./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor201173445 <...> Warning: Permanently added '10.128.0.141' (ED25519) to the list of known hosts. execve("./syz-executor201173445", ["./syz-executor201173445"], 0x7ffeae9ff770 /* 10 vars */) = 0 brk(NULL) = 0x555560c97000 brk(0x555560c97d00) = 0x555560c97d00 arch_prctl(ARCH_SET_FS, 0x555560c97380) = 0 set_tid_address(0x555560c97650) = 5070 set_robust_list(0x555560c97660, 24) = 0 rseq(0x555560c97ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor201173445", 4096) = 27 getrandom("\x33\xa9\x2e\xfb\x9c\x98\xab\x73", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555560c97d00 brk(0x555560cb8d00) = 0x555560cb8d00 brk(0x555560cb9000) = 0x555560cb9000 mprotect(0x7f0d70ef6000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=5, value_size=2, max_entries=4, map_flags=BPF_F_NO_PREALLOC|BPF_F_NUMA_NODE, inner_map_fd=-1, numa_node=0, map_name="", map_ifindex=0, btf_fd=-1, btf_key_type_id=0, btf_value_type_id=0, btf_vmlinux_value_type_id=0, map_extra=0}, 72) = 3 bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_RAW_TRACEPOINT, insn_cnt=12, insns=0x20000440, license="GPL", log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0, prog_name="", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=-1, func_info_rec_size=0, func_info=NULL, func_info_cnt=0, line_info_rec_size=0, line_info=NULL, line_info_cnt=0, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = 4 bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="mm_page_alloc", prog_fd=4}}, 16) = 5 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=9, value_size=65537, max_entries=9, map_flags=BPF_F_NO_PREALLOC, inner_map_fd=-1, map_name="", map_ifindex=0, btf_fd=-1, btf_key_type_id=0, btf_value_type_id=0, btf_vmlinux_value_type_id=0, map_extra=0}, 72) = 6 [ 72.184784][ T5070] [ 72.187165][ T5070] ============================================ [ 72.193313][ T5070] WARNING: possible recursive locking detected [ 72.199455][ T5070] 6.8.0-syzkaller-05242-g32fa4366cc4d #0 Not tainted [ 72.206138][ T5070] -------------------------------------------- [ 72.212288][ T5070] syz-executor201/5070 is trying to acquire lock: [ 72.218704][ T5070] ffff888021a381f8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 72.227606][ T5070] [ 72.227606][ T5070] but task is already holding lock: [ 72.234961][ T5070] ffff888021a389f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcb/0xc10 [ 72.243843][ T5070] [ 72.243843][ T5070] other info that might help us debug this: [ 72.251896][ T5070] Possible unsafe locking scenario: [ 72.251896][ T5070] [ 72.259336][ T5070] CPU0 [ 72.262608][ T5070] ---- [ 72.265878][ T5070] lock(&trie->lock); [ 72.269946][ T5070] lock(&trie->lock); [ 72.274011][ T5070] [ 72.274011][ T5070] *** DEADLOCK *** [ 72.274011][ T5070] [ 72.282155][ T5070] May be due to missing lock nesting notation [ 72.282155][ T5070] [ 72.290476][ T5070] 3 locks held by syz-executor201/5070: [ 72.296025][ T5070] #0: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_map_update_value+0x3c4/0x540 [ 72.305955][ T5070] #1: ffff888021a389f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcb/0xc10 [ 72.315264][ T5070] #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16e/0x490 [ 72.324661][ T5070] [ 72.324661][ T5070] stack backtrace: [ 72.330541][ T5070] CPU: 1 PID: 5070 Comm: syz-executor201 Not tainted 6.8.0-syzkaller-05242-g32fa4366cc4d #0 [ 72.340597][ T5070] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 [ 72.350644][ T5070] Call Trace: [ 72.353918][ T5070] [ 72.356845][ T5070] dump_stack_lvl+0x1e7/0x2e0 [ 72.361535][ T5070] ? __pfx_dump_stack_lvl+0x10/0x10 [ 72.366731][ T5070] ? print_deadlock_bug+0x479/0x620 [ 72.371939][ T5070] ? _find_first_zero_bit+0xd4/0x100 [ 72.377310][ T5070] validate_chain+0x15c1/0x58e0 [ 72.382166][ T5070] ? __pfx_validate_chain+0x10/0x10 [ 72.387362][ T5070] ? stack_depot_save_flags+0x37d/0x860 [ 72.392906][ T5070] ? do_raw_spin_lock+0x14f/0x370 [ 72.397936][ T5070] ? __pfx_lock_release+0x10/0x10 [ 72.402956][ T5070] ? mark_lock+0x9a/0x350 [ 72.407283][ T5070] ? mark_lock+0x9a/0x350 [ 72.411607][ T5070] ? __lock_acquire+0x1346/0x1fd0 [ 72.416630][ T5070] ? __pfx_validate_chain+0x10/0x10 [ 72.421828][ T5070] ? mark_lock+0x9a/0x350 [ 72.426163][ T5070] __lock_acquire+0x1346/0x1fd0 [ 72.431014][ T5070] lock_acquire+0x1e4/0x530 [ 72.435510][ T5070] ? trie_delete_elem+0x96/0x6a0 [ 72.440456][ T5070] ? __pfx_lock_acquire+0x10/0x10 [ 72.445474][ T5070] ? __lock_acquire+0x1346/0x1fd0 [ 72.450504][ T5070] _raw_spin_lock_irqsave+0xd5/0x120 [ 72.455784][ T5070] ? trie_delete_elem+0x96/0x6a0 [ 72.460717][ T5070] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 72.466610][ T5070] ? __pfx_lock_acquire+0x10/0x10 [ 72.471630][ T5070] trie_delete_elem+0x96/0x6a0 [ 72.476391][ T5070] ? __pfx___cant_migrate+0x10/0x10 [ 72.481585][ T5070] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 72.487038][ T5070] ? bpf_trace_run4+0x16e/0x490 [ 72.491900][ T5070] bpf_trace_run4+0x25a/0x490 [ 72.496588][ T5070] ? __pfx_bpf_trace_run4+0x10/0x10 [ 72.501783][ T5070] ? prepare_alloc_pages+0x1da/0x5b0 [ 72.507086][ T5070] __alloc_pages+0x657/0x680 [ 72.511678][ T5070] ? __pfx___alloc_pages+0x10/0x10 [ 72.516794][ T5070] ? do_raw_spin_lock+0x14f/0x370 [ 72.521816][ T5070] ? __lock_acquire+0x1346/0x1fd0 [ 72.526860][ T5070] __kmalloc_large_node+0x91/0x1f0 [ 72.531972][ T5070] __kmalloc_node+0x33c/0x4e0 [ 72.536649][ T5070] ? bpf_map_kmalloc_node+0xd3/0x1c0 [ 72.541927][ T5070] ? bpf_map_get_memcg+0x9a/0x4d0 [ 72.546946][ T5070] bpf_map_kmalloc_node+0xd3/0x1c0 [ 72.552060][ T5070] trie_update_elem+0x1d3/0xc10 [ 72.556920][ T5070] bpf_map_update_value+0x4d3/0x540 [ 72.562136][ T5070] map_update_elem+0x53a/0x6f0 [ 72.566898][ T5070] __sys_bpf+0x76f/0x810 [ 72.571137][ T5070] ? __pfx___sys_bpf+0x10/0x10 [ 72.575900][ T5070] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 72.582220][ T5070] ? do_syscall_64+0x10a/0x240 [ 72.586980][ T5070] __x64_sys_bpf+0x7c/0x90 [ 72.591387][ T5070] do_syscall_64+0xfb/0x240 [ 72.595885][ T5070] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 72.601775][ T5070] RIP: 0033:0x7f0d70e837a9 [ 72.606209][ T5070] Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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 [ 72.625978][ T5070] RSP: 002b:00007fff03b606c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 bpf(BPF_MAP_UPDATE_ELEM, {map_fd=6, key=0x200008c0, value=0x20000900, flags=BPF_ANY}, 32) = 0 exit_group(0) = ? +++ exited with 0 +++ [ 72.634403][ T5070] RAX: ffff