[....] Starting enhanced syslogd: rsyslogd[ 10.615286] audit: type=1400 audit(1514783736.239:4): avc: denied { syslog } for pid=3174 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 '10.128.0.33' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.746035] kasan: CONFIG_KASAN_INLINE enabled [ 26.746719] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.747717] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.748594] Dumping ftrace buffer: [ 26.749068] (ftrace buffer empty) [ 26.749663] Modules linked in: [ 26.750127] CPU: 1 PID: 3333 Comm: syzkaller294292 Not tainted 4.9.73-gf3f3457 #11 [ 26.751133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.752367] task: ffff8801c88be000 task.stack: ffff8801cb2d8000 [ 26.753160] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.754417] RSP: 0018:ffff8801cb2dfa50 EFLAGS: 00010a07 [ 26.755144] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 26.756110] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.757059] RBP: ffff8801cb2dfa60 R08: 0000000000000001 R09: 0000000000000000 [ 26.758008] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.758960] R13: 0000000000000020 R14: ffff8801c7d08000 R15: dffffc0000000000 [ 26.759925] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:000000000910f840 [ 26.760997] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.761770] CR2: 0000000020001000 CR3: 00000001caf27000 CR4: 00000000001406e0 [ 26.762733] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.763682] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.764640] Stack: [ 26.764957] ffff8801c88be000 ffff8801c7d08158 ffff8801cb2dfac0 ffffffff82664fc1 [ 26.766078] ffff8801c7d08170 ffffed0038fa102b ffffed0038fa102e ffff8801c7d08168 [ 26.771520] dead4ead00000000 ffff8801c7d08140 0000000000000000 0000000000000000 [ 26.779465] Call Trace: [ 26.782019] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.788473] [] sg_finish_rem_req+0x2b5/0x340 [ 26.794495] [] sg_new_read.isra.20+0x39/0x3e0 [ 26.800599] [] ? sg_get_rq_mark+0x142/0x190 [ 26.806534] [] sg_read+0x8bd/0x1440 [ 26.811774] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.818403] [] ? lru_cache_add+0xd9/0x1e0 [ 26.824338] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 26.831400] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.838027] [] __vfs_read+0x103/0x670 [ 26.843438] [] ? default_llseek+0x290/0x290 [ 26.849374] [] ? fsnotify+0x86/0xf30 [ 26.854701] [] ? fsnotify+0xf30/0xf30 [ 26.860114] [] ? avc_policy_seqno+0x9/0x20 [ 26.865961] [] ? selinux_file_permission+0x82/0x460 [ 26.872587] [] ? security_file_permission+0x89/0x1e0 [ 26.879301] [] ? rw_verify_area+0xe5/0x2b0 [ 26.885146] [] vfs_read+0x11e/0x380 [ 26.890386] [] SyS_read+0xd9/0x1b0 [ 26.895537] [] ? vfs_copy_file_range+0x740/0x740 [ 26.901904] [] ? do_fast_syscall_32+0xcf/0x890 [ 26.908095] [] ? vfs_copy_file_range+0x740/0x740 [ 26.914462] [] do_fast_syscall_32+0x2f7/0x890 [ 26.920582] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.927223] [] entry_SYSENTER_compat+0x51/0x60 [ 26.933417] 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 [ 26.959644] RIP [] __free_pages+0x21/0x80 [ 26.965519] RSP [ 26.969264] ---[ end trace 0cd4c91b2587cdd6 ]--- [ 26.973988] Kernel panic - not syncing: Fatal exception [ 26.979664] Dumping ftrace buffer: [ 26.983171] (ftrace buffer empty) [ 26.986848] Kernel Offset: disabled [ 26.990441] Rebooting in 86400 seconds..