./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1673487928 <...> DUID 00:04:b8:64:54:4b:51:f9:b6:ea:77:bd:45:d1:95:a6:31:4f forked to background, child pid 3209 [ 32.939659][ T3210] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.965856][ T3210] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. execve("./syz-executor1673487928", ["./syz-executor1673487928"], 0x7fff9c7f3e60 /* 10 vars */) = 0 brk(NULL) = 0x555555d29000 brk(0x555555d29c40) = 0x555555d29c40 arch_prctl(ARCH_SET_FS, 0x555555d29300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor1673487928", 4096) = 28 brk(0x555555d4ac40) = 0x555555d4ac40 brk(0x555555d4b000) = 0x555555d4b000 mprotect(0x7f93d15d4000, 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 openat(AT_FDCWD, "cgroup.controllers", O_RDWR|O_CREAT|O_NOCTTY|O_TRUNC|O_APPEND|FASYNC|0x18, 000) = 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=3634}, "\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=3634}, {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 sendmsg(-1, {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) = -1 EBADF (Bad file descriptor) write(3, "\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\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 34136651) = 16777152 mmap(0x20000000, 11755520, PROT_READ|PROT_WRITE|PROT_GROWSUP, MAP_SHARED|MAP_FIXED|MAP_POPULATE|MAP_STACK, 3, 0) = 0x20000000 openat(AT_FDCWD, "cgroup.controllers", O_RDONLY|O_NONBLOCK|O_DSYNC|O_DIRECT|O_NOFOLLOW|O_NOATIME|0x8) = 4 socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) = 5 syzkaller login: [ 52.782593][ T27] audit: type=1804 audit(1668686577.423:2): pid=3634 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=invalid_pcr cause=open_writers comm="syz-executor167" name="/root/cgroup.controllers" dev="sda1" ino=1138 res=1 errno=0 [ 52.792563][ T3634] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 [ 52.814504][ T3634] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3634, name: syz-executor167 [ 52.824036][ T3634] preempt_count: 1, expected: 0 [ 52.828946][ T3634] RCU nest depth: 0, expected: 0 [ 52.833898][ T3634] 3 locks held by syz-executor167/3634: [ 52.839519][ T3634] #0: ffffffff8df6b530 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 [ 52.847809][ T3634] #1: ffffffff8df6b5e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x50d/0x780 [ 52.856825][ T3634] #2: ffff8880182fa0b8 (k-clock-AF_INET){+++.}-{2:2}, at: l2tp_tunnel_register+0x126/0x1210 [ 52.867093][ T3634] Preemption disabled at: [ 52.867101][ T3634] [<0000000000000000>] 0x0 [ 52.875812][ T3634] CPU: 1 PID: 3634 Comm: syz-executor167 Not tainted 6.1.0-rc4-syzkaller-00212-g064bc7312bd0 #0 [ 52.886213][ T3634] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 52.896255][ T3634] Call Trace: [ 52.899525][ T3634] [ 52.902447][ T3634] dump_stack_lvl+0xd1/0x138 [ 52.907036][ T3634] __might_resched.cold+0x222/0x26b [ 52.912231][ T3634] cpus_read_lock+0x1b/0x140 [ 52.916816][ T3634] static_key_slow_inc+0x12/0x20 [ 52.921752][ T3634] setup_udp_tunnel_sock+0x3e1/0x550 [ 52.927037][ T3634] l2tp_tunnel_register+0xc51/0x1210 [ 52.932328][ T3634] ? l2tp_tunnel_del_work+0x780/0x780 [ 52.937698][ T3634] ? debug_object_free+0x360/0x360 [ 52.942807][ T3634] ? l2tp_recv_common+0x3100/0x3100 [ 52.948002][ T3634] ? l2tp_tunnel_delete+0x50/0x50 [ 52.953026][ T3634] ? l2tp_tunnel_create+0x2bf/0x4b0 [ 52.958216][ T3634] ? l2tp_tunnel_create+0x3c6/0x4b0 [ 52.963411][ T3634] l2tp_nl_cmd_tunnel_create+0x3d6/0x8b0 [ 52.969048][ T3634] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 52.975294][ T3634] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x1b7/0x290 [ 52.982664][ T3634] ? genl_family_rcv_msg_attrs_parse.constprop.0+0xaf/0x290 [ 52.989977][ T3634] genl_family_rcv_msg_doit+0x228/0x320 [ 52.995543][ T3634] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x290/0x290 [ 53.002949][ T3634] ? ns_capable+0xdd/0x100 [ 53.007394][ T3634] genl_rcv_msg+0x445/0x780 [ 53.011928][ T3634] ? genl_start+0x670/0x670 [ 53.016446][ T3634] ? l2tp_tunnel_notify.constprop.0+0x160/0x160 [ 53.022724][ T3634] ? lock_release+0x810/0x810 [ 53.027437][ T3634] netlink_rcv_skb+0x157/0x430 [ 53.032216][ T3634] ? genl_start+0x670/0x670 [ 53.036737][ T3634] ? netlink_ack+0xd60/0xd60 [ 53.041352][ T3634] ? netlink_deliver_tap+0x1b1/0xc50 [ 53.046658][ T3634] genl_rcv+0x28/0x40 [ 53.050655][ T3634] netlink_unicast+0x547/0x7f0 [ 53.055438][ T3634] ? netlink_attachskb+0x890/0x890 [ 53.060565][ T3634] ? find_vmap_area+0xf8/0x130 [ 53.065349][ T3634] ? __phys_addr_symbol+0x30/0x70 [ 53.070398][ T3634] ? __check_object_size+0x2e2/0x5a0 [ 53.075717][ T3634] netlink_sendmsg+0x91b/0xe10 [ 53.080502][ T3634] ? netlink_unicast+0x7f0/0x7f0 [ 53.085452][ T3634] ? __x64_sys_sendfile64+0x1d0/0x210 [ 53.090857][ T3634] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 53.096169][ T3634] ? netlink_unicast+0x7f0/0x7f0 [ 53.101122][ T3634] sock_sendmsg+0xd3/0x120 [ 53.105569][ T3634] sock_no_sendpage+0x10c/0x160 [ 53.110444][ T3634] ? sock_kzfree_s+0x60/0x60 [ 53.115054][ T3634] ? mark_held_locks+0x9f/0xe0 [ 53.119868][ T3634] ? kasan_quarantine_put+0xf9/0x220 [ 53.125196][ T3634] ? lockdep_hardirqs_on+0x7d/0x100 [ 53.130415][ T3634] kernel_sendpage.part.0+0x1d5/0x700 [ 53.135821][ T3634] sock_sendpage+0xe3/0x140 [ 53.140357][ T3634] ? kernel_sendpage+0xd0/0xd0 [ 53.145145][ T3634] pipe_to_sendpage+0x2b1/0x380 [ 53.150020][ T3634] ? propagate_umount+0x19f0/0x19f0 [ 53.155236][ T3634] ? splice_from_pipe_next.part.0+0x167/0x520 [ 53.161332][ T3634] __splice_from_pipe+0x449/0x8a0 [ 53.166385][ T3634] ? propagate_umount+0x19f0/0x19f0 [ 53.171607][ T3634] generic_splice_sendpage+0xd8/0x140 [ 53.176999][ T3634] ? __do_sys_vmsplice+0xa90/0xa90 [ 53.182143][ T3634] ? security_file_permission+0xaf/0xd0 [ 53.187720][ T3634] ? __do_sys_vmsplice+0xa90/0xa90 [ 53.192854][ T3634] direct_splice_actor+0x114/0x180 [ 53.197992][ T3634] splice_direct_to_actor+0x335/0x8a0 [ 53.203386][ T3634] ? do_splice_direct+0x280/0x280 [ 53.208438][ T3634] ? folio_flags.constprop.0+0x150/0x150 [ 53.214089][ T3634] ? bpf_lsm_file_permission+0x9/0x10 [ 53.219473][ T3634] ? security_file_permission+0xaf/0xd0 [ 53.225055][ T3634] do_splice_direct+0x1ab/0x280 [ 53.229924][ T3634] ? splice_direct_to_actor+0x8a0/0x8a0 [ 53.235496][ T3634] ? bpf_lsm_file_permission+0x9/0x10 [ 53.240883][ T3634] ? security_file_permission+0xaf/0xd0 [ 53.246462][ T3634] do_sendfile+0xb19/0x1270 [ 53.250995][ T3634] ? vfs_iocb_iter_write+0x480/0x480 [ 53.256300][ T3634] ? ptrace_notify+0xfe/0x140 [ 53.261005][ T3634] ? lock_downgrade+0x6e0/0x6e0 [ 53.265895][ T3634] __x64_sys_sendfile64+0x1d0/0x210 [ 53.271114][ T3634] ? _raw_spin_unlock_irq+0x23/0x50 [ 53.276334][ T3634] ? __ia32_sys_sendfile+0x220/0x220 [ 53.281641][ T3634] ? lockdep_hardirqs_on+0x7d/0x100 [ 53.286853][ T3634] ? _raw_spin_unlock_irq+0x2e/0x50 [ 53.292073][ T3634] ? ptrace_notify+0xfe/0x140 [ 53.296784][ T3634] do_syscall_64+0x39/0xb0 [ 53.301226][ T3634] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 53.307141][ T3634] RIP: 0033:0x7f93d1567cb9 [ 53.311568][ T3634] 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 [ 53.331187][ T3634] RSP: 002b:00007ffdd8ae4a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 53.339613][ T3634] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f93d1567cb9 [ 53.347597][ T3634] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005 [ 53.355575][ T3634] RBP: 00007f93d152b680 R08: 0000000000000000 R09: 0000000000000000 [ 53.363554][ T3634] R10: 0000000100000000 R11: 0000000000000246 R12: 00007f93d152b710 [ 53.371533][ T3634] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 53.379534][ T3634] sendfile(5, 4, NULL, 4294967296) = 16777152 exit_group(0) = ? +++ exited with 0 +++