./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3802336091 <...> Warning: Permanently added '10.128.1.70' (ECDSA) to the list of known hosts. execve("./syz-executor3802336091", ["./syz-executor3802336091"], 0x7fff535d3970 /* 10 vars */) = 0 brk(NULL) = 0x555556e08000 brk(0x555556e08c40) = 0x555556e08c40 arch_prctl(ARCH_SET_FS, 0x555556e08300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor3802336091", 4096) = 28 brk(0x555556e29c40) = 0x555556e29c40 brk(0x555556e2a000) = 0x555556e2a000 mprotect(0x7fb044c37000, 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=3638}, "\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=3638}, {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: [ 56.321817][ T3638] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 [ 56.332234][ T3638] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3638, name: syz-executor380 [ 56.342178][ T3638] preempt_count: 1, expected: 0 [ 56.347150][ T3638] RCU nest depth: 0, expected: 0 [ 56.352115][ T3638] 3 locks held by syz-executor380/3638: [ 56.357744][ T3638] #0: ffffffff8df6e4b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 [ 56.366378][ T3638] #1: ffffffff8df6e568 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x51a/0x7e0 [ 56.375527][ T3638] #2: ffff88807ca0d378 (k-clock-AF_INET){+++.}-{2:2}, at: l2tp_tunnel_register+0x126/0x1210 [ 56.385942][ T3638] Preemption disabled at: [ 56.385952][ T3638] [<0000000000000000>] 0x0 [ 56.394811][ T3638] CPU: 1 PID: 3638 Comm: syz-executor380 Not tainted 6.1.0-rc5-syzkaller-01231-g8bd8dcc5e47f #0 [ 56.405261][ T3638] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 56.415337][ T3638] Call Trace: [ 56.418635][ T3638] [ 56.421652][ T3638] dump_stack_lvl+0xd1/0x138 [ 56.426345][ T3638] __might_resched.cold+0x222/0x26b [ 56.431579][ T3638] cpus_read_lock+0x1b/0x140 [ 56.436178][ T3638] static_key_slow_inc+0x12/0x20 [ 56.441121][ T3638] setup_udp_tunnel_sock+0x3e1/0x550 [ 56.446407][ T3638] l2tp_tunnel_register+0xc51/0x1210 [ 56.451723][ T3638] ? l2tp_tunnel_del_work+0x780/0x780 [ 56.457203][ T3638] ? debug_object_free+0x360/0x360 [ 56.462319][ T3638] ? l2tp_recv_common+0x3100/0x3100 [ 56.467530][ T3638] ? l2tp_tunnel_delete+0x50/0x50 [ 56.472568][ T3638] ? l2tp_tunnel_create+0x2bf/0x4b0 [ 56.477860][ T3638] ? l2tp_tunnel_create+0x3c6/0x4b0 [ 56.483229][ T3638] l2tp_nl_cmd_tunnel_create+0x3d6/0x8b0 [ 56.488894][ T3638] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 56.495276][ T3638] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x1b7/0x290 [ 56.502670][ T3638] ? genl_family_rcv_msg_attrs_parse.constprop.0+0xaf/0x290 [ 56.509985][ T3638] genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 [ 56.516344][ T3638] ? genl_start+0x660/0x660 [ 56.520879][ T3638] ? apparmor_capable+0x1dc/0x460 [ 56.526033][ T3638] ? ns_capable+0xdd/0x100 [ 56.530520][ T3638] genl_rcv_msg+0x4ff/0x7e0 [ 56.535133][ T3638] ? genl_family_rcv_msg_doit.isra.0+0x2d0/0x2d0 [ 56.541488][ T3638] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 56.548459][ T3638] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 56.554820][ T3638] netlink_rcv_skb+0x165/0x440 [ 56.559603][ T3638] ? genl_family_rcv_msg_doit.isra.0+0x2d0/0x2d0 [ 56.565988][ T3638] ? netlink_ack+0x1370/0x1370 [ 56.570802][ T3638] ? rwsem_down_read_slowpath+0xb20/0xb20 [ 56.576557][ T3638] ? netlink_deliver_tap+0x1b1/0xc50 [ 56.581869][ T3638] genl_rcv+0x28/0x40 [ 56.585867][ T3638] netlink_unicast+0x547/0x7f0 [ 56.590669][ T3638] ? netlink_attachskb+0x890/0x890 [ 56.595794][ T3638] ? __virt_addr_valid+0x61/0x2e0 [ 56.601048][ T3638] ? __phys_addr_symbol+0x30/0x70 [ 56.606094][ T3638] ? __check_object_size+0x2e2/0x5a0 [ 56.611387][ T3638] netlink_sendmsg+0x91b/0xe10 [ 56.616265][ T3638] ? netlink_unicast+0x7f0/0x7f0 [ 56.621220][ T3638] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 56.627221][ T3638] ? netlink_unicast+0x7f0/0x7f0 [ 56.632169][ T3638] sock_sendmsg+0xd3/0x120 [ 56.636610][ T3638] ____sys_sendmsg+0x712/0x8c0 [ 56.641456][ T3638] ? copy_msghdr_from_user+0xfc/0x150 [ 56.647030][ T3638] ? kernel_sendmsg+0x50/0x50 [ 56.651733][ T3638] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 56.657806][ T3638] ___sys_sendmsg+0x110/0x1b0 [ 56.662476][ T3638] ? do_recvmmsg+0x6e0/0x6e0 [ 56.667096][ T3638] ? lock_release+0x810/0x810 [ 56.671797][ T3638] ? ptrace_stop.part.0+0x49a/0x8c0 [ 56.677114][ T3638] ? do_raw_spin_lock+0x124/0x2b0 [ 56.682126][ T3638] ? rwlock_bug.part.0+0x90/0x90 [ 56.687048][ T3638] ? _raw_spin_lock_irq+0x45/0x50 [ 56.692075][ T3638] ? __fget_light+0x20a/0x270 [ 56.696872][ T3638] __sys_sendmsg+0xf7/0x1c0 [ 56.701388][ T3638] ? __sys_sendmsg_sock+0x40/0x40 [ 56.706512][ T3638] ? lock_downgrade+0x6e0/0x6e0 [ 56.711398][ T3638] ? lockdep_hardirqs_on+0x7d/0x100 [ 56.716616][ T3638] ? _raw_spin_unlock_irq+0x2e/0x50 [ 56.721829][ T3638] ? ptrace_notify+0xfe/0x140 [ 56.726523][ T3638] do_syscall_64+0x39/0xb0 [ 56.731136][ T3638] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 56.737133][ T3638] RIP: 0033:0x7fb044bcaba9 [ 56.741552][ T3638] 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 [ 56.761549][ T3638] RSP: 002b:00007ffc6d5ed608 EFLAGS: 00000246 ORIG_RAX: 000000000000002e 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 +++ [ 56.770584][ T3638] RAX: ffffffffff