./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1273715444 <...> Warning: Permanently added '10.128.1.140' (ED25519) to the list of known hosts. execve("./syz-executor1273715444", ["./syz-executor1273715444"], 0x7ffdcd5bf890 /* 10 vars */) = 0 brk(NULL) = 0x555557d8c000 brk(0x555557d8cd00) = 0x555557d8cd00 arch_prctl(ARCH_SET_FS, 0x555557d8c380) = 0 set_tid_address(0x555557d8c650) = 5081 set_robust_list(0x555557d8c660, 24) = 0 rseq(0x555557d8cca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1273715444", 4096) = 28 getrandom("\x9f\xc2\x14\x3f\xdc\xf6\xd9\xa7", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555557d8cd00 brk(0x555557dadd00) = 0x555557dadd00 brk(0x555557dae000) = 0x555557dae000 mprotect(0x7f8db8f00000, 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 5082 attached , child_tidptr=0x555557d8c650) = 5082 [pid 5082] set_robust_list(0x555557d8c660, 24) = 0 [pid 5082] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5082] setpgid(0, 0) = 0 [pid 5082] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "1000", 4) = 4 [pid 5082] close(3) = 0 [pid 5082] 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 5082] 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 5082] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=4}}, 16) = 5 [pid 5082] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000540, value=0x20000580, flags=BPF_ANY}, 32) = 0 [ 58.789723][ T5076] [ 58.792066][ T5076] ====================================================== [ 58.799061][ T5076] WARNING: possible circular locking dependency detected [ 58.806054][ T5076] 6.9.0-rc6-syzkaller-01461-g5829614a7b3b #0 Not tainted [ 58.813045][ T5076] ------------------------------------------------------ [ 58.820034][ T5076] sshd/5076 is trying to acquire lock: [ 58.825469][ T5076] ffff8880b9429430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 58.834078][ T5076] [ 58.834078][ T5076] but task is already holding lock: [ 58.841435][ T5076] ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 58.850303][ T5076] [ 58.850303][ T5076] which lock already depends on the new lock. [ 58.850303][ T5076] [ 58.860688][ T5076] [ 58.860688][ T5076] the existing dependency chain (in reverse order) is: [ 58.869683][ T5076] [ 58.869683][ T5076] -> #1 (&base->lock){-.-.}-{2:2}: [ 58.876965][ T5076] lock_acquire+0x1ed/0x550 [ 58.881977][ T5076] _raw_spin_lock_irqsave+0xd5/0x120 [ 58.887786][ T5076] lock_timer_base+0x112/0x240 [ 58.893056][ T5076] __mod_timer+0x1ca/0xeb0 [ 58.897975][ T5076] queue_delayed_work_on+0x15a/0x260 [ 58.903768][ T5076] kvfree_call_rcu+0x47f/0x790 [ 58.909038][ T5076] rtnl_register_internal+0x482/0x590 [ 58.914926][ T5076] rtnl_register+0x36/0x80 [ 58.919849][ T5076] ip_rt_init+0x2f5/0x3a0 [ 58.924691][ T5076] ip_init+0xe/0x20 [ 58.929007][ T5076] inet_init+0x3d8/0x580 [ 58.933752][ T5076] do_one_initcall+0x248/0x880 [ 58.939027][ T5076] do_initcall_level+0x157/0x210 [ 58.944469][ T5076] do_initcalls+0x3f/0x80 [ 58.949304][ T5076] kernel_init_freeable+0x435/0x5d0 [ 58.955008][ T5076] kernel_init+0x1d/0x2b0 [ 58.959846][ T5076] ret_from_fork+0x4b/0x80 [ 58.964775][ T5076] ret_from_fork_asm+0x1a/0x30 [ 58.970052][ T5076] [ 58.970052][ T5076] -> #0 (krc.lock){....