[....] Starting enhanced syslogd: rsyslogd[ 13.117047] audit: type=1400 audit(1516050919.364:5): avc: denied { syslog } for pid=3504 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: [ 18.894842] audit: type=1400 audit(1516050925.142:6): avc: denied { map } for pid=3647 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 '10.128.15.220' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 35.825966] audit: type=1400 audit(1516050942.073:7): avc: denied { map } for pid=3664 comm="syzkaller186644" path="/root/syzkaller186644361" 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 [ 36.096870] 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 [ 36.436262] skbuff: skb_under_panic: text:00000000d8c6bef3 len:31 put:24 head:00000000ef28dcdd data:00000000dbada750 tail:0x7 end:0xc0 dev:gre0 [ 36.449500] ------------[ cut here ]------------ [ 36.454233] kernel BUG at net/core/skbuff.c:104! [ 36.459215] invalid opcode: 0000 [#1] SMP KASAN [ 36.463861] Dumping ftrace buffer: [ 36.467370] (ftrace buffer empty) [ 36.471050] Modules linked in: [ 36.474217] CPU: 0 PID: 3664 Comm: syzkaller186644 Not tainted 4.15.0-rc8+ #173 [ 36.481630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.490969] RIP: 0010:skb_panic+0x162/0x1f0 [ 36.495260] RSP: 0018:ffff8801d9ab76b0 EFLAGS: 00010282 [ 36.500591] RAX: 0000000000000083 RBX: ffff8801d4d811c0 RCX: 0000000000000000 [ 36.507831] RDX: 0000000000000083 RSI: 1ffff1003b356e96 RDI: ffffed003b356eca [ 36.515075] RBP: ffff8801d9ab7718 R08: 1ffff1003b356e58 R09: 0000000000000000 [ 36.522322] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff861f8fe0 [ 36.529565] R13: ffffffff84a31e3d R14: 0000000000000018 R15: ffff8801d31d00c0 [ 36.536811] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008ed6840 [ 36.545449] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.551299] CR2: 00000000208bc000 CR3: 00000001bc95d003 CR4: 00000000001606f0 [ 36.558837] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.566081] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.573322] Call Trace: [ 36.575886] ? check_stack_object+0x140/0x140 [ 36.580444] ? ipgre_header+0x6d/0x4e0 [ 36.584304] skb_push+0xce/0xf0 [ 36.587556] ipgre_header+0x6d/0x4e0 [ 36.591241] pppoe_sendmsg+0x58e/0x8b0 [ 36.595095] ? gretap_fb_dev_create+0x250/0x250 [ 36.599749] ? pppoe_getname+0x210/0x210 [ 36.604043] ? selinux_socket_sendmsg+0x36/0x40 [ 36.609205] ? security_socket_sendmsg+0x89/0xb0 [ 36.613930] ? pppoe_getname+0x210/0x210 [ 36.617961] sock_sendmsg+0xca/0x110 [ 36.621644] sock_write_iter+0x31a/0x5d0 [ 36.625677] ? sock_sendmsg+0x110/0x110 [ 36.629622] ? bpf_fd_pass+0x280/0x280 [ 36.633480] ? ___might_sleep+0x45c/0x470 [ 36.637600] do_iter_readv_writev+0x525/0x7f0 [ 36.642675] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 36.647404] ? rw_verify_area+0xe5/0x2b0 [ 36.651723] do_iter_write+0x154/0x540 [ 36.655583] ? iov_iter_get_pages+0x1150/0x1150 [ 36.660223] compat_writev+0x225/0x420 [ 36.664080] ? __fget_light+0x297/0x380 [ 36.668029] ? do_pwritev+0x1a0/0x1a0 [ 36.672149] ? find_held_lock+0x35/0x1d0 [ 36.676184] ? __do_page_fault+0x5f7/0xc90 [ 36.680477] ? __fdget_pos+0x130/0x190 [ 36.684337] ? __fdget_raw+0x20/0x20 [ 36.688026] ? down_read_trylock+0xdb/0x170 [ 36.692319] ? __do_page_fault+0x32d/0xc90 [ 36.696527] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 36.701086] do_compat_writev+0x115/0x220 [ 36.705215] ? do_compat_writev+0x115/0x220 [ 36.709515] ? compat_writev+0x420/0x420 [ 36.713557] compat_SyS_writev+0x26/0x30 [ 36.717589] ? compat_SyS_preadv2+0x90/0x90 [ 36.721898] do_fast_syscall_32+0x3ee/0xf9d [ 36.726282] ? do_int80_syscall_32+0x9d0/0x9d0 [ 36.730834] ? kasan_check_read+0x11/0x20 [ 36.734953] ? syscall_return_slowpath+0x550/0x550 [ 36.739861] ? SyS_rt_sigaction+0x94/0x1b0 [ 36.744340] ? SyS_sigprocmask+0x4b0/0x4b0 [ 36.748551] ? SyS_read+0x184/0x220 [ 36.752148] ? retint_user+0x18/0x18 [ 36.755837] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.760652] entry_SYSENTER_compat+0x54/0x63 [ 36.765033] RIP: 0023:0xf7f9ac79 [ 36.768368] RSP: 002b:00000000ffefbccc EFLAGS: 00000286 ORIG_RAX: 0000000000000092 [ 36.776046] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020211f90 [ 36.783291] RDX: 0000000000000001 RSI: 00000000ffefbd2c RDI: 0000000000000003 [ 36.790530] RBP: 00000000ffefbdbc R08: 0000000000000000 R09: 0000000000000000 [ 36.798738] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 36.805978] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 36.813227] 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 [ 36.833178] RIP: skb_panic+0x162/0x1f0 RSP: ffff8801d9ab76b0 [ 36.839457] ---[ end trace bd8c65a61baea614 ]--- [ 36.844345] Kernel panic - not syncing: Fatal exception [ 36.850293] Dumping ftrace buffer: [ 36.853895] (ftrace buffer empty) [ 36.858969] Kernel Offset: disabled [ 36.862744] Rebooting in 86400 seconds..