./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3515933426 <...> Warning: Permanently added '10.128.1.42' (ECDSA) to the list of known hosts. execve("./syz-executor3515933426", ["./syz-executor3515933426"], 0x7ffd2b897dd0 /* 10 vars */) = 0 brk(NULL) = 0x5555572a3000 brk(0x5555572a3c40) = 0x5555572a3c40 arch_prctl(ARCH_SET_FS, 0x5555572a3300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor3515933426", 4096) = 28 brk(0x5555572c4c40) = 0x5555572c4c40 brk(0x5555572c5000) = 0x5555572c5000 mprotect(0x7f69426cf000, 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 socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) = 3 socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) = 4 sendto(4, [{nlmsg_len=32, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, "\x03\x00\x00\x00\x09\x00\x02\x00\x6c\x32\x74\x70\x00\x00\x00\x00"], 32, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 32 recvfrom(4, [{nlmsg_len=276, nlmsg_type=nlctrl, nlmsg_flags=0, nlmsg_seq=0, nlmsg_pid=3631}, "\x01\x02\x00\x00\x09\x00\x02\x00\x6c\x32\x74\x70\x00\x00\x00\x00\x06\x00\x01\x00\x30\x00\x00\x00\x08\x00\x03\x00\x01\x00\x00\x00\x08\x00\x04\x00\x00\x00\x00\x00\x08\x00\x05\x00\x23\x00\x00\x00\xb8\x00\x06\x00\x14\x00\x01\x00\x08\x00\x01\x00\x00\x00\x00\x00\x08\x00\x02\x00\x0a\x00\x00\x00\x14\x00\x02\x00\x08\x00\x01\x00\x01\x00\x00\x00\x08\x00\x02\x00\x1a\x00\x00\x00\x14\x00\x03\x00\x08\x00\x01\x00"...], 4096, 0, NULL, NULL) = 276 recvfrom(4, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=3631}, {error=0, msg={nlmsg_len=32, nlmsg_type=nlctrl, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36 close(4) = 0 [ 52.199130][ T3631] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 [ 52.209280][ T3631] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3631, name: syz-executor351 [ 52.218828][ T3631] preempt_count: 1, expected: 0 [ 52.223704][ T3631] RCU nest depth: 0, expected: 0 [ 52.228745][ T3631] 3 locks held by syz-executor351/3631: [ 52.234313][ T3631] #0: ffffffff8df6b570 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 [ 52.242637][ T3631] #1: ffffffff8df6b628 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x50d/0x780 [ 52.251692][ T3631] #2: ffff88807dba3db8 (k-clock-AF_INET){+++.}-{2:2}, at: l2tp_tunnel_register+0x126/0x1210 [ 52.262061][ T3631] Preemption disabled at: [ 52.262072][ T3631] [<0000000000000000>] 0x0 [ 52.270824][ T3631] CPU: 0 PID: 3631 Comm: syz-executor351 Not tainted 6.1.0-rc5-syzkaller-00307-gfe24a97cf254 #0 [ 52.281235][ T3631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 52.291281][ T3631] Call Trace: [ 52.294556][ T3631] [ 52.297490][ T3631] dump_stack_lvl+0xd1/0x138 [ 52.302077][ T3631] __might_resched.cold+0x222/0x26b [ 52.307452][ T3631] cpus_read_lock+0x1b/0x140 [ 52.312035][ T3631] static_key_slow_inc+0x12/0x20 [ 52.316980][ T3631] setup_udp_tunnel_sock+0x3e1/0x550 [ 52.322257][ T3631] l2tp_tunnel_register+0xc51/0x1210 [ 52.327542][ T3631] ? l2tp_tunnel_del_work+0x780/0x780 [ 52.332915][ T3631] ? debug_object_free+0x360/0x360 [ 52.338028][ T3631] ? l2tp_recv_common+0x3100/0x3100 [ 52.343221][ T3631] ? l2tp_tunnel_delete+0x50/0x50 [ 52.348244][ T3631] ? l2tp_tunnel_create+0x2bf/0x4b0 [ 52.353526][ T3631] ? l2tp_tunnel_create+0x3c6/0x4b0 [ 52.358725][ T3631] l2tp_nl_cmd_tunnel_create+0x3d6/0x8b0 [ 52.364365][ T3631] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 52.370632][ T3631] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x1b7/0x290 [ 52.377996][ T3631] ? genl_family_rcv_msg_attrs_parse.constprop.0+0xaf/0x290 [ 52.385277][ T3631] genl_family_rcv_msg_doit+0x228/0x320 [ 52.390824][ T3631] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x290/0x290 [ 52.398209][ T3631] ? ns_capable+0xdd/0x100 [ 52.402625][ T3631] genl_rcv_msg+0x445/0x780 [ 52.407126][ T3631] ? genl_start+0x670/0x670 [ 52.411622][ T3631] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 52.417951][ T3631] ? lock_release+0x810/0x810 [ 52.422645][ T3631] netlink_rcv_skb+0x157/0x430 [ 52.427689][ T3631] ? genl_start+0x670/0x670 [ 52.432298][ T3631] ? netlink_ack+0xd60/0xd60 [ 52.436886][ T3631] ? netlink_deliver_tap+0x1b1/0xc50 [ 52.442166][ T3631] genl_rcv+0x28/0x40 [ 52.446140][ T3631] netlink_unicast+0x547/0x7f0 [ 52.450904][ T3631] ? netlink_attachskb+0x890/0x890 [ 52.456006][ T3631] ? __virt_addr_valid+0x61/0x2e0 [ 52.461030][ T3631] ? __phys_addr_symbol+0x30/0x70 [ 52.466050][ T3631] ? __check_object_size+0x2e2/0x5a0 [ 52.471341][ T3631] netlink_sendmsg+0x91b/0xe10 [ 52.476102][ T3631] ? netlink_unicast+0x7f0/0x7f0 [ 52.481035][ T3631] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 52.486323][ T3631] ? netlink_unicast+0x7f0/0x7f0 [ 52.491258][ T3631] sock_sendmsg+0xd3/0x120 [ 52.495678][ T3631] ____sys_sendmsg+0x712/0x8c0 [ 52.500442][ T3631] ? copy_msghdr_from_user+0xfc/0x150 [ 52.505806][ T3631] ? kernel_sendmsg+0x50/0x50 [ 52.510489][ T3631] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 52.516481][ T3631] ___sys_sendmsg+0x110/0x1b0 [ 52.521158][ T3631] ? do_recvmmsg+0x6e0/0x6e0 [ 52.525751][ T3631] ? lock_release+0x810/0x810 [ 52.530431][ T3631] ? ptrace_stop.part.0+0x49a/0x8c0 [ 52.535643][ T3631] ? do_raw_spin_lock+0x124/0x2b0 [ 52.540668][ T3631] ? rwlock_bug.part.0+0x90/0x90 [ 52.545602][ T3631] ? _raw_spin_lock_irq+0x45/0x50 [ 52.550633][ T3631] ? __fget_light+0x20a/0x270 [ 52.555313][ T3631] __sys_sendmsg+0xf7/0x1c0 [ 52.559811][ T3631] ? __sys_sendmsg_sock+0x40/0x40 [ 52.564828][ T3631] ? lock_downgrade+0x6e0/0x6e0 [ 52.569687][ T3631] ? lockdep_hardirqs_on+0x7d/0x100 [ 52.574882][ T3631] ? _raw_spin_unlock_irq+0x2e/0x50 [ 52.580255][ T3631] ? ptrace_notify+0xfe/0x140 [ 52.584941][ T3631] do_syscall_64+0x39/0xb0 [ 52.589358][ T3631] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 52.595259][ T3631] RIP: 0033:0x7f6942662ba9 [ 52.599671][ T3631] Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 52.619542][ T3631] RSP: 002b:00007ffcdd671258 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 52.627957][ T3631] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6942662ba9 [ 52.635917][ T3631] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x3c\x00\x00\x00\x30\x00\x23\x09\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x05\x00\x07\x00\x00\x00\x00\x00\x08\x00\x09\x00\x00\x00\x00\x00\x06\x00\x02\x00\x00\x00\x00\x00\x08\x00\x0a\x00\x00\x00\x00\x00\x08\x00\x17\x00\xff\xff\xff\xff", iov_len=60}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 60 exit_group(0) = ? +++ exited with 0 +++ [ 52.643876][ T3631] RBP: 00007f6942626570 R08: 0000000000000006 R09: 0000000000000