 0.837079] ? stack_trace_call+0xd3/0x5a0 [ 0.837079] ? deref_stack_reg+0x93/0xb0 [ 0.837079] ? preempt_count_sub+0x14/0xc0 [ 0.837079] ? lockdep_hardirqs_on_prepare+0x230/0x230 [ 0.837079] ? preempt_count_sub+0x14/0xc0 [ 0.837079] ? unwind_next_frame+0x235/0xb80 [ 0.837079] ? ret_from_fork+0x1f/0x30 [ 0.837079] lock_acquire+0x241/0x650 [ 0.837079] ? stack_depot_save+0x1c8/0x4e0 [ 0.837079] ? lock_release+0x440/0x440 [ 0.837079] ? arch_stack_walk+0x88/0xf0 [ 0.837079] ? ret_from_fork+0x1f/0x30 [ 0.837079] _raw_spin_lock_irqsave+0x3e/0x60 [ 0.837079] ? stack_depot_save+0x1c8/0x4e0 [ 0.837079] stack_depot_save+0x1c8/0x4e0 [ 0.837079] kasan_save_stack+0x32/0x40 [ 0.837079] ? kasan_save_stack+0x1b/0x40 [ 0.837079] ? kasan_record_aux_stack+0xb7/0xe0 [ 0.837079] ? insert_work+0x2d/0x130 [ 0.837079] ? __queue_work+0x36d/0x8e0 [ 0.837079] ? queue_work_on+0x78/0x80 [ 0.837079] ? alg_test.cold+0xbb/0xc0 [ 0.837079] ? cryptomgr_test+0x36/0x60 [ 0.837079] ? kthread+0x213/0x240 [ 0.837079] ? ret_from_fork+0x1f/0x30 [ 0.837079] ? lockdep_hardirqs_on_prepare+0x230/0x230 [ 0.837079] ? lockdep_hardirqs_on_prepare+0x230/0x230 [ 0.837079] ? cryptomgr_test+0x36/0x60 [ 0.837079] ? ret_from_fork+0x1f/0x30 [ 0.837079] ? lock_acquire+0x241/0x650 [ 0.837079] ? lock_release+0x440/0x440 [ 0.837079] ? lock_release+0x440/0x440 [ 0.837079] ? do_raw_spin_lock+0x119/0x1b0 [ 0.837079] ? rwlock_bug.part.0+0x60/0x60 [ 0.837079] kasan_record_aux_stack+0xb7/0xe0 [ 0.837079] insert_work+0x2d/0x130 [ 0.837079] __queue_work+0x36d/0x8e0 [ 0.837079] ? rcu_read_lock_sched_held+0x3f/0x70 [ 0.837079] queue_work_on+0x78/0x80 [ 0.837079] alg_test.cold+0xbb/0xc0 [ 0.837079] ? test_cipher+0x330/0x330 [ 0.837079] ? __kthread_parkme+0x66/0xf0 [ 0.837079] ? lock_downgrade+0x3b0/0x3b0 [ 0.837079] ? mark_held_locks+0x24/0x90 [ 0.837079] ? lockdep_hardirqs_on_prepare+0x133/0x230 [ 0.837079] ? _raw_spin_unlock_irqrestore+0x47/0x60 [ 0.837079] ? lockdep_hardirqs_on+0x79/0x100 [ 0.837079] ? preempt_count_sub+0x14/0xc0 [ 0.837079] ? crypto_acomp_scomp_free_ctx+0x70/0x70 [ 0.837079] cryptomgr_test+0x36/0x60 [ 0.837079] kthread+0x213/0x240 [ 0.837079] ? kthread_create_worker_on_cpu+0xd0/0xd0 [ 0.837079] ret_from_fork+0x1f/0x30 I will also have a look into this. Ciao Stephan