[....] Starting enhanced syslogd: rsyslogd[ 12.496983] audit: type=1400 audit(1516471036.402:4): avc: denied { syslog } for pid=3168 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 19.574780] kasan: CONFIG_KASAN_INLINE enabled [ 19.580140] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.587538] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.593747] Dumping ftrace buffer: [ 19.597258] (ftrace buffer empty) [ 19.600937] Modules linked in: [ 19.604213] CPU: 0 PID: 3318 Comm: syzkaller034752 Not tainted 4.9.77-ge12a9c4 #18 [ 19.611887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.621213] task: ffff8801cb599800 task.stack: ffff8801ca148000 [ 19.627237] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.635466] RSP: 0018:ffff8801ca14f9b0 EFLAGS: 00010a07 [ 19.640880] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266751b [ 19.648120] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 19.655358] RBP: ffff8801ca14f9c0 R08: 0000000048000000 R09: 0000000000001e30 [ 19.662601] R10: 0000000000002100 R11: ffff8801cb599800 R12: 0000000000000004 [ 19.669848] R13: 0000000000000020 R14: ffff8801cd2dc200 R15: dffffc0000000000 [ 19.677087] FS: 00007f6d22816700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 19.685282] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.691140] CR2: 0000000020a13000 CR3: 00000001c8cd2000 CR4: 0000000000160670 [ 19.698381] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.705620] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.712856] Stack: [ 19.714974] 0000000000000001 ffff8801cd2dc358 ffff8801ca14fa20 ffffffff82667541 [ 19.722945] ffff8801cd2dc370 ffffed0039a5b86b ffffed0039a5b86e ffff8801cd2dc368 [ 19.730909] dead4ead00000000 ffff8801cd2dc340 0000000000000000 0000000000000000 [ 19.738877] Call Trace: [ 19.741439] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.747901] [] sg_finish_rem_req+0x2b5/0x340 [ 19.753926] [] sg_new_read.isra.20+0x18d/0x3e0 [ 19.760128] [] sg_read+0x8bd/0x1440 [ 19.765374] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.772010] [] ? fsnotify+0xf30/0xf30 [ 19.777431] [] ? avc_policy_seqno+0x9/0x20 [ 19.783290] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.790273] [] ? security_file_permission+0x89/0x1e0 [ 19.796996] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.803631] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.810267] [] do_readv_writev+0x520/0x750 [ 19.816118] [] ? vfs_write+0x530/0x530 [ 19.821626] [] ? check_preemption_disabled+0x3b/0x200 [ 19.828434] [] ? __fget+0x201/0x3a0 [ 19.833689] [] ? __fget+0x228/0x3a0 [ 19.838933] [] ? __fget+0x47/0x3a0 [ 19.844088] [] vfs_readv+0x84/0xc0 [ 19.849244] [] do_readv+0xe6/0x250 [ 19.854402] [] ? vfs_readv+0xc0/0xc0 [ 19.859735] [] ? entry_SYSCALL_64_fastpath+0x5/0xe8 [ 19.866373] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.873180] [] SyS_readv+0x27/0x30 [ 19.878336] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 19.884880] 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 [ 19.911419] RIP [] __free_pages+0x21/0x80 [ 19.917304] RSP [ 19.921191] ---[ end trace 649c44311da9f384 ]--- [ 19.925959] Kernel panic - not syncing: Fatal exception [ 19.931694] Dumping ftrace buffer: [ 19.935220] (ftrace buffer empty) [ 19.938897] Kernel Offset: disabled [ 19.942492] Rebooting in 86400 seconds..