[....] Starting enhanced syslogd: rsyslogd[ 15.698038] audit: type=1400 audit(1518415578.620:4): avc: denied { syslog } for pid=3650 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 '10.128.15.222' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 29.708404] kasan: CONFIG_KASAN_INLINE enabled [ 29.712464] kasan: CONFIG_KASAN_INLINE enabled [ 29.712466] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.712477] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.712481] Dumping ftrace buffer: [ 29.712484] (ftrace buffer empty) [ 29.712492] Modules linked in: [ 29.712500] CPU: 1 PID: 3819 Comm: syzkaller967086 Not tainted 4.9.80-g8a174b47 #31 [ 29.712503] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.712508] task: ffff8801b50a3000 task.stack: ffff8801d9908000 [ 29.712525] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 29.712528] RSP: 0018:ffff8801d990f9b0 EFLAGS: 00010a07 [ 29.712532] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826680eb [ 29.712536] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 29.712539] RBP: ffff8801d990f9c0 R08: 0000000048000000 R09: 0000000000001e30 [ 29.712543] R10: 0000000000002100 R11: ffff8801b50a3000 R12: 0000000000000004 [ 29.712546] R13: 0000000000000020 R14: ffff8801b9d34200 R15: dffffc0000000000 [ 29.712551] FS: 00007f0d70835700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.712555] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.712558] CR2: 0000000020a13000 CR3: 00000001b5bd4000 CR4: 0000000000160670 [ 29.712565] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.712568] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.712569] Stack: [ 29.712579] 0000000000000001 ffff8801b9d34358 ffff8801d990fa20 ffffffff82668111 [ 29.712588] ffff8801b9d34370 ffffed00373a686b ffffed00373a686e ffff8801b9d34368 [ 29.712595] dead4ead00000000 ffff8801b9d34340 0000000000000000 0000000000000000 [ 29.712597] Call Trace: [ 29.712607] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 29.712613] [] sg_finish_rem_req+0x2b5/0x340 [ 29.712620] [] sg_new_read.isra.20+0x18d/0x3e0 [ 29.712626] [] sg_read+0x8b7/0x1440 [ 29.712633] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 29.712640] [] ? fsnotify+0xf30/0xf30 [ 29.712649] [] ? avc_policy_seqno+0x9/0x20 [ 29.712659] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 29.712665] [] ? security_file_permission+0x89/0x1e0 [ 29.712672] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 29.712679] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 29.712685] [] do_readv_writev+0x520/0x750 [ 29.712692] [] ? vfs_write+0x530/0x530 [ 29.712700] [] ? __fget+0x201/0x3a0 [ 29.712706] [] ? __fget+0x228/0x3a0 [ 29.712711] [] ? __fget+0x47/0x3a0 [ 29.712718] [] vfs_readv+0x84/0xc0 [ 29.712724] [] do_readv+0xe6/0x250 [ 29.712731] [] ? vfs_readv+0xc0/0xc0 [ 29.712739] [] ? entry_SYSCALL_64_fastpath+0x5/0xe8 [ 29.712752] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.712759] [] SyS_readv+0x27/0x30 [ 29.712765] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 29.712862] 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 [ 29.712868] RIP [] __free_pages+0x21/0x80 [ 29.712871] RSP [ 29.712959] ---[ end trace 8788f8d2cc85fff8 ]--- [ 29.712962] Kernel panic - not syncing: Fatal exception [ 29.713449] Dumping ftrace buffer: [ 29.713451] (ftrace buffer empty) [ 29.713453] Kernel Offset: disabled [ 30.063362] Rebooting in 86400 seconds..