[....] Starting enhanced syslogd: rsyslogd[ 12.679480] audit: type=1400 audit(1516048627.288:5): avc: denied { syslog } for pid=3496 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: [ 18.456774] audit: type=1400 audit(1516048633.065:6): avc: denied { map } for pid=3637 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 '10.128.15.216' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 30.584469] audit: type=1400 audit(1516048645.193:7): avc: denied { map } for pid=3653 comm="syzkaller832734" path="/root/syzkaller832734485" 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 [ 30.861373] 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 [ 31.208109] skbuff: skb_under_panic: text:00000000b79b83f2 len:31 put:24 head:00000000739513bb data:00000000b8892a69 tail:0x7 end:0xc0 dev:gre0 [ 31.221345] ------------[ cut here ]------------ [ 31.226081] kernel BUG at net/core/skbuff.c:104! [ 31.230916] invalid opcode: 0000 [#1] SMP KASAN [ 31.235560] Dumping ftrace buffer: [ 31.239069] (ftrace buffer empty) [ 31.242751] Modules linked in: [ 31.245916] CPU: 0 PID: 3653 Comm: syzkaller832734 Not tainted 4.15.0-rc8+ #263 [ 31.253332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.262666] RIP: 0010:skb_panic+0x162/0x1f0 [ 31.266982] RSP: 0018:ffff8801bd437840 EFLAGS: 00010282 [ 31.272316] RAX: 0000000000000083 RBX: ffff8801d5e1b000 RCX: 0000000000000000 [ 31.279564] RDX: 0000000000000083 RSI: 1ffff10037a86ec8 RDI: ffffed0037a86efc [ 31.286806] RBP: ffff8801bd4378a8 R08: 1ffff10037a86e8a R09: 0000000000000000 [ 31.294047] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff861f8fe0 [ 31.301291] R13: ffffffff84a31e3d R14: 0000000000000018 R15: ffff8801d31a80c0 [ 31.308541] FS: 000000000076f880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.316736] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.322590] CR2: 00000000208bc000 CR3: 00000001bb5f2005 CR4: 00000000001606f0 [ 31.329836] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.337082] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.344324] Call Trace: [ 31.346889] ? check_stack_object+0x140/0x140 [ 31.351355] ? ipgre_header+0x6d/0x4e0 [ 31.355216] skb_push+0xce/0xf0 [ 31.358466] ipgre_header+0x6d/0x4e0 [ 31.362157] pppoe_sendmsg+0x58e/0x8b0 [ 31.366023] ? gretap_fb_dev_create+0x250/0x250 [ 31.370665] ? pppoe_getname+0x210/0x210 [ 31.374708] ? selinux_socket_sendmsg+0x36/0x40 [ 31.379350] ? security_socket_sendmsg+0x89/0xb0 [ 31.384076] ? pppoe_getname+0x210/0x210 [ 31.388109] sock_sendmsg+0xca/0x110 [ 31.391792] sock_write_iter+0x31a/0x5d0 [ 31.395824] ? sock_sendmsg+0x110/0x110 [ 31.399772] ? bpf_fd_pass+0x280/0x280 [ 31.403633] ? ___might_sleep+0x45c/0x470 [ 31.407765] do_iter_readv_writev+0x525/0x7f0 [ 31.412243] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 31.416972] ? rw_verify_area+0xe5/0x2b0 [ 31.421013] do_iter_write+0x154/0x540 [ 31.424878] ? dup_iter+0x260/0x260 [ 31.428479] vfs_writev+0x18a/0x340 [ 31.432074] ? __fget_light+0x297/0x380 [ 31.436027] ? vfs_iter_write+0xb0/0xb0 [ 31.439972] ? up_read+0x1a/0x40 [ 31.443322] ? __do_page_fault+0x3d6/0xc90 [ 31.447531] ? mm_fault_error+0x2c0/0x2c0 [ 31.451651] ? __fdget_pos+0x130/0x190 [ 31.455509] ? __fdget_raw+0x20/0x20 [ 31.459216] ? __do_page_fault+0xc90/0xc90 [ 31.463421] do_writev+0xfc/0x2a0 [ 31.466850] ? do_writev+0xfc/0x2a0 [ 31.470449] ? vfs_writev+0x340/0x340 [ 31.474222] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 31.479036] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.484111] SyS_writev+0x27/0x30 [ 31.487536] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 31.492263] RIP: 0033:0x445009 [ 31.495424] RSP: 002b:00007ffcc39d9128 EFLAGS: 00000217 ORIG_RAX: 0000000000000014 [ 31.503102] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000445009 [ 31.510341] RDX: 0000000000000001 RSI: 0000000020211f90 RDI: 0000000000000004 [ 31.517588] RBP: 00007ffcc39d9228 R08: 0000000020adffb2 R09: 0000000020adffb2 [ 31.524831] R10: 0000000020adffb2 R11: 0000000000000217 R12: 00007ffcc39d9228 [ 31.532077] R13: 0000000000402510 R14: 0000000000000000 R15: 0000000000000000 [ 31.539339] 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 [ 31.558421] RIP: skb_panic+0x162/0x1f0 RSP: ffff8801bd437840 [ 31.564439] ---[ end trace 2e5d1a4fe231d692 ]--- [ 31.569503] Kernel panic - not syncing: Fatal exception [ 31.575263] Dumping ftrace buffer: [ 31.578780] (ftrace buffer empty) [ 31.582466] Kernel Offset: disabled [ 31.586071] Rebooting in 86400 seconds..