[....] Starting enhanced syslogd: rsyslogd[ 10.683946] audit: type=1400 audit(1515374392.522:4): avc: denied { syslog } for pid=3173 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.217' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz5.router_solicitations = 0 syzkaller login: [ 19.526330] IPVS: Creating netns size=2536 id=1 [ 19.536848] IPVS: Creating netns size=2536 id=2 net.ipv6.conf.syz4.accept_dad = 0 [ 19.573208] IPVS: Creating netns size=2536 id=3 executing program executing program executing program net.ipv6.conf.syz4.router_solicitations = 0 executing program executing program executing program net.ipv6.conf.syz1.accept_dad = 0 executing program [ 19.600267] IPVS: Creating netns size=2536 id=4 executing program executing program executing program [ 19.650515] IPVS: Creating netns size=2536 id=5 [ 19.655212] kasan: CONFIG_KASAN_INLINE enabled [ 19.655215] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.655225] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.655230] Dumping ftrace buffer: [ 19.655233] (ftrace buffer empty) [ 19.655237] Modules linked in: [ 19.655245] CPU: 0 PID: 3330 Comm: syzkaller020491 Not tainted 4.9.75-g5f5e5d4 #7 [ 19.655248] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.655253] task: ffff8801cb7e1800 task.stack: ffff8801c84d0000 [ 19.655269] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.655273] RSP: 0018:ffff8801c84d79b0 EFLAGS: 00010a07 [ 19.655277] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 19.655281] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.655284] RBP: ffff8801c84d79c0 R08: 0000000000000001 R09: 0000000000000001 [ 19.655287] R10: 0000000000000000 R11: ffff8801cb7e1800 R12: 0000000000000004 [ 19.655291] R13: 0000000000000020 R14: ffff8801c7868000 R15: dffffc0000000000 [ 19.655296] FS: 0000000001dac880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 19.655300] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.655303] CR2: 0000000020dc8000 CR3: 00000001c94c6000 CR4: 0000000000160670 [ 19.655309] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.655311] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.655312] Stack: [ 19.655321] ffffffff838b15a9 ffff8801c7868158 ffff8801c84d7a20 ffffffff82666341 [ 19.655329] ffff8801c7868170 ffffed0038f0d02b ffffed0038f0d02e ffff8801c7868168 [ 19.655336] dead4ead00000000 ffff8801c7868140 0000000000000000 0000000000000000 [ 19.655337] Call Trace: [ 19.655346] [] ? retint_kernel+0x2d/0x2d [ 19.655354] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.655360] [] sg_finish_rem_req+0x2b5/0x340 [ 19.655366] [] sg_new_read.isra.20+0x356/0x3e0 [ 19.655370] [] ? sg_get_rq_mark+0xd2/0x190 [ 19.655375] [] sg_read+0x8bd/0x1440 [ 19.655381] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.655389] [] ? fsnotify+0xf30/0xf30 [ 19.655397] [] ? avc_policy_seqno+0x9/0x20 [ 19.655405] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.655412] [] ? security_file_permission+0x89/0x1e0 [ 19.655418] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.655424] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.655430] [] do_readv_writev+0x520/0x750 [ 19.655436] [] ? vfs_write+0x530/0x530 [ 19.655444] [] ? __pmd_alloc+0x410/0x410 [ 19.655454] [] ? __do_page_fault+0x5ec/0xd40 [ 19.655460] [] vfs_readv+0x84/0xc0 [ 19.655466] [] do_readv+0xe6/0x250 [ 19.655471] [] ? vfs_readv+0xc0/0xc0 [ 19.655476] [] ? entry_SYSCALL_64_fastpath+0x5/0xe2 [ 19.655486] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.655493] [] SyS_readv+0x27/0x30 [ 19.655498] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 19.655602] Code: e9 27 fc ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d [ 19.655610] RIP [] __free_pages+0x21/0x80 [ 19.655612] RSP [ 19.655868] ---[ end trace 78b57c3a3e3b025f ]--- [ 19.655872] Kernel panic - not syncing: Fatal exception [ 19.656355] Dumping ftrace buffer: [ 19.656357] (ftrace buffer empty) [ 19.656360] Kernel Offset: disabled [ 20.020367] Rebooting in 86400 seconds..