[....] Starting enhanced syslogd: rsyslogd[ 14.097662] audit: type=1400 audit(1516051043.135:5): avc: denied { syslog } for pid=3497 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: [ 18.502146] audit: type=1400 audit(1516051047.539:6): avc: denied { map } for pid=3636 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 '10.128.15.232' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 24.793855] audit: type=1400 audit(1516051053.831:7): avc: denied { map } for pid=3650 comm="syzkaller039837" path="/root/syzkaller039837116" 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 [ 25.204664] 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 [ 25.594574] skbuff: skb_under_panic: text:000000008b0f63ee len:31 put:24 head:0000000004ec822b data:00000000c40a8605 tail:0x7 end:0xc0 dev:gre0 [ 25.609459] ------------[ cut here ]------------ [ 25.614204] kernel BUG at net/core/skbuff.c:104! [ 25.619494] invalid opcode: 0000 [#1] SMP KASAN [ 25.624163] Dumping ftrace buffer: [ 25.627678] (ftrace buffer empty) [ 25.631364] Modules linked in: [ 25.634531] CPU: 0 PID: 3650 Comm: syzkaller039837 Not tainted 4.15.0-rc8+ #263 [ 25.642398] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.651735] RIP: 0010:skb_panic+0x162/0x1f0 [ 25.656029] RSP: 0018:ffff8801d9bbf840 EFLAGS: 00010282 [ 25.661367] RAX: 0000000000000083 RBX: ffff8801d5008480 RCX: 0000000000000000 [ 25.668613] RDX: 0000000000000083 RSI: 1ffff1003b377ec8 RDI: ffffed003b377efc [ 25.675858] RBP: ffff8801d9bbf8a8 R08: 1ffff1003b377e8a R09: 0000000000000000 [ 25.683102] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff861f8fe0 [ 25.690346] R13: ffffffff84a31e3d R14: 0000000000000018 R15: ffff8801d31c20c0 [ 25.697590] FS: 0000000002000880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.705791] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.711646] CR2: 00000000208bc000 CR3: 00000001d9ad6002 CR4: 00000000001606f0 [ 25.718897] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.726142] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.733386] Call Trace: [ 25.735958] ? check_stack_object+0x140/0x140 [ 25.740427] ? ipgre_header+0x6d/0x4e0 [ 25.744301] skb_push+0xce/0xf0 [ 25.747555] ipgre_header+0x6d/0x4e0 [ 25.751249] pppoe_sendmsg+0x58e/0x8b0 [ 25.755120] ? gretap_fb_dev_create+0x250/0x250 [ 25.759766] ? pppoe_getname+0x210/0x210 [ 25.763803] ? selinux_socket_sendmsg+0x36/0x40 [ 25.768448] ? security_socket_sendmsg+0x89/0xb0 [ 25.773181] ? pppoe_getname+0x210/0x210 [ 25.777220] sock_sendmsg+0xca/0x110 [ 25.780922] sock_write_iter+0x31a/0x5d0 [ 25.784956] ? sock_sendmsg+0x110/0x110 [ 25.788909] ? bpf_fd_pass+0x280/0x280 [ 25.792772] ? ___might_sleep+0x45c/0x470 [ 25.796898] do_iter_readv_writev+0x525/0x7f0 [ 25.801370] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 25.806102] ? rw_verify_area+0xe5/0x2b0 [ 25.810145] do_iter_write+0x154/0x540 [ 25.814012] ? dup_iter+0x260/0x260 [ 25.817970] vfs_writev+0x18a/0x340 [ 25.821582] ? __fget_light+0x297/0x380 [ 25.825530] ? vfs_iter_write+0xb0/0xb0 [ 25.829476] ? up_read+0x1a/0x40 [ 25.832816] ? __do_page_fault+0x3d6/0xc90 [ 25.837038] ? mm_fault_error+0x2c0/0x2c0 [ 25.841170] ? __fdget_pos+0x130/0x190 [ 25.845036] ? __fdget_raw+0x20/0x20 [ 25.848726] ? __do_page_fault+0xc90/0xc90 [ 25.852941] do_writev+0xfc/0x2a0 [ 25.856367] ? do_writev+0xfc/0x2a0 [ 25.859968] ? vfs_writev+0x340/0x340 [ 25.863748] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 25.868567] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.873563] SyS_writev+0x27/0x30 [ 25.876990] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 25.881722] RIP: 0033:0x445029 [ 25.884883] RSP: 002b:00007ffe0d6f5648 EFLAGS: 00000217 ORIG_RAX: 0000000000000014 [ 25.892562] RAX: ffffffffffffffda RBX: 00000000004a6872 RCX: 0000000000445029 [ 25.899810] RDX: 0000000000000001 RSI: 0000000020211f90 RDI: 0000000000000004 [ 25.907056] RBP: 00007ffe0d6f5758 R08: 0000000000000000 R09: 0000000000000000 [ 25.914302] R10: 0000000000000000 R11: 0000000000000217 R12: 00007ffe0d6f5758 [ 25.921544] R13: 0000000000402530 R14: 0000000000000000 R15: 0000000000000000 [ 25.928795] 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 [ 25.947877] RIP: skb_panic+0x162/0x1f0 RSP: ffff8801d9bbf840 [ 25.953981] ---[ end trace 6493d09e22e8ae86 ]--- [ 25.958825] Kernel panic - not syncing: Fatal exception [ 25.965577] Dumping ftrace buffer: [ 25.969113] (ftrace buffer empty) [ 25.972797] Kernel Offset: disabled [ 25.976398] Rebooting in 86400 seconds..