Warning: Permanently added '10.128.0.250' (ED25519) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program [ 55.459141][ T4173] [ 55.461496][ T4173] ============================================ [ 55.467637][ T4173] WARNING: possible recursive locking detected [ 55.473781][ T4173] 5.15.176-syzkaller #0 Not tainted [ 55.478966][ T4173] -------------------------------------------- [ 55.485106][ T4173] syz-executor402/4173 is trying to acquire lock: [ 55.491507][ T4173] ffff8880735881b8 (&trie->lock){..-.}-{2:2}, at: trie_delete_elem+0x90/0x690 [ 55.500399][ T4173] [ 55.500399][ T4173] but task is already holding lock: [ 55.507850][ T4173] ffff88807daa99b8 (&trie->lock){..-.}-{2:2}, at: trie_update_elem+0xcf/0xca0 [ 55.516756][ T4173] [ 55.516756][ T4173] other info that might help us debug this: [ 55.524800][ T4173] Possible unsafe locking scenario: [ 55.524800][ T4173] [ 55.532246][ T4173] CPU0 [ 55.535517][ T4173] ---- [ 55.538784][ T4173] lock(&trie->lock); [ 55.542840][ T4173] lock(&trie->lock); [ 55.546900][ T4173] [ 55.546900][ T4173] *** DEADLOCK *** [ 55.546900][ T4173] [ 55.555031][ T4173] May be due to missing lock nesting notation [ 55.555031][ T4173] [ 55.563426][ T4173] 3 locks held by syz-executor402/4173: [ 55.568961][ T4173] #0: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 55.578289][ T4173] #1: ffff88807daa99b8 (&trie->lock){..-.}-{2:2}, at: trie_update_elem+0xcf/0xca0 [ 55.587601][ T4173] #2: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 55.596908][ T4173] [ 55.596908][ T4173] stack backtrace: [ 55.602814][ T4173] CPU: 0 PID: 4173 Comm: syz-executor402 Not tainted 5.15.176-syzkaller #0 [ 55.611389][ T4173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 55.621441][ T4173] Call Trace: [ 55.624714][ T4173] [ 55.627635][ T4173] dump_stack_lvl+0x1e3/0x2d0 [ 55.632314][ T4173] ? io_uring_drop_tctx_refs+0x1a0/0x1a0 [ 55.637942][ T4173] ? panic+0x860/0x860 [ 55.642005][ T4173] validate_chain+0x46d2/0x5930 [ 55.646857][ T4173] ? reacquire_held_locks+0x660/0x660 [ 55.652241][ T4173] ? rcu_lock_release+0x5/0x20 [ 55.657004][ T4173] ? validate_chain+0x112/0x5930 [ 55.661934][ T4173] ? mark_lock+0x98/0x340 [ 55.666258][ T4173] __lock_acquire+0x1295/0x1ff0 [ 55.671105][ T4173] lock_acquire+0x1db/0x4f0 [ 55.675599][ T4173] ? trie_delete_elem+0x90/0x690 [ 55.680530][ T4173] ? mark_lock+0x98/0x340 [ 55.684849][ T4173] ? read_lock_is_recursive+0x10/0x10 [ 55.690207][ T4173] ? __lock_acquire+0x1295/0x1ff0 [ 55.695226][ T4173] _raw_spin_lock_irqsave+0xd1/0x120 [ 55.700504][ T4173] ? trie_delete_elem+0x90/0x690 [ 55.705439][ T4173] ? _raw_spin_lock+0x40/0x40 [ 55.710113][ T4173] ? read_lock_is_recursive+0x10/0x10 [ 55.715483][ T4173] trie_delete_elem+0x90/0x690 [ 55.720247][ T4173] ? __cant_sleep+0x270/0x270 [ 55.724922][ T4173] bpf_prog_2c29ac5cdc6b1842+0x3a/0xe90 [ 55.730464][ T4173] bpf_trace_run2+0x19e/0x340 [ 55.735144][ T4173] ? bpf_trace_run1+0x2f0/0x2f0 [ 55.739994][ T4173] ? trie_update_elem+0x6d8/0xca0 [ 55.745018][ T4173] ? __rwlock_init+0x140/0x140 [ 55.749779][ T4173] ? _raw_spin_lock_irqsave+0xac/0x120 [ 55.755236][ T4173] ? trie_update_elem+0x6d8/0xca0 [ 55.760261][ T4173] __bpf_trace_kfree+0x6e/0x90 [ 55.765028][ T4173] ? trie_update_elem+0x6d8/0xca0 [ 55.770047][ T4173] __traceiter_kfree+0x26/0x40 [ 55.774805][ T4173] ? trie_update_elem+0x6d8/0xca0 [ 55.779826][ T4173] kfree+0x22f/0x270 [ 55.783715][ T4173] trie_update_elem+0x6d8/0xca0 [ 55.788562][ T4173] ? migrate_enable+0x199/0x270 [ 55.793414][ T4173] bpf_map_update_value+0x5d7/0x6c0 [ 55.798610][ T4173] generic_map_update_batch+0x54d/0x8b0 [ 55.804156][ T4173] ? rcu_read_unlock+0x90/0x90 [ 55.808915][ T4173] ? __fdget+0x158/0x220 [ 55.813149][ T4173] ? rcu_read_unlock+0x90/0x90 [ 55.817995][ T4173] bpf_map_do_batch+0x4d0/0x620 [ 55.822836][ T4173] __sys_bpf+0x55c/0x670 [ 55.827100][ T4173] ? bpf_link_show_fdinfo+0x300/0x300 [ 55.832473][ T4173] ? syscall_enter_from_user_mode+0x2e/0x240 [ 55.838453][ T4173] ? lockdep_hardirqs_on+0x94/0x130 [ 55.843645][ T4173] __x64_sys_bpf+0x78/0x90 [ 55.848054][ T4173] do_syscall_64+0x3b/0xb0 [ 55.852459][ T4173] ? clear_bhb_loop+0x15/0x70 [ 55.857135][ T4173] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 55.863023][ T4173] RIP: 0033:0x7f0091978da9 [ 55.867528][ T4173] 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 [ 55.887137][ T4173] RSP: 002b:00007fffb1a39788 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 55.895544][ T4173] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0091978da9 executing program executing program executing program executing program [ 55.903509][ T4173] RDX: 0000000000000038 RSI: 00000000200001c0 RDI: 000000000000001a [ 55.911473][ T4173] RBP: 0000000000000000 R08: 00000000000000a0 R09: 00000000000000a0 [ 55.919531][ T4173] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 55.927509][ T4173] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 55.935477][ T4173] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program