[....] Starting enhanced syslogd: rsyslogd[ 13.166780] audit: type=1400 audit(1515450382.084:4): avc: denied { syslog } for pid=3173 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 '10.128.15.245' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.632513] kasan: CONFIG_KASAN_INLINE enabled [ 24.637140] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.644476] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 24.650686] Dumping ftrace buffer: [ 24.654191] (ftrace buffer empty) [ 24.657870] Modules linked in: [ 24.661143] CPU: 0 PID: 3329 Comm: syzkaller404407 Not tainted 4.9.75-gb54d99a #18 [ 24.668813] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.678138] task: ffff8801c9c21800 task.stack: ffff8801c1438000 [ 24.684160] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.692398] RSP: 0018:ffff8801c143f940 EFLAGS: 00010a07 [ 24.697812] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 24.705049] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 24.712284] RBP: ffff8801c143f950 R08: 0000000000000001 R09: 0000000000000000 [ 24.719522] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 24.726765] R13: 0000000000000020 R14: ffff8801c9342100 R15: dffffc0000000000 [ 24.734003] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000099b7840 [ 24.742194] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 24.748048] CR2: 0000000020ef0fe0 CR3: 00000001ca9a8000 CR4: 0000000000160670 [ 24.755288] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.762524] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.769762] Stack: [ 24.771878] ffff8801c9c21800 ffff8801c9342258 ffff8801c143f9b0 ffffffff82666341 [ 24.779830] ffff8801c9342270 ffffed003926844b ffffed003926844e ffff8801c9342268 [ 24.787783] dead4ead00000000 ffff8801c9342240 0000000000000000 0000000000000000 [ 24.795731] Call Trace: [ 24.798295] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.804752] [] sg_finish_rem_req+0x2b5/0x340 [ 24.810776] [] sg_new_read.isra.20+0x39/0x3e0 [ 24.816885] [] ? sg_get_rq_mark+0x142/0x190 [ 24.822824] [] sg_read+0x8bd/0x1440 [ 24.828069] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.834702] [] ? fsnotify+0xf30/0xf30 [ 24.840121] [] ? avc_policy_seqno+0x9/0x20 [ 24.845971] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 24.852950] [] ? security_file_permission+0x89/0x1e0 [ 24.859668] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.866308] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.872941] [] compat_do_readv_writev+0x522/0x760 [ 24.879399] [] ? do_pwritev+0x1a0/0x1a0 [ 24.884990] [] ? __lru_cache_add+0x187/0x250 [ 24.891017] [] ? _raw_spin_unlock+0x2c/0x50 [ 24.896955] [] ? handle_mm_fault+0x6ee/0x2530 [ 24.903063] [] ? __pmd_alloc+0x410/0x410 [ 24.908743] [] compat_readv+0xe3/0x150 [ 24.914248] [] do_compat_readv+0xf4/0x1d0 [ 24.920013] [] ? compat_readv+0x150/0x150 [ 24.925777] [] compat_SyS_readv+0x26/0x30 [ 24.931544] [] ? SyS_pwritev2+0x80/0x80 [ 24.937137] [] do_fast_syscall_32+0x2f7/0x890 [ 24.943258] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.949907] [] entry_SYSENTER_compat+0x74/0x83 [ 24.956105] 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 [ 24.982461] RIP [] __free_pages+0x21/0x80 [ 24.988345] RSP [ 24.992364] ---[ end trace 9e079b8ed1ea3f74 ]--- [ 24.997164] Kernel panic - not syncing: Fatal exception [ 25.002994] Dumping ftrace buffer: [ 25.006512] (ftrace buffer empty) [ 25.010210] Kernel Offset: disabled [ 25.013803] Rebooting in 86400 seconds..