./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3044610510 <...> Warning: Permanently added '10.128.1.136' (ED25519) to the list of known hosts. execve("./syz-executor3044610510", ["./syz-executor3044610510"], 0x7fff722f8c70 /* 10 vars */) = 0 brk(NULL) = 0x5555738b7000 brk(0x5555738b7d00) = 0x5555738b7d00 arch_prctl(ARCH_SET_FS, 0x5555738b7380) = 0 set_tid_address(0x5555738b7650) = 5091 set_robust_list(0x5555738b7660, 24) = 0 rseq(0x5555738b7ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3044610510", 4096) = 28 getrandom("\x3a\x45\x82\x0e\xb7\xf9\xfc\x73", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555738b7d00 brk(0x5555738d8d00) = 0x5555738d8d00 brk(0x5555738d9000) = 0x5555738d9000 mprotect(0x7f48b8739000, 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 5092 attached , child_tidptr=0x5555738b7650) = 5092 [pid 5092] set_robust_list(0x5555738b7660, 24) = 0 [pid 5092] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5092] setpgid(0, 0) = 0 [pid 5092] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5092] write(3, "1000", 4) = 4 [pid 5092] close(3) = 0 [pid 5092] write(1, "executing program\n", 18executing program ) = 18 [pid 5092] 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 5092] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5092] close(3) = 0 [pid 5092] 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 5092] 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 5092] close(3) = 0 [pid 5092] 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 5092] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5092] 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 5092] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [ 55.748056][ T5086] [ 55.750396][ T5086] ====================================================== [ 55.757393][ T5086] WARNING: possible circular locking dependency detected [ 55.764394][ T5086] 6.10.0-rc2-syzkaller-00242-g36534d3c5453 #0 Not tainted [ 55.771476][ T5086] ------------------------------------------------------ [ 55.778467][ T5086] sshd/5086 is trying to acquire lock: [ 55.783903][ T5086] ffff8880b9429430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 55.792524][ T5086] [ 55.792524][ T5086] but task is already holding lock: [ 55.799864][ T5086] ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 55.808719][ T5086] [ 55.808719][ T5086] which lock already depends on the new lock. [ 55.808719][ T5086] [ 55.819100][ T5086] [ 55.819100][ T5086] the existing dependency chain (in reverse order) is: [ 55.828091][ T5086] [ 55.828091][ T5086] -> #1 (&base->lock){-.-.}-{2:2}: [ 55.835371][ T5086] lock_acquire+0x1ed/0x550 [ 55.840382][ T5086] _raw_spin_lock_irqsave+0xd5/0x120 [ 55.846178][ T5086] lock_timer_base+0x112/0x240 [ 55.851445][ T5086] __mod_timer+0x1ca/0xeb0 [ 55.856364][ T5086] queue_delayed_work_on+0x1ca/0x390 [ 55.862153][ T5086] kvfree_call_rcu+0x47f/0x790 [ 55.867419][ T5086] rtnl_register_internal+0x482/0x590 [ 55.873298][ T5086] rtnl_register+0x36/0x80 [ 55.878220][ T5086] ip_rt_init+0x2f6/0x3a0 [ 55.883053][ T5086] ip_init+0xe/0x20 [ 55.887360][ T5086] inet_init+0x3d8/0x580 [ 55.892105][ T5086] do_one_initcall+0x248/0x880 [ 55.897374][ T5086] do_initcall_level+0x157/0x210 [ 55.902823][ T5086] do_initcalls+0x3f/0x80 [ 55.907654][ T5086] kernel_init_freeable+0x435/0x5d0 [ 55.913358][ T5086] kernel_init+0x1d/0x2b0 [ 55.918192][ T5086] ret_from_fork+0x4b/0x80 [ 55.923115][ T5086] ret_from_fork_asm+0x1a/0x30 [ 55.928384][ T5086] [ 55.928384][ T5086] -> #0 (krc.lock){....