./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor248580224 <...> Warning: Permanently added '10.128.0.159' (ED25519) to the list of known hosts. execve("./syz-executor248580224", ["./syz-executor248580224"], 0x7ffe1ef6e550 /* 10 vars */) = 0 brk(NULL) = 0x555592ff2000 brk(0x555592ff2d00) = 0x555592ff2d00 arch_prctl(ARCH_SET_FS, 0x555592ff2380) = 0 set_tid_address(0x555592ff2650) = 5079 set_robust_list(0x555592ff2660, 24) = 0 rseq(0x555592ff2ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor248580224", 4096) = 27 getrandom("\x80\xe5\x62\x36\x9a\xab\xda\x23", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555592ff2d00 brk(0x555593013d00) = 0x555593013d00 brk(0x555593014000) = 0x555593014000 mprotect(0x7f0e65ca1000, 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 [ 71.332769][ T5079] [ 71.335168][ T5079] ============================================ [ 71.341323][ T5079] WARNING: possible recursive locking detected [ 71.347455][ T5079] 6.8.0-syzkaller-05227-gf6e922365faf #0 Not tainted [ 71.354132][ T5079] -------------------------------------------- [ 71.360282][ T5079] syz-executor248/5079 is trying to acquire lock: [ 71.366693][ T5079] ffff888021e129f8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 71.375589][ T5079] [ 71.375589][ T5079] but task is already holding lock: [ 71.382940][ T5079] ffff888021e121f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcb/0xc10 [ 71.391820][ T5079] [ 71.391820][ T5079] other info that might help us debug this: [ 71.399897][ T5079] Possible unsafe locking scenario: [ 71.399897][ T5079] [ 71.407348][ T5079] CPU0 [ 71.410616][ T5079] ---- [ 71.413883][ T5079] lock(&trie->lock); [ 71.417956][ T5079] lock(&trie->lock); [ 71.422016][ T5079] [ 71.422016][ T5079] *** DEADLOCK *** [ 71.422016][ T5079] [ 71.430339][ T5079] May be due to missing lock nesting notation [ 71.430339][ T5079] [ 71.438661][ T5079] 3 locks held by syz-executor248/5079: [ 71.444197][ T5079] #0: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_map_update_value+0x3c4/0x540 [ 71.454123][ T5079] #1: ffff888021e121f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcb/0xc10 [ 71.463453][ T5079] #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16e/0x490 [ 71.472868][ T5079] [ 71.472868][ T5079] stack backtrace: [ 71.478762][ T5079] CPU: 1 PID: 5079 Comm: syz-executor248 Not tainted 6.8.0-syzkaller-05227-gf6e922365faf #0 [ 71.488813][ T5079] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 [ 71.498884][ T5079] Call Trace: [ 71.502168][ T5079] [ 71.505121][ T5079] dump_stack_lvl+0x1e7/0x2e0 [ 71.509845][ T5079] ? __pfx_dump_stack_lvl+0x10/0x10 [ 71.515046][ T5079] ? print_deadlock_bug+0x479/0x620 [ 71.520243][ T5079] ? _find_first_zero_bit+0xd4/0x100 [ 71.525554][ T5079] validate_chain+0x15c1/0x58e0 [ 71.530414][ T5079] ? __pfx_validate_chain+0x10/0x10 [ 71.535611][ T5079] ? stack_depot_save_flags+0x37d/0x860 [ 71.541181][ T5079] ? do_raw_spin_lock+0x14f/0x370 [ 71.546203][ T5079] ? __pfx_lock_release+0x10/0x10 [ 71.551233][ T5079] ? mark_lock+0x9a/0x350 [ 71.555564][ T5079] ? mark_lock+0x9a/0x350 [ 71.559894][ T5079] ? __lock_acquire+0x1346/0x1fd0 [ 71.564913][ T5079] ? __pfx_validate_chain+0x10/0x10 [ 71.570108][ T5079] ? mark_lock+0x9a/0x350 [ 71.574432][ T5079] __lock_acquire+0x1346/0x1fd0 [ 71.579283][ T5079] lock_acquire+0x1e4/0x530 [ 71.583779][ T5079] ? trie_delete_elem+0x96/0x6a0 [ 71.588717][ T5079] ? __pfx_lock_acquire+0x10/0x10 [ 71.593733][ T5079] ? __lock_acquire+0x1346/0x1fd0 [ 71.598757][ T5079] _raw_spin_lock_irqsave+0xd5/0x120 [ 71.604038][ T5079] ? trie_delete_elem+0x96/0x6a0 [ 71.608985][ T5079] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 71.614873][ T5079] ? __pfx_lock_acquire+0x10/0x10 [ 71.619894][ T5079] trie_delete_elem+0x96/0x6a0 [ 71.624668][ T5079] ? __pfx___cant_migrate+0x10/0x10 [ 71.629883][ T5079] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 71.635336][ T5079] ? bpf_trace_run4+0x16e/0x490 [ 71.640197][ T5079] bpf_trace_run4+0x25a/0x490 [ 71.644886][ T5079] ? __pfx_bpf_trace_run4+0x10/0x10 [ 71.650082][ T5079] ? prepare_alloc_pages+0x1da/0x5b0 [ 71.655373][ T5079] __alloc_pages+0x657/0x680 [ 71.659966][ T5079] ? __pfx___alloc_pages+0x10/0x10 [ 71.665079][ T5079] ? do_raw_spin_lock+0x14f/0x370 [ 71.670101][ T5079] ? __lock_acquire+0x1346/0x1fd0 [ 71.675121][ T5079] __kmalloc_large_node+0x91/0x1f0 [ 71.680235][ T5079] __kmalloc_node+0x33c/0x4e0 [ 71.684911][ T5079] ? bpf_map_kmalloc_node+0xd3/0x1c0 [ 71.690192][ T5079] ? bpf_map_get_memcg+0x9a/0x4d0 [ 71.695217][ T5079] bpf_map_kmalloc_node+0xd3/0x1c0 [ 71.700330][ T5079] trie_update_elem+0x1d3/0xc10 [ 71.705186][ T5079] bpf_map_update_value+0x4d3/0x540 [ 71.710389][ T5079] map_update_elem+0x53a/0x6f0 [ 71.715151][ T5079] __sys_bpf+0x76f/0x810 [ 71.719405][ T5079] ? __pfx___sys_bpf+0x10/0x10 [ 71.724172][ T5079] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 71.730492][ T5079] ? do_syscall_64+0x10a/0x240 [ 71.735262][ T5079] __x64_sys_bpf+0x7c/0x90 [ 71.739672][ T5079] do_syscall_64+0xfb/0x240 [ 71.744176][ T5079] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 71.750083][ T5079] RIP: 0033:0x7f0e65c2e7a9 [ 71.754490][ T5079] 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 [ 71.774088][ T5079] RSP: 002b:00007ffe9caccdf8 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 +++ [ 71.782508][ T5079] RAX