[....] Starting enhanced syslogd: rsyslogd[ 10.921968] audit: type=1400 audit(1516903267.056:4): avc: denied { syslog } for pid=3171 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[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.833452] kasan: CONFIG_KASAN_INLINE enabled [ 19.834167] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.835137] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.835957] Dumping ftrace buffer: [ 19.836456] (ftrace buffer empty) [ 19.837183] Modules linked in: [ 19.837668] CPU: 0 PID: 3320 Comm: syzkaller631658 Not tainted 4.9.78-ge37256c #30 [ 19.838689] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.839971] task: ffff8801ccbb9800 task.stack: ffff8801c9430000 [ 19.840785] RIP: 0010:[] [] ip6_xmit+0xb25/0x1bd0 [ 19.841925] RSP: 0018:ffff8801c94376c0 EFLAGS: 00010246 [ 19.842659] RAX: dffffc0000000000 RBX: ffff8801c9560140 RCX: ffffffff8341f2ab [ 19.843613] RDX: ffff8801c95601b8 RSI: ffffffff844de160 RDI: ffff8801d8254718 [ 19.844577] RBP: ffff8801c94378d8 R08: 0000000000000000 R09: 0000000000000000 [ 19.845528] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d0778480 [ 19.846484] R13: 0000000000000001 R14: 0000000000000040 R15: ffff8801c0dc0064 [ 19.847450] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008c21840 [ 19.848524] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.849322] CR2: 000000002037ffc8 CR3: 00000001c9a04000 CR4: 0000000000160670 [ 19.850385] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.851341] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.852296] Stack: [ 19.852593] ffff8801c94376d0 ffffffff8107c736 ffff8801c9437710 ffffffff81235290 [ 19.854908] 0001000300000001 0000000000000000 1ffff10039286ee6 ffff8801c9560208 [ 19.862866] ffff8801c9560198 ffff8801c95601b8 ffff8801cc3a8d00 ffff8801cfac4000 [ 19.870913] Call Trace: [ 19.873472] [] ? save_stack_trace+0x16/0x20 [ 19.879414] [] ? save_trace+0xe0/0x270 [ 19.884919] [] ? ip6_finish_output2+0x1d20/0x1d20 [ 19.891382] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 19.898361] [] ? __lock_is_held+0xa1/0xf0 [ 19.904129] [] ? ipv4_dst_check+0x111/0x160 [ 19.910070] [] ? __sk_dst_check+0x10e/0x240 [ 19.916015] [] inet6_csk_xmit+0x27d/0x4d0 [ 19.921780] [] ? inet6_csk_xmit+0x100/0x4d0 [ 19.927716] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 19.934266] [] l2tp_xmit_skb+0xcdc/0xf50 [ 19.939945] [] pppol2tp_sendmsg+0x5c0/0x7a0 [ 19.945885] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 19.952343] [] ? pppol2tp_release+0x2e0/0x2e0 [ 19.958457] [] sock_sendmsg+0xca/0x110 [ 19.963959] [] ___sys_sendmsg+0x6d1/0x7e0 [ 19.969725] [] ? copy_msghdr_from_user+0x550/0x550 [ 19.976273] [] ? __lru_cache_add+0x187/0x250 [ 19.982299] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 19.989366] [] ? _raw_spin_unlock+0x2c/0x50 [ 19.995305] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 20.002372] [] ? handle_mm_fault+0x6ee/0x2530 [ 20.008482] [] ? __fget_light+0x158/0x1e0 [ 20.014247] [] ? __fdget+0x18/0x20 [ 20.019404] [] ? sockfd_lookup_light+0x118/0x160 [ 20.025778] [] __sys_sendmsg+0xd6/0x190 [ 20.031367] [] ? SyS_shutdown+0x1b0/0x1b0 [ 20.037139] [] ? __do_page_fault+0x5ec/0xd40 [ 20.043168] [] compat_SyS_sendmsg+0x2a/0x40 [ 20.049107] [] ? compat_SyS_getsockopt+0x2a0/0x2a0 [ 20.055655] [] do_fast_syscall_32+0x2f7/0x890 [ 20.061764] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.068398] [] entry_SYSENTER_compat+0x74/0x83 [ 20.074595] Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 45 0f 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 48 4d 8b a4 24 18 03 00 00 <65> 49 ff 44 24 28 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f [ 20.101074] RIP [] ip6_xmit+0xb25/0x1bd0 [ 20.106869] RSP [ 20.110494] ---[ end trace 3d11573bd4884e16 ]--- [ 20.115227] Kernel panic - not syncing: Fatal exception in interrupt [ 20.122132] Dumping ftrace buffer: [ 20.125639] (ftrace buffer empty) [ 20.129317] Kernel Offset: disabled [ 20.132910] Rebooting in 86400 seconds..