Warning: Permanently added '10.128.1.62' (ED25519) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 73.248238][ T4324] [ 73.250619][ T4324] ============================================ [ 73.256754][ T4324] WARNING: possible recursive locking detected [ 73.262911][ T4324] 6.1.140-syzkaller #0 Not tainted [ 73.268023][ T4324] -------------------------------------------- [ 73.274260][ T4324] syz-executor131/4324 is trying to acquire lock: [ 73.280740][ T4324] ffffc900048010d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x1c4/0x5a0 [ 73.290445][ T4324] [ 73.290445][ T4324] but task is already holding lock: [ 73.297816][ T4324] ffffc900047e10d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x1c4/0x5a0 [ 73.307484][ T4324] [ 73.307484][ T4324] other info that might help us debug this: [ 73.315533][ T4324] Possible unsafe locking scenario: [ 73.315533][ T4324] [ 73.322996][ T4324] CPU0 [ 73.326336][ T4324] ---- [ 73.329625][ T4324] lock(&rb->spinlock); [ 73.333869][ T4324] lock(&rb->spinlock); [ 73.338108][ T4324] [ 73.338108][ T4324] *** DEADLOCK *** [ 73.338108][ T4324] [ 73.346249][ T4324] May be due to missing lock nesting notation [ 73.346249][ T4324] [ 73.354560][ T4324] 4 locks held by syz-executor131/4324: [ 73.360099][ T4324] #0: ffff88802393ed38 (&tsk->futex_exit_mutex){+.+.}-{3:3}, at: futex_exit_release+0x2f/0x1c0 [ 73.370548][ T4324] #1: ffffffff8c92ab20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xda/0x3b0 [ 73.379890][ T4324] #2: ffffc900047e10d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x1c4/0x5a0 [ 73.389898][ T4324] #3: ffffffff8c92ab20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xda/0x3b0 [ 73.399209][ T4324] [ 73.399209][ T4324] stack backtrace: [ 73.405108][ T4324] CPU: 0 PID: 4324 Comm: syz-executor131 Not tainted 6.1.140-syzkaller #0 [ 73.413604][ T4324] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 73.423667][ T4324] Call Trace: [ 73.426946][ T4324] [ 73.429874][ T4324] dump_stack_lvl+0x168/0x22e [ 73.434605][ T4324] ? show_regs_print_info+0x12/0x12 [ 73.439832][ T4324] ? load_image+0x3b0/0x3b0 [ 73.444342][ T4324] __lock_acquire+0x122f/0x7c50 [ 73.449220][ T4324] ? unwind_get_return_address+0x49/0x80 [ 73.454873][ T4324] ? verify_lock_unused+0x140/0x140 [ 73.460088][ T4324] ? verify_lock_unused+0x140/0x140 [ 73.465395][ T4324] ? verify_lock_unused+0x140/0x140 [ 73.470680][ T4324] ? mark_lock+0x94/0x320 [ 73.475021][ T4324] ? mark_lock+0x94/0x320 [ 73.479443][ T4324] lock_acquire+0x1b4/0x490 [ 73.483947][ T4324] ? __bpf_ringbuf_reserve+0x1c4/0x5a0 [ 73.489414][ T4324] ? read_lock_is_recursive+0x10/0x10 [ 73.494786][ T4324] ? verify_lock_unused+0x140/0x140 [ 73.499979][ T4324] ? __lock_acquire+0x12e5/0x7c50 [ 73.505210][ T4324] _raw_spin_lock_irqsave+0xa4/0xf0 [ 73.510420][ T4324] ? __bpf_ringbuf_reserve+0x1c4/0x5a0 [ 73.515886][ T4324] ? _raw_spin_lock+0x40/0x40 [ 73.520580][ T4324] ? register_lock_class+0xb1/0x860 [ 73.525801][ T4324] __bpf_ringbuf_reserve+0x1c4/0x5a0 [ 73.531117][ T4324] ? bpf_ringbuf_notify+0x20/0x20 [ 73.536160][ T4324] ? __cant_sleep+0x210/0x210 [ 73.540859][ T4324] ? __lock_acquire+0x13c0/0x7c50 [ 73.545893][ T4324] bpf_ringbuf_output+0x65/0x1e0 [ 73.550839][ T4324] bpf_prog_a3e2825f60354855+0x3d/0x41 [ 73.556303][ T4324] bpf_trace_run2+0x1cd/0x3b0 [ 73.560985][ T4324] ? bpf_trace_run2+0xda/0x3b0 [ 73.565750][ T4324] ? bpf_trace_run1+0x3b0/0x3b0 [ 73.570600][ T4324] ? verify_lock_unused+0x140/0x140 [ 73.575830][ T4324] ? __bpf_trace_contention_begin+0x10/0x10 [ 73.581719][ T4324] __traceiter_contention_end+0x74/0xa0 [ 73.587263][ T4324] trace_contention_end+0x13f/0x190 [ 73.592511][ T4324] __pv_queued_spin_lock_slowpath+0x7e8/0x9c0 [ 73.598654][ T4324] ? __pv_queued_spin_unlock_slowpath+0x290/0x290 [ 73.605098][ T4324] queued_spin_lock_slowpath+0x43/0x50 [ 73.610667][ T4324] do_raw_spin_lock+0x217/0x280 [ 73.615534][ T4324] ? __rwlock_init+0x140/0x140 [ 73.620305][ T4324] _raw_spin_lock_irqsave+0xb0/0xf0 [ 73.625527][ T4324] ? _raw_spin_lock+0x40/0x40 [ 73.630216][ T4324] __bpf_ringbuf_reserve+0x1c4/0x5a0 [ 73.635513][ T4324] ? bpf_ringbuf_notify+0x20/0x20 [ 73.640553][ T4324] ? verify_lock_unused+0x140/0x140 [ 73.645752][ T4324] ? __cant_sleep+0x210/0x210 [ 73.650433][ T4324] ? mark_lock+0x94/0x320 [ 73.654764][ T4324] bpf_ringbuf_output+0x65/0x1e0 [ 73.659709][ T4324] bpf_prog_a3e2825f60354855+0x3d/0x41 [ 73.665336][ T4324] bpf_trace_run2+0x1cd/0x3b0 [ 73.670030][ T4324] ? bpf_trace_run2+0xda/0x3b0 [ 73.674959][ T4324] ? bpf_trace_run1+0x3b0/0x3b0 [ 73.679822][ T4324] ? __mutex_trylock_common+0x14f/0x250 [ 73.685382][ T4324] ? __bpf_trace_contention_begin+0x10/0x10 [ 73.691292][ T4324] __traceiter_contention_end+0x74/0xa0 [ 73.696858][ T4324] trace_contention_end+0x123/0x170 [ 73.702074][ T4324] __mutex_lock+0x194/0xaf0 [ 73.706581][ T4324] ? lockdep_hardirqs_on_prepare+0x3fc/0x760 [ 73.712576][ T4324] ? futex_exit_release+0x2f/0x1c0 [ 73.717704][ T4324] ? lock_chain_count+0x20/0x20 [ 73.722568][ T4324] ? mutex_lock_nested+0x10/0x10 [ 73.727513][ T4324] ? _raw_spin_unlock_irq+0x1f/0x40 [ 73.732732][ T4324] ? lockdep_hardirqs_on+0x94/0x140 [ 73.737934][ T4324] ? _raw_spin_unlock_irq+0x2a/0x40 [ 73.743130][ T4324] ? acct_collect+0x588/0x730 [ 73.747805][ T4324] futex_exit_release+0x2f/0x1c0 [ 73.752751][ T4324] exit_mm_release+0x16/0x30 [ 73.757420][ T4324] exit_mm+0xa4/0x2c0 [ 73.761400][ T4324] ? do_exit+0x2400/0x2400 [ 73.765833][ T4324] ? taskstats_exit+0x35a/0x9d0 [ 73.770701][ T4324] do_exit+0x8b9/0x2400 [ 73.774897][ T4324] ? put_task_struct+0x80/0x80 [ 73.779693][ T4324] ? lockdep_hardirqs_on_prepare+0x3fc/0x760 [ 73.785689][ T4324] ? lock_chain_count+0x20/0x20 [ 73.790548][ T4324] ? _raw_spin_lock_irq+0xab/0xe0 [ 73.795573][ T4324] ? _raw_spin_lock_irqsave+0xf0/0xf0 [ 73.800941][ T4324] ? lockdep_hardirqs_on_prepare+0x3fc/0x760 [ 73.806917][ T4324] ? _raw_spin_unlock_irq+0x1f/0x40 [ 73.812129][ T4324] ? lockdep_hardirqs_on+0x94/0x140 [ 73.817326][ T4324] do_group_exit+0x217/0x2d0 [ 73.822004][ T4324] __x64_sys_exit_group+0x3b/0x40 [ 73.827027][ T4324] do_syscall_64+0x4c/0xa0 [ 73.831461][ T4324] ? clear_bhb_loop+0x60/0xb0 [ 73.836128][ T4324] ? clear_bhb_loop+0x60/0xb0 [ 73.840818][ T4324] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 73.846715][ T4324] RIP: 0033:0x7f27d8cd6139 [ 73.851124][ T4324] Code: 90 49 c7 c0 b8 ff ff ff be e7 00 00 00 ba 3c 00 00 00 eb 12 0f 1f 44 00 00 89 d0 0f 05 48 3d 00 f0 ff ff 77 1c f4 89 f0 0f 05 <48> 3d 00 f0 ff ff 76 e7 f7 d8 64 41 89 00 eb df 0f 1f 80 00 00 00 [ 73.870737][ T4324] RSP: 002b:00007fffca656c98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 73.879150][ T4324] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f27d8cd6139 [ 73.887136][ T4324] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 executing program executing program executing program executing program executing program executing program [ 73.895122][ T4324] RBP: 00007f27d8d512b0 R08: ffffffffffffffb8 R09: 00000000000000a0 [ 73.903089][ T4324] R10: 0000200000000108 R11: 0000000000000246 R12: 00007f27d8d512b0 [ 73.911053][ T4324] R13: 0000000000000000 R14: 00007f27d8d51d20 R15: 00007f27d8ca72e0 [ 73.919027][ T4324] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program