./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4009769519 <...> Warning: Permanently added '10.128.1.98' (ED25519) to the list of known hosts. execve("./syz-executor4009769519", ["./syz-executor4009769519"], 0x7fff27b0f310 /* 10 vars */) = 0 brk(NULL) = 0x555567d06000 brk(0x555567d06d00) = 0x555567d06d00 arch_prctl(ARCH_SET_FS, 0x555567d06380) = 0 set_tid_address(0x555567d06650) = 5096 set_robust_list(0x555567d06660, 24) = 0 rseq(0x555567d06ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor4009769519", 4096) = 28 getrandom("\x60\x61\x54\xe1\x79\xdb\xd2\xbe", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555567d06d00 brk(0x555567d27d00) = 0x555567d27d00 brk(0x555567d28000) = 0x555567d28000 mprotect(0x7f5d25d41000, 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 5097 attached , child_tidptr=0x555567d06650) = 5097 [pid 5097] set_robust_list(0x555567d06660, 24) = 0 [pid 5097] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5097] setpgid(0, 0) = 0 [pid 5097] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5097] write(3, "1000", 4) = 4 [pid 5097] close(3) = 0 [pid 5097] write(1, "executing program\n", 18executing program ) = 18 [pid 5097] 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 5097] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5097] close(3) = 0 [pid 5097] 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 5097] 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 5097] close(3) = 0 [pid 5097] 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 5097] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5097] 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 5097] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [ 72.430401][ T5091] [ 72.432930][ T5091] ====================================================== [ 72.439969][ T5091] WARNING: possible circular locking dependency detected [ 72.447000][ T5091] 6.10.0-rc2-syzkaller-00242-g36534d3c5453 #0 Not tainted [ 72.454201][ T5091] ------------------------------------------------------ [ 72.461322][ T5091] sshd/5091 is trying to acquire lock: [ 72.469673][ T5091] ffff8880b9429430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 72.478358][ T5091] [ 72.478358][ T5091] but task is already holding lock: [ 72.485723][ T5091] ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 [ 72.494292][ T5091] [ 72.494292][ T5091] which lock already depends on the new lock. [ 72.494292][ T5091] [ 72.504702][ T5091] [ 72.504702][ T5091] the existing dependency chain (in reverse order) is: [ 72.513715][ T5091] [ 72.513715][ T5091] -> #1 (&base->lock){-.-.}-{2:2}: [ 72.521030][ T5091] lock_acquire+0x1ed/0x550 [ 72.526328][ T5091] _raw_spin_lock_irqsave+0xd5/0x120 [ 72.532243][ T5091] lock_timer_base+0x112/0x240 [ 72.537532][ T5091] __mod_timer+0x1ca/0xeb0 [ 72.542471][ T5091] queue_delayed_work_on+0x1ca/0x390 [ 72.548286][ T5091] kvfree_call_rcu+0x47f/0x790 [ 72.553594][ T5091] rtnl_register_internal+0x482/0x590 [ 72.559501][ T5091] rtnl_register+0x36/0x80 [ 72.564449][ T5091] ip_rt_init+0x2f6/0x3a0 [ 72.569316][ T5091] ip_init+0xe/0x20 [ 72.573649][ T5091] inet_init+0x3d8/0x580 [ 72.578419][ T5091] do_one_initcall+0x248/0x880 [ 72.583720][ T5091] do_initcall_level+0x157/0x210 [ 72.589194][ T5091] do_initcalls+0x3f/0x80 [ 72.594049][ T5091] kernel_init_freeable+0x435/0x5d0 [ 72.599784][ T5091] kernel_init+0x1d/0x2b0 [ 72.604644][ T5091] ret_from_fork+0x4b/0x80 [ 72.609590][ T5091] ret_from_fork_asm+0x1a/0x30 [ 72.614971][ T5091] [ 72.614971][ T5091] -> #0 (krc.lock){....