[....] Starting enhanced syslogd: rsyslogd[ 13.608558] audit: type=1400 audit(1516048662.865:5): avc: denied { syslog } for pid=3506 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.538881] audit: type=1400 audit(1516048667.795:6): avc: denied { map } for pid=3645 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.15.204' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 24.759093] audit: type=1400 audit(1516048674.015:7): avc: denied { map } for pid=3659 comm="syzkaller828695" path="/root/syzkaller828695111" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 25.161916] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 25.519948] skbuff: skb_under_panic: text:00000000298358d4 len:31 put:24 head:00000000dcaba87f data:000000005b0b33a6 tail:0x7 end:0xc0 dev:gre0 [ 25.533140] ------------[ cut here ]------------ [ 25.537872] kernel BUG at net/core/skbuff.c:104! [ 25.542826] invalid opcode: 0000 [#1] SMP KASAN [ 25.547483] Dumping ftrace buffer: [ 25.551021] (ftrace buffer empty) [ 25.554704] Modules linked in: [ 25.557870] CPU: 0 PID: 3659 Comm: syzkaller828695 Not tainted 4.15.0-rc8+ #173 [ 25.565288] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.574620] RIP: 0010:skb_panic+0x162/0x1f0 [ 25.578910] RSP: 0018:ffff8801d9a976b0 EFLAGS: 00010282 [ 25.584242] RAX: 0000000000000083 RBX: ffff8801d521c500 RCX: 0000000000000000 [ 25.591484] RDX: 0000000000000083 RSI: 1ffff1003b352e96 RDI: ffffed003b352eca [ 25.598729] RBP: ffff8801d9a97718 R08: 1ffff1003b352e58 R09: 0000000000000000 [ 25.606058] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff861f8fe0 [ 25.613301] R13: ffffffff84a31e3d R14: 0000000000000018 R15: ffff8801d31d80c0 [ 25.620546] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008e2d840 [ 25.628763] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 25.634644] CR2: 00000000208bc000 CR3: 00000001d95e2003 CR4: 00000000001606f0 [ 25.641902] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.649148] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.656398] Call Trace: [ 25.658962] ? check_stack_object+0x140/0x140 [ 25.663431] ? ipgre_header+0x6d/0x4e0 [ 25.667294] skb_push+0xce/0xf0 [ 25.670548] ipgre_header+0x6d/0x4e0 [ 25.674240] pppoe_sendmsg+0x58e/0x8b0 [ 25.678102] ? gretap_fb_dev_create+0x250/0x250 [ 25.682746] ? pppoe_getname+0x210/0x210 [ 25.686783] ? selinux_socket_sendmsg+0x36/0x40 [ 25.691424] ? security_socket_sendmsg+0x89/0xb0 [ 25.696162] ? pppoe_getname+0x210/0x210 [ 25.700200] sock_sendmsg+0xca/0x110 [ 25.703886] sock_write_iter+0x31a/0x5d0 [ 25.707921] ? sock_sendmsg+0x110/0x110 [ 25.711873] ? bpf_fd_pass+0x280/0x280 [ 25.715734] ? ___might_sleep+0x45c/0x470 [ 25.719860] do_iter_readv_writev+0x525/0x7f0 [ 25.724329] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 25.729058] ? rw_verify_area+0xe5/0x2b0 [ 25.733091] do_iter_write+0x154/0x540 [ 25.736951] ? iov_iter_get_pages+0x1150/0x1150 [ 25.741597] compat_writev+0x225/0x420 [ 25.745456] ? __fget_light+0x297/0x380 [ 25.749402] ? do_pwritev+0x1a0/0x1a0 [ 25.753174] ? find_held_lock+0x35/0x1d0 [ 25.757213] ? __do_page_fault+0x5f7/0xc90 [ 25.761426] ? __fdget_pos+0x130/0x190 [ 25.765283] ? __fdget_raw+0x20/0x20 [ 25.768966] ? down_read_trylock+0xdb/0x170 [ 25.773261] ? __do_page_fault+0x32d/0xc90 [ 25.777468] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.782029] do_compat_writev+0x115/0x220 [ 25.786149] ? do_compat_writev+0x115/0x220 [ 25.790445] ? compat_writev+0x420/0x420 [ 25.794495] compat_SyS_writev+0x26/0x30 [ 25.798526] ? compat_SyS_preadv2+0x90/0x90 [ 25.802818] do_fast_syscall_32+0x3ee/0xf9d [ 25.807114] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.811667] ? kasan_check_read+0x11/0x20 [ 25.815789] ? syscall_return_slowpath+0x550/0x550 [ 25.820696] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.824906] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.829113] ? SyS_read+0x184/0x220 [ 25.832713] ? retint_user+0x18/0x18 [ 25.836404] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.841221] entry_SYSENTER_compat+0x54/0x63 [ 25.845600] RIP: 0023:0xf7fbbc79 [ 25.848936] RSP: 002b:00000000ff97a7fc EFLAGS: 00000286 ORIG_RAX: 0000000000000092 [ 25.856613] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020211f90 [ 25.863853] RDX: 0000000000000001 RSI: 00000000ff97a85c RDI: 0000000020adffb2 [ 25.871094] RBP: 000000000000002a R08: 0000000000000000 R09: 0000000000000000 [ 25.878939] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.886184] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.893434] Code: 04 01 84 c0 74 04 3c 03 7e 23 8b 8b 80 00 00 00 41 57 48 c7 c7 a0 88 1f 86 52 56 4c 89 ea 41 50 4c 89 e6 45 89 f0 e8 b6 bd 28 fd <0f> 0b 4c 89 4d b8 4c 89 45 c0 48 89 75 c8 48 89 55 d0 e8 f7 09 [ 25.912506] RIP: skb_panic+0x162/0x1f0 RSP: ffff8801d9a976b0 [ 25.918529] ---[ end trace ebcb2330f117ce9f ]--- [ 25.923870] Kernel panic - not syncing: Fatal exception [ 25.929736] Dumping ftrace buffer: [ 25.933255] (ftrace buffer empty) [ 25.936936] Kernel Offset: disabled [ 25.940535] Rebooting in 86400 seconds..