./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4075856211 <...> forked to background, child pid 3207 no interfaces have a carrier [ 27.354222][ T3208] 8021q: adding VLAN 0 to HW filter on device bond0 [ 27.367925][ T3208] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.75' (ECDSA) to the list of known hosts. execve("./syz-executor4075856211", ["./syz-executor4075856211"], 0x7fff0009e210 /* 10 vars */) = 0 brk(NULL) = 0x555556ecb000 brk(0x555556ecbc40) = 0x555556ecbc40 arch_prctl(ARCH_SET_FS, 0x555556ecb300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor4075856211", 4096) = 28 brk(0x555556eecc40) = 0x555556eecc40 brk(0x555556eed000) = 0x555556eed000 mprotect(0x7fd478da4000, 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=3629}, "\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=3629}, {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: [ 51.356862][ T3629] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 [ 51.367237][ T3629] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3629, name: syz-executor407 [ 51.376738][ T3629] preempt_count: 1, expected: 0 [ 51.381673][ T3629] RCU nest depth: 0, expected: 0 [ 51.386634][ T3629] 3 locks held by syz-executor407/3629: [ 51.392187][ T3629] #0: ffffffff8df6b4f0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 [ 51.400432][ T3629] #1: ffffffff8df6b5a8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x50d/0x780 [ 51.409462][ T3629] #2: ffff888076fcbdb8 (k-clock-AF_INET){+++.}-{2:2}, at: l2tp_tunnel_register+0x126/0x1210 [ 51.419716][ T3629] Preemption disabled at: [ 51.419725][ T3629] [<0000000000000000>] 0x0 [ 51.428576][ T3629] CPU: 0 PID: 3629 Comm: syz-executor407 Not tainted 6.1.0-rc5-syzkaller-00103-g81ac25651a62 #0 [ 51.438981][ T3629] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 51.449032][ T3629] Call Trace: [ 51.452303][ T3629] [ 51.455229][ T3629] dump_stack_lvl+0xd1/0x138 [ 51.459823][ T3629] __might_resched.cold+0x222/0x26b [ 51.465024][ T3629] cpus_read_lock+0x1b/0x140 [ 51.469615][ T3629] static_key_slow_inc+0x12/0x20 [ 51.475076][ T3629] setup_udp_tunnel_sock+0x3e1/0x550 [ 51.480381][ T3629] l2tp_tunnel_register+0xc51/0x1210 [ 51.485673][ T3629] ? l2tp_tunnel_del_work+0x780/0x780 [ 51.491056][ T3629] ? debug_object_free+0x360/0x360 [ 51.496189][ T3629] ? l2tp_recv_common+0x3100/0x3100 [ 51.501560][ T3629] ? l2tp_tunnel_delete+0x50/0x50 [ 51.506848][ T3629] ? l2tp_tunnel_create+0x2bf/0x4b0 [ 51.512042][ T3629] ? l2tp_tunnel_create+0x3c6/0x4b0 [ 51.517242][ T3629] l2tp_nl_cmd_tunnel_create+0x3d6/0x8b0 [ 51.523142][ T3629] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 51.529395][ T3629] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x1b7/0x290 [ 51.536765][ T3629] ? genl_family_rcv_msg_attrs_parse.constprop.0+0xaf/0x290 [ 51.544055][ T3629] genl_family_rcv_msg_doit+0x228/0x320 [ 51.549603][ T3629] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x290/0x290 [ 51.556981][ T3629] ? ns_capable+0xdd/0x100 [ 51.561485][ T3629] genl_rcv_msg+0x445/0x780 [ 51.565986][ T3629] ? genl_start+0x670/0x670 [ 51.570483][ T3629] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 51.576806][ T3629] ? lock_release+0x810/0x810 [ 51.581496][ T3629] netlink_rcv_skb+0x157/0x430 [ 51.586259][ T3629] ? genl_start+0x670/0x670 [ 51.590762][ T3629] ? netlink_ack+0xd60/0xd60 [ 51.595448][ T3629] ? netlink_deliver_tap+0x1b1/0xc50 [ 51.600764][ T3629] genl_rcv+0x28/0x40 [ 51.604762][ T3629] netlink_unicast+0x547/0x7f0 [ 51.609536][ T3629] ? netlink_attachskb+0x890/0x890 [ 51.614649][ T3629] ? __virt_addr_valid+0x61/0x2e0 [ 51.619683][ T3629] ? __phys_addr_symbol+0x30/0x70 [ 51.624729][ T3629] ? __check_object_size+0x2e2/0x5a0 [ 51.630025][ T3629] netlink_sendmsg+0x91b/0xe10 [ 51.634800][ T3629] ? netlink_unicast+0x7f0/0x7f0 [ 51.639744][ T3629] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 51.645057][ T3629] ? netlink_unicast+0x7f0/0x7f0 [ 51.649992][ T3629] sock_sendmsg+0xd3/0x120 [ 51.654414][ T3629] ____sys_sendmsg+0x712/0x8c0 [ 51.659186][ T3629] ? copy_msghdr_from_user+0xfc/0x150 [ 51.664557][ T3629] ? kernel_sendmsg+0x50/0x50 [ 51.669609][ T3629] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 51.675602][ T3629] ___sys_sendmsg+0x110/0x1b0 [ 51.680280][ T3629] ? do_recvmmsg+0x6e0/0x6e0 [ 51.684901][ T3629] ? lock_release+0x810/0x810 [ 51.689599][ T3629] ? ptrace_stop.part.0+0x49a/0x8c0 [ 51.694811][ T3629] ? do_raw_spin_lock+0x124/0x2b0 [ 51.699844][ T3629] ? rwlock_bug.part.0+0x90/0x90 [ 51.704787][ T3629] ? _raw_spin_lock_irq+0x45/0x50 [ 51.709821][ T3629] ? __fget_light+0x20a/0x270 [ 51.714503][ T3629] __sys_sendmsg+0xf7/0x1c0 [ 51.719003][ T3629] ? __sys_sendmsg_sock+0x40/0x40 [ 51.724024][ T3629] ? lock_downgrade+0x6e0/0x6e0 [ 51.728886][ T3629] ? lockdep_hardirqs_on+0x7d/0x100 [ 51.734085][ T3629] ? _raw_spin_unlock_irq+0x2e/0x50 [ 51.739283][ T3629] ? ptrace_notify+0xfe/0x140 [ 51.743965][ T3629] do_syscall_64+0x39/0xb0 [ 51.748385][ T3629] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 51.754277][ T3629] RIP: 0033:0x7fd478d37ba9 [ 51.758682][ T3629] 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 [ 51.778300][ T3629] RSP: 002b:00007ffe4d846168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 51.786716][ T3629] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd478d37ba9 [ 51.794684][ T3629] 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 +++ [ 51.802651][ T3629] RBP: 00007fd478cfb570 R08: 0000000000000006 R09