}-{2:2}: [ 72.622102][ T5091] validate_chain+0x18e0/0x5900 [ 72.627483][ T5091] __lock_acquire+0x1346/0x1fd0 [ 72.632856][ T5091] lock_acquire+0x1ed/0x550 [ 72.637885][ T5091] _raw_spin_lock+0x2e/0x40 [ 72.642921][ T5091] kvfree_call_rcu+0x18a/0x790 [ 72.648218][ T5091] trie_delete_elem+0x546/0x6a0 [ 72.653596][ T5091] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 72.659600][ T5091] bpf_trace_run2+0x2ec/0x540 [ 72.664811][ T5091] enqueue_timer+0x3ce/0x570 [ 72.669931][ T5091] __mod_timer+0x953/0xeb0 [ 72.674874][ T5091] sk_reset_timer+0x23/0xc0 [ 72.679908][ T5091] tcp_event_new_data_sent+0x203/0x360 [ 72.685902][ T5091] tcp_write_xmit+0x18db/0x69d0 [ 72.691289][ T5091] __tcp_push_pending_frames+0x9b/0x360 [ 72.697367][ T5091] tcp_sendmsg_locked+0x43b1/0x4e10 [ 72.703094][ T5091] tcp_sendmsg+0x30/0x50 [ 72.707860][ T5091] __sock_sendmsg+0x1a6/0x270 [ 72.713071][ T5091] sock_write_iter+0x2dd/0x400 [ 72.718377][ T5091] vfs_write+0xa72/0xc90 [ 72.723173][ T5091] ksys_write+0x1a0/0x2c0 [ 72.728047][ T5091] do_syscall_64+0xf3/0x230 [ 72.733109][ T5091] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 72.739550][ T5091] [ 72.739550][ T5091] other info that might help us debug this: [ 72.739550][ T5091] [ 72.749789][ T5091] Possible unsafe locking scenario: [ 72.749789][ T5091] [ 72.757257][ T5091] CPU0 CPU1 [ 72.762711][ T5091] ---- ---- [ 72.768082][ T5091] lock(&base->lock); [ 72.772161][ T5091] lock(krc.lock); [ 72.778493][ T5091] lock(&base->lock); [ 72.785100][ T5091] lock(krc.lock); [ 72.788937][ T5091] [ 72.788937][ T5091] *** DEADLOCK *** [ 72.788937][ T5091] [ 72.797086][ T5091] 3 locks held by sshd/5091: [ 72.801687][ T5091] #0: ffff88802d281ad8 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 [ 72.810849][ T5091] #1: ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 [ 72.819829][ T5091] #2: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 72.829394][ T5091] [ 72.829394][ T5091] stack backtrace: [ 72.835413][ T5091] CPU: 0 PID: 5091 Comm: sshd Not tainted 6.10.0-rc2-syzkaller-00242-g36534d3c5453 #0 [ 72.844986][ T5091] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 [ 72.855149][ T5091] Call Trace: [ 72.858439][ T5091] [ 72.861378][ T5091] dump_stack_lvl+0x241/0x360 [ 72.866078][ T5091] ? __pfx_dump_stack_lvl+0x10/0x10 [ 72.871292][ T5091] ? print_circular_bug+0x130/0x1a0 [ 72.876503][ T5091] check_noncircular+0x36a/0x4a0 [ 72.881457][ T5091] ? __pfx_check_noncircular+0x10/0x10 [ 72.886927][ T5091] ? lockdep_lock+0x123/0x2b0 [ 72.891612][ T5091] ? mark_lock+0x9a/0x350 [ 72.895954][ T5091] validate_chain+0x18e0/0x5900 [ 72.900914][ T5091] ? __pfx_validate_chain+0x10/0x10 [ 72.906128][ T5091] ? stack_depot_save_flags+0x6e4/0x830 [ 72.911693][ T5091] ? do_raw_spin_lock+0x14f/0x370 [ 72.916730][ T5091] ? __pfx_lock_release+0x10/0x10 [ 72.921765][ T5091] ? do_raw_spin_unlock+0x13c/0x8b0 [ 72.927077][ T5091] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 72.932983][ T5091] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 72.939322][ T5091] ? stack_trace_save+0x118/0x1d0 [ 72.944369][ T5091] ? mark_lock+0x9a/0x350 [ 72.948716][ T5091] __lock_acquire+0x1346/0x1fd0 [ 72.953582][ T5091] lock_acquire+0x1ed/0x550 [ 