============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
kworker/u4:7/4507 is trying to acquire lock:
ffff0000e06a71e8 (
rlock-AF_UNIX
){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
){+.+.}-{2:2}, at: unix_collect_skb+0x144/0x4a8 net/unix/garbage.c:413

but task is already holding lock:
ffff0000e06a59e8
 (
rlock-AF_UNIX){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
rlock-AF_UNIX){+.+.}-{2:2}, at: unix_collect_skb+0xa8/0x4a8 net/unix/garbage.c:405

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

       CPU0
       ----
  lock(rlock-AF_UNIX);
  lock(rlock-AF_UNIX
);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

4 locks held by kworker/u4:7/4507:
 #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
 #1: ffff800021e57c40 (unix_gc_work){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
 #2: ffff800018b522d8 (unix_gc_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffff800018b522d8 (unix_gc_lock){+.+.}-{2:2}, at: __unix_gc+0xd4/0xe30 net/unix/garbage.c:589
 #3: ffff0000e06a59e8 (rlock-AF_UNIX){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #3: ffff0000e06a59e8 (rlock-AF_UNIX){+.+.}-{2:2}, at: unix_collect_skb+0xa8/0x4a8 net/unix/garbage.c:405

stack backtrace:
CPU: 1 PID: 4507 Comm: kworker/u4:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: events_unbound __unix_gc
dump_backtrace(regs = 0000000000000000 tsk = 0000000000000000)
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 print_deadlock_bug+0x454/0x5c8 kernel/locking/lockdep.c:3040
 check_deadlock kernel/locking/lockdep.c:3090 [inline]
 validate_chain kernel/locking/lockdep.c:3884 [inline]
 __lock_acquire+0x6020/0x7280 kernel/locking/lockdep.c:5171
 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 unix_collect_skb+0x144/0x4a8 net/unix/garbage.c:413
 unix_walk_scc_fast net/unix/garbage.c:572 [inline]
 __unix_gc+0x210/0xe30 net/unix/garbage.c:599
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854