[....] Starting enhanced syslogd: rsyslogd[ 11.906947] audit: type=1400 audit(1516051846.062:5): avc: denied { syslog } for pid=3492 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 17.495404] audit: type=1400 audit(1516051851.651:6): avc: denied { map } for pid=3631 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 '10.128.0.60' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 33.783775] audit: type=1400 audit(1516051867.939:7): avc: denied { map } for pid=3648 comm="syzkaller888153" path="/root/syzkaller888153256" 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 RTNETLINK answers: Operation not supported [ 34.045630] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 34.354336] skbuff: skb_under_panic: text:000000000470095b len:82 put:24 head:00000000f453c8df data:000000007cc2256c tail:0x3a end:0xc0 dev:gre0 [ 34.367572] ------------[ cut here ]------------ [ 34.372298] kernel BUG at net/core/skbuff.c:104! [ 34.377065] invalid opcode: 0000 [#1] SMP KASAN [ 34.381704] Dumping ftrace buffer: [ 34.385210] (ftrace buffer empty) [ 34.388893] Modules linked in: [ 34.392058] CPU: 0 PID: 3648 Comm: syzkaller888153 Not tainted 4.15.0-rc8+ #263 [ 34.399497] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.408828] RIP: 0010:skb_panic+0x162/0x1f0 [ 34.413116] RSP: 0018:ffff8801bc95f840 EFLAGS: 00010282 [ 34.418448] RAX: 0000000000000084 RBX: ffff8801d4c40800 RCX: 0000000000000000 [ 34.425688] RDX: 0000000000000084 RSI: 1ffff1003792bec8 RDI: ffffed003792befc [ 34.432930] RBP: ffff8801bc95f8a8 R08: 1ffff1003792be8a R09: 0000000000000000 [ 34.440167] R10: 0000000000000008 R11: 0000000000000000 R12: ffffffff861f8fe0 [ 34.447407] R13: ffffffff84a31e3d R14: 0000000000000018 R15: ffff8801d31ae0c0 [ 34.454650] FS: 000000000251d880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.462842] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.468694] CR2: 0000000020fa3000 CR3: 00000001d94ef006 CR4: 00000000001606f0 [ 34.475937] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.483177] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.490414] Call Trace: [ 34.492974] ? check_stack_object+0x140/0x140 [ 34.497440] ? ipgre_header+0x6d/0x4e0 [ 34.501306] skb_push+0xce/0xf0 [ 34.504562] ipgre_header+0x6d/0x4e0 [ 34.508249] pppoe_sendmsg+0x58e/0x8b0 [ 34.512104] ? gretap_fb_dev_create+0x250/0x250 [ 34.516742] ? pppoe_getname+0x210/0x210 [ 34.520774] ? selinux_socket_sendmsg+0x36/0x40 [ 34.525410] ? security_socket_sendmsg+0x89/0xb0 [ 34.530131] ? pppoe_getname+0x210/0x210 [ 34.534161] sock_sendmsg+0xca/0x110 [ 34.537847] sock_write_iter+0x31a/0x5d0 [ 34.541878] ? sock_sendmsg+0x110/0x110 [ 34.545827] ? bpf_fd_pass+0x280/0x280 [ 34.549683] ? ___might_sleep+0x45c/0x470 [ 34.553801] do_iter_readv_writev+0x525/0x7f0 [ 34.558267] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 34.562995] ? rw_verify_area+0xe5/0x2b0 [ 34.567027] do_iter_write+0x154/0x540 [ 34.570887] ? dup_iter+0x260/0x260 [ 34.574489] vfs_writev+0x18a/0x340 [ 34.578086] ? __fget_light+0x297/0x380 [ 34.582030] ? vfs_iter_write+0xb0/0xb0 [ 34.585974] ? up_read+0x1a/0x40 [ 34.589311] ? __do_page_fault+0x3d6/0xc90 [ 34.593531] ? mm_fault_error+0x2c0/0x2c0 [ 34.597654] ? __fdget_raw+0x20/0x20 [ 34.601337] ? __do_page_fault+0xc90/0xc90 [ 34.605550] do_writev+0xfc/0x2a0 [ 34.608974] ? do_writev+0xfc/0x2a0 [ 34.612571] ? vfs_writev+0x340/0x340 [ 34.616353] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 34.621166] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.626153] SyS_writev+0x27/0x30 [ 34.629593] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 34.634326] RIP: 0033:0x445109 [ 34.637486] RSP: 002b:00007fff3b81d8d8 EFLAGS: 00000217 ORIG_RAX: 0000000000000014 [ 34.645161] RAX: ffffffffffffffda RBX: 00000000004a6952 RCX: 0000000000445109 [ 34.652400] RDX: 0000000000000006 RSI: 0000000020935fa0 RDI: 0000000000000004 [ 34.659637] RBP: 00007fff3b81d9d8 R08: 0000000020ae0000 R09: 0000000020ae0000 [ 34.666878] R10: 0000000020ae0000 R11: 0000000000000217 R12: 00007fff3b81d9d8 [ 34.674116] R13: 0000000000402610 R14: 0000000000000000 R15: 0000000000000000 [ 34.681362] 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 [ 34.700425] RIP: skb_panic+0x162/0x1f0 RSP: ffff8801bc95f840 [ 34.706348] ---[ end trace 0b1fd34e17500035 ]--- [ 34.711186] Kernel panic - not syncing: Fatal exception [ 34.716919] Dumping ftrace buffer: [ 34.720430] (ftrace buffer empty) [ 34.724113] Kernel Offset: disabled [ 34.727712] Rebooting in 86400 seconds..