Warning: Permanently added '10.128.0.173' (ED25519) to the list of known hosts. executing program executing program [ 62.983269][ T4168] [ 62.985664][ T4168] ============================================ [ 62.991804][ T4168] WARNING: possible recursive locking detected [ 62.997947][ T4168] 5.15.175-syzkaller #0 Not tainted [ 63.003140][ T4168] -------------------------------------------- [ 63.009285][ T4168] syz-executor260/4168 is trying to acquire lock: [ 63.015782][ T4168] ffff88801e2f15b8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x90/0x690 [ 63.024718][ T4168] [ 63.024718][ T4168] but task is already holding lock: [ 63.032089][ T4168] ffff88807a1159b8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcf/0xca0 [ 63.040964][ T4168] [ 63.040964][ T4168] other info that might help us debug this: [ 63.049014][ T4168] Possible unsafe locking scenario: [ 63.049014][ T4168] [ 63.056461][ T4168] CPU0 [ 63.059747][ T4168] ---- [ 63.063091][ T4168] lock(&trie->lock); [ 63.067154][ T4168] lock(&trie->lock); [ 63.071215][ T4168] [ 63.071215][ T4168] *** DEADLOCK *** [ 63.071215][ T4168] [ 63.079352][ T4168] May be due to missing lock nesting notation [ 63.079352][ T4168] [ 63.087662][ T4168] 3 locks held by syz-executor260/4168: [ 63.093198][ T4168] #0: ffffffff8cb1fd20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 63.102600][ T4168] #1: ffff88807a1159b8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcf/0xca0 [ 63.112029][ T4168] #2: ffffffff8cb1fd20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 63.121362][ T4168] [ 63.121362][ T4168] stack backtrace: [ 63.127259][ T4168] CPU: 0 PID: 4168 Comm: syz-executor260 Not tainted 5.15.175-syzkaller #0 [ 63.135848][ T4168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 63.146023][ T4168] Call Trace: [ 63.149314][ T4168] [ 63.152240][ T4168] dump_stack_lvl+0x1e3/0x2d0 [ 63.156929][ T4168] ? io_uring_drop_tctx_refs+0x1a0/0x1a0 [ 63.162557][ T4168] ? panic+0x860/0x860 [ 63.166889][ T4168] validate_chain+0x46d2/0x5930 [ 63.171748][ T4168] ? reacquire_held_locks+0x660/0x660 [ 63.177129][ T4168] ? is_bpf_text_address+0x24f/0x260 [ 63.182425][ T4168] ? stack_trace_save+0x1c0/0x1c0 [ 63.187452][ T4168] ? __kernel_text_address+0x94/0x100 [ 63.192824][ T4168] ? unwind_get_return_address+0x49/0x80 [ 63.198461][ T4168] ? stack_trace_save+0x113/0x1c0 [ 63.203486][ T4168] ? mark_lock+0x98/0x340 [ 63.207814][ T4168] __lock_acquire+0x1295/0x1ff0 [ 63.212666][ T4168] lock_acquire+0x1db/0x4f0 [ 63.217173][ T4168] ? trie_delete_elem+0x90/0x690 [ 63.222112][ T4168] ? mark_lock+0x98/0x340 [ 63.226440][ T4168] ? read_lock_is_recursive+0x10/0x10 [ 63.231806][ T4168] ? __lock_acquire+0x1295/0x1ff0 [ 63.236834][ T4168] _raw_spin_lock_irqsave+0xd1/0x120 [ 63.242120][ T4168] ? trie_delete_elem+0x90/0x690 [ 63.247058][ T4168] ? _raw_spin_lock+0x40/0x40 [ 63.251732][ T4168] ? read_lock_is_recursive+0x10/0x10 [ 63.257100][ T4168] trie_delete_elem+0x90/0x690 [ 63.261861][ T4168] ? __cant_sleep+0x270/0x270 [ 63.266547][ T4168] bpf_prog_8c8ab8634bca3061+0x3a/0xfc8 [ 63.272104][ T4168] bpf_trace_run4+0x1ea/0x390 [ 63.276795][ T4168] ? bpf_trace_run3+0x380/0x380 [ 63.281666][ T4168] __bpf_trace_mm_page_alloc+0xba/0xe0 [ 63.287154][ T4168] __alloc_pages+0x6e0/0x700 [ 63.291742][ T4168] ? __rmqueue_pcplist+0x23a0/0x23a0 [ 63.297026][ T4168] ? do_raw_spin_lock+0x14a/0x370 [ 63.302052][ T4168] kmalloc_large_node+0x7c/0x180 [ 63.306986][ T4168] ? _raw_spin_lock_irqsave+0xac/0x120 [ 63.312447][ T4168] __kmalloc_node+0x22d/0x390 [ 63.317120][ T4168] ? _raw_spin_lock_irqsave+0xdd/0x120 [ 63.322586][ T4168] ? _raw_spin_lock+0x40/0x40 [ 63.327410][ T4168] bpf_map_kmalloc_node+0xdb/0x160 [ 63.332539][ T4168] trie_update_elem+0x1d7/0xca0 [ 63.337392][ T4168] ? asm_exc_page_fault+0x22/0x30 [ 63.342421][ T4168] bpf_map_update_value+0x5d7/0x6c0 [ 63.347734][ T4168] map_update_elem+0x6a0/0x7c0 [ 63.352542][ T4168] __sys_bpf+0x2fd/0x670 [ 63.356796][ T4168] ? bpf_link_show_fdinfo+0x2d0/0x2d0 [ 63.362188][ T4168] ? syscall_enter_from_user_mode+0x2e/0x240 [ 63.368169][ T4168] ? lockdep_hardirqs_on+0x94/0x130 [ 63.373369][ T4168] __x64_sys_bpf+0x78/0x90 [ 63.377791][ T4168] do_syscall_64+0x3b/0xb0 [ 63.382211][ T4168] ? clear_bhb_loop+0x15/0x70 [ 63.386882][ T4168] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 63.392773][ T4168] RIP: 0033:0x7fe212905d69 [ 63.397187][ T4168] 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 [ 63.416793][ T4168] RSP: 002b:00007ffee79678c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 63.425210][ T4168] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe212905d69 executing program executing program executing program executing program [ 63.433305][ T4168] RDX: 0000000000000020 RSI: 0000000020000000 RDI: 0000000000000002 [ 63.441477][ T4168] RBP: 00000000000f4240 R08: 00000000000000a0 R09: 00000000000000a0 [ 63.449468][ T4168] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 63.457623][ T4168] R13: 00007ffee7967ae8 R14: 00007ffee79678f0 R15: 00007ffee79678e0 [ 63.465616][ T4168] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program