./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1278061693 <...> DUID 00:04:6c:04:c3:62:3a:5f:92:72:88:9d:7b:03:53:24:94:74 forked to background, child pid 4735 [ 35.717632][ T4736] 8021q: adding VLAN 0 to HW filter on device bond0 [ 35.731427][ T4736] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.161' (ED25519) to the list of known hosts. execve("./syz-executor1278061693", ["./syz-executor1278061693"], 0x7fff0f51ba70 /* 10 vars */) = 0 brk(NULL) = 0x5555903bb000 brk(0x5555903bbd00) = 0x5555903bbd00 arch_prctl(ARCH_SET_FS, 0x5555903bb380) = 0 set_tid_address(0x5555903bb650) = 5066 set_robust_list(0x5555903bb660, 24) = 0 rseq(0x5555903bbca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1278061693", 4096) = 28 getrandom("\x38\x1b\x16\x3f\x6d\x48\x14\xd7", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555903bbd00 brk(0x5555903dcd00) = 0x5555903dcd00 brk(0x5555903dd000) = 0x5555903dd000 mprotect(0x7f6832138000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5067 attached , child_tidptr=0x5555903bb650) = 5067 [pid 5067] set_robust_list(0x5555903bb660, 24) = 0 [pid 5067] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5067] setpgid(0, 0) = 0 [pid 5067] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5067] write(3, "1000", 4) = 4 [pid 5067] close(3) = 0 [pid 5067] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=8, 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) = 3 [pid 5067] bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_RAW_TRACEPOINT, insn_cnt=12, insns=0x20000740, 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 [pid 5067] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=4}}, 16) = 5 syzkaller login: [ 58.389937][ T5061] [ 58.392317][ T5061] ====================================================== [ 58.399411][ T5061] WARNING: possible circular locking dependency detected [ 58.407047][ T5061] 6.8.0-syzkaller-05243-g14bb1e8c8d4a #0 Not tainted [ 58.413887][ T5061] ------------------------------------------------------ [ 58.421411][ T5061] sshd/5061 is trying to acquire lock: [ 58.427031][ T5061] ffff8880b9529470 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 58.435855][ T5061] [ 58.435855][ T5061] but task is already holding lock: [ 58.443386][ T5061] ffff88802f1521f8 (&trie->lock){..-.}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 58.452288][ T5061] [ 58.452288][ T5061] which lock already depends on the new lock. [ 58.452288][ T5061] [ 58.463206][ T5061] [ 58.463206][ T5061] the existing dependency chain (in reverse order) is: [ 58.472385][ T5061] [ 58.472385][ T5061] -> #2 (&trie->lock){..-.