}-{2:2}: [ 55.935408][ T5086] validate_chain+0x18e0/0x5900 [ 55.940763][ T5086] __lock_acquire+0x1346/0x1fd0 [ 55.946113][ T5086] lock_acquire+0x1ed/0x550 [ 55.951119][ T5086] _raw_spin_lock+0x2e/0x40 [ 55.956126][ T5086] kvfree_call_rcu+0x18a/0x790 [ 55.961394][ T5086] trie_delete_elem+0x546/0x6a0 [ 55.966750][ T5086] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 55.972716][ T5086] bpf_trace_run2+0x2ec/0x540 [ 55.977898][ T5086] enqueue_timer+0x3ce/0x570 [ 55.982993][ T5086] __mod_timer+0x953/0xeb0 [ 55.987911][ T5086] sk_reset_timer+0x23/0xc0 [ 55.992918][ T5086] tcp_event_new_data_sent+0x203/0x360 [ 55.998883][ T5086] tcp_write_xmit+0x18db/0x69d0 [ 56.004237][ T5086] __tcp_push_pending_frames+0x9b/0x360 [ 56.010285][ T5086] tcp_sendmsg_locked+0x43b1/0x4e10 [ 56.015984][ T5086] tcp_sendmsg+0x30/0x50 [ 56.020727][ T5086] __sock_sendmsg+0x1a6/0x270 [ 56.025908][ T5086] sock_write_iter+0x2dd/0x400 [ 56.031175][ T5086] vfs_write+0xa72/0xc90 [ 56.035921][ T5086] ksys_write+0x1a0/0x2c0 [ 56.040752][ T5086] do_syscall_64+0xf3/0x230 [ 56.045761][ T5086] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 56.052158][ T5086] [ 56.052158][ T5086] other info that might help us debug this: [ 56.052158][ T5086] [ 56.062362][ T5086] Possible unsafe locking scenario: [ 56.062362][ T5086] [ 56.069790][ T5086] CPU0 CPU1 [ 56.075133][ T5086] ---- ---- [ 56.080473][ T5086] lock(&base->lock); [ 56.084528][ T5086] lock(krc.lock); [ 56.090838][ T5086] lock(&base->lock); [ 56.097409][ T5086] lock(krc.lock); [ 56.101201][ T5086] [ 56.101201][ T5086] *** DEADLOCK *** [ 56.101201][ T5086] [ 56.109321][ T5086] 3 locks held by sshd/5086: [ 56.113886][ T5086] #0: ffff88802daa4bd8 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 56.123007][ T5086] #1: ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 56.132299][ T5086] #2: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 56.141686][ T5086] [ 56.141686][ T5086] stack backtrace: [ 56.147559][ T5086] CPU: 0 PID: 5086 Comm: sshd Not tainted 6.10.0-rc2-syzkaller-00242-g36534d3c5453 #0 [ 56.157080][ T5086] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 [ 56.167122][ T5086] Call Trace: [ 56.170384][ T5086] [ 56.173301][ T5086] dump_stack_lvl+0x241/0x360 [ 56.177965][ T5086] ? __pfx_dump_stack_lvl+0x10/0x10 [ 56.183150][ T5086] ? print_circular_bug+0x130/0x1a0 [ 56.188335][ T5086] check_noncircular+0x36a/0x4a0 [ 56.193258][ T5086] ? __pfx_check_noncircular+0x10/0x10 [ 56.198702][ T5086] ? lockdep_lock+0x123/0x2b0 [ 56.203360][ T5086] ? mark_lock+0x9a/0x350 [ 56.207678][ T5086] validate_chain+0x18e0/0x5900 [ 56.212524][ T5086] ? __pfx_validate_chain+0x10/0x10 [ 56.217705][ T5086] ? stack_depot_save_flags+0x6e4/0x830 [ 56.223240][ T5086] ? do_raw_spin_lock+0x14f/0x370 [ 56.228249][ T5086] ? __pfx_lock_release+0x10/0x10 [ 56.233269][ T5086] ? do_raw_spin_unlock+0x13c/0x8b0 [ 56.238463][ T5086] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 56.244347][ T5086] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 56.250658][ T5086] ? stack_trace_save+0x118/0x1d0 [ 56.255673][ T5086] ? mark_lock+0x9a/0x350 [ 56.259995][ T5086] __lock_acquire+0x1346/0x1fd0 [ 56.264841][ T5086] lock_acquire+0x1ed/0x550 [ 56.269333][ T5086] ? kvfree_call_rcu+0x18a/0x790 [ 56.274263][ T5086] ? __pfx_lock_acquire+0x10/0x10 [ 56.279279][ T5086] ? __phys_addr+0xba/0x170 [ 56.283775][ T5086] _raw_spin_lock+0x2e/0x40 [ 56.288267][ T5086] ? kvfree_call_rcu+0x18a/0x790 [ 56.293191][ T5086] kvfree_call_rcu+0x18a/0x790 [ 56.297941][ T5086] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 56.303823][ T5086] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 56.309093][ T5086] ? longest_prefix_match+0x49f/0x650 [ 56.314450][ T5086] trie_delete_elem+0x546/0x6a0 [ 56.319291][ T5086] ? bpf_trace_run2+0x1fc/0x540 [ 56.324132][ T5086] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 56.329572][ T5086] bpf_trace_run2+0x2ec/0x540 [ 56.334242][ T5086] ? __pfx_bpf_trace_run2+0x10/0x10 [ 56.339429][ T5086] ? __pfx_debug_object_activate+0x10/0x10 [ 56.345217][ T5086] ? __tcp_transmit_skb+0x21fe/0x3b80 [ 56.350580][ T5086] enqueue_timer+0x3ce/0x570 [ 56.355159][ T5086] __mod_timer+0x953/0xeb0 [ 56.359581][ T5086] ? __pfx___mod_timer+0x10/0x10 [ 56.364520][ T5086] ? __pfx_seqcount_lockdep_reader_access+0x10/0x10 [ 56.371098][ T5086] ? ktime_get+0x3c/0xb0 [ 56.375333][ T5086] ? __asan_memset+0x23/0x50 [ 56.379915][ T5086] sk_reset_timer+0x23/0xc0 [ 56.384409][ T5086] tcp_event_new_data_sent+0x203/0x360 [ 56.389860][ T5086] tcp_write_xmit+0x18db/0x69d0 [ 56.394705][ T5086] ? _copy_from_iter+0x26b/0x1960 [ 56.399718][ T5086] ? __pfx_lock_release+0x10/0x10 [ 56.404726][ T5086] ? __alloc_skb+0x2d5/0x440 [ 56.409306][ T5086] __tcp_push_pending_frames+0x9b/0x360 [ 56.414838][ T5086] tcp_sendmsg_locked+0x43b1/0x4e10 [ 56.420035][ T5086] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 56.425572][ T5086] ? __local_bh_enable_ip+0x168/0x200 [ 56.430941][ T5086] ? do_raw_spin_unlock+0x13c/0x8b0 [ 56.436131][ T5086] tcp_sendmsg+0x30/0x50 [ 56.440359][ T5086] __sock_sendmsg+0x1a6/0x270 [ 56.445024][ T5086] sock_write_iter+0x2dd/0x400 [ 56.449772][ T5086] ? __pfx_sock_write_iter+0x10/0x10 [ 56.455048][ T5086] ? bpf_lsm_file_permission+0x9/0x10 [ 56.460404][ T5086] ? security_file_permission+0x7f/0xa0 [ 56.465935][ T5086] vfs_write+0xa72/0xc90 [ 56.470167][ T5086] ? __pfx_sock_write_iter+0x10/0x10 [ 56.475439][ T5086] ? __pfx_vfs_write+0x10/0x10 [ 56.480186][ T5086] ? __set_current_blocked+0x310/0x380 [ 56.485634][ T5086] ? __might_fault+0xc6/0x120 [ 56.490302][ T5086] ksys_write+0x1a0/0x2c0 [ 56.494624][ T5086] ? __pfx_ksys_write+0x10/0x10 [ 56.499461][ T5086] ? do_syscall_64+0x100/0x230 [ 56.504211][ T5086] ? do_syscall_64+0xb6/0x230 [ 56.508875][ T5086] do_syscall_64+0xf3/0x230 [ 56.513364][ T5086] ? clear_bhb_loop+0x35/0x90 [ 56.518026][ T5086] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 56.523914][ T5086] RIP: 0033:0x7fcea8316bf2 [ 56.528315][ T5086] 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 [ 56.547904][ T5086] RSP: 002b:00007ffcb4a254a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 56.556302][ T5086] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007fcea8316bf2 [ 56.564256][ T5086] RDX: 000000000000002c RSI: 000055ad1df32960 RDI: 0000000000000004 [ 56.572209][ T5086] RBP: 000055ad1df3bde0 R08: 0000000000000000 R09: 0000000000000000 [ 56.580162][ T5086] R10: 0000000000000000 R11: 0000000000000246 R12: 000055ad0f93daa4 [ 56.588115][ T5086] R13: 0000000000000037 R14: 000055ad0f93e3e8 R15: 00007ffcb4a25518 [ 56.596074][ T5086]