[....] Starting enhanced syslogd: rsyslogd[ 12.543465] audit: type=1400 audit(1519462777.194:4): avc: denied { syslog } for pid=3646 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 Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 29.300204] ------------[ cut here ]------------ [ 29.304966] kernel BUG at ./include/linux/skbuff.h:1935! [ 29.310383] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 29.315714] Dumping ftrace buffer: [ 29.319222] (ftrace buffer empty) [ 29.322902] Modules linked in: [ 29.326188] CPU: 1 PID: 3803 Comm: syzkaller156190 Not tainted 4.9.83-g72766d7 #42 [ 29.333862] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.343198] task: ffff8801bc9b3000 task.stack: ffff8801d7638000 [ 29.349233] RIP: 0010:[] [] __ip6_make_skb+0x121c/0x1c20 [ 29.357987] RSP: 0018:ffff8801d763f420 EFLAGS: 00010293 [ 29.363403] RAX: ffff8801bc9b3000 RBX: 0000000000000738 RCX: ffffffff8342a7bc [ 29.370647] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d74b84e0 [ 29.377898] RBP: ffff8801d763f640 R08: ffff8801c55f8938 R09: 0000000000000000 [ 29.385137] R10: 0000000000001100 R11: ffffed003af539b6 R12: 00000000000000d6 [ 29.392377] R13: ffff8801c55f88c0 R14: ffff8801c55f893c R15: ffff8801d74b8000 [ 29.399617] FS: 0000000001ee7880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.407811] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.413660] CR2: 000000002000b000 CR3: 00000001da372000 CR4: 0000000000160670 [ 29.420899] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.428139] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.435377] Stack: [ 29.437494] ffff8801c55f8ac8 ffff8801c55f897c ffff8801c55f8990 ffff8801c55f8988 [ 29.445464] ffff8801d7a9e3c8 1ffff1003aec7e96 ffff8801c4601500 ffff8801d0340d20 [ 29.453438] ffff8801d74b8012 ffff8801d74b8540 ffffffff84933a80 ffff8801c55f8948 [ 29.461407] Call Trace: [ 29.463968] [] ? ip6_output+0x6a0/0x6a0 [ 29.469559] [] ? __ip6_append_data.isra.43+0xc18/0x3370 [ 29.476540] [] ? __udpv6_queue_rcv_skb+0x3b0/0x3b0 [ 29.483087] [] ? ip6_setup_cork+0x1270/0x1270 [ 29.489199] [] udp_v6_push_pending_frames+0x20a/0x340 [ 29.496007] [] ? udpv6_destroy_sock+0xd0/0xd0 [ 29.502118] [] ? __udpv6_queue_rcv_skb+0x3b0/0x3b0 [ 29.508665] [] udpv6_sendmsg+0x1f38/0x2540 [ 29.514516] [] ? __udpv6_queue_rcv_skb+0x3b0/0x3b0 [ 29.521063] [] ? udp_v6_rehash+0xa0/0xa0 [ 29.526743] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.533728] [] ? sock_has_perm+0x1c2/0x3e0 [ 29.539581] [] ? sock_has_perm+0x292/0x3e0 [ 29.545437] [] ? sock_has_perm+0x9f/0x3e0 [ 29.551204] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 29.558276] [] ? check_preemption_disabled+0x3b/0x200 [ 29.565084] [] ? inet_sendmsg+0x201/0x4c0 [ 29.570850] [] inet_sendmsg+0x2bc/0x4c0 [ 29.576446] [] ? inet_sendmsg+0x73/0x4c0 [ 29.582125] [] ? inet_recvmsg+0x4c0/0x4c0 [ 29.587892] [] sock_sendmsg+0xca/0x110 [ 29.593396] [] ___sys_sendmsg+0x320/0x7e0 [ 29.599159] [] ? copy_msghdr_from_user+0x570/0x570 [ 29.605708] [] ? ___sys_sendmsg+0x14c/0x7e0 [ 29.611652] [] ? ___sys_sendmsg+0x151/0x7e0 [ 29.617589] [] ? copy_msghdr_from_user+0x570/0x570 [ 29.624137] [] ? __lru_cache_add+0x187/0x250 [ 29.630173] [] ? __fget_light+0x169/0x1f0 [ 29.635941] [] ? __fdget+0x18/0x20 [ 29.641101] [] __sys_sendmmsg+0x159/0x3a0 [ 29.646868] [] ? SyS_sendmsg+0x50/0x50 [ 29.652373] [] ? handle_mm_fault+0x6ee/0x2530 [ 29.658485] [] ? __fget_light+0x169/0x1f0 [ 29.664250] [] ? __fdget+0x18/0x20 [ 29.669410] [] ? sockfd_lookup_light+0x118/0x160 [ 29.675785] [] ? __do_page_fault+0x5ec/0xd40 [ 29.681813] [] SyS_sendmmsg+0x35/0x60 [ 29.687232] [] ? __sys_sendmmsg+0x3a0/0x3a0 [ 29.693174] [] do_syscall_64+0x1a4/0x490 [ 29.698854] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 29.705746] Code: 08 84 c9 0f 85 9f 08 00 00 41 3b 45 7c 72 17 e8 7b 0c f4 fd 45 89 e6 4d 01 f7 4d 89 bd d0 00 00 00 e9 0d f2 ff ff e8 64 0c f4 fd <0f> 0b e8 5d 0c f4 fd 48 8b 7c 24 50 e8 c3 cd fe ff 41 89 c4 e9 [ 29.732335] RIP [] __ip6_make_skb+0x121c/0x1c20 [ 29.738739] RSP [ 29.742605] ---[ end trace 516dd4911c28aca7 ]--- [ 29.747415] Kernel panic - not syncing: Fatal exception [ 29.753223] Dumping ftrace buffer: [ 29.756735] (ftrace buffer empty) [ 29.760413] Kernel Offset: disabled [ 29.764008] Rebooting in 86400 seconds..