[....] Starting enhanced syslogd: rsyslogd[ 13.031708] audit: type=1400 audit(1521032507.628:4): avc: denied { syslog } for pid=3647 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 '10.128.10.13' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 37.728071] kasan: CONFIG_KASAN_INLINE enabled [ 37.730021] kasan: CONFIG_KASAN_INLINE enabled [ 37.730022] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 37.730029] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.730032] Dumping ftrace buffer: [ 37.730035] (ftrace buffer empty) [ 37.730038] Modules linked in: [ 37.730043] CPU: 1 PID: 3815 Comm: syzkaller145358 Not tainted 4.9.87-g97d7f1c #54 [ 37.730045] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.730048] task: ffff8801b4f18000 task.stack: ffff8801d82d8000 [ 37.730059] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 37.730061] RSP: 0018:ffff8801d82df940 EFLAGS: 00010a07 [ 37.730064] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826692ab [ 37.730066] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 37.730068] RBP: ffff8801d82df950 R08: 0000000048000000 R09: 0000000000001e30 [ 37.730070] R10: 0000000000002100 R11: ffff8801b4f18000 R12: 0000000000000004 [ 37.730072] R13: 0000000000000020 R14: ffff8801d8e7c200 R15: dffffc0000000000 [ 37.730076] FS: 00007f96e926d700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.730078] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.730080] CR2: 00007f96e924be78 CR3: 00000001da368000 CR4: 0000000000160670 [ 37.730085] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.730087] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.730088] Stack: [ 37.730094] 0000000000000001 ffff8801d8e7c358 ffff8801d82df9b0 ffffffff826692d1 [ 37.730098] ffff8801d8e7c370 ffffed003b1cf86b ffffed003b1cf86e ffff8801d8e7c368 [ 37.730103] dead4ead00000000 ffff8801d8e7c340 0000000000000000 0000000000000000 [ 37.730104] Call Trace: [ 37.730111] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 37.730115] [] sg_finish_rem_req+0x2b5/0x340 [ 37.730119] [] sg_new_read.isra.20+0x18d/0x3e0 [ 37.730122] [] sg_read+0x8b7/0x1440 [ 37.730126] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 37.730130] [] ? fsnotify+0x86/0xf30 [ 37.730133] [] ? fsnotify+0xf30/0xf30 [ 37.730139] [] ? avc_policy_seqno+0x9/0x20 [ 37.730145] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 37.730149] [] do_readv_writev+0x5fd/0x740 [ 37.730153] [] ? vfs_write+0x530/0x530 [ 37.730158] [] ? exit_robust_list+0x230/0x230 [ 37.730162] [] ? __fget+0x20a/0x3b0 [ 37.730165] [] ? __fget+0x231/0x3b0 [ 37.730168] [] ? __fget+0x47/0x3b0 [ 37.730172] [] vfs_readv+0x84/0xc0 [ 37.730176] [] do_readv+0xe6/0x250 [ 37.730179] [] ? vfs_readv+0xc0/0xc0 [ 37.730183] [] ? SyS_fallocate+0x90/0x90 [ 37.730190] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 37.730194] [] SyS_readv+0x27/0x30 [ 37.730198] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 37.730203] [] do_syscall_64+0x1a4/0x490 [ 37.730209] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.730262] 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 [ 37.730266] RIP [] __free_pages+0x21/0x80 [ 37.730267] RSP [ 37.730273] ---[ end trace 2a2006e91e998dee ]--- [ 37.730276] Kernel panic - not syncing: Fatal exception [ 37.733035] Dumping ftrace buffer: [ 37.733037] (ftrace buffer empty) [ 37.733039] Kernel Offset: disabled [ 38.086619] Rebooting in 86400 seconds..