============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
kworker/u8:7/1172 is trying to acquire lock:
ffffe8ffffd761c0 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
ffffe8ffffd761c0 (&pd_list->lock){+...}-{3:3}, at: padata_find_next kernel/padata.c:256 [inline]
ffffe8ffffd761c0 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:313 [inline]
ffffe8ffffd761c0 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x70a/0xb80 kernel/padata.c:383

but task is already holding lock:
ffffe8ffffc76948 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
ffffe8ffffc76948 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:304 [inline]
ffffe8ffffc76948 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x590/0xb80 kernel/padata.c:383

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&pd_list->lock);
  lock(&pd_list->lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

6 locks held by kworker/u8:7/1172:
 #0: ffff888146295138 ((wq_completion)pencrypt_parallel){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
 #0: ffff888146295138 ((wq_completion)pencrypt_parallel){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
 #1: ffffc90004a67ba0 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
 #1: ffffc90004a67ba0 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
 #2: ffffffff8d44aca0 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0xa1/0x540 kernel/softirq.c:163
 #3: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0xa1/0x540 kernel/softirq.c:163
 #4: ffffe8ffffc76948 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
 #4: ffffe8ffffc76948 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:304 [inline]
 #4: ffffe8ffffc76948 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x590/0xb80 kernel/padata.c:383
 #5: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #5: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #5: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #5: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1c1/0x3e0 kernel/locking/spinlock_rt.c:57

stack backtrace:
CPU: 0 UID: 0 PID: 1172 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: pencrypt_parallel padata_parallel_worker
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3895
 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 rt_spin_lock+0x88/0x3e0 kernel/locking/spinlock_rt.c:56
 spin_lock include/linux/spinlock_rt.h:44 [inline]
 padata_find_next kernel/padata.c:256 [inline]
 padata_reorder kernel/padata.c:313 [inline]
 padata_do_serial+0x70a/0xb80 kernel/padata.c:383
 padata_parallel_worker+0x75/0x1d0 kernel/padata.c:157
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>