[....] Starting enhanced syslogd: rsyslogd[ 13.117568] audit: type=1400 audit(1514554461.680:4): avc: denied { syslog } for pid=3178 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.0.56' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.090575] kasan: CONFIG_KASAN_INLINE enabled [ 53.095241] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 53.102608] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.108810] Dumping ftrace buffer: [ 53.112315] (ftrace buffer empty) [ 53.115994] Modules linked in: [ 53.119273] CPU: 0 PID: 3350 Comm: syzkaller444458 Not tainted 4.9.72-gcb7518e #10 [ 53.126965] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.136287] task: ffff8801c9edc800 task.stack: ffff8801cdba0000 [ 53.142318] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 53.150547] RSP: 0018:ffff8801cdba7a50 EFLAGS: 00010a07 [ 53.155962] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 53.163460] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 53.173232] RBP: ffff8801cdba7a60 R08: 0000000000000001 R09: 0000000000000000 [ 53.180740] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 53.187980] R13: 0000000000000020 R14: ffff8801c7068000 R15: dffffc0000000000 [ 53.195227] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008a56840 [ 53.203421] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 53.209276] CR2: 0000000020001000 CR3: 00000001c818f000 CR4: 00000000001406f0 [ 53.216516] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.223753] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.231685] Stack: [ 53.233800] ffff8801c9edc800 ffff8801c7068158 ffff8801cdba7ac0 ffffffff82664fc1 [ 53.241750] ffff8801c7068170 ffffed0038e0d02b ffffed0038e0d02e ffff8801c7068168 [ 53.249702] dead4ead00000000 ffff8801c7068140 0000000000000000 0000000000000000 [ 53.257658] Call Trace: [ 53.260217] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 53.266676] [] sg_finish_rem_req+0x2b5/0x340 [ 53.272713] [] sg_new_read.isra.20+0x39/0x3e0 [ 53.278832] [] ? sg_get_rq_mark+0x142/0x190 [ 53.284769] [] sg_read+0x8bd/0x1440 [ 53.290015] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 53.296653] [] ? lru_cache_add+0xd9/0x1e0 [ 53.302423] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 53.309493] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 53.316125] [] __vfs_read+0x103/0x670 [ 53.321543] [] ? default_llseek+0x290/0x290 [ 53.327494] [] ? fsnotify+0x86/0xf30 [ 53.332823] [] ? fsnotify+0xf30/0xf30 [ 53.338241] [] ? avc_policy_seqno+0x9/0x20 [ 53.344090] [] ? selinux_file_permission+0x82/0x460 [ 53.350737] [] ? security_file_permission+0x89/0x1e0 [ 53.357466] [] ? rw_verify_area+0xe5/0x2b0 [ 53.363318] [] vfs_read+0x11e/0x380 [ 53.368561] [] SyS_read+0xd9/0x1b0 [ 53.373727] [] ? vfs_copy_file_range+0x740/0x740 [ 53.380104] [] ? do_fast_syscall_32+0xcf/0x890 [ 53.386308] [] ? vfs_copy_file_range+0x740/0x740 [ 53.392690] [] do_fast_syscall_32+0x2f7/0x890 [ 53.398804] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.405440] [] entry_SYSENTER_compat+0x51/0x60 [ 53.411639] 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 [ 53.437976] RIP [] __free_pages+0x21/0x80 [ 53.443887] RSP [ 53.447984] ---[ end trace 19489a6f4b0332c1 ]--- [ 53.452735] Kernel panic - not syncing: Fatal exception [ 53.458444] Dumping ftrace buffer: [ 53.461955] (ftrace buffer empty) [ 53.465635] Kernel Offset: disabled [ 53.469229] Rebooting in 86400 seconds..