./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4257740346 <...> DUID 00:04:ce:8e:a7:1a:d5:92:ad:c3:fd:35:80:c9:2b:13:ab:38 forked to background, child pid 3203 [ 50.254828][ T3204] 8021q: adding VLAN 0 to HW filter on device bond0 [ 50.279885][ T3204] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. execve("./syz-executor4257740346", ["./syz-executor4257740346"], 0x7ffec7b17370 /* 10 vars */) = 0 brk(NULL) = 0x555556579000 brk(0x555556579c40) = 0x555556579c40 arch_prctl(ARCH_SET_FS, 0x555556579300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor4257740346", 4096) = 28 brk(0x55555659ac40) = 0x55555659ac40 brk(0x55555659b000) = 0x55555659b000 mprotect(0x7fbf601e3000, 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=3627}, "\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=3627}, {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: [ 77.783677][ T3627] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 [ 77.793850][ T3627] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3627, name: syz-executor425 [ 77.803452][ T3627] preempt_count: 1, expected: 0 [ 77.808354][ T3627] RCU nest depth: 0, expected: 0 [ 77.813303][ T3627] 3 locks held by syz-executor425/3627: [ 77.818949][ T3627] #0: ffffffff8df53370 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 [ 77.827310][ T3627] #1: ffffffff8df53428 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x51a/0x7e0 [ 77.836500][ T3627] #2: ffff888018610af8 (k-clock-AF_INET){+++.}-{2:2}, at: l2tp_tunnel_register+0x126/0x1210 [ 77.846948][ T3627] Preemption disabled at: [ 77.846962][ T3627] [<0000000000000000>] 0x0 [ 77.855795][ T3627] CPU: 1 PID: 3627 Comm: syz-executor425 Not tainted 6.1.0-rc5-syzkaller-01316-g170d97739de4 #0 [ 77.866248][ T3627] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 77.876326][ T3627] Call Trace: [ 77.879629][ T3627] [ 77.882576][ T3627] dump_stack_lvl+0xd1/0x138 [ 77.887204][ T3627] __might_resched.cold+0x222/0x26b [ 77.892435][ T3627] cpus_read_lock+0x1b/0x140 [ 77.897052][ T3627] static_key_slow_inc+0x12/0x20 [ 77.902027][ T3627] setup_udp_tunnel_sock+0x3e1/0x550 [ 77.907345][ T3627] l2tp_tunnel_register+0xc51/0x1210 [ 77.912652][ T3627] ? l2tp_tunnel_del_work+0x780/0x780 [ 77.918129][ T3627] ? debug_object_free+0x360/0x360 [ 77.923266][ T3627] ? l2tp_recv_common+0x3100/0x3100 [ 77.928482][ T3627] ? l2tp_tunnel_delete+0x50/0x50 [ 77.933542][ T3627] ? l2tp_tunnel_create+0x2bf/0x4b0 [ 77.938787][ T3627] ? l2tp_tunnel_create+0x3c6/0x4b0 [ 77.944019][ T3627] l2tp_nl_cmd_tunnel_create+0x3d6/0x8b0 [ 77.949689][ T3627] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 77.955962][ T3627] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x1b7/0x290 [ 77.963361][ T3627] ? genl_family_rcv_msg_attrs_parse.constprop.0+0xaf/0x290 [ 77.970696][ T3627] genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 [ 77.976929][ T3627] ? genl_start+0x660/0x660 [ 77.981451][ T3627] ? apparmor_capable+0x1dc/0x460 [ 77.986520][ T3627] ? ns_capable+0xdd/0x100 [ 77.990963][ T3627] genl_rcv_msg+0x4ff/0x7e0 [ 77.995491][ T3627] ? genl_family_rcv_msg_doit.isra.0+0x2d0/0x2d0 [ 78.001842][ T3627] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 78.007863][ T3627] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 78.014144][ T3627] netlink_rcv_skb+0x165/0x440 [ 78.018930][ T3627] ? genl_family_rcv_msg_doit.isra.0+0x2d0/0x2d0 [ 78.025282][ T3627] ? netlink_ack+0x1370/0x1370 [ 78.030097][ T3627] ? rwsem_down_read_slowpath+0xb20/0xb20 [ 78.035844][ T3627] ? netlink_deliver_tap+0x1b1/0xc50 [ 78.041155][ T3627] genl_rcv+0x28/0x40 [ 78.045191][ T3627] netlink_unicast+0x547/0x7f0 [ 78.049983][ T3627] ? netlink_attachskb+0x890/0x890 [ 78.055111][ T3627] ? __virt_addr_valid+0x61/0x2e0 [ 78.060187][ T3627] ? __phys_addr_symbol+0x30/0x70 [ 78.065279][ T3627] ? __check_object_size+0x2e2/0x5a0 [ 78.070628][ T3627] netlink_sendmsg+0x91b/0xe10 [ 78.075439][ T3627] ? netlink_unicast+0x7f0/0x7f0 [ 78.080418][ T3627] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 78.085839][ T3627] ? netlink_unicast+0x7f0/0x7f0 [ 78.091181][ T3627] sock_sendmsg+0xd3/0x120 [ 78.095670][ T3627] ____sys_sendmsg+0x712/0x8c0 [ 78.100494][ T3627] ? copy_msghdr_from_user+0xfc/0x150 [ 78.105902][ T3627] ? kernel_sendmsg+0x50/0x50 [ 78.110738][ T3627] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 78.116792][ T3627] ___sys_sendmsg+0x110/0x1b0 [ 78.121524][ T3627] ? do_recvmmsg+0x6e0/0x6e0 [ 78.126255][ T3627] ? lock_release+0x810/0x810 [ 78.131098][ T3627] ? ptrace_stop.part.0+0x49a/0x8c0 [ 78.136357][ T3627] ? do_raw_spin_lock+0x124/0x2b0 [ 78.141408][ T3627] ? rwlock_bug.part.0+0x90/0x90 [ 78.146370][ T3627] ? _raw_spin_lock_irq+0x45/0x50 [ 78.151442][ T3627] ? __fget_light+0x20a/0x270 [ 78.156166][ T3627] __sys_sendmsg+0xf7/0x1c0 [ 78.160718][ T3627] ? __sys_sendmsg_sock+0x40/0x40 [ 78.165783][ T3627] ? lock_downgrade+0x6e0/0x6e0 [ 78.170712][ T3627] ? lockdep_hardirqs_on+0x7d/0x100 [ 78.176644][ T3627] ? _raw_spin_unlock_irq+0x2e/0x50 [ 78.181884][ T3627] ? ptrace_notify+0xfe/0x140 [ 78.186588][ T3627] do_syscall_64+0x39/0xb0 [ 78.191041][ T3627] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 78.196981][ T3627] RIP: 0033:0x7fbf60176ba9 [ 78.201507][ T3627] 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 [ 78.221145][ T3627] RSP: 002b:00007fff92fd0b78 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 +++ [ 78.229589][ T3627] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: