ci-upstream-net-this-kasan-gce/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci-upstream-net-this-kasan-gce/syz-executor4004633820 <...> Warning: Permanently added '10.128.0.181' (ED25519) to the list of known hosts. execve("ci-upstream-net-this-kasan-gce/syz-executor4004633820", ["ci-upstream-net-this-kasan-gce/syz-executor4004633820"], 0x7fffceb68960 /* 10 vars */) = 0 brk(NULL) = 0x5555576b9000 brk(0x5555576b9d80) = 0x5555576b9d80 arch_prctl(ARCH_SET_FS, 0x5555576b9400) = 0 set_tid_address(0x5555576b96d0) = 5633 set_robust_list(0x5555576b96e0, 24) = 0 rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED, rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0, granted=0, __reserved=0}, __reserved=0}, 33, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlinkat(AT_FDCWD, "/proc/self/exe", "/root/ci-upstream-net-this-kasan-gce/syz-executor4004633820", 4096) = 59 getrandom("\x49\x17\x5b\x04\x5c\xaf\xc4\xb4", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555576b9d80 brk(0x5555576dad80) = 0x5555576dad80 brk(0x5555576db000) = 0x5555576db000 mprotect(0x7fcf58931000, 20480, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 executing program write(1, "executing program\n", 18) = 18 socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER) = 3 sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=[{nlmsg_len=144, nlmsg_type=0x100 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|0x600, nlmsg_seq=0, nlmsg_pid=0}, "\x02\x00\x00\x00\x34\x00\x01\x80\x14\x00\x01\x80\x08\x00\x01\x00\x01\x02\x03\x04\x08\x00\x02\x00\x05\x06\x07\x08\x1c\x00\x02\x80\x05\x00\x01\x00\x06\x00\x00\x00\x06\x00\x02\x00\x04\xd2\x00\x00\x06\x00\x03\x00\x00\x15\x00\x00\x34\x00\x02\x80\x14\x00\x01\x80\x08\x00\x01\x00\x05\x06\x07\x08\x08\x00\x02\x00\x01\x02\x03\x04\x1c\x00\x02\x80\x05\x00\x01\x00\x06\x00\x00\x00\x06\x00\x02\x00\x00\x15\x00\x00"...], iov_len=144}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 144 sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=[{nlmsg_len=200, nlmsg_type=NFNL_SUBSYS_CTNETLINK_EXP<<8|IPCTNL_MSG_EXP_NEW, nlmsg_flags=NLM_F_REQUEST|NLM_F_EXCL|NLM_F_CREATE, nlmsg_seq=0, nlmsg_pid=0}, {nfgen_family=AF_INET, version=NFNETLINK_V0, res_id=htons(0)}, [[{nla_len=52, nla_type=NLA_F_NESTED|0x1}, "\x14\x00\x01\x80\x08\x00\x01\x00\x01\x02\x03\x04\x08\x00\x02\x00\x05\x06\x07\x08\x1c\x00\x02\x80\x05\x00\x01\x00\x06\x00\x00\x00\x06\x00\x02\x00\x04\xd2\x00\x00\x06\x00\x03\x00\x00\x15\x00\x00"], [{nla_len=52, nla_type=NLA_F_NESTED|0x2}, "\x14\x00\x01\x80\x08\x00\x01\x00\x05\x06\x07\x08\x08\x00\x02\x00\x01\x02\x03\x04\x1c\x00\x02\x80\x05\x00\x01\x00\x06\x00\x00\x00\x06\x00\x02\x00\x00\x14\x00\x00\x06\x00\x03\x00\x9c\x40\x00\x00"], [{nla_len=52, nla_type=NLA_F_NESTED|0x3}, "\x14\x00\x01\x80\x08\x00\x01\x00\xff\xff\xff\xff\x08\x00\x02\x00\xff\xff\xff\xff\x1c\x00\x02\x80\x05\x00\x01\x00\xff\x00\x00\x00\x06\x00\x02\x00\x00\x00\x00\x00\x06\x00\x03\x00\xff\xff\x00\x00"], [{nla_len=22, nla_type=0xb}, "\x6e\x61\x74\x2d\x66\x6f\x6c\x6c\x6f\x77\x2d\x6d\x61\x73\x74\x65\x72\x00"]]], iov_len=200}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 200 socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER) = 4 [ 95.779462][ T5633] [ 95.782341][ T5633] ============================= [ 95.787210][ T5633] WARNING: suspicious RCU usage [ 95.792329][ T5633] syzkaller #0 Not tainted [ 95.796815][ T5633] ----------------------------- [ 95.801770][ T5633] net/netfilter/nf_conntrack_netlink.c:3395 suspicious rcu_dereference_check() usage! [ 95.811384][ T5633] [ 95.811384][ T5633] other info that might help us debug this: [ 95.811384][ T5633] [ 95.821814][ T5633] [ 95.821814][ T5633] rcu_scheduler_active = 2, debug_locks = 1 [ 95.829973][ T5633] locks held by syz-executor400/5633: 2, last CPU#0: [ 95.836973][ T5633] #0: ffffffff9aee8320 (nfnl_subsys_ctnetlink_exp){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0xa69/0x12b0 [ 95.848019][ T5633] #1: ffffffff8ea74d58 (nf_conntrack_expect_lock){+...}-{3:3}, at: nf_ct_expect_iterate_net+0x38/0x180 [ 95.859330][ T5633] [ 95.859330][ T5633] stack backtrace: [ 95.865430][ T5633] CPU: 0 UID: 0 PID: 5633 Comm: syz-executor400 Not tainted syzkaller #0 PREEMPT(full) [ 95.875182][ T5633] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 95.885424][ T5633] Call Trace: [ 95.888736][ T5633] [ 95.891771][ T5633] dump_stack_lvl+0xe8/0x150 [ 95.896392][ T5633] lockdep_rcu_suspicious+0x140/0x1d0 [ 95.901878][ T5633] expect_iter_name+0xfb/0x100 [ 95.906763][ T5633] nf_ct_expect_iterate_net+0xf2/0x180 [ 95.912257][ T5633] ? __pfx_expect_iter_name+0x10/0x10 [ 95.917810][ T5633] ctnetlink_del_expect+0x45d/0x640 [ 95.923143][ T5633] ? __pfx_ctnetlink_del_expect+0x10/0x10 [ 95.929027][ T5633] nfnetlink_rcv_msg+0xcc2/0x12b0 [ 95.934551][ T5633] ? is_bpf_text_address+0x292/0x2b0 [ 95.940002][ T5633] ? nfnetlink_rcv_msg+0x228/0x12b0 [ 95.945541][ T5633] ? __pfx_nfnetlink_rcv_msg+0x10/0x10 [ 95.951179][ T5633] netlink_rcv_skb+0x226/0x4a0 [ 95.956080][ T5633] ? __pfx_nfnetlink_rcv_msg+0x10/0x10 [ 95.961838][ T5633] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 95.967180][ T5633] ? bpf_lsm_capable+0x9/0x20 [ 95.971893][ T5633] ? security_capable+0x7e/0x2c0 [ 95.976973][ T5633] nfnetlink_rcv+0x2b9/0x28c0 [ 95.981712][ T5633] ? kernel_text_address+0xa5/0xe0 [ 95.987209][ T5633] ? __kernel_text_address+0xd/0x30 [ 95.992441][ T5633] ? unwind_get_return_address+0x4d/0x90 [ 95.998156][ T5633] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 96.004361][ T5633] ? arch_stack_walk+0xfb/0x150 [ 96.009541][ T5633] ? stack_trace_save+0xa9/0x100 [ 96.014565][ T5633] ? __lock_acquire+0x747/0x2de0 [ 96.019548][ T5633] ? __pfx_nfnetlink_rcv+0x10/0x10 [ 96.024701][ T5633] ? __kasan_slab_alloc+0x6c/0x80 [ 96.029765][ T5633] ? kmem_cache_alloc_node_noprof+0x354/0x610 [ 96.035873][ T5633] ? __alloc_skb+0x27a/0x7a0 [ 96.040680][ T5633] ? netlink_sendmsg+0x5d4/0xb40 [ 96.045686][ T5633] ? sock_sendmsg_nosec+0x13a/0x180 [ 96.050961][ T5633] ? ____sys_sendmsg+0x54e/0x850 [ 96.055958][ T5633] ? __lock_acquire+0x747/0x2de0 [ 96.060933][ T5633] ? __netlink_lookup+0xc6/0x8b0 [ 96.066034][ T5633] ? lock_acquire+0x115/0x350 [ 96.070823][ T5633] ? netlink_deliver_tap+0x2e/0x1b0 [ 96.076063][ T5633] ? netlink_deliver_tap+0x2e/0x1b0 [ 96.081307][ T5633] ? netlink_deliver_tap+0x2e/0x1b0 [ 96.087037][ T5633] netlink_unicast+0x7bd/0x940 [ 96.091984][ T5633] netlink_sendmsg+0x813/0xb40 [ 96.097065][ T5633] ? __pfx_netlink_sendmsg+0x10/0x10 [ 96.102433][ T5633] ? apparmor_socket_sendmsg+0x18b/0x360 [ 96.108184][ T5633] ? __pfx_netlink_sendmsg+0x10/0x10 [ 96.113635][ T5633] sock_sendmsg_nosec+0x13a/0x180 [ 96.118750][ T5633] ____sys_sendmsg+0x54e/0x850 [ 96.123738][ T5633] ? __pfx_____sys_sendmsg+0x10/0x10 [ 96.129081][ T5633] ? import_iovec+0x73/0xa0 [ 96.134586][ T5633] ___sys_sendmsg+0x2a5/0x360 [ 96.139383][ T5633] ? __lock_acquire+0x747/0x2de0 [ 96.144349][ T5633] ? __pfx____sys_sendmsg+0x10/0x10 [ 96.149644][ T5633] __x64_sys_sendmsg+0x1b1/0x290 [ 96.154665][ T5633] ? _raw_spin_unlock_irq+0x2e/0x50 [ 96.160015][ T5633] ? __pfx___x64_sys_sendmsg+0x10/0x10 [ 96.165523][ T5633] do_syscall_64+0x166/0x520 [ 96.170326][ T5633] ? trace_irq_disable+0x3b/0x140 [ 96.175659][ T5633] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 96.181761][ T5633] ? clear_bhb_loop+0x70/0xc0 [ 96.186468][ T5633] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 96.192567][ T5633] RIP: 0033:0x7fcf588a0e79 [ 96.197123][ T5633] Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48 [ 96.217818][ T5633] RSP: 002b:00007ffefb9d7638 EFLAGS: 00000246 ORIG_RAX: 000000000000002e sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=[{nlmsg_len=280, nlmsg_type=0x202 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, "\x07\x00\x00\x07\x68\x00\x01\x80\x06\x00\x03\x40\x00\x04\x00\x00\x2c\x00\x01\x80\x14\x00\x03\x00\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x14\x00\x04\x00\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x0c\x00\x02\x80\x05\x00\x01\x00\xbd\x00\x00\x00\x0c\x00\x02\x80\x05\x00\x01\x00\x21\x00\x00\x00\x0c\x00\x02\x80\x05\x00\x01\x00\x84\x00\x00\x00\x0c\x00\x02\x80"...], iov_len=280}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_EOR}, MSG_EOR|MSG_FASTOPEN) = 280 exit_group(0) = ? +++ exited with 0 +++ [ 96.226363][ T5633] RAX: ffffffffffffffda RBX: 00007ffefb9d7768 RCX: 00007fcf588a0e79 [ 96.234740][ T5633] RDX: 0000000020000080 RSI: 0000200000000300 RDI: 0000000000000004 [ 96.243171][ T5633] RBP: 0000000000000001 R08: 00007ffefb9d7768 R09: 00007ffefb9d7768 [ 96.251263][ T5633] R10: 00007ffefb9d7768 R11: 0000000000000246 R12: 00007ffefb9d7758 [ 96.259397][ T5633] R13: 0000000000000002 R14: 00007fcf58931ca0 R15: 0000000000000002 [ 96.267439][ T5633]