}-{2:2}: [ 58.977080][ T5076] validate_chain+0x18cb/0x58e0 [ 58.982438][ T5076] __lock_acquire+0x1346/0x1fd0 [ 58.987793][ T5076] lock_acquire+0x1ed/0x550 [ 58.992808][ T5076] _raw_spin_lock+0x2e/0x40 [ 58.997824][ T5076] kvfree_call_rcu+0x18a/0x790 [ 59.003096][ T5076] trie_delete_elem+0x546/0x6a0 [ 59.008459][ T5076] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 59.014421][ T5076] bpf_trace_run2+0x2ec/0x540 [ 59.019604][ T5076] enqueue_timer+0x3ce/0x570 [ 59.024715][ T5076] __mod_timer+0x953/0xeb0 [ 59.029654][ T5076] sk_reset_timer+0x23/0xc0 [ 59.034689][ T5076] tcp_event_new_data_sent+0x203/0x360 [ 59.040677][ T5076] tcp_write_xmit+0x18db/0x69d0 [ 59.046052][ T5076] __tcp_push_pending_frames+0x9b/0x360 [ 59.052121][ T5076] tcp_sendmsg_locked+0x4313/0x4d70 [ 59.057831][ T5076] tcp_sendmsg+0x30/0x50 [ 59.062585][ T5076] __sock_sendmsg+0x1a6/0x270 [ 59.067781][ T5076] sock_write_iter+0x2dd/0x400 [ 59.073056][ T5076] vfs_write+0xa84/0xcb0 [ 59.077814][ T5076] ksys_write+0x1a0/0x2c0 [ 59.082652][ T5076] do_syscall_64+0xf5/0x240 [ 59.087693][ T5076] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 59.094127][ T5076] [ 59.094127][ T5076] other info that might help us debug this: [ 59.094127][ T5076] [ 59.104350][ T5076] Possible unsafe locking scenario: [ 59.104350][ T5076] [ 59.111796][ T5076] CPU0 CPU1 [ 59.117153][ T5076] ---- ---- [ 59.122505][ T5076] lock(&base->lock); [ 59.126569][ T5076] lock(krc.lock); [ 59.132886][ T5076] lock(&base->lock); [ 59.139466][ T5076] lock(krc.lock); [ 59.143264][ T5076] [ 59.143264][ T5076] *** DEADLOCK *** [ 59.143264][ T5076] [ 59.151394][ T5076] 3 locks held by sshd/5076: [ 59.155973][ T5076] #0: ffff88802c469ad8 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 59.165105][ T5076] #1: ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 59.174403][ T5076] #2: ffffffff8e334ea0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 59.183798][ T5076] [ 59.183798][ T5076] stack backtrace: [ 59.189674][ T5076] CPU: 0 PID: 5076 Comm: sshd Not tainted 6.9.0-rc6-syzkaller-01461-g5829614a7b3b #0 [ 59.199115][ T5076] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 59.209158][ T5076] Call Trace: [ 59.212428][ T5076] [ 59.215349][ T5076] dump_stack_lvl+0x241/0x360 [ 59.220022][ T5076] ? __pfx_dump_stack_lvl+0x10/0x10 [ 59.225216][ T5076] ? print_circular_bug+0x130/0x1a0 [ 59.230407][ T5076] check_noncircular+0x36a/0x4a0 [ 59.235336][ T5076] ? __pfx_check_noncircular+0x10/0x10 [ 59.240786][ T5076] ? lockdep_lock+0x123/0x2b0 [ 59.245447][ T5076] ? __pfx_validate_chain+0x10/0x10 [ 59.250634][ T5076] ? _find_first_zero_bit+0xd4/0x100 [ 59.255912][ T5076] validate_chain+0x18cb/0x58e0 [ 59.260756][ T5076] ? __pfx_validate_chain+0x10/0x10 [ 59.265944][ T5076] ? __pfx_validate_chain+0x10/0x10 [ 59.271157][ T5076] ? mark_lock+0x9a/0x350 [ 59.275537][ T5076] ? __lock_acquire+0x1346/0x1fd0 [ 59.280563][ T5076] ? mark_lock+0x9a/0x350 [ 59.284887][ T5076] ? mark_lock+0x9a/0x350 [ 59.289211][ T5076] __lock_acquire+0x1346/0x1fd0 [ 59.294064][ T5076] lock_acquire+0x1ed/0x550 [ 59.298564][ T5076] ? kvfree_call_rcu+0x18a/0x790 [ 59.303496][ T5076] ? __pfx_lock_acquire+0x10/0x10 [ 59.308510][ T5076] ? debug_object_active_state+0x239/0x360 [ 59.314318][ T5076] ? __pfx_debug_object_active_state+0x10/0x10 [ 59.320461][ T5076] ? __virt_addr_valid+0x183/0x520 [ 59.325563][ T5076] ? __virt_addr_valid+0x183/0x520 [ 59.330670][ T5076] ? __virt_addr_valid+0x44e/0x520 [ 59.335775][ T5076] ? __phys_addr+0xba/0x170 [ 59.340269][ T5076] _raw_spin_lock+0x2e/0x40 [ 59.344767][ T5076] ? kvfree_call_rcu+0x18a/0x790 [ 59.349693][ T5076] kvfree_call_rcu+0x18a/0x790 [ 59.354445][ T5076] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 59.360327][ T5076] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 59.365598][ T5076] ? longest_prefix_match+0x33d/0x670 [ 59.370969][ T5076] trie_delete_elem+0x546/0x6a0 [ 59.375817][ T5076] ? bpf_trace_run2+0x1fc/0x540 [ 59.380657][ T5076] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 59.386104][ T5076] bpf_trace_run2+0x2ec/0x540 [ 59.390770][ T5076] ? __pfx_bpf_trace_run2+0x10/0x10 [ 59.395954][ T5076] ? __pfx_debug_object_activate+0x10/0x10 [ 59.401749][ T5076] ? __tcp_transmit_skb+0x21fe/0x3b80 [ 59.407113][ T5076] enqueue_timer+0x3ce/0x570 [ 59.411690][ T5076] __mod_timer+0x953/0xeb0 [ 59.416097][ T5076] ? __pfx___mod_timer+0x10/0x10 [ 59.421019][ T5076] ? seqcount_lockdep_reader_access+0x157/0x220 [ 59.427251][ T5076] ? lockdep_hardirqs_on+0x99/0x150 [ 59.432439][ T5076] ? __asan_memset+0x23/0x50 [ 59.437020][ T5076] sk_reset_timer+0x23/0xc0 [ 59.441510][ T5076] tcp_event_new_data_sent+0x203/0x360 [ 59.446959][ T5076] tcp_write_xmit+0x18db/0x69d0 [ 59.451808][ T5076] ? _copy_from_iter+0x26b/0x1960 [ 59.456907][ T5076] ? __pfx_lock_release+0x10/0x10 [ 59.461963][ T5076] ? __alloc_skb+0x2d5/0x440 [ 59.466552][ T5076] ? __virt_addr_valid+0x183/0x520 [ 59.471659][ T5076] __tcp_push_pending_frames+0x9b/0x360 [ 59.477198][ T5076] tcp_sendmsg_locked+0x4313/0x4d70 [ 59.482397][ T5076] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 59.488713][ T5076] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 59.494249][ T5076] ? __local_bh_enable_ip+0x168/0x200 [ 59.499623][ T5076] ? do_raw_spin_unlock+0x13c/0x8b0 [ 59.504823][ T5076] tcp_sendmsg+0x30/0x50 [ 59.509061][ T5076] __sock_sendmsg+0x1a6/0x270 [ 59.513726][ T5076] sock_write_iter+0x2dd/0x400 [ 59.518482][ T5076] ? __pfx_sock_write_iter+0x10/0x10 [ 59.523850][ T5076] ? bpf_lsm_file_permission+0x9/0x10 [ 59.529211][ T5076] ? security_file_permission+0x7f/0xa0 [ 59.534753][ T5076] vfs_write+0xa84/0xcb0 [ 59.538992][ T5076] ? __pfx_vfs_write+0x10/0x10 [ 59.543743][ T5076] ? __set_current_blocked+0x310/0x380 [ 59.549191][ T5076] ? __might_fault+0xc6/0x120 [ 59.553855][ T5076] ? __fdget_pos+0x1a2/0x320 [ 59.558434][ T5076] ksys_write+0x1a0/0x2c0 [ 59.562759][ T5076] ? __pfx_ksys_write+0x10/0x10 [ 59.567599][ T5076] ? do_syscall_64+0x102/0x240 [ 59.572355][ T5076] ? do_syscall_64+0xb6/0x240 [ 59.577025][ T5076] do_syscall_64+0xf5/0x240 [ 59.581516][ T5076] ? clear_bhb_loop+0x35/0x90 [ 59.586183][ T5076] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 59.592062][ T5076] RIP: 0033:0x7f6972716bf2 [ 59.596472][ T5076] 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 [ 59.616061][ T5076] RSP: 002b:00007ffd20f5d668 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 59.624461][ T5076] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007f6972716bf2 [ 59.632418][ T5076] RDX: 000000000000002c RSI: 0000561846685960 RDI: 0000000000000004 [ 59.640373][ T5076] RBP: 0000561846693220 R08: 0000000000000000 R09: 0000000000000000 [ 59.648331][ T5076] R10: 0000000000000000 R11: 0000000000000246 R12: 000056181e0b5aa4 [ 59.656290][ T5076] R13: 000000000000003a R14: 000056181e0b63e8 R15: 00007ffd20f5d6d8 [ 59.664255][ T5076]