============================================
WARNING: possible recursive locking detected
6.14.0-syzkaller-g8582d9ab3efd #0 Not tainted
--------------------------------------------
syz.7.410/7871 is trying to acquire lock:
ffffc900043bd0d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x20e/0x650 kernel/bpf/ringbuf.c:423

but task is already holding lock:
ffffc900044290d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x20e/0x650 kernel/bpf/ringbuf.c:423

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

       CPU0
       ----
  lock(&rb->spinlock);
  lock(&rb->spinlock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz.7.410/7871:
 #0: ffffffff8ed3df60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8ed3df60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8ed3df60 (rcu_read_lock){....}-{1:3}, at: bpf_test_timer_enter+0x19/0x140 net/bpf/test_run.c:40
 #1: ffffc900044290d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x20e/0x650 kernel/bpf/ringbuf.c:423
 #2: ffffffff8ed3df60 (rcu_read_lock){....}-{1:3}, at: trace_call_bpf+0xb9/0x8a0 kernel/trace/bpf_trace.c:-1

stack backtrace:
CPU: 1 UID: 0 PID: 7871 Comm: syz.7.410 Not tainted 6.14.0-syzkaller-g8582d9ab3efd #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x2be/0x2d0 kernel/locking/lockdep.c:3042
 check_deadlock kernel/locking/lockdep.c:3094 [inline]
 validate_chain+0x928/0x24e0 kernel/locking/lockdep.c:3896
 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd8/0x130 kernel/locking/spinlock.c:162
 __bpf_ringbuf_reserve+0x20e/0x650 kernel/bpf/ringbuf.c:423
 ____bpf_ringbuf_output kernel/bpf/ringbuf.c:549 [inline]
 bpf_ringbuf_output+0x67/0x1e0 kernel/bpf/ringbuf.c:539
 bpf_prog_4aaef4562453526c+0x43/0x47
 bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline]
 __bpf_prog_run include/linux/filter.h:718 [inline]
 bpf_prog_run include/linux/filter.h:725 [inline]
 bpf_prog_run_array include/linux/bpf.h:2215 [inline]
 trace_call_bpf+0x36a/0x8a0 kernel/trace/bpf_trace.c:146
 perf_trace_run_bpf_submit+0x82/0x180 kernel/events/core.c:10807
 do_perf_trace_lock include/trace/events/lock.h:50 [inline]
 perf_trace_lock+0x39c/0x4a0 include/trace/events/lock.h:50
 __do_trace_lock_release include/trace/events/lock.h:69 [inline]
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x3b4/0x3e0 kernel/locking/lockdep.c:5877
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
 _raw_spin_unlock_irqrestore+0x7a/0x140 kernel/locking/spinlock.c:194
 __bpf_ringbuf_reserve+0x4c5/0x650 kernel/bpf/ringbuf.c:461
 ____bpf_ringbuf_output kernel/bpf/ringbuf.c:549 [inline]
 bpf_ringbuf_output+0x67/0x1e0 kernel/bpf/ringbuf.c:539
 bpf_prog_57b54d9cadb5579e+0x4b/0x4f
 __bpf_prog_run include/linux/filter.h:718 [inline]
 bpf_prog_run_xdp include/net/xdp.h:653 [inline]
 bpf_test_run+0x4aa/0xa90 net/bpf/test_run.c:432
 bpf_prog_test_run_xdp+0x7de/0x1200 net/bpf/test_run.c:1318
 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4427
 __sys_bpf+0x4ee/0x8b0 kernel/bpf/syscall.c:5852
 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5939 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5939
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fef69b8e169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fef6a972038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fef69db6160 RCX: 00007fef69b8e169
RDX: 0000000000000050 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007fef69c10a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fef69db6160 R15: 00007ffde5e2b508
 </TASK>