[....] Starting enhanced syslogd: rsyslogd[ 13.103591] audit: type=1400 audit(1514405157.718:4): avc: denied { syslog } for pid=3179 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 '10.128.0.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.054383] kasan: CONFIG_KASAN_INLINE enabled [ 24.059069] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.066405] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 24.072602] Dumping ftrace buffer: [ 24.076107] (ftrace buffer empty) [ 24.079782] Modules linked in: [ 24.083051] CPU: 0 PID: 3335 Comm: syzkaller333154 Not tainted 4.9.72-gcb7518e #10 [ 24.090725] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.100066] task: ffff8801ca6a4800 task.stack: ffff8801c90d0000 [ 24.106091] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.114319] RSP: 0018:ffff8801c90d7a50 EFLAGS: 00010a07 [ 24.119731] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 24.126966] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 24.134198] RBP: ffff8801c90d7a60 R08: 0000000000000001 R09: 0000000000000000 [ 24.141432] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 24.148669] R13: 0000000000000020 R14: ffff8801d06d2100 R15: dffffc0000000000 [ 24.155907] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000973d840 [ 24.164096] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 24.169942] CR2: 0000000020001000 CR3: 00000001c8eca000 CR4: 00000000001406f0 [ 24.177179] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.184415] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.191652] Stack: [ 24.193768] ffff8801ca6a4800 ffff8801d06d2258 ffff8801c90d7ac0 ffffffff82664fc1 [ 24.201722] ffff8801d06d2270 ffffed003a0da44b ffffed003a0da44e ffff8801d06d2268 [ 24.209671] dead4ead00000000 ffff8801d06d2240 0000000000000000 0000000000000000 [ 24.217619] Call Trace: [ 24.220176] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.226633] [] sg_finish_rem_req+0x2b5/0x340 [ 24.232672] [] sg_new_read.isra.20+0x39/0x3e0 [ 24.238794] [] ? sg_get_rq_mark+0x142/0x190 [ 24.244731] [] sg_read+0x8bd/0x1440 [ 24.249972] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.256603] [] ? lru_cache_add+0xd9/0x1e0 [ 24.262371] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 24.269435] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.276066] [] __vfs_read+0x103/0x670 [ 24.281483] [] ? default_llseek+0x290/0x290 [ 24.287420] [] ? fsnotify+0x86/0xf30 [ 24.292748] [] ? fsnotify+0xf30/0xf30 [ 24.298164] [] ? avc_policy_seqno+0x9/0x20 [ 24.304016] [] ? selinux_file_permission+0x82/0x460 [ 24.310651] [] ? security_file_permission+0x89/0x1e0 [ 24.317371] [] ? rw_verify_area+0xe5/0x2b0 [ 24.323221] [] vfs_read+0x11e/0x380 [ 24.328463] [] SyS_read+0xd9/0x1b0 [ 24.333618] [] ? vfs_copy_file_range+0x740/0x740 [ 24.339988] [] ? do_fast_syscall_32+0xcf/0x890 [ 24.346184] [] ? vfs_copy_file_range+0x740/0x740 [ 24.352552] [] do_fast_syscall_32+0x2f7/0x890 [ 24.358662] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.365296] [] entry_SYSENTER_compat+0x51/0x60 [ 24.371490] 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 [ 24.397841] RIP [] __free_pages+0x21/0x80 [ 24.403723] RSP [ 24.407614] ---[ end trace a43277e47b88b4f4 ]--- [ 24.412439] Kernel panic - not syncing: Fatal exception [ 24.417824] Dumping ftrace buffer: [ 24.421347] (ftrace buffer empty) [ 24.425026] Kernel Offset: disabled [ 24.428620] Rebooting in 86400 seconds..