./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor793960283 <...> Warning: Permanently added '10.128.0.39' (ED25519) to the list of known hosts. execve("./syz-executor793960283", ["./syz-executor793960283"], 0x7ffea3a1f5b0 /* 10 vars */) = 0 brk(NULL) = 0x55557ff07000 brk(0x55557ff07d00) = 0x55557ff07d00 arch_prctl(ARCH_SET_FS, 0x55557ff07380) = 0 set_tid_address(0x55557ff07650) = 5070 set_robust_list(0x55557ff07660, 24) = 0 rseq(0x55557ff07ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor793960283", 4096) = 27 getrandom("\xb4\x26\xb6\x04\xc8\x21\xc3\xf9", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55557ff07d00 brk(0x55557ff28d00) = 0x55557ff28d00 brk(0x55557ff29000) = 0x55557ff29000 mprotect(0x7f923e98d000, 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 5071 attached , child_tidptr=0x55557ff07650) = 5071 [pid 5071] set_robust_list(0x55557ff07660, 24) = 0 [pid 5071] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5071] setpgid(0, 0) = 0 [pid 5071] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5071] write(3, "1000", 4) = 4 [pid 5071] close(3) = 0 [pid 5071] 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 5071] 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 5071] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=4}}, 16) = 5 [pid 5071] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000540, value=0x20000580, flags=BPF_ANY}, 32) = 0 [ 74.634205][ T5065] [ 74.636589][ T5065] ====================================================== [ 74.643695][ T5065] WARNING: possible circular locking dependency detected [ 74.650719][ T5065] 6.8.0-syzkaller-05236-g443574b03387 #0 Not tainted [ 74.657472][ T5065] ------------------------------------------------------ [ 74.664484][ T5065] sshd/5065 is trying to acquire lock: [ 74.669939][ T5065] ffff8880b9529470 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 74.678583][ T5065] [ 74.678583][ T5065] but task is already holding lock: [ 74.685944][ T5065] ffff88802e3dd1f8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 74.694926][ T5065] [ 74.694926][ T5065] which lock already depends on the new lock. [ 74.694926][ T5065] [ 74.705325][ T5065] [ 74.705325][ T5065] the existing dependency chain (in reverse order) is: [ 74.714335][ T5065] [ 74.714335][ T5065] -> #2 (&trie->lock){....}-{2:2}: [ 74.721637][ T5065] lock_acquire+0x1e4/0x530 [ 74.726663][ T5065] _raw_spin_lock_irqsave+0xd5/0x120 [ 74.732546][ T5065] trie_delete_elem+0x96/0x6a0 [ 74.737893][ T5065] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 74.743897][ T5065] bpf_trace_run2+0x204/0x420 [ 74.749194][ T5065] enqueue_timer+0x396/0x550 [ 74.754306][ T5065] __mod_timer+0xa0e/0xeb0 [ 74.759250][ T5065] sk_reset_timer+0x23/0xc0 [ 74.764285][ T5065] tcp_schedule_loss_probe+0x419/0x560 [ 74.770275][ T5065] tcp_write_xmit+0x3682/0x6100 [ 74.775655][ T5065] __tcp_push_pending_frames+0x9b/0x360 [ 74.781728][ T5065] tcp_sendmsg_locked+0x42cc/0x4d00 [ 74.787447][ T5065] tcp_sendmsg+0x30/0x50 [ 74.792212][ T5065] __sock_sendmsg+0x1a6/0x270 [ 74.797513][ T5065] sock_write_iter+0x2dd/0x400 [ 74.802837][ T5065] vfs_write+0xa84/0xcb0 [ 74.807612][ T5065] ksys_write+0x1a0/0x2c0 [ 74.812464][ T5065] do_syscall_64+0xfb/0x240 [ 74.817509][ T5065] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 74.823934][ T5065] [ 74.823934][ T5065] -> #1 (&base->lock){-.-.