./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor408982746 <...> Warning: Permanently added '10.128.1.75' (ED25519) to the list of known hosts. execve("./syz-executor408982746", ["./syz-executor408982746"], 0x7ffd6d372c30 /* 10 vars */) = 0 brk(NULL) = 0x55558e7cf000 brk(0x55558e7cfd00) = 0x55558e7cfd00 arch_prctl(ARCH_SET_FS, 0x55558e7cf380) = 0 set_tid_address(0x55558e7cf650) = 5082 set_robust_list(0x55558e7cf660, 24) = 0 rseq(0x55558e7cfca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor408982746", 4096) = 27 getrandom("\xe8\x8d\x29\xe2\x52\x0e\x18\x98", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558e7cfd00 brk(0x55558e7f0d00) = 0x55558e7f0d00 brk(0x55558e7f1000) = 0x55558e7f1000 mprotect(0x7f7246c3a000, 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_SOCKMAP, key_size=4, value_size=8, max_entries=11, map_flags=0, 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) = 3 bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_RAW_TRACEPOINT, insn_cnt=13, insns=0x20000180, license="syzkaller", 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="kfree", prog_fd=4}}, 16) = 5 socketpair(AF_UNIX, SOCK_STREAM, 0, [6, 7]) = 0 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_SOCKMAP, key_size=4, value_size=4, max_entries=18, map_flags=0, 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) = 8 bpf(BPF_MAP_UPDATE_ELEM, {map_fd=8, key=0x200006c0, value=0x20000700, flags=BPF_ANY}, 32) = 0 [ 57.337065][ T5082] [ 57.339459][ T5082] ============================================ [ 57.345591][ T5082] WARNING: possible recursive locking detected [ 57.351806][ T5082] 6.9.0-rc5-syzkaller-01536-gba39486d2c43 #0 Not tainted [ 57.358840][ T5082] -------------------------------------------- [ 57.364977][ T5082] syz-executor408/5082 is trying to acquire lock: [ 57.371385][ T5082] ffff8880221bda20 (&stab->lock){+...}-{2:2}, at: sock_map_delete_elem+0x175/0x250 [ 57.380691][ T5082] [ 57.380691][ T5082] but task is already holding lock: [ 57.388045][ T5082] ffff8880221bf220 (&stab->lock){+...}-{2:2}, at: sock_map_update_common+0x1b6/0x5b0 [ 57.397594][ T5082] [ 57.397594][ T5082] other info that might help us debug this: [ 57.405633][ T5082] Possible unsafe locking scenario: [ 57.405633][ T5082] [ 57.413073][ T5082] CPU0 [ 57.416340][ T5082] ---- [ 57.419604][ T5082] lock(&stab->lock); [ 57.423665][ T5082] lock(&stab->lock); [ 57.427895][ T5082] [ 57.427895][ T5082] *** DEADLOCK *** [ 57.427895][ T5082] [ 57.436284][ T5082] May be due to missing lock nesting notation [ 57.436284][ T5082] [ 57.444579][ T5082] 5 locks held by syz-executor408/5082: [ 57.450116][ T5082] #0: ffff888079889a58 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sock_map_update_elem_sys+0x1cc/0x910 [ 57.460551][ T5082] #1: ffffffff8e334e20 (rcu_read_lock){....}-{1:2}, at: sock_map_update_elem_sys+0x1d8/0x910 [ 57.470886][ T5082] #2: ffff8880221bf220 (&stab->lock){+...}-{2:2}, at: sock_map_update_common+0x1b6/0x5b0 [ 57.480778][ T5082] #3: ffff88807ce142b0 (&psock->link_lock){+...}-{2:2}, at: sock_map_unref+0xcc/0x5e0 [ 57.490426][ T5082] #4: ffffffff8e334e20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 57.499813][ T5082] [ 57.499813][ T5082] stack backtrace: [ 57.505688][ T5082] CPU: 0 PID: 5082 Comm: syz-executor408 Not tainted 6.9.0-rc5-syzkaller-01536-gba39486d2c43 #0 [ 57.516277][ T5082] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 [ 57.526489][ T5082] Call Trace: [ 57.529755][ T5082] [ 57.532668][ T5082] dump_stack_lvl+0x241/0x360 [ 57.537341][ T5082] ? __pfx_dump_stack_lvl+0x10/0x10 [ 57.542716][ T5082] ? print_deadlock_bug+0x479/0x620 [ 57.547896][ T5082] ? _find_first_zero_bit+0xd4/0x100 [ 57.553164][ T5082] validate_chain+0x15c1/0x58e0 [ 57.558012][ T5082] ? __pfx_validate_chain+0x10/0x10 [ 57.563191][ T5082] ? __pfx_lock_acquire+0x10/0x10 [ 57.568192][ T5082] ? __pfx_validate_chain+0x10/0x10 [ 57.573374][ T5082] ? validate_chain+0x11b/0x58e0 [ 57.578292][ T5082] ? __pfx_validate_chain+0x10/0x10 [ 57.583475][ T5082] ? __pfx_validate_chain+0x10/0x10 [ 57.588650][ T5082] ? validate_chain+0x11b/0x58e0 [ 57.593585][ T5082] ? mark_lock+0x9a/0x350 [ 57.597907][ T5082] ? __lock_acquire+0x1346/0x1fd0 [ 57.602931][ T5082] ? mark_lock+0x9a/0x350 [ 57.607272][ T5082] __lock_acquire+0x1346/0x1fd0 [ 57.612132][ T5082] lock_acquire+0x1ed/0x550 [ 57.616654][ T5082] ? sock_map_delete_elem+0x175/0x250 [ 57.622026][ T5082] ? __pfx_lock_acquire+0x10/0x10 [ 57.627038][ T5082] ? bpf_get_current_cgroup_id+0x1d/0x340 [ 57.632743][ T5082] ? sock_map_delete_elem+0x175/0x250 [ 57.638131][ T5082] ? __pfx___local_bh_disable_ip+0x10/0x10 [ 57.643926][ T5082] ? __pfx_lock_acquire+0x10/0x10 [ 57.648936][ T5082] ? bpf_get_current_cgroup_id+0x1d/0x340 [ 57.654818][ T5082] ? sock_map_delete_elem+0x175/0x250 [ 57.660181][ T5082] _raw_spin_lock_bh+0x35/0x50 [ 57.664967][ T5082] ? sock_map_delete_elem+0x175/0x250 [ 57.670326][ T5082] sock_map_delete_elem+0x175/0x250 [ 57.675518][ T5082] ? __pfx_rcu_read_lock_sched_held+0x10/0x10 [ 57.682023][ T5082] ? __pfx_sock_map_delete_elem+0x10/0x10 [ 57.687750][ T5082] ? bpf_get_current_cgroup_id+0x1d/0x340 [ 57.693465][ T5082] ? bpf_trace_run2+0x1fc/0x540 [ 57.698305][ T5082] bpf_prog_d284ea97e99fac5b+0x47/0x4b [ 57.703751][ T5082] bpf_trace_run2+0x2ec/0x540 [ 57.708507][ T5082] ? __pfx_bpf_trace_run2+0x10/0x10 [ 57.713697][ T5082] ? do_raw_spin_lock+0x14f/0x370 [ 57.718722][ T5082] ? __pfx___local_bh_disable_ip+0x10/0x10 [ 57.724686][ T5082] ? sock_map_unref+0x3ac/0x5e0 [ 57.729528][ T5082] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 57.734892][ T5082] ? sock_map_unref+0x3ac/0x5e0 [ 57.739738][ T5082] kfree+0x2af/0x3a0 [ 57.743627][ T5082] sock_map_unref+0x3ac/0x5e0 [ 57.748341][ T5082] sock_map_update_common+0x4f0/0x5b0 [ 57.753718][ T5082] sock_map_update_elem_sys+0x55f/0x910 [ 57.759263][ T5082] ? __virt_addr_valid+0x183/0x520 [ 57.764371][ T5082] ? sock_map_update_elem_sys+0x1d8/0x910 [ 57.770075][ T5082] ? __pfx_sock_map_update_elem_sys+0x10/0x10 [ 57.776134][ T5082] map_update_elem+0x53a/0x6f0 [ 57.780889][ T5082] __sys_bpf+0x76f/0x810 [ 57.785123][ T5082] ? __pfx___sys_bpf+0x10/0x10 [ 57.789882][ T5082] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 57.796201][ T5082] ? do_syscall_64+0x102/0x240 [ 57.801305][ T5082] __x64_sys_bpf+0x7c/0x90 [ 57.805715][ T5082] do_syscall_64+0xf5/0x240 [ 57.810205][ T5082] ? clear_bhb_loop+0x35/0x90 [ 57.814872][ T5082] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 57.820756][ T5082] RIP: 0033:0x7f7246bc7729 [ 57.825158][ T5082] 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 [ 57.844756][ T5082] RSP: 002b:00007ffceebff9b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 57.853156][ T5082] RAX: ffffffffffffffda RBX: 00007ffceebffb88 RCX: 00007f7246bc7729 [ 57.861116][ T5082] RDX: 0000000000000020 RSI: 0000000020000680 RDI: 0000000000000002 [ 57.869074][ T5082] RBP: 00007f7246c3a610 R08: 00007ffceebffb88 R09: 00007ffceebffb88 [ 57.877039][ T5082] R10: 00007ffceebffb88 R11: 0000000000000246 R12: 0000000000000001 bpf(BPF_MAP_UPDATE_ELEM, {map_fd=8, key=0x20000600, value=0x20000640, flags=BPF_ANY}, 32) = 0 exit_group(0) = ? +++ exited with 0 +++ [ 57.884996][ T5082] R13: 00007ffceebffb78 R14: 00