[....] Starting enhanced syslogd: rsyslogd[ 13.259816] audit: type=1400 audit(1516047551.151:5): avc: denied { syslog } for pid=3514 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: [ 18.636265] audit: type=1400 audit(1516047556.527:6): avc: denied { map } for pid=3656 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 '10.128.0.45' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 24.847943] audit: type=1400 audit(1516047562.739:7): avc: denied { map } for pid=3670 comm="syzkaller801466" path="/root/syzkaller801466404" 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 [ 25.232939] 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 [ 25.577445] skbuff: skb_under_panic: text:000000001d390b3a len:31 put:24 head:00000000d8ed776f data:000000008150e823 tail:0x7 end:0xc0 dev:gre0 [ 25.591025] ------------[ cut here ]------------ [ 25.595774] kernel BUG at net/core/skbuff.c:104! [ 25.600565] invalid opcode: 0000 [#1] SMP KASAN [ 25.605217] Dumping ftrace buffer: [ 25.608729] (ftrace buffer empty) [ 25.612414] Modules linked in: [ 25.615580] CPU: 1 PID: 3670 Comm: syzkaller801466 Not tainted 4.15.0-rc7-next-20180115+ #97 [ 25.624122] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.633458] RIP: 0010:skb_panic+0x162/0x1f0 [ 25.637751] RSP: 0018:ffff8801d9bd7840 EFLAGS: 00010282 [ 25.643111] RAX: 0000000000000083 RBX: ffff8801d4f083c0 RCX: 0000000000000000 [ 25.650351] RDX: 0000000000000083 RSI: 1ffff1003b37ae92 RDI: ffffed003b37aefc [ 25.657601] RBP: ffff8801d9bd78a8 R08: 1ffff1003b37ae8a R09: 0000000000000000 [ 25.664843] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff86200de0 [ 25.672087] R13: ffffffff84a981ad R14: 0000000000000018 R15: ffff8801d2d34180 [ 25.679333] FS: 00000000019c4880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.687530] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.693382] CR2: 00000000208bc000 CR3: 00000001d9111001 CR4: 00000000001606e0 [ 25.700625] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.707868] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.715117] Call Trace: [ 25.717689] ? usercopy_abort+0xd0/0xd0 [ 25.721639] ? ipgre_header+0x6d/0x4e0 [ 25.725503] skb_push+0xce/0xf0 [ 25.728768] ipgre_header+0x6d/0x4e0 [ 25.732457] pppoe_sendmsg+0x58e/0x8b0 [ 25.736324] ? prepare_fb_xmit+0x990/0x990 [ 25.740532] ? pppoe_getname+0x210/0x210 [ 25.744568] ? selinux_socket_sendmsg+0x36/0x40 [ 25.749330] ? security_socket_sendmsg+0x89/0xb0 [ 25.754066] ? pppoe_getname+0x210/0x210 [ 25.758100] sock_sendmsg+0xca/0x110 [ 25.761801] sock_write_iter+0x31a/0x5d0 [ 25.765836] ? sock_sendmsg+0x110/0x110 [ 25.769805] ? bpf_fd_pass+0x280/0x280 [ 25.773669] ? ___might_sleep+0x44c/0x470 [ 25.777795] do_iter_readv_writev+0x525/0x7f0 [ 25.782265] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 25.786994] ? rw_verify_area+0xe5/0x2b0 [ 25.791038] do_iter_write+0x154/0x540 [ 25.794898] ? dup_iter+0x260/0x260 [ 25.798500] vfs_writev+0x18a/0x340 [ 25.802101] ? __fget_light+0x297/0x380 [ 25.806059] ? vfs_iter_write+0xb0/0xb0 [ 25.810008] ? up_read+0x1a/0x40 [ 25.813355] ? __do_page_fault+0x3d6/0xc90 [ 25.817565] ? mm_fault_error+0x2c0/0x2c0 [ 25.821687] ? __fdget_pos+0x130/0x190 [ 25.825558] ? __fdget_raw+0x20/0x20 [ 25.829249] ? __do_page_fault+0xc90/0xc90 [ 25.833461] do_writev+0xfc/0x2a0 [ 25.836884] ? do_writev+0xfc/0x2a0 [ 25.840486] ? vfs_writev+0x340/0x340 [ 25.844261] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 25.849078] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.854071] SyS_writev+0x27/0x30 [ 25.857500] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 25.862232] RIP: 0033:0x445009 [ 25.865392] RSP: 002b:00007ffcab0aa648 EFLAGS: 00000217 ORIG_RAX: 0000000000000014 [ 25.873071] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000445009 [ 25.880314] RDX: 0000000000000001 RSI: 0000000020211f90 RDI: 0000000000000004 [ 25.887560] RBP: 00007ffcab0aa748 R08: 0000000020adffb2 R09: 0000000020adffb2 [ 25.894808] R10: 0000000020adffb2 R11: 0000000000000217 R12: 00007ffcab0aa748 [ 25.902057] R13: 0000000000402510 R14: 0000000000000000 R15: 0000000000000000 [ 25.909317] Code: 04 01 84 c0 74 04 3c 03 7e 23 8b 8b 80 00 00 00 41 57 48 c7 c7 a0 06 20 86 52 56 4c 89 ea 41 50 4c 89 e6 45 89 f0 e8 b6 c9 23 fd <0f> 0b 4c 89 4d b8 4c 89 45 c0 48 89 75 c8 48 89 55 d0 e8 37 42 [ 25.928395] RIP: skb_panic+0x162/0x1f0 RSP: ffff8801d9bd7840 [ 25.934423] ---[ end trace 1478d06428a41d88 ]--- [ 25.940546] Kernel panic - not syncing: Fatal exception [ 25.946340] Dumping ftrace buffer: [ 25.949861] (ftrace buffer empty) [ 25.953549] Kernel Offset: disabled [ 25.957146] Rebooting in 86400 seconds..