./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1227385730 <...> Warning: Permanently added '10.128.1.254' (ED25519) to the list of known hosts. execve("./syz-executor1227385730", ["./syz-executor1227385730"], 0x7ffd7d9d08e0 /* 10 vars */) = 0 brk(NULL) = 0x555578abd000 brk(0x555578abdd00) = 0x555578abdd00 arch_prctl(ARCH_SET_FS, 0x555578abd380) = 0 set_tid_address(0x555578abd650) = 5093 set_robust_list(0x555578abd660, 24) = 0 rseq(0x555578abdca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1227385730", 4096) = 28 getrandom("\x85\xcc\x96\xb2\x58\x46\xe4\xca", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555578abdd00 brk(0x555578aded00) = 0x555578aded00 brk(0x555578adf000) = 0x555578adf000 mprotect(0x7f6443166000, 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 5094 attached , child_tidptr=0x555578abd650) = 5094 [pid 5094] set_robust_list(0x555578abd660, 24) = 0 [pid 5094] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5094] setpgid(0, 0) = 0 [pid 5094] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5094] write(3, "1000", 4) = 4 [pid 5094] close(3executing program ) = 0 [pid 5094] write(1, "executing program\n", 18) = 18 [pid 5094] bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_UNSPEC, insn_cnt=12, insns=0x20000440, license=NULL, 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=4294966948, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EFAULT (Bad address) [pid 5094] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5094] close(3) = 0 [pid 5094] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=65537, max_entries=8, 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 5094] bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_UNSPEC, insn_cnt=12, insns=0x20000440, license=NULL, 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) = -1 EFAULT (Bad address) [pid 5094] close(3) = 0 [pid 5094] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=3983, 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 5094] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5094] 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) = 5 [pid 5094] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [ 73.728551][ T5088] [ 73.730950][ T5088] ====================================================== [ 73.737963][ T5088] WARNING: possible circular locking dependency detected [ 73.744983][ T5088] 6.10.0-rc1-syzkaller-00310-g98aa546af5e4 #0 Not tainted [ 73.752082][ T5088] ------------------------------------------------------ [ 73.759096][ T5088] sshd/5088 is trying to acquire lock: [ 73.764575][ T5088] ffff8880b9529430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 73.773310][ T5088] [ 73.773310][ T5088] but task is already holding lock: [ 73.780666][ T5088] ffff8880b952a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 [ 73.789190][ T5088] [ 73.789190][ T5088] which lock already depends on the new lock. [ 73.789190][ T5088] [ 73.799580][ T5088] [ 73.799580][ T5088] the existing dependency chain (in reverse order) is: [ 73.808582][ T5088] [ 73.808582][ T5088] -> #1 (&base->lock){-.-.}-{2:2}: [ 73.815897][ T5088] lock_acquire+0x1ed/0x550 [ 73.820914][ T5088] _raw_spin_lock_irqsave+0xd5/0x120 [ 73.826726][ T5088] lock_timer_base+0x112/0x240 [ 73.832009][ T5088] __mod_timer+0x1ca/0xeb0 [ 73.836942][ T5088] queue_delayed_work_on+0x1ca/0x390 [ 73.842773][ T5088] kvfree_call_rcu+0x47f/0x790 [ 73.848058][ T5088] rtnl_register_internal+0x482/0x590 [ 73.853970][ T5088] rtnl_register+0x36/0x80 [ 73.858909][ T5088] ip_rt_init+0x2bd/0x360 [ 73.863757][ T5088] ip_init+0xe/0x20 [ 73.868088][ T5088] inet_init+0x3d8/0x580 [ 73.872847][ T5088] do_one_initcall+0x248/0x880 [ 73.878183][ T5088] do_initcall_level+0x157/0x210 [ 73.883651][ T5088] do_initcalls+0x3f/0x80 [ 73.888495][ T5088] kernel_init_freeable+0x435/0x5d0 [ 73.894207][ T5088] kernel_init+0x1d/0x2b0 [ 73.899068][ T5088] ret_from_fork+0x4b/0x80 [ 73.904007][ T5088] ret_from_fork_asm+0x1a/0x30 [ 73.909295][ T5088] [ 73.909295][ T5088] -> #0 (krc.lock){....