============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
kworker/u8:4/60 is trying to acquire lock:
ffffe8ffffd6c028 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffffe8ffffd6c028 (&pd_list->lock){+...}-{3:3}, at: padata_find_next kernel/padata.c:256 [inline]
ffffe8ffffd6c028 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:313 [inline]
ffffe8ffffd6c028 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x707/0xb80 kernel/padata.c:383

but task is already holding lock:
ffffe8ffffd6c5a8 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffffe8ffffd6c5a8 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:304 [inline]
ffffe8ffffd6c5a8 (&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

3 locks held by kworker/u8:4/60:
 #0: ffff88801d3ab948 ((wq_completion)pencrypt_parallel){+.+.}-{0:0}, at: process_one_work+0x841/0x15d0 kernel/workqueue.c:3242
 #1: ffffc9000211fb80 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15d0 kernel/workqueue.c:3243
 #2: ffffe8ffffd6c5a8 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffffe8ffffd6c5a8 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:304 [inline]
 #2: ffffe8ffffd6c5a8 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x590/0xb80 kernel/padata.c:383

stack backtrace:
CPU: 1 UID: 0 PID: 60 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 padata_find_next kernel/padata.c:256 [inline]
 padata_reorder kernel/padata.c:313 [inline]
 padata_do_serial+0x707/0xb80 kernel/padata.c:383
 padata_parallel_worker+0x75/0x1d0 kernel/padata.c:157
 process_one_work+0x94a/0x15d0 kernel/workqueue.c:3267
 process_scheduled_works kernel/workqueue.c:3350 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3431
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>