[....] Starting enhanced syslogd: rsyslogd[ 13.652303] audit: type=1400 audit(1516380390.281:4): avc: denied { syslog } for pid=3176 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 '10.128.0.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.453694] kasan: CONFIG_KASAN_INLINE enabled [ 25.458291] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.465685] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 25.471890] Dumping ftrace buffer: [ 25.475401] (ftrace buffer empty) [ 25.479081] Modules linked in: [ 25.482362] CPU: 0 PID: 3331 Comm: syzkaller239976 Not tainted 4.9.77-g9c3804b #17 [ 25.490043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.499367] task: ffff8801cbb04800 task.stack: ffff8801c8068000 [ 25.505389] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 25.513626] RSP: 0018:ffff8801c806fab0 EFLAGS: 00010a07 [ 25.519045] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266751b [ 25.526283] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 25.533521] RBP: ffff8801c806fac0 R08: 0000000000000001 R09: 0000000000000001 [ 25.540760] R10: 0000000000000000 R11: ffff8801cbb04800 R12: 0000000000000004 [ 25.548720] R13: 0000000000000020 R14: ffff8801c8eec200 R15: dffffc0000000000 [ 25.555961] FS: 0000000001090880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.564158] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.570009] CR2: 00000000205c6000 CR3: 00000001cc416000 CR4: 0000000000160670 [ 25.577252] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.584503] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.591741] Stack: [ 25.593860] ffffffff838b3729 ffff8801c8eec358 ffff8801c806fb20 ffffffff82667541 [ 25.601831] ffff8801c8eec370 ffffed00391dd86b ffffed00391dd86e ffff8801c8eec368 [ 25.609803] dead4ead00000000 ffff8801c8eec340 0000000000000000 0000000000000000 [ 25.617772] Call Trace: [ 25.620679] [] ? retint_kernel+0x2d/0x2d [ 25.626361] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 25.632822] [] sg_finish_rem_req+0x2b5/0x340 [ 25.638848] [] sg_new_read.isra.20+0x356/0x3e0 [ 25.645050] [] ? sg_get_rq_mark+0xdb/0x190 [ 25.650903] [] sg_read+0x8bd/0x1440 [ 25.656150] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.662801] [] ? __lru_cache_add+0x187/0x250 [ 25.668826] [] ? lru_cache_add+0xd9/0x1e0 [ 25.674595] [] ? handle_mm_fault+0xb12/0x2530 [ 25.680717] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.687354] [] __vfs_read+0x103/0x670 [ 25.692771] [] ? default_llseek+0x290/0x290 [ 25.698718] [] ? fsnotify+0x86/0xf30 [ 25.704051] [] ? fsnotify+0xf30/0xf30 [ 25.709470] [] ? avc_policy_seqno+0x9/0x20 [ 25.715322] [] ? selinux_file_permission+0x82/0x460 [ 25.721956] [] ? security_file_permission+0x89/0x1e0 [ 25.728685] [] ? rw_verify_area+0xe5/0x2b0 [ 25.734538] [] vfs_read+0x11e/0x380 [ 25.739802] [] SyS_read+0xd9/0x1b0 [ 25.744966] [] ? vfs_copy_file_range+0x740/0x740 [ 25.751353] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 25.758161] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.765056] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 25.772121] 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 [ 25.799409] RIP [] __free_pages+0x21/0x80 [ 25.805292] RSP [ 25.810077] ---[ end trace 6ef406e13211da43 ]--- [ 25.815096] Kernel panic - not syncing: Fatal exception [ 25.821163] Dumping ftrace buffer: [ 25.825027] (ftrace buffer empty) [ 25.828708] Kernel Offset: disabled [ 25.832309] Rebooting in 86400 seconds..