}-{2:2}: [ 73.916352][ T5088] validate_chain+0x18e0/0x5900 [ 73.921726][ T5088] __lock_acquire+0x1346/0x1fd0 [ 73.927113][ T5088] lock_acquire+0x1ed/0x550 [ 73.932137][ T5088] _raw_spin_lock+0x2e/0x40 [ 73.937187][ T5088] kvfree_call_rcu+0x18a/0x790 [ 73.942487][ T5088] trie_delete_elem+0x546/0x6a0 [ 73.947849][ T5088] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 73.953830][ T5088] bpf_trace_run2+0x2ec/0x540 [ 73.959054][ T5088] enqueue_timer+0x3ce/0x570 [ 73.964161][ T5088] __mod_timer+0xa0e/0xeb0 [ 73.969088][ T5088] sk_reset_timer+0x23/0xc0 [ 73.974101][ T5088] tcp_event_new_data_sent+0x203/0x360 [ 73.980073][ T5088] tcp_write_xmit+0x18dc/0x6a10 [ 73.985439][ T5088] __tcp_push_pending_frames+0x9b/0x360 [ 73.991497][ T5088] tcp_sendmsg_locked+0x4313/0x4d70 [ 73.997216][ T5088] tcp_sendmsg+0x30/0x50 [ 74.001999][ T5088] __sock_sendmsg+0x1a6/0x270 [ 74.007215][ T5088] sock_write_iter+0x2dd/0x400 [ 74.012496][ T5088] vfs_write+0xa72/0xc90 [ 74.017257][ T5088] ksys_write+0x1a0/0x2c0 [ 74.022102][ T5088] do_syscall_64+0xf3/0x230 [ 74.027122][ T5088] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 74.033531][ T5088] [ 74.033531][ T5088] other info that might help us debug this: [ 74.033531][ T5088] [ 74.043743][ T5088] Possible unsafe locking scenario: [ 74.043743][ T5088] [ 74.051180][ T5088] CPU0 CPU1 [ 74.056539][ T5088] ---- ---- [ 74.061895][ T5088] lock(&base->lock); [ 74.065958][ T5088] lock(krc.lock); [ 74.072280][ T5088] lock(&base->lock); [ 74.078900][ T5088] lock(krc.lock); [ 74.082700][ T5088] [ 74.082700][ T5088] *** DEADLOCK *** [ 74.082700][ T5088] [ 74.090849][ T5088] 3 locks held by sshd/5088: [ 74.095431][ T5088] #0: ffff88807c8d2718 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 74.104582][ T5088] #1: ffff8880b952a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 [ 74.113540][ T5088] #2: ffffffff8e333f60 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 74.122950][ T5088] [ 74.122950][ T5088] stack backtrace: [ 74.128833][ T5088] CPU: 1 PID: 5088 Comm: sshd Not tainted 6.10.0-rc1-syzkaller-00310-g98aa546af5e4 #0 [ 74.138366][ T5088] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 [ 74.148414][ T5088] Call Trace: [ 74.151700][ T5088] [ 74.154639][ T5088] dump_stack_lvl+0x241/0x360 [ 74.159337][ T5088] ? __pfx_dump_stack_lvl+0x10/0x10 [ 74.164537][ T5088] ? print_circular_bug+0x130/0x1a0 [ 74.169738][ T5088] check_noncircular+0x36a/0x4a0 [ 74.174679][ T5088] ? __pfx_check_noncircular+0x10/0x10 [ 74.180139][ T5088] ? lockdep_lock+0x123/0x2b0 [ 74.184829][ T5088] ? mark_lock+0x9a/0x350 [ 74.189163][ T5088] validate_chain+0x18e0/0x5900 [ 74.194020][ T5088] ? __pfx_validate_chain+0x10/0x10 [ 74.199214][ T5088] ? stack_depot_save_flags+0x6e4/0x830 [ 74.204778][ T5088] ? do_raw_spin_lock+0x14f/0x370 [ 74.209799][ T5088] ? __pfx_lock_release+0x10/0x10 [ 74.214820][ T5088] ? do_raw_spin_unlock+0x13c/0x8b0 [ 74.220024][ T5088] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 74.225920][ T5088] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 74.232250][ T5088] ? stack_trace_save+0x118/0x1d0 [ 