[....] Starting enhanced syslogd: rsyslogd[ 13.412012] audit: type=1400 audit(1518150061.163:4): avc: denied { syslog } for pid=3645 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 '10.128.0.19' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 26.686096] kasan: CONFIG_KASAN_INLINE enabled [ 26.690724] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.698060] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.704261] Dumping ftrace buffer: [ 26.707767] (ftrace buffer empty) [ 26.711445] Modules linked in: [ 26.714720] CPU: 0 PID: 3801 Comm: syzkaller344157 Not tainted 4.9.80-g20c8a00 #30 [ 26.722402] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.731728] task: ffff8801d7869800 task.stack: ffff8801c7c80000 [ 26.737750] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.745985] RSP: 0018:ffff8801c7c879b0 EFLAGS: 00010a07 [ 26.751402] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266806b [ 26.758639] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.765887] RBP: ffff8801c7c879c0 R08: 0000000000000001 R09: 0000000000000001 [ 26.773125] R10: 0000000000000000 R11: ffff8801d7869800 R12: 0000000000000004 [ 26.780364] R13: 0000000000000020 R14: ffff8801d6928000 R15: dffffc0000000000 [ 26.787606] FS: 00000000016e0880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.795800] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.801652] CR2: 0000000020dc8000 CR3: 00000001b947c000 CR4: 0000000000160670 [ 26.808893] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.816135] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.823371] Stack: [ 26.825490] ffffffff838b4029 ffff8801d6928158 ffff8801c7c87a20 ffffffff82668091 [ 26.833452] ffff8801d6928170 ffffed003ad2502b ffffed003ad2502e ffff8801d6928168 [ 26.841432] dead4ead00000000 ffff8801d6928140 0000000000000000 0000000000000000 [ 26.849485] Call Trace: [ 26.852043] [] ? retint_kernel+0x2d/0x2d [ 26.857725] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.864283] [] sg_finish_rem_req+0x2b5/0x340 [ 26.870309] [] sg_new_read.isra.20+0x356/0x3e0 [ 26.876510] [] ? dev_seq_next+0x3c/0xe0 [ 26.882103] [] sg_read+0x8b7/0x1440 [ 26.887347] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.893982] [] ? fsnotify+0xf30/0xf30 [ 26.899403] [] ? avc_policy_seqno+0x9/0x20 [ 26.905258] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 26.912254] [] ? security_file_permission+0x89/0x1e0 [ 26.918974] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.925612] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.932247] [] do_readv_writev+0x520/0x750 [ 26.938111] [] ? vfs_write+0x530/0x530 [ 26.943637] [] ? __pmd_alloc+0x410/0x410 [ 26.949328] [] ? __do_page_fault+0x5ec/0xd40 [ 26.955362] [] vfs_readv+0x84/0xc0 [ 26.960519] [] do_readv+0xe6/0x250 [ 26.965676] [] ? vfs_readv+0xc0/0xc0 [ 26.971010] [] ? entry_SYSCALL_64_fastpath+0x5/0xe8 [ 26.977645] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.984466] [] SyS_readv+0x27/0x30 [ 26.989628] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 26.996172] 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 [ 27.022709] RIP [] __free_pages+0x21/0x80 [ 27.028599] RSP [ 27.033513] ---[ end trace 0d3ad2eb7d10022e ]--- [ 27.038266] Kernel panic - not syncing: Fatal exception [ 27.044049] Dumping ftrace buffer: [ 27.047561] (ftrace buffer empty) [ 27.051239] Kernel Offset: disabled [ 27.054845] Rebooting in 86400 seconds..