DUID 00:04:89:05:98:7d:bd:cb:ea:8e:b7:3c:a9:5c:45:de:a2:b6 forked to background, child pid 3174 [ 32.188112][ T3175] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.200048][ T3175] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.151' (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 syzkaller login: [ 50.882660][ C0] [ 50.885132][ C0] ============================================ [ 50.891274][ C0] WARNING: possible recursive locking detected [ 50.897549][ C0] 5.15.156-syzkaller #0 Not tainted [ 50.902830][ C0] -------------------------------------------- [ 50.908970][ C0] ksoftirqd/0/14 is trying to acquire lock: [ 50.914856][ C0] ffff88807d1c91c0 (&stab->lock){+.-.}-{2:2}, at: sock_map_delete_elem+0x161/0x230 [ 50.924256][ C0] [ 50.924256][ C0] but task is already holding lock: [ 50.931610][ C0] ffff88807d1c91c0 (&stab->lock){+.-.}-{2:2}, at: sock_map_delete_elem+0x161/0x230 [ 50.940905][ C0] [ 50.940905][ C0] other info that might help us debug this: [ 50.948952][ C0] Possible unsafe locking scenario: [ 50.948952][ C0] [ 50.956392][ C0] CPU0 [ 50.959659][ C0] ---- [ 50.962925][ C0] lock(&stab->lock); [ 50.966986][ C0] lock(&stab->lock); [ 50.971042][ C0] [ 50.971042][ C0] *** DEADLOCK *** [ 50.971042][ C0] [ 50.979256][ C0] May be due to missing lock nesting notation [ 50.979256][ C0] [ 50.987651][ C0] 5 locks held by ksoftirqd/0/14: [ 50.992772][ C0] #0: ffffffff8c91fbe0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire+0x0/0x20 [ 51.002077][ C0] #1: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 51.011467][ C0] #2: ffff88807d1c91c0 (&stab->lock){+.-.}-{2:2}, at: sock_map_delete_elem+0x161/0x230 [ 51.021288][ C0] #3: ffff88807961a290 (&psock->link_lock){+.-.}-{2:2}, at: sock_map_unref+0xcc/0x5d0 [ 51.030941][ C0] #4: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 51.040365][ C0] [ 51.040365][ C0] stack backtrace: [ 51.046249][ C0] CPU: 0 PID: 14 Comm: ksoftirqd/0 Not tainted 5.15.156-syzkaller #0 [ 51.054305][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 51.064370][ C0] Call Trace: [ 51.067641][ C0] [ 51.070564][ C0] dump_stack_lvl+0x1e3/0x2d0 [ 51.075242][ C0] ? io_uring_drop_tctx_refs+0x1a0/0x1a0 [ 51.080869][ C0] ? panic+0x860/0x860 [ 51.085037][ C0] validate_chain+0x46d2/0x5930 [ 51.089887][ C0] ? rcu_is_watching+0x11/0xa0 [ 51.094647][ C0] ? check_path+0x21/0x40 [ 51.098973][ C0] ? check_noncircular+0x1e1/0x3b0 [ 51.104078][ C0] ? reacquire_held_locks+0x660/0x660 [ 51.109444][ C0] ? lockdep_unlock+0x166/0x300 [ 51.114284][ C0] ? lockdep_lock+0x2a0/0x2a0 [ 51.118953][ C0] ? reacquire_held_locks+0x660/0x660 [ 51.124315][ C0] ? validate_chain+0x13bd/0x5930 [ 51.129332][ C0] ? mark_lock+0x98/0x340 [ 51.133653][ C0] __lock_acquire+0x1295/0x1ff0 [ 51.138504][ C0] lock_acquire+0x1db/0x4f0 [ 51.142996][ C0] ? sock_map_delete_elem+0x161/0x230 [ 51.148370][ C0] ? read_lock_is_recursive+0x10/0x10 [ 51.153735][ C0] ? sock_map_delete_elem+0x161/0x230 [ 51.159100][ C0] ? __bpf_trace_softirq+0x10/0x10 [ 51.164207][ C0] ? sock_map_delete_elem+0x161/0x230 [ 51.169576][ C0] _raw_spin_lock_bh+0x31/0x40 [ 51.174334][ C0] ? sock_map_delete_elem+0x161/0x230 [ 51.179700][ C0] sock_map_delete_elem+0x161/0x230 [ 51.184894][ C0] ? sock_map_update_elem+0x380/0x380 [ 51.190266][ C0] bpf_prog_8a405b5ced52e191+0x42/0x8d8 [ 51.195805][ C0] bpf_trace_run2+0x19e/0x340 [ 51.200476][ C0] ? bpf_trace_run1+0x2f0/0x2f0 [ 51.205327][ C0] ? sock_map_unref+0x3ac/0x5d0 [ 51.210172][ C0] ? do_raw_spin_lock+0x14a/0x370 [ 51.215193][ C0] ? __bpf_trace_softirq+0x10/0x10 [ 51.220295][ C0] ? sock_map_unref+0x3ac/0x5d0 [ 51.225139][ C0] __bpf_trace_kfree+0x6e/0x90 [ 51.229900][ C0] ? sock_map_unref+0x3ac/0x5d0 [ 51.234745][ C0] kfree+0x22f/0x270 [ 51.238637][ C0] ? sock_map_unref+0xcc/0x5d0 [ 51.243422][ C0] sock_map_unref+0x3ac/0x5d0 [ 51.248097][ C0] sock_map_delete_elem+0x191/0x230 [ 51.253288][ C0] ? sock_map_update_elem+0x380/0x380 [ 51.258659][ C0] ? bpf_trace_run2+0xe7/0x340 [ 51.263421][ C0] bpf_prog_8a405b5ced52e191+0x42/0x8d8 [ 51.268956][ C0] bpf_trace_run2+0x19e/0x340 [ 51.273630][ C0] ? bpf_trace_run1+0x2f0/0x2f0 [ 51.278475][ C0] ? security_task_free+0x96/0xc0 [ 51.283494][ C0] ? rcu_lock_release+0x5/0x20 [ 51.288251][ C0] ? __lock_acquire+0x1ff0/0x1ff0 [ 51.293266][ C0] ? security_task_free+0x96/0xc0 [ 51.298302][ C0] ? put_task_struct_rcu_user+0x90/0x90 [ 51.303846][ C0] __bpf_trace_kfree+0x6e/0x90 [ 51.308606][ C0] ? security_task_free+0x96/0xc0 [ 51.313711][ C0] kfree+0x22f/0x270 [ 51.317601][ C0] ? put_task_struct_rcu_user+0x90/0x90 [ 51.323141][ C0] security_task_free+0x96/0xc0 [ 51.327988][ C0] __put_task_struct+0xf4/0x2b0 [ 51.332849][ C0] rcu_core+0xa15/0x1650 [ 51.337090][ C0] ? local_bh_disable+0x20/0x20 [ 51.341934][ C0] ? run_ksoftirqd+0xc1/0x120 [ 51.346605][ C0] ? rcu_qs+0xed/0x190 [ 51.350672][ C0] ? rcu_softirq_qs+0x2b0/0x2b0 [ 51.355518][ C0] ? lockdep_hardirqs_on_prepare+0x438/0x7a0 [ 51.361493][ C0] ? print_irqtrace_events+0x210/0x210 [ 51.366945][ C0] ? rcu_softirq_qs+0x75/0x2b0 [ 51.371789][ C0] ? rcu_get_gp_kthreads_prio+0x10/0x10 [ 51.377332][ C0] __do_softirq+0x3b3/0x93a [ 51.382186][ C0] ? run_ksoftirqd+0xc1/0x120 [ 51.386860][ C0] ? __entry_text_end+0x1fe9f7/0x1fe9f7 [ 51.392401][ C0] ? preempt_schedule_common+0xa6/0xd0 [ 51.397855][ C0] ? run_ksoftirqd+0xa3/0x120 [ 51.402527][ C0] ? lockdep_hardirqs_off+0x70/0x100 [ 51.407809][ C0] run_ksoftirqd+0xc1/0x120 [ 51.412307][ C0] ? ksoftirqd_should_run+0x20/0x20 [ 51.417586][ C0] ? ksoftirqd_should_run+0x20/0x20 [ 51.422774][ C0] smpboot_thread_fn+0x51b/0x9d0 [ 51.427708][ C0] kthread+0x3f6/0x4f0 [ 51.431768][ C0] ? cpu_report_death+0x180/0x180 [ 51.436785][ C0] ? kthread_blkcg+0xd0/0xd0 [ 51.441369][ C0] ret_from_fork+0x1f/0x30 [ 51.445786][ C0]