74.237274][ T5088] ? mark_lock+0x9a/0x350 [ 74.241604][ T5088] __lock_acquire+0x1346/0x1fd0 [ 74.246462][ T5088] lock_acquire+0x1ed/0x550 [ 74.250975][ T5088] ? kvfree_call_rcu+0x18a/0x790 [ 74.255914][ T5088] ? __pfx_lock_acquire+0x10/0x10 [ 74.260946][ T5088] ? __phys_addr+0xba/0x170 [ 74.265454][ T5088] _raw_spin_lock+0x2e/0x40 [ 74.269959][ T5088] ? kvfree_call_rcu+0x18a/0x790 [ 74.274897][ T5088] kvfree_call_rcu+0x18a/0x790 [ 74.279665][ T5088] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 74.285559][ T5088] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 74.290849][ T5088] ? longest_prefix_match+0x49f/0x650 [ 74.296218][ T5088] trie_delete_elem+0x546/0x6a0 [ 74.301071][ T5088] ? bpf_trace_run2+0x1fc/0x540 [ 74.305928][ T5088] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 74.311384][ T5088] bpf_trace_run2+0x2ec/0x540 [ 74.316068][ T5088] ? __pfx_bpf_trace_run2+0x10/0x10 [ 74.321272][ T5088] ? __pfx_debug_object_activate+0x10/0x10 [ 74.327080][ T5088] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 74.332458][ T5088] enqueue_timer+0x3ce/0x570 [ 74.337048][ T5088] __mod_timer+0xa0e/0xeb0 [ 74.341466][ T5088] ? __pfx___mod_timer+0x10/0x10 [ 74.346398][ T5088] ? __pfx_seqcount_lockdep_reader_access+0x10/0x10 [ 74.352994][ T5088] ? ktime_get+0x3c/0xb0 [ 74.357236][ T5088] ? __asan_memset+0x23/0x50 [ 74.361822][ T5088] sk_reset_timer+0x23/0xc0 [ 74.366347][ T5088] tcp_event_new_data_sent+0x203/0x360 [ 74.371809][ T5088] tcp_write_xmit+0x18dc/0x6a10 [ 74.376669][ T5088] ? __virt_addr_valid+0x183/0x520 [ 74.381785][ T5088] ? __alloc_skb+0x2d5/0x440 [ 74.386402][ T5088] __tcp_push_pending_frames+0x9b/0x360 [ 74.391976][ T5088] tcp_sendmsg_locked+0x4313/0x4d70 [ 74.397218][ T5088] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 74.403566][ T5088] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 74.409214][ T5088] ? __local_bh_enable_ip+0x168/0x200 [ 74.414632][ T5088] ? do_raw_spin_unlock+0x13c/0x8b0 [ 74.419851][ T5088] tcp_sendmsg+0x30/0x50 [ 74.424117][ T5088] __sock_sendmsg+0x1a6/0x270 [ 74.428804][ T5088] sock_write_iter+0x2dd/0x400 [ 74.433565][ T5088] ? __pfx_sock_write_iter+0x10/0x10 [ 74.438853][ T5088] ? bpf_lsm_file_permission+0x9/0x10 [ 74.444237][ T5088] ? security_file_permission+0x7f/0xa0 [ 74.449804][ T5088] vfs_write+0xa72/0xc90 [ 74.454059][ T5088] ? __pfx_sock_write_iter+0x10/0x10 [ 74.459344][ T5088] ? __pfx_vfs_write+0x10/0x10 [ 74.464107][ T5088] ? __set_current_blocked+0x310/0x380 [ 74.469561][ T5088] ? __might_fault+0xc6/0x120 [ 74.474246][ T5088] ksys_write+0x1a0/0x2c0 [ 74.478592][ T5088] ? __pfx_ksys_write+0x10/0x10 [ 74.483440][ T5088] ? do_syscall_64+0x100/0x230 [ 74.488287][ T5088] ? do_syscall_64+0xb6/0x230 [ 74.492973][ T5088] do_syscall_64+0xf3/0x230 [ 74.497473][ T5088] ? clear_bhb_loop+0x35/0x90 [ 74.502152][ T5088] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 74.508061][ T5088] RIP: 0033:0x7f9202d16bf2 [ 74.512475][ T5088] 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 [ 74.532100][ T5088] RSP: 002b:00007ffd08ea7398 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 74.540523][ T5088] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007f9202d16bf2 [ 74.548489][ T5088] RDX: 000000000000002c RSI: 000055acd7b14960 RDI: 0000000000000004 [ 74.556453][ T5088] RBP: 000055acd7b22220 R08: 0000000000000000 R09: 0000000000000000 [ 74.564419][ T5088] R10: 0000000000000000 R11: 0000000000000246 R12: 000055acb3b4eaa4 [ 74.572381][ T5088] R13: 0000000000000049 R14: 000055acb3b4f3e8 R15: 00007ffd08ea7408 [ 74.580356][ T5088]