[....] Starting enhanced syslogd: rsyslogd[ 10.185692] audit: type=1400 audit(1514405754.089:4): avc: denied { syslog } for pid=3172 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 '10.128.15.207' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.412330] kasan: CONFIG_KASAN_INLINE enabled [ 39.413057] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 39.414048] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.414885] Dumping ftrace buffer: [ 39.415375] (ftrace buffer empty) [ 39.415869] Modules linked in: [ 39.416335] CPU: 0 PID: 3338 Comm: syzkaller876117 Not tainted 4.9.72-gcb7518e #10 [ 39.417342] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.418561] task: ffff8801c94f9800 task.stack: ffff8801c7ec0000 [ 39.419368] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 39.420571] RSP: 0018:ffff8801c7ec7a50 EFLAGS: 00010a07 [ 39.421288] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 39.422237] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 39.423205] RBP: ffff8801c7ec7a60 R08: 0000000000000001 R09: 0000000000000000 [ 39.424156] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 39.425108] R13: 0000000000000020 R14: ffff8801c8be2100 R15: dffffc0000000000 [ 39.426061] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009617840 [ 39.427157] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.427947] CR2: 0000000020001000 CR3: 00000001c89e9000 CR4: 00000000001406f0 [ 39.428899] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.429902] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.430853] Stack: [ 39.431148] ffff8801c94f9800 ffff8801c8be2258 ffff8801c7ec7ac0 ffffffff82664fc1 [ 39.432295] ffff8801c8be2270 ffffed003917c44b ffffed003917c44e ffff8801c8be2268 [ 39.439329] dead4ead00000000 ffff8801c8be2240 0000000000000000 0000000000000000 [ 39.447743] Call Trace: [ 39.450300] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 39.456758] [] sg_finish_rem_req+0x2b5/0x340 [ 39.462779] [] sg_new_read.isra.20+0x39/0x3e0 [ 39.468897] [] ? sg_get_rq_mark+0x142/0x190 [ 39.474842] [] sg_read+0x8bd/0x1440 [ 39.480082] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 39.486725] [] ? lru_cache_add+0xd9/0x1e0 [ 39.492499] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 39.499562] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 39.506192] [] __vfs_read+0x103/0x670 [ 39.511606] [] ? default_llseek+0x290/0x290 [ 39.517553] [] ? fsnotify+0x86/0xf30 [ 39.522982] [] ? fsnotify+0xf30/0xf30 [ 39.528400] [] ? avc_policy_seqno+0x9/0x20 [ 39.534258] [] ? selinux_file_permission+0x82/0x460 [ 39.540896] [] ? security_file_permission+0x89/0x1e0 [ 39.547702] [] ? rw_verify_area+0xe5/0x2b0 [ 39.553552] [] vfs_read+0x11e/0x380 [ 39.558791] [] SyS_read+0xd9/0x1b0 [ 39.563948] [] ? vfs_copy_file_range+0x740/0x740 [ 39.570318] [] ? do_fast_syscall_32+0xcf/0x890 [ 39.576517] [] ? vfs_copy_file_range+0x740/0x740 [ 39.582888] [] do_fast_syscall_32+0x2f7/0x890 [ 39.588997] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.595632] [] entry_SYSENTER_compat+0x51/0x60 [ 39.601828] 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 [ 39.628175] RIP [] __free_pages+0x21/0x80 [ 39.634055] RSP [ 39.637982] ---[ end trace 5612def7c82f0e8f ]--- [ 39.642818] Kernel panic - not syncing: Fatal exception [ 39.648523] Dumping ftrace buffer: [ 39.652035] (ftrace buffer empty) [ 39.655712] Kernel Offset: disabled [ 39.659305] Rebooting in 86400 seconds..