[....] Starting enhanced syslogd: rsyslogd[ 13.194864] audit: type=1400 audit(1520709243.444:4): avc: denied { syslog } for pid=3651 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 '10.128.10.14' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: File exists RTNETLINK answers: File exists 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" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth1" Cannot find device "veth1" Cannot find device "veth1" Cannot find device "veth1" executing program executing program syzkaller login: [ 26.909578] sg_write: data in/out 144144/315 bytes for SCSI command 0x6a-- guessing data in; [ 26.909578] program syzkaller672704 not setting count and/or reply_len properly [ 26.929274] kasan: CONFIG_KASAN_INLINE enabled [ 26.934247] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.941607] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.947814] Dumping ftrace buffer: [ 26.951320] (ftrace buffer empty) [ 26.955000] Modules linked in: [ 26.958278] CPU: 1 PID: 3807 Comm: syzkaller672704 Not tainted 4.9.86-g00db063 #52 [ 26.965951] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.975274] task: ffff8801d8a46000 task.stack: ffff8801b1c78000 [ 26.981298] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.989530] RSP: 0018:ffff8801b1c7f940 EFLAGS: 00010a07 [ 26.994962] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668edb [ 27.002201] RDX: 1bd5a9d5a0000003 RSI: 0000000000000005 RDI: dead4ead0000001c [ 27.009441] RBP: ffff8801b1c7f950 R08: 0000000048000000 R09: 0000000000001e30 [ 27.016679] R10: 0000000000002100 R11: ffff8801d8a46000 R12: 0000000000000004 [ 27.023919] R13: 0000000000000020 R14: ffff8801d53b2100 R15: dffffc0000000000 [ 27.031160] FS: 0000000001188880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.039353] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.045204] CR2: 0000000020e94000 CR3: 00000001d87f6000 CR4: 0000000000160670 [ 27.052444] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.059682] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.066922] Stack: [ 27.069041] 0000000000000001 ffff8801d53b2258 ffff8801b1c7f9b0 ffffffff82668f01 [ 27.077006] ffff8801d53b2270 ffffed003aa7644b ffffed003aa7644e ffff8801d53b2268 [ 27.084978] dead4ead00000000 ffff8801d53b2240 0000000000000000 0000000000000000 [ 27.092937] Call Trace: [ 27.095495] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.101956] [] sg_finish_rem_req+0x2b5/0x340 [ 27.107983] [] sg_new_read.isra.20+0x18d/0x3e0 [ 27.114183] [] sg_read+0x8b7/0x1440 [ 27.119454] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.126091] [] ? fsnotify+0x86/0xf30 [ 27.131422] [] ? fsnotify+0xf30/0xf30 [ 27.136841] [] ? avc_policy_seqno+0x9/0x20 [ 27.142697] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 27.149591] [] do_readv_writev+0x5fd/0x740 [ 27.155443] [] ? vfs_write+0x530/0x530 [ 27.160950] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.167844] [] ? sg_ioctl+0x2a00/0x2a00 [ 27.173434] [] ? do_iter_readv_writev+0x4b0/0x4b0 [ 27.179895] [] ? __might_sleep+0x95/0x1a0 [ 27.185661] [] ? __inode_security_revalidate+0xd9/0x130 [ 27.192641] [] ? __fsnotify_parent+0xbc/0x340 [ 27.198755] [] ? avc_policy_seqno+0x9/0x20 [ 27.204605] [] ? fsnotify+0x86/0xf30 [ 27.209934] [] ? fsnotify+0xf30/0xf30 [ 27.215351] [] vfs_readv+0x84/0xc0 [ 27.220506] [] do_readv+0xe6/0x250 [ 27.225664] [] ? vfs_readv+0xc0/0xc0 [ 27.230999] [] ? SyS_read+0x1b0/0x1b0 [ 27.236416] [] SyS_readv+0x27/0x30 [ 27.241572] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 27.248118] [] do_syscall_64+0x1a4/0x490 [ 27.253799] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.260688] 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 [ 27.287269] RIP [] __free_pages+0x21/0x80 [ 27.293150] RSP [ 27.297095] ---[ end trace dfb23d50342a5879 ]--- [ 27.301829] Kernel panic - not syncing: Fatal exception [ 27.307604] Dumping ftrace buffer: [ 27.311116] (ftrace buffer empty) [ 27.314795] Kernel Offset: disabled [ 27.318388] Rebooting in 86400 seconds..