}-{2:2}: [ 74.831242][ T5065] lock_acquire+0x1e4/0x530 [ 74.836265][ T5065] _raw_spin_lock_irqsave+0xd5/0x120 [ 74.842172][ T5065] lock_timer_base+0x112/0x240 [ 74.847465][ T5065] __mod_timer+0x1ca/0xeb0 [ 74.852408][ T5065] queue_delayed_work_on+0x15a/0x260 [ 74.858222][ T5065] kvfree_call_rcu+0x47f/0x790 [ 74.863512][ T5065] rtnl_register_internal+0x482/0x590 [ 74.869407][ T5065] rtnl_register+0x36/0x80 [ 74.874347][ T5065] ip_rt_init+0x2f5/0x3a0 [ 74.879199][ T5065] ip_init+0xe/0x20 [ 74.883556][ T5065] inet_init+0x3d8/0x580 [ 74.888323][ T5065] do_one_initcall+0x238/0x830 [ 74.893627][ T5065] do_initcall_level+0x157/0x210 [ 74.899088][ T5065] do_initcalls+0x3f/0x80 [ 74.903941][ T5065] kernel_init_freeable+0x435/0x5d0 [ 74.909663][ T5065] kernel_init+0x1d/0x2a0 [ 74.914539][ T5065] ret_from_fork+0x4b/0x80 [ 74.919487][ T5065] ret_from_fork_asm+0x1a/0x30 [ 74.924782][ T5065] [ 74.924782][ T5065] -> #0 (krc.lock){....}-{2:2}: [ 74.931913][ T5065] validate_chain+0x18cb/0x58e0 [ 74.937289][ T5065] __lock_acquire+0x1346/0x1fd0 [ 74.942660][ T5065] lock_acquire+0x1e4/0x530 [ 74.947717][ T5065] _raw_spin_lock+0x2e/0x40 [ 74.952745][ T5065] kvfree_call_rcu+0x18a/0x790 [ 74.958122][ T5065] trie_delete_elem+0x52c/0x6a0 [ 74.963501][ T5065] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 74.969480][ T5065] bpf_trace_run2+0x204/0x420 [ 74.974780][ T5065] enqueue_timer+0x396/0x550 [ 74.979898][ T5065] __mod_timer+0x953/0xeb0 [ 74.984859][ T5065] sk_reset_timer+0x23/0xc0 [ 74.989886][ T5065] tcp_event_new_data_sent+0x203/0x360 [ 74.995882][ T5065] tcp_write_xmit+0x1468/0x6100 [ 75.001257][ T5065] __tcp_push_pending_frames+0x9b/0x360 [ 75.007415][ T5065] tcp_sendmsg_locked+0x42cc/0x4d00 [ 75.013232][ T5065] tcp_sendmsg+0x30/0x50 [ 75.017994][ T5065] __sock_sendmsg+0x1a6/0x270 [ 75.023190][ T5065] sock_write_iter+0x2dd/0x400 [ 75.028500][ T5065] vfs_write+0xa84/0xcb0 [ 75.033352][ T5065] ksys_write+0x1a0/0x2c0 [ 75.038207][ T5065] do_syscall_64+0xfb/0x240 [ 75.043333][ T5065] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 75.049759][ T5065] [ 75.049759][ T5065] other info that might help us debug this: [ 75.049759][ T5065] [ 75.059985][ T5065] Chain exists of: [ 75.059985][ T5065] krc.lock --> &base->lock --> &trie->lock [ 75.059985][ T5065] [ 75.071771][ T5065] Possible unsafe locking scenario: [ 75.071771][ T5065] [ 75.079232][ T5065] CPU0 CPU1 [ 75.084606][ T5065] ---- ---- [ 75.089967][ T5065] lock(&trie->lock); [ 75.094039][ T5065] lock(&base->lock); [ 75.100636][ T5065] lock(&trie->lock); [ 75.107239][ T5065] lock(krc.lock); [ 75.111049][ T5065] [ 75.111049][ T5065] *** DEADLOCK *** [ 75.111049][ T5065] [ 75.119188][ T5065] 4 locks held by sshd/5065: [ 75.123790][ T5065] #0: ffff88802d3ebf98 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 75.132958][ T5065] #1: ffff8880b952a758 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 75.142289][ T5065] #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x114/0x420 [ 75.151698][ T5065] #3: ffff88802e3dd1f8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 75.161020][ T5065] [ 75.161020][ T5065] stack backtrace: [ 75.166906][ T5065] CPU: 1 PID: 5065 Comm: sshd Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0 [ 75.176016][ T5065] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 75.186070][ T5065] Call Trace: [ 75.189438][ T5065] [ 75.192402][ T5065] dump_stack_lvl+0x1e7/0x2e0 [ 75.197121][ T5065] ? __pfx_dump_stack_lvl+0x10/0x10 [ 75.202329][ T5065] ? print_circular_bug+0x130/0x1a0 [ 75.207536][ T5065] check_noncircular+0x36a/0x4a0 [ 75.212490][ T5065] ? __pfx_check_noncircular+0x10/0x10 [ 75.217957][ T5065] ? lockdep_lock+0x123/0x2b0 [ 75.222652][ T5065] ? __pfx_validate_chain+0x10/0x10 [ 75.227855][ T5065] ? __virt_addr_valid+0x183/0x520 [ 75.232978][ T5065] ? __virt_addr_valid+0x183/0x520 [ 75.238097][ T5065] ? __virt_addr_valid+0x44e/0x520 [ 75.243217][ T5065] ? _find_first_zero_bit+0xd4/0x100 [ 75.248514][ T5065] validate_chain+0x18cb/0x58e0 [ 75.253381][ T5065] ? __pfx_validate_chain+0x10/0x10 [ 75.258589][ T5065] ? __pfx_validate_chain+0x10/0x10 [ 75.263796][ T5065] ? mark_lock+0x9a/0x350 [ 75.268220][ T5065] ? __lock_acquire+0x1346/0x1fd0 [ 75.273270][ T5065] ? mark_lock+0x9a/0x350 [ 75.277606][ T5065] ? mark_lock+0x9a/0x350 [ 75.282379][ T5065] __lock_acquire+0x1346/0x1fd0 [ 75.287241][ T5065] lock_acquire+0x1e4/0x530 [ 75.291765][ T5065] ? kvfree_call_rcu+0x18a/0x790 [ 75.296715][ T5065] ? __pfx_lock_acquire+0x10/0x10 [ 75.301742][ T5065] ? debug_object_active_state+0x239/0x360 [ 75.307637][ T5065] ? __pfx_debug_object_active_state+0x10/0x10 [ 75.313796][ T5065] ? __virt_addr_valid+0x183/0x520 [ 75.318924][ T5065] ? __virt_addr_valid+0x183/0x520 [ 75.324310][ T5065] ? __virt_addr_valid+0x44e/0x520 [ 75.329435][ T5065] ? __phys_addr+0xba/0x170 [ 75.333954][ T5065] _raw_spin_lock+0x2e/0x40 [ 75.338469][ T5065] ? kvfree_call_rcu+0x18a/0x790 [ 75.343424][ T5065] kvfree_call_rcu+0x18a/0x790 [ 75.348194][ T5065] ? _raw_spin_lock_irqsave+0xe1/0x120 [ 75.353748][ T5065] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 75.359039][ T5065] ? longest_prefix_match+0x33d/0x670 [ 75.364438][ T5065] trie_delete_elem+0x52c/0x6a0 [ 75.369387][ T5065] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 75.375047][ T5065] bpf_trace_run2+0x204/0x420 [ 75.379788][ T5065] ? bpf_trace_run2+0x114/0x420 [ 75.384648][ T5065] ? __pfx_bpf_trace_run2+0x10/0x10 [ 75.389869][ T5065] ? __pfx_debug_object_activate+0x10/0x10 [ 75.395676][ T5065] ? __tcp_transmit_skb+0x21fe/0x3b80 [ 75.401063][ T5065] enqueue_timer+0x396/0x550 [ 75.405663][ T5065] __mod_timer+0x953/0xeb0 [ 75.410098][ T5065] ? __pfx___mod_timer+0x10/0x10 [ 75.415131][ T5065] ? seqcount_lockdep_reader_access+0x157/0x220 [ 75.421382][ T5065] ? lockdep_hardirqs_on+0x99/0x150 [ 75.426591][ T5065] ? __asan_memset+0x23/0x50 [ 75.431191][ T5065] sk_reset_timer+0x23/0xc0 [ 75.435696][ T5065] tcp_event_new_data_sent+0x203/0x360 [ 75.441188][ T5065] tcp_write_xmit+0x1468/0x6100 [ 75.446095][ T5065] __tcp_push_pending_frames+0x9b/0x360 [ 75.451666][ T5065] tcp_sendmsg_locked+0x42cc/0x4d00 [ 75.456982][ T5065] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 75.462628][ T5065] ? __local_bh_enable_ip+0x168/0x200 [ 75.468012][ T5065] ? do_raw_spin_unlock+0x13c/0x8b0 [ 75.473226][ T5065] tcp_sendmsg+0x30/0x50 [ 75.477564][ T5065] __sock_sendmsg+0x1a6/0x270 [ 75.482245][ T5065] sock_write_iter+0x2dd/0x400 [ 75.487110][ T5065] ? __pfx_sock_write_iter+0x10/0x10 [ 75.492499][ T5065] ? bpf_lsm_file_permission+0x9/0x10 [ 75.497880][ T5065] ? security_file_permission+0x7f/0xa0 [ 75.503565][ T5065] vfs_write+0xa84/0xcb0 [ 75.507823][ T5065] ? __pfx_vfs_write+0x10/0x10 [ 75.512589][ T5065] ? __set_current_blocked+0x310/0x380 [ 75.518054][ T5065] ? __might_fault+0xc6/0x120 [ 75.522736][ T5065] ? __fdget_pos+0x1a2/0x320 [ 75.527341][ T5065] ksys_write+0x1a0/0x2c0 [ 75.531681][ T5065] ? __pfx_ksys_write+0x10/0x10 [ 75.536684][ T5065] ? do_syscall_64+0x10a/0x240 [ 75.541483][ T5065] ? do_syscall_64+0xb6/0x240 [ 75.546169][ T5065] do_syscall_64+0xfb/0x240 [ 75.550685][ T5065] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 75.556592][ T5065] RIP: 0033:0x7fc45eb63bf2 [ 75.561011][ T5065] 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 [ 75.580625][ T5065] RSP: 002b:00007ffe6ff5bd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 75.589043][ T5065] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007fc45eb63bf2 [ 75.597018][ T5065] RDX: 000000000000002c RSI: 00005637956bb960 RDI: 0000000000000004 [ 75.604991][ T5065] RBP: 00005637956c9220 R08: 0000000000000000 R09: 0000000000000000 [ 75.612977][ T5065] R10: 0000000000000000 R11: 0000000000000246 R12: 0000563760242aa4 [ 75.620953][ T5065] R13: 000000000000004a R14: 00005637602433e8 R15: 00007ffe6ff5bde8 [ 75.628955][ T5065]