./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3024173331 <...> Warning: Permanently added '10.128.0.97' (ECDSA) to the list of known hosts. execve("./syz-executor3024173331", ["./syz-executor3024173331"], 0x7ffebe46f010 /* 10 vars */) = 0 brk(NULL) = 0x555556f4f000 brk(0x555556f4fc40) = 0x555556f4fc40 arch_prctl(ARCH_SET_FS, 0x555556f4f300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor3024173331", 4096) = 28 brk(0x555556f70c40) = 0x555556f70c40 brk(0x555556f71000) = 0x555556f71000 mprotect(0x7ffb82a57000, 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=3637}, "\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=3637}, {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 syzkaller login: [ 52.061748][ T3637] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 [ 52.071714][ T3637] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3637, name: syz-executor302 [ 52.081205][ T3637] preempt_count: 1, expected: 0 [ 52.086040][ T3637] RCU nest depth: 0, expected: 0 [ 52.091018][ T3637] 3 locks held by syz-executor302/3637: [ 52.096572][ T3637] #0: ffffffff8df6b4f0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 [ 52.104824][ T3637] #1: ffffffff8df6b5a8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x50d/0x780 [ 52.113862][ T3637] #2: ffff8880186b1978 (k-clock-AF_INET){+++.}-{2:2}, at: l2tp_tunnel_register+0x126/0x1210 [ 52.124099][ T3637] Preemption disabled at: [ 52.124111][ T3637] [<0000000000000000>] 0x0 [ 52.132897][ T3637] CPU: 0 PID: 3637 Comm: syz-executor302 Not tainted 6.1.0-rc5-syzkaller-00105-g11b64a466c95 #0 [ 52.143306][ T3637] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 52.153370][ T3637] Call Trace: [ 52.156653][ T3637] [ 52.159593][ T3637] dump_stack_lvl+0xd1/0x138 [ 52.164210][ T3637] __might_resched.cold+0x222/0x26b [ 52.169434][ T3637] cpus_read_lock+0x1b/0x140 [ 52.174055][ T3637] static_key_slow_inc+0x12/0x20 [ 52.179011][ T3637] setup_udp_tunnel_sock+0x3e1/0x550 [ 52.184322][ T3637] l2tp_tunnel_register+0xc51/0x1210 [ 52.189644][ T3637] ? l2tp_tunnel_del_work+0x780/0x780 [ 52.195043][ T3637] ? debug_object_free+0x360/0x360 [ 52.200191][ T3637] ? l2tp_recv_common+0x3100/0x3100 [ 52.205416][ T3637] ? l2tp_tunnel_delete+0x50/0x50 [ 52.210467][ T3637] ? l2tp_tunnel_create+0x2bf/0x4b0 [ 52.215686][ T3637] ? l2tp_tunnel_create+0x3c6/0x4b0 [ 52.220913][ T3637] l2tp_nl_cmd_tunnel_create+0x3d6/0x8b0 [ 52.226579][ T3637] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 52.232861][ T3637] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x1b7/0x290 [ 52.240253][ T3637] ? genl_family_rcv_msg_attrs_parse.constprop.0+0xaf/0x290 [ 52.247562][ T3637] genl_family_rcv_msg_doit+0x228/0x320 [ 52.253129][ T3637] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x290/0x290 [ 52.260558][ T3637] ? ns_capable+0xdd/0x100 [ 52.265009][ T3637] genl_rcv_msg+0x445/0x780 [ 52.269541][ T3637] ? genl_start+0x670/0x670 [ 52.274066][ T3637] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 52.280357][ T3637] ? lock_release+0x810/0x810 [ 52.285074][ T3637] netlink_rcv_skb+0x157/0x430 [ 52.289864][ T3637] ? genl_start+0x670/0x670 [ 52.294391][ T3637] ? netlink_ack+0xd60/0xd60 [ 52.299003][ T3637] ? netlink_deliver_tap+0x1b1/0xc50 [ 52.304309][ T3637] genl_rcv+0x28/0x40 [ 52.308306][ T3637] netlink_unicast+0x547/0x7f0 [ 52.313100][ T3637] ? netlink_attachskb+0x890/0x890 [ 52.318226][ T3637] ? __virt_addr_valid+0x61/0x2e0 [ 52.323275][ T3637] ? __phys_addr_symbol+0x30/0x70 [ 52.328324][ T3637] ? __check_object_size+0x2e2/0x5a0 [ 52.333642][ T3637] netlink_sendmsg+0x91b/0xe10 [ 52.338430][ T3637] ? netlink_unicast+0x7f0/0x7f0 [ 52.343389][ T3637] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 52.348704][ T3637] ? netlink_unicast+0x7f0/0x7f0 [ 52.353832][ T3637] sock_sendmsg+0xd3/0x120 [ 52.358363][ T3637] ____sys_sendmsg+0x712/0x8c0 [ 52.363154][ T3637] ? copy_msghdr_from_user+0xfc/0x150 [ 52.368541][ T3637] ? kernel_sendmsg+0x50/0x50 [ 52.373255][ T3637] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 52.379270][ T3637] ___sys_sendmsg+0x110/0x1b0 [ 52.383965][ T3637] ? do_recvmmsg+0x6e0/0x6e0 [ 52.388591][ T3637] ? lock_release+0x810/0x810 [ 52.393295][ T3637] ? ptrace_stop.part.0+0x49a/0x8c0 [ 52.398526][ T3637] ? do_raw_spin_lock+0x124/0x2b0 [ 52.403565][ T3637] ? rwlock_bug.part.0+0x90/0x90 [ 52.408514][ T3637] ? _raw_spin_lock_irq+0x45/0x50 [ 52.413579][ T3637] ? __fget_light+0x20a/0x270 [ 52.418280][ T3637] __sys_sendmsg+0xf7/0x1c0 [ 52.422804][ T3637] ? __sys_sendmsg_sock+0x40/0x40 [ 52.427844][ T3637] ? lock_downgrade+0x6e0/0x6e0 [ 52.432732][ T3637] ? lockdep_hardirqs_on+0x7d/0x100 [ 52.437948][ T3637] ? _raw_spin_unlock_irq+0x2e/0x50 [ 52.443167][ T3637] ? ptrace_notify+0xfe/0x140 [ 52.447906][ T3637] do_syscall_64+0x39/0xb0 [ 52.452376][ T3637] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 52.458314][ T3637] RIP: 0033:0x7ffb829eaba9 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 +++ [ 52.462747