72.958105][ T5091] ? kvfree_call_rcu+0x18a/0x790 [ 72.963055][ T5091] ? __pfx_lock_acquire+0x10/0x10 [ 72.968090][ T5091] ? __phys_addr+0xba/0x170 [ 72.972629][ T5091] _raw_spin_lock+0x2e/0x40 [ 72.977152][ T5091] ? kvfree_call_rcu+0x18a/0x790 [ 72.982096][ T5091] kvfree_call_rcu+0x18a/0x790 [ 72.986875][ T5091] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 72.992795][ T5091] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 72.998089][ T5091] ? longest_prefix_match+0x49f/0x650 [ 73.003473][ T5091] trie_delete_elem+0x546/0x6a0 [ 73.008335][ T5091] ? bpf_trace_run2+0x1fc/0x540 [ 73.013204][ T5091] bpf_prog_2c29ac5cdc6b1842+0x42/0x46 [ 73.018669][ T5091] bpf_trace_run2+0x2ec/0x540 [ 73.023364][ T5091] ? __pfx_bpf_trace_run2+0x10/0x10 [ 73.028584][ T5091] ? __pfx_debug_object_activate+0x10/0x10 [ 73.034403][ T5091] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 73.039798][ T5091] enqueue_timer+0x3ce/0x570 [ 73.044403][ T5091] __mod_timer+0x953/0xeb0 [ 73.048841][ T5091] ? __pfx___mod_timer+0x10/0x10 [ 73.053784][ T5091] ? __pfx_seqcount_lockdep_reader_access+0x10/0x10 [ 73.060395][ T5091] ? ktime_get+0x3c/0xb0 [ 73.064644][ T5091] ? __asan_memset+0x23/0x50 [ 73.069240][ T5091] sk_reset_timer+0x23/0xc0 [ 73.073760][ T5091] tcp_event_new_data_sent+0x203/0x360 [ 73.079233][ T5091] tcp_write_xmit+0x18db/0x69d0 [ 73.084100][ T5091] ? _copy_from_iter+0x26b/0x1960 [ 73.089139][ T5091] ? __pfx_lock_release+0x10/0x10 [ 73.094169][ T5091] ? __alloc_skb+0x2d5/0x440 [ 73.098783][ T5091] __tcp_push_pending_frames+0x9b/0x360 [ 73.104356][ T5091] tcp_sendmsg_locked+0x43b1/0x4e10 [ 73.109587][ T5091] ? __pfx_tcp_sendmsg_locked+0x10/0x10 [ 73.115150][ T5091] ? __local_bh_enable_ip+0x168/0x200 [ 73.120526][ T5091] ? do_raw_spin_unlock+0x13c/0x8b0 [ 73.125756][ T5091] tcp_sendmsg+0x30/0x50 [ 73.130005][ T5091] __sock_sendmsg+0x1a6/0x270 [ 73.134692][ T5091] sock_write_iter+0x2dd/0x400 [ 73.139464][ T5091] ? __pfx_sock_write_iter+0x10/0x10 [ 73.144848][ T5091] ? bpf_lsm_file_permission+0x9/0x10 [ 73.150227][ T5091] ? security_file_permission+0x7f/0xa0 [ 73.155783][ T5091] vfs_write+0xa72/0xc90 [ 73.160037][ T5091] ? __pfx_sock_write_iter+0x10/0x10 [ 73.165359][ T5091] ? __pfx_vfs_write+0x10/0x10 [ 73.170131][ T5091] ? __set_current_blocked+0x310/0x380 [ 73.175600][ T5091] ? __might_fault+0xc6/0x120 [ 73.180299][ T5091] ksys_write+0x1a0/0x2c0 [ 73.184644][ T5091] ? __pfx_ksys_write+0x10/0x10 [ 73.189518][ T5091] ? do_syscall_64+0x100/0x230 [ 73.194294][ T5091] ? do_syscall_64+0xb6/0x230 [ 73.198977][ T5091] do_syscall_64+0xf3/0x230 [ 73.203492][ T5091] ? clear_bhb_loop+0x35/0x90 [ 73.208177][ T5091] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 73.214090][ T5091] RIP: 0033:0x7efcbe8d8bf2 [ 73.218515][ T5091] 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 [ 73.238309][ T5091] RSP: 002b:00007ffdd09fe0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 73.246736][ T5091] RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007efcbe8d8bf2 [ 73.254712][ T5091] RDX: 000000000000002c RSI: 00005625a3d65960 RDI: 0000000000000004 [ 73.262777][ T5091] RBP: 00005625a3d73220 R08: 0000000000000000 R09: 0000000000000000 [ 73.270756][ T5091] R10: 0000000000000000 R11: 0000000000000246 R12: 000056257909daa4 [ 73.278734][ T5091] R13: 0000000000000048 R14: 000056257909e3e8 R15: 00007ffdd09fe128 [ 73.286733][ T5091]