./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor378154555 <...> Warning: Permanently added '10.128.0.60' (ED25519) to the list of known hosts. execve("./syz-executor378154555", ["./syz-executor378154555"], 0x7ffc28bf5780 /* 10 vars */) = 0 brk(NULL) = 0x55557b33c000 brk(0x55557b33cd00) = 0x55557b33cd00 arch_prctl(ARCH_SET_FS, 0x55557b33c380) = 0 set_tid_address(0x55557b33c650) = 5080 set_robust_list(0x55557b33c660, 24) = 0 rseq(0x55557b33cca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor378154555", 4096) = 27 getrandom("\xd4\x35\x23\x7b\x20\xa3\x74\xa5", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55557b33cd00 brk(0x55557b35dd00) = 0x55557b35dd00 brk(0x55557b35e000) = 0x55557b35e000 mprotect(0x7f15c564c000, 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 [ 73.046355][ T5080] [ 73.048720][ T5080] ============================================ [ 73.054876][ T5080] WARNING: possible recursive locking detected [ 73.061025][ T5080] 6.8.0-syzkaller-05227-gf6e922365faf #0 Not tainted [ 73.067704][ T5080] -------------------------------------------- [ 73.073837][ T5080] syz-executor378/5080 is trying to acquire lock: [ 73.080243][ T5080] ffff88802e2411f8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 73.089181][ T5080] [ 73.089181][ T5080] but task is already holding lock: [ 73.096531][ T5080] ffff88802e2409f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcb/0xc10 [ 73.105395][ T5080] [ 73.105395][ T5080] other info that might help us debug this: [ 73.113439][ T5080] Possible unsafe locking scenario: [ 73.113439][ T5080] [ 73.120890][ T5080] CPU0 [ 73.124199][ T5080] ---- [ 73.127490][ T5080] lock(&trie->lock); [ 73.131558][ T5080] lock(&trie->lock); [ 73.135620][ T5080] [ 73.135620][ T5080] *** DEADLOCK *** [ 73.135620][ T5080] [ 73.143755][ T5080] May be due to missing lock nesting notation [ 73.143755][ T5080] [ 73.152060][ T5080] 3 locks held by syz-executor378/5080: [ 73.157798][ T5080] #0: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_map_update_value+0x3c4/0x540 [ 73.167773][ T5080] #1: ffff88802e2409f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcb/0xc10 [ 73.177126][ T5080] #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16e/0x490 [ 73.186538][ T5080] [ 73.186538][ T5080] stack backtrace: [ 73.192417][ T5080] CPU: 1 PID: 5080 Comm: syz-executor378 Not tainted 6.8.0-syzkaller-05227-gf6e922365faf #0 [ 73.202470][ T5080] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 [ 73.212520][ T5080] Call Trace: [ 73.215814][ T5080] [ 73.218739][ T5080] dump_stack_lvl+0x1e7/0x2e0 [ 73.223437][ T5080] ? __pfx_dump_stack_lvl+0x10/0x10 [ 73.228644][ T5080] ? print_deadlock_bug+0x479/0x620 [ 73.233849][ T5080] ? _find_first_zero_bit+0xd4/0x100 [ 73.239169][ T5080] validate_chain+0x15c1/0x58e0 [ 73.244037][ T5080] ? __pfx_validate_chain+0x10/0x10 [ 73.249319][ T5080] ? stack_depot_save_flags+0x37d/0x860 [ 73.254862][ T5080] ? do_raw_spin_lock+0x14f/0x370 [ 73.259920][ T5080] ? __pfx_lock_release+0x10/0x10 [ 73.264943][ T5080] ? mark_lock+0x9a/0x350 [ 73.269278][ T5080] ? mark_lock+0x9a/0x350 [ 73.273602][ T5080] ? __lock_acquire+0x1346/0x1fd0 [ 73.278615][ T5080] ? __pfx_validate_chain+0x10/0x10 [ 73.283810][ T5080] ? mark_lock+0x9a/0x350 [ 73.288133][ T5080] __lock_acquire+0x1346/0x1fd0 [ 73.292987][ T5080] lock_acquire+0x1e4/0x530 [ 73.297480][ T5080] ? trie_delete_elem+0x96/0x6a0 [ 73.302415][ T5080] ? __pfx_lock_acquire+0x10/0x10 [ 73.307442][ T5080] ? __lock_acquire+0x1346/0x1fd0 [ 73.312466][ T5080] _raw_spin_lock_irqsave+0xd5/0x120 [ 73.317746][ T5080] ? trie_delete_elem+0x96/0x6a0 [ 73.322684][ T5080] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 73.328570][ T5080] ? __pfx_lock_acquire+0x10/0x10 [ 73.333606][ T5080] trie_delete_elem+0x96/0x6a0 [ 73.338366][ T5080] ? __pfx___cant_migrate+0x10/0x10 [ 73.343566][ T5080] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 73.349016][ T5080] ? bpf_trace_run4+0x16e/0x490 [ 73.353862][ T5080] bpf_trace_run4+0x25a/0x490 [ 73.358541][ T5080] ? __pfx_bpf_trace_run4+0x10/0x10 [ 73.363735][ T5080] ? prepare_alloc_pages+0x1da/0x5b0 [ 73.369040][ T5080] __alloc_pages+0x657/0x680 [ 73.373659][ T5080] ? __pfx___alloc_pages+0x10/0x10 [ 73.378775][ T5080] ? do_raw_spin_lock+0x14f/0x370 [ 73.383816][ T5080] ? __lock_acquire+0x1346/0x1fd0 [ 73.388836][ T5080] __kmalloc_large_node+0x91/0x1f0 [ 73.393946][ T5080] __kmalloc_node+0x33c/0x4e0 [ 73.398644][ T5080] ? bpf_map_kmalloc_node+0xd3/0x1c0 [ 73.403929][ T5080] ? bpf_map_get_memcg+0x9a/0x4d0 [ 73.408954][ T5080] bpf_map_kmalloc_node+0xd3/0x1c0 [ 73.414067][ T5080] trie_update_elem+0x1d3/0xc10 [ 73.418949][ T5080] bpf_map_update_value+0x4d3/0x540 [ 73.424163][ T5080] map_update_elem+0x53a/0x6f0 [ 73.428922][ T5080] __sys_bpf+0x76f/0x810 [ 73.433161][ T5080] ? __pfx___sys_bpf+0x10/0x10 [ 73.437945][ T5080] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 73.444269][ T5080] ? do_syscall_64+0x10a/0x240 [ 73.449029][ T5080] __x64_sys_bpf+0x7c/0x90 [ 73.453443][ T5080] do_syscall_64+0xfb/0x240 [ 73.457946][ T5080] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 73.463850][ T5080] RIP: 0033:0x7f15c55d97a9 [ 73.468258][ T5080] 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 [ 73.487855][ T5080] RSP: 002b:00007fff37a6ea68 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 +++ [ 73.496262][ T5080] RAX: