[....] Starting enhanced syslogd: rsyslogd[ 11.839502] audit: type=1400 audit(1514763537.208:4): avc: denied { syslog } for pid=3164 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.022240] kasan: CONFIG_KASAN_INLINE enabled [ 33.022941] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.023942] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.024763] Dumping ftrace buffer: [ 33.025234] (ftrace buffer empty) [ 33.025745] Modules linked in: [ 33.026209] CPU: 1 PID: 3333 Comm: syzkaller694128 Not tainted 4.9.73-gf3f3457 #11 [ 33.027214] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.028464] task: ffff8801cd39b000 task.stack: ffff8801c85f8000 [ 33.029292] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 33.030423] RSP: 0018:ffff8801c85ffa50 EFLAGS: 00010a07 [ 33.031138] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 33.032104] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 33.033057] RBP: ffff8801c85ffa60 R08: 0000000000000001 R09: 0000000000000000 [ 33.034027] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 33.034995] R13: 0000000000000020 R14: ffff8801c79e8000 R15: dffffc0000000000 [ 33.035974] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008e17840 [ 33.037062] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.037835] CR2: 0000000020001000 CR3: 00000001c8d5b000 CR4: 00000000001406e0 [ 33.038820] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.039769] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.040716] Stack: [ 33.041023] ffff8801cd39b000 ffff8801c79e8158 ffff8801c85ffac0 ffffffff82664fc1 [ 33.042149] ffff8801c79e8170 ffffed0038f3d02b ffffed0038f3d02e ffff8801c79e8168 [ 33.048975] dead4ead00000000 ffff8801c79e8140 0000000000000000 0000000000000000 [ 33.056923] Call Trace: [ 33.059480] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 33.065936] [] sg_finish_rem_req+0x2b5/0x340 [ 33.071956] [] sg_new_read.isra.20+0x39/0x3e0 [ 33.078065] [] ? sg_get_rq_mark+0x142/0x190 [ 33.083999] [] sg_read+0x8bd/0x1440 [ 33.089238] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 33.095867] [] ? lru_cache_add+0xd9/0x1e0 [ 33.101628] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 33.108690] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 33.115320] [] __vfs_read+0x103/0x670 [ 33.120731] [] ? default_llseek+0x290/0x290 [ 33.126665] [] ? fsnotify+0x86/0xf30 [ 33.131992] [] ? fsnotify+0xf30/0xf30 [ 33.137408] [] ? avc_policy_seqno+0x9/0x20 [ 33.143258] [] ? selinux_file_permission+0x82/0x460 [ 33.149893] [] ? security_file_permission+0x89/0x1e0 [ 33.156607] [] ? rw_verify_area+0xe5/0x2b0 [ 33.162456] [] vfs_read+0x11e/0x380 [ 33.167697] [] SyS_read+0xd9/0x1b0 [ 33.172848] [] ? vfs_copy_file_range+0x740/0x740 [ 33.179220] [] ? do_fast_syscall_32+0xcf/0x890 [ 33.185416] [] ? vfs_copy_file_range+0x740/0x740 [ 33.191784] [] do_fast_syscall_32+0x2f7/0x890 [ 33.197897] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.204539] [] entry_SYSENTER_compat+0x51/0x60 [ 33.210734] 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 [ 33.236954] RIP [] __free_pages+0x21/0x80 [ 33.242826] RSP [ 33.246624] ---[ end trace 55ce7ebfa87860ce ]--- [ 33.253055] Kernel panic - not syncing: Fatal exception [ 33.258421] Dumping ftrace buffer: [ 33.261925] (ftrace buffer empty) [ 33.265598] Kernel Offset: disabled [ 33.269190] Rebooting in 86400 seconds..