Warning: Permanently added '10.128.0.171' (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 [ 65.469202][ T4180] [ 65.471582][ T4180] ============================================ [ 65.477731][ T4180] WARNING: possible recursive locking detected [ 65.483917][ T4180] 5.15.180-syzkaller #0 Not tainted [ 65.489107][ T4180] -------------------------------------------- [ 65.495249][ T4180] syz-executor212/4180 is trying to acquire lock: [ 65.501653][ T4180] ffff88802025c9b8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x90/0x690 [ 65.510657][ T4180] [ 65.510657][ T4180] but task is already holding lock: [ 65.518020][ T4180] ffff8880735171b8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcf/0xca0 [ 65.526898][ T4180] [ 65.526898][ T4180] other info that might help us debug this: [ 65.534956][ T4180] Possible unsafe locking scenario: [ 65.534956][ T4180] [ 65.542398][ T4180] CPU0 [ 65.545672][ T4180] ---- [ 65.548946][ T4180] lock(&trie->lock); [ 65.553024][ T4180] lock(&trie->lock); [ 65.557105][ T4180] [ 65.557105][ T4180] *** DEADLOCK *** [ 65.557105][ T4180] [ 65.565258][ T4180] May be due to missing lock nesting notation [ 65.565258][ T4180] [ 65.573572][ T4180] 3 locks held by syz-executor212/4180: [ 65.579285][ T4180] #0: ffffffff8cb1f560 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 65.588765][ T4180] #1: ffff8880735171b8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcf/0xca0 [ 65.598099][ T4180] #2: ffffffff8cb1f560 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 65.607424][ T4180] [ 65.607424][ T4180] stack backtrace: [ 65.613331][ T4180] CPU: 1 PID: 4180 Comm: syz-executor212 Not tainted 5.15.180-syzkaller #0 [ 65.621931][ T4180] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 65.631998][ T4180] Call Trace: [ 65.635280][ T4180] [ 65.638210][ T4180] dump_stack_lvl+0x1e3/0x2d0 [ 65.642907][ T4180] ? io_uring_drop_tctx_refs+0x1a0/0x1a0 [ 65.648544][ T4180] ? panic+0x860/0x860 [ 65.652618][ T4180] validate_chain+0x46d2/0x5930 [ 65.657480][ T4180] ? validate_chain+0x112/0x5930 [ 65.662422][ T4180] ? unwind_next_frame+0x1437/0x1fa0 [ 65.667713][ T4180] ? deref_stack_reg+0xbe/0x110 [ 65.672570][ T4180] ? reacquire_held_locks+0x660/0x660 [ 65.677945][ T4180] ? is_bpf_text_address+0x24f/0x260 [ 65.683233][ T4180] ? stack_trace_save+0x1c0/0x1c0 [ 65.688263][ T4180] ? unwind_get_return_address+0x49/0x80 [ 65.693911][ T4180] ? mark_lock+0x98/0x340 [ 65.698252][ T4180] __lock_acquire+0x1295/0x1ff0 [ 65.703239][ T4180] lock_acquire+0x1db/0x4f0 [ 65.707746][ T4180] ? trie_delete_elem+0x90/0x690 [ 65.712688][ T4180] ? mark_lock+0x98/0x340 [ 65.717021][ T4180] ? read_lock_is_recursive+0x10/0x10 [ 65.722392][ T4180] ? __lock_acquire+0x1295/0x1ff0 [ 65.727429][ T4180] _raw_spin_lock_irqsave+0xd1/0x120 [ 65.732721][ T4180] ? trie_delete_elem+0x90/0x690 [ 65.737663][ T4180] ? _raw_spin_lock+0x40/0x40 [ 65.742341][ T4180] ? read_lock_is_recursive+0x10/0x10 [ 65.747713][ T4180] ? is_bpf_text_address+0x24f/0x260 [ 65.753004][ T4180] trie_delete_elem+0x90/0x690 [ 65.757773][ T4180] ? __cant_sleep+0x270/0x270 [ 65.762453][ T4180] ? arch_stack_walk+0xf3/0x140 [ 65.767415][ T4180] bpf_prog_d46ba5bef82912c0+0x3d/0xc14 [ 65.772961][ T4180] bpf_trace_run4+0x1ea/0x390 [ 65.777643][ T4180] ? bpf_trace_run3+0x380/0x380 [ 65.782499][ T4180] ? __alloc_pages+0x700/0x700 [ 65.787269][ T4180] __bpf_trace_mm_page_alloc+0xba/0xe0 [ 65.792734][ T4180] __traceiter_mm_page_alloc+0x35/0x50 [ 65.798197][ T4180] __alloc_pages+0x6e0/0x700 [ 65.802792][ T4180] ? __rmqueue_pcplist+0x23a0/0x23a0 [ 65.808123][ T4180] ? __lock_acquire+0x1ff0/0x1ff0 [ 65.813152][ T4180] ? alloc_pages+0x458/0x570 [ 65.817744][ T4180] new_slab+0xbb/0x4b0 [ 65.821821][ T4180] ___slab_alloc+0x6f6/0xe10 [ 65.826415][ T4180] ? bpf_map_kmalloc_node+0xdb/0x160 [ 65.831708][ T4180] __kmalloc_node+0x1fa/0x390 [ 65.836391][ T4180] ? bpf_map_kmalloc_node+0xdb/0x160 [ 65.841674][ T4180] ? _raw_spin_lock+0x40/0x40 [ 65.846357][ T4180] bpf_map_kmalloc_node+0xdb/0x160 [ 65.851473][ T4180] trie_update_elem+0x8fc/0xca0 [ 65.856336][ T4180] bpf_map_update_value+0x5d7/0x6c0 [ 65.861542][ T4180] generic_map_update_batch+0x54d/0x8b0 [ 65.867097][ T4180] ? rcu_read_unlock+0x90/0x90 [ 65.871865][ T4180] ? __fdget+0x158/0x220 [ 65.876112][ T4180] ? rcu_read_unlock+0x90/0x90 [ 65.880883][ T4180] bpf_map_do_batch+0x4d0/0x620 [ 65.885760][ T4180] __sys_bpf+0x55c/0x670 [ 65.890005][ T4180] ? bpf_link_show_fdinfo+0x300/0x300 [ 65.895384][ T4180] ? syscall_enter_from_user_mode+0x2e/0x240 [ 65.901367][ T4180] ? lockdep_hardirqs_on+0x94/0x130 [ 65.906575][ T4180] __x64_sys_bpf+0x78/0x90 [ 65.911001][ T4180] do_syscall_64+0x3b/0xb0 [ 65.915418][ T4180] ? clear_bhb_loop+0x15/0x70 [ 65.920102][ T4180] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 65.926009][ T4180] RIP: 0033:0x7f1131fc40e9 [ 65.930431][ T4180] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 [ 65.950038][ T4180] RSP: 002b:00007ffcc6adb878 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 65.958468][ T4180] RAX: ffffffffffffffda RBX: 00002000000000c0 RCX: 00007f1131fc40e9 executing program executing program executing program executing program executing program [ 65.966441][ T4180] RDX: 0000000000000038 RSI: 0000200000000240 RDI: 000000000000001a [ 65.974415][ T4180] RBP: 0000200000000440 R08: 0000000000000000 R09: 00000000000000a0 [ 65.982386][ T4180] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 65.990354][ T4180] R13: 0000200000000240 R14: 00002000000000c8 R15: 0000200000000240 [ 65.998335][ T4180] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program