[....] Starting enhanced syslogd: rsyslogd[ 12.245722] audit: type=1400 audit(1519687181.083:4): avc: denied { syslog } for pid=3635 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 '10.128.0.51' (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" syzkaller login: [ 20.990067] ip (3901) used greatest stack depth: 24480 bytes left 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 [ 21.385956] kasan: CONFIG_KASAN_INLINE enabled [ 21.390548] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 21.398222] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 21.404456] Dumping ftrace buffer: [ 21.407972] (ftrace buffer empty) [ 21.411650] Modules linked in: [ 21.414928] CPU: 0 PID: 3784 Comm: syzkaller727536 Not tainted 4.9.84-ga9d0273 #44 [ 21.422600] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.431923] task: ffff8801b7656000 task.stack: ffff8801ca418000 [ 21.437945] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 21.446178] RSP: 0018:ffff8801ca41f950 EFLAGS: 00010a07 [ 21.451606] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668dfb [ 21.458846] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 21.466091] RBP: ffff8801ca41f960 R08: 0000000048000000 R09: 0000000000001e30 [ 21.473331] R10: 0000000000002100 R11: ffff8801b7656000 R12: 0000000000000004 [ 21.480570] R13: 0000000000000020 R14: ffff8801d7d0c200 R15: dffffc0000000000 [ 21.487816] FS: 00000000022a8880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 21.496021] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.501870] CR2: 0000000020e94000 CR3: 00000001d8e68000 CR4: 0000000000160670 [ 21.509110] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.516350] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.523596] Stack: [ 21.525717] 0000000000000001 ffff8801d7d0c358 ffff8801ca41f9c0 ffffffff82668e21 [ 21.533689] ffff8801d7d0c370 ffffed003afa186b ffffed003afa186e ffff8801d7d0c368 [ 21.541664] dead4ead00000000 ffff8801d7d0c340 0000000000000000 0000000000000000 [ 21.549633] Call Trace: [ 21.552194] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 21.558655] [] sg_finish_rem_req+0x2b5/0x340 [ 21.564683] [] sg_new_read.isra.20+0x18d/0x3e0 [ 21.570882] [] sg_read+0x8b7/0x1440 [ 21.576126] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 21.582758] [] ? fsnotify+0xf30/0xf30 [ 21.588179] [] ? avc_policy_seqno+0x9/0x20 [ 21.594037] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 21.601019] [] ? security_file_permission+0x89/0x1e0 [ 21.607741] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 21.614374] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 21.621007] [] do_readv_writev+0x520/0x750 [ 21.626857] [] ? vfs_write+0x530/0x530 [ 21.632364] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 21.639256] [] ? sg_ioctl+0x2a00/0x2a00 [ 21.644856] [] ? do_iter_readv_writev+0x400/0x400 [ 21.651318] [] ? __might_sleep+0x95/0x1a0 [ 21.657083] [] ? __inode_security_revalidate+0xd9/0x130 [ 21.664064] [] ? __fsnotify_parent+0xbc/0x340 [ 21.670176] [] ? avc_policy_seqno+0x9/0x20 [ 21.676027] [] ? fsnotify+0x86/0xf30 [ 21.681357] [] ? fsnotify+0xf30/0xf30 [ 21.686774] [] vfs_readv+0x84/0xc0 [ 21.691930] [] do_readv+0xe6/0x250 [ 21.697088] [] ? vfs_readv+0xc0/0xc0 [ 21.702428] [] ? SyS_read+0x1b0/0x1b0 [ 21.707847] [] SyS_readv+0x27/0x30 [ 21.713004] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 21.719553] [] do_syscall_64+0x1a4/0x490 [ 21.725232] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 21.732120] 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 [ 21.758690] RIP [] __free_pages+0x21/0x80 [ 21.764575] RSP [ 21.768619] ---[ end trace c2e9e5edd9e5b421 ]--- [ 21.773356] Kernel panic - not syncing: Fatal exception [ 21.779095] Dumping ftrace buffer: [ 21.782605] (ftrace buffer empty) [ 21.786291] Kernel Offset: disabled [ 21.789891] Rebooting in 86400 seconds..