}-{2:2}: [ 58.479918][ T5061] lock_acquire+0x1e4/0x530 [ 58.485113][ T5061] _raw_spin_lock_irqsave+0xd5/0x120 [ 58.490946][ T5061] trie_delete_elem+0x96/0x6a0 [ 58.496308][ T5061] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 58.502373][ T5061] bpf_trace_run2+0x2ec/0x530 [ 58.507577][ T5061] enqueue_timer+0x396/0x550 [ 58.512702][ T5061] __mod_timer+0xa0e/0xeb0 [ 58.517644][ T5061] dsp_cmx_send+0x21bf/0x2240 [ 58.522869][ T5061] call_timer_fn+0x17e/0x600 [ 58.528001][ T5061] __run_timer_base+0x66a/0x8e0 [ 58.533455][ T5061] run_timer_softirq+0xb7/0x170 [ 58.538992][ T5061] __do_softirq+0x2bc/0x943 [ 58.544181][ T5061] __irq_exit_rcu+0xf2/0x1c0 [ 58.549279][ T5061] irq_exit_rcu+0x9/0x30 [ 58.554289][ T5061] sysvec_apic_timer_interrupt+0xa6/0xc0 [ 58.560442][ T5061] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 58.567297][ T5061] acpi_safe_halt+0x21/0x30 [ 58.572842][ T5061] acpi_idle_enter+0xe4/0x140 [ 58.578386][ T5061] cpuidle_enter_state+0x118/0x490 [ 58.584977][ T5061] cpuidle_enter+0x5d/0xa0 [ 58.590097][ T5061] do_idle+0x375/0x5d0 [ 58.594784][ T5061] cpu_startup_entry+0x42/0x60 [ 58.600154][ T5061] rest_init+0x2e0/0x300 [ 58.604998][ T5061] arch_call_rest_init+0xe/0x10 [ 58.610537][ T5061] start_kernel+0x47a/0x500 [ 58.615639][ T5061] x86_64_start_reservations+0x2a/0x30 [ 58.621609][ T5061] x86_64_start_kernel+0x99/0xa0 [ 58.627618][ T5061] common_startup_64+0x13e/0x147 [ 58.633180][ T5061] [ 58.633180][ T5061] -> #1 (&base->lock){-.-.}-{2:2}: [ 58.640562][ T5061] lock_acquire+0x1e4/0x530 [ 58.646012][ T5061] _raw_spin_lock_irqsave+0xd5/0x120 [ 58.651895][ T5061] lock_timer_base+0x112/0x240 [ 58.658214][ T5061] __mod_timer+0x1ca/0xeb0 [ 58.663247][ T5061] queue_delayed_work_on+0x15a/0x260 [ 58.669046][ T5061] kvfree_call_rcu+0x47f/0x790 [ 58.674504][ T5061] rtnl_register_internal+0x482/0x590 [ 58.680559][ T5061] rtnl_register+0x36/0x80 [ 58.685755][ T5061] ip_rt_init+0x2f5/0x3a0 [ 58.690704][ T5061] ip_init+0xe/0x20 [ 58.695120][ T5061] inet_init+0x3d8/0x580 [ 58.699889][ T5061] do_one_initcall+0x238/0x830 [ 58.705818][ T5061] do_initcall_level+0x157/0x210 [ 58.711542][ T5061] do_initcalls+0x3f/0x80 [ 58.716379][ T5061] kernel_init_freeable+0x435/0x5d0 [ 58.722174][ T5061] kernel_init+0x1d/0x2a0 [ 58.727102][ T5061] ret_from_fork+0x4b/0x80 [ 58.732035][ T5061] ret_from_fork_asm+0x1a/0x30 [ 58.737569][ T5061] [ 58.737569][ T5061] -> #0 (krc.lock){....}-{2:2}: [ 58.744773][ T5061] validate_chain+0x18cb/0x58e0 [ 58.750222][ T5061] __lock_acquire+0x1346/0x1fd0 [ 58.755590][ T5061] lock_acquire+0x1e4/0x530 [ 58.760623][ T5061] _raw_spin_lock+0x2e/0x40 [ 58.765917][ T5061] kvfree_call_rcu+0x18a/0x790 [ 58.771300][ T5061] trie_delete_elem+0x52c/0x6a0 [ 58.776671][ T5061] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 58.782821][ T5061] bpf_trace_run2+0x2ec/0x530 [ 58.788009][ T5061] enqueue_timer+0x396/0x550 [ 58.793371][ T5061] __mod_timer+0x953/0xeb0 [ 58.798326][ T5061] sk_reset_timer+0x23/0xc0 [ 58.803352][ T5061] tcp_event_new_data_sent+0x203/0x360 [ 58.810017][ T5061] tcp_write_xmit+0x1468/0x6100 [ 58.815471][ T5061] __tcp_push_pending_frames+0x9b/0x360 [ 58.821563][ T5061] tcp_sendmsg_locked+0x42cc/0x4d00 [ 58.827362][ T5061] tcp_sendmsg+0x30/0x50 [ 58.832373][ T5061] __sock_sendmsg+0x1a6/0x270 [ 58.837650][ T5061] sock_write_iter+0x2dd/0x400 [ 58.843016][ T5061] vfs_write+0xa84/0xcb0 [ 58.847858][ T5061] ksys_write+0x1a0/0x2c0 [ 58.852713][ T5061] do_syscall_64+0xfb/0x240 [ 58.859142][ T5061] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 58.865898][ T5061] [ 58.865898][ T5061] other info that might help us debug this: [ 58.865898][ T5061] [ 58.876474][ T5061] Chain exists of: [ 58.876474][ T5061] krc.lock --> &base->lock --> &trie->lock [ 58.876474][ T5061] [ 58.889785][ T5061] Possible unsafe locking scenario: [ 58.889785][ T5061] [ 58.897653][ T5061] CPU0 CPU1 [ 58.903695][ T5061] ---- ---- [ 58.909240][ T5061] lock(&trie->lock); [ 58.913299][ T5061] lock(&base->lock); [ 58.920145][ T5061] lock(&trie->lock); [ 58.927069][ T5061] lock(krc.lock); [ 58.931130][ T5061] [ 58.931130][ T5061] *** DEADLOCK *** [ 58.931130][ T5061] [ 58.939527][ T5061] 4 locks held by sshd/5061: [ 58.944187][ T5061] #0: ffff88807a1d0e98 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 58.954028][ T5061] #1: ffff8880b952a758 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 58.963422][ T5061] #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x530 [ 58.973119][ T5061] #3: ffff88802f1521f8 (&trie->lock){..-.}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 58.982857][ T5061] [ 58.982857][ T5061] stack backtrace: [ 58.988737][ T5061] CPU: 1 PID: 5061 Comm: sshd Not tainted 6.8.0-syzkaller-05243-g14bb1e8c8d4a #0 [ 58.998189][ T5061] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 59.008412][ T5061] Call Trace: [ 59.011696][ T5061] [ 59.014613][ T5061] dump_stack_lvl+0x1e7/0x2e0 [ 59.019319][ T5061] ? __pfx_dump_stack_lvl+0x10/0x10 [ 59.024684][ T5061] ? print_circular_bug+0x130/0x1a0 [ 59.030220][ T5061] check_noncircular+0x36a/0x4a0 [ 59.035244][ T5061] ? __pfx_check_noncircular+0x10/0x10 [ 59.040696][ T5061] ? lockdep_lock+0x123/0x2b0 [ 59.045538][ T5061] ? __pfx_validate_chain+0x10/0x10 [ 59.051001][ T5061] ? _find_first_zero_bit+0xd4/0x100 [ 59.056627][ T5061] validate_chain+0x18cb/0x58e0 [ 59.061658][ T5061] ? __pfx_validate_chain+0x10/0x10 [ 59.067197][ T5061] ? __pfx_validate_chain+0x10/0x10 [ 59.072472][ T5061] ? mark_lock+0x9a/0x350 [ 59.076980][ T5061] ? __lock_acquire+0x1346/0x1fd0 [ 59.082118][ T5061] ? mark_lock+0x9a/0x350 [ 59.086718][ T5061] ? mark_lock+0x9a/0x350 [ 59.091050][ T5061] __lock_acquire+0x1346/0x1fd0 [ 59.096068][ T5061] lock_acquire+0x1e4/0x530 [ 59.100559][ T5061] ? kvfree_call_rcu+0x18a/0x790 [ 59.105518][ T5061] ? __pfx_lock_acquire+0x10/0x10 [ 59.110638][ T5061] ? debug_object_active_state+0x239/0x360 [ 59.116533][ T5061] ? __pfx_debug_object_active_state+0x10/0x10 [ 59.122775][ T5061] ? __virt_addr_valid+0x183/0x520 [ 59.127915][ T5061] ? __virt_addr_valid+0x183/0x520 [ 59.133102][ T5061] ? __virt_addr_valid+0x44e/0x520 [ 59.138379][ T5061] ? __phys_addr+0xba/0x170 [ 59.142895][ T5061] _raw_spin_lock+0x2e/0x40 [ 59.147576][ T5061] ? kvfree_call_rcu+0x18a/0x790 [ 59.152502][ T5061] kvfree_call_rcu+0x18a/0x790 [ 59.157255][ T5061] ? _raw_spin_lock_irqsave+0xe1/0x120 [ 59.162700][ T5061] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 59.168060][ T5061] ? longest_prefix_match+0x33d/0x670 [ 59.173425][ T5061] trie_delete_elem+0x52c/0x6a0 [ 59.178528][ T5061] ? bpf_trace_run2+0x1fc/0x530 [ 59.183371][ T5061] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 59.189342][ T5061] bpf_trace_run2+0x2ec/0x530 [ 59.194360][ T5061] ? __pfx_bpf_trace_run2+0x10/0x10 [ 59.199638][ T5061] ? __pfx_debug_object_activate+0x10/0x10 [ 59.205885][ T5061] ? __tcp_transmit_skb+0x21fe/0x3b80 [ 59.211340][ T5061] enqueue_timer+0x396/0x550 [ 59.215932][ T5061] __mod_timer+0x953/0xeb0 [ 59.220448][ T5061] ? __pfx___mod_timer+0x10/0x10 [ 59.225565][ T5061] ? seqcount_lockdep_reader_access+0x157/0x220 [ 59.232232][ T5061] ? lockdep_hardirqs_on+0x99/0x150 [ 59.237601][ T5061] ? __asan_memset+0x23/0x50 [ 59.242657][ T5061] sk_reset_timer+0x23/0xc0 [ 59.247338][ T5061] tcp_event_new_data_sent+0x203/0x360 [ 59.252922][ T5061] tcp_write_xmit+0x1468/0x6100 [ 59.257976][ T5061] __tcp_push_pending_frames+0x9b/0x360 [ 59.263784][ T5061] tcp_sendmsg_locked+0x42cc/0x4d00 [ 59.269076][ T5061] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 59.274703][ T5061] ? __local_bh_enable_ip+0x168/0x200 [ 59.280173][ T5061] ? do_raw_spin_unlock+0x13c/0x8b0 [ 59.285453][ T5061] tcp_sendmsg+0x30/0x50 [ 59.289943][ T5061] __sock_sendmsg+0x1a6/0x270 [ 59.294618][ T5061] sock_write_iter+0x2dd/0x400 [ 59.299497][ T5061] ? __pfx_sock_write_iter+0x10/0x10 [ 59.305158][ T5061] ? bpf_lsm_file_permission+0x9/0x10 [ 59.310540][ T5061] ? security_file_permission+0x7f/0xa0 [ 59.316080][ T5061] vfs_write+0xa84/0xcb0 [ 59.320460][ T5061] ? __pfx_vfs_write+0x10/0x10 [ 59.325334][ T5061] ? __set_current_blocked+0x310/0x380 [ 59.331057][ T5061] ? __might_fault+0xc6/0x120 [ 59.335901][ T5061] ? __fdget_pos+0x1a2/0x320 [ 59.340571][ T5061] ksys_write+0x1a0/0x2c0 [ 59.344890][ T5061] ? __pfx_ksys_write+0x10/0x10 [ 59.350254][ T5061] ? do_syscall_64+0x10a/0x240 [ 59.355020][ T5061] ? do_syscall_64+0xb6/0x240 [ 59.359691][ T5061] do_syscall_64+0xfb/0x240 [ 59.364307][ T5061] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 59.370281][ T5061] RIP: 0033:0x7f206c4ffbf2 [ 59.374862][ T5061] Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83 [ 59.394830][ T5061] RSP: 002b:00007ffdd3386548 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 59.403500][ T5061] RAX: ffffffffffffffda RBX: 000000000000008c RCX: 00007f206c4ffbf2 [ 59.411809][ T5061] RDX: 000000000000008c RSI: 000055a0d82b6960 RDI: 0000000000000004 [ 59.420249][ T5061] RBP: 000055a0d82c4220 R08: 0000000000000000 R09: 0000000000000000 [ 59.428485][ T5061] R10: 0000000000000000 R11: 0000000000000246 R12: 000055a0a5d60aa4 [ 59.436715][ T5061] R13: 000000000000003a R14: 000055a0a5d613e8 R15: 00007ffdd33865b8 [ 59.445761][ T5061]