[....] Starting enhanced syslogd: rsyslogd[ 10.352581] audit: type=1400 audit(1514470419.423:4): avc: denied { syslog } for pid=3167 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 '10.128.15.221' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 21.382610] kasan: CONFIG_KASAN_INLINE enabled [ 21.383284] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 21.384263] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 21.385102] Dumping ftrace buffer: [ 21.385591] (ftrace buffer empty) [ 21.386085] Modules linked in: [ 21.386550] CPU: 0 PID: 3329 Comm: syzkaller971447 Not tainted 4.9.72-gcb7518e #10 [ 21.387572] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.388789] task: ffff8801c9538000 task.stack: ffff8801c8180000 [ 21.389584] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 21.390710] RSP: 0018:ffff8801c8187a50 EFLAGS: 00010a07 [ 21.391456] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 21.392429] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 21.393380] RBP: ffff8801c8187a60 R08: 0000000000000001 R09: 0000000000000000 [ 21.394362] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 21.395316] R13: 0000000000000020 R14: ffff8801c8190000 R15: dffffc0000000000 [ 21.396284] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000096b2840 [ 21.397358] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 21.398132] CR2: 0000000020001000 CR3: 00000001c9f68000 CR4: 00000000001406f0 [ 21.399139] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.400101] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.401050] Stack: [ 21.401374] ffff8801c9538000 ffff8801c8190158 ffff8801c8187ac0 ffffffff82664fc1 [ 21.402564] ffff8801c8190170 ffffed003903202b ffffed003903202e ffff8801c8190168 [ 21.409727] dead4ead00000000 ffff8801c8190140 0000000000000000 0000000000000000 [ 21.417676] Call Trace: [ 21.420230] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 21.426704] [] sg_finish_rem_req+0x2b5/0x340 [ 21.432744] [] sg_new_read.isra.20+0x39/0x3e0 [ 21.438851] [] ? sg_get_rq_mark+0x142/0x190 [ 21.444786] [] sg_read+0x8bd/0x1440 [ 21.450027] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.456658] [] ? lru_cache_add+0xd9/0x1e0 [ 21.462421] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 21.469494] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.476131] [] __vfs_read+0x103/0x670 [ 21.481545] [] ? default_llseek+0x290/0x290 [ 21.487489] [] ? fsnotify+0x86/0xf30 [ 21.492816] [] ? fsnotify+0xf30/0xf30 [ 21.498232] [] ? avc_policy_seqno+0x9/0x20 [ 21.504081] [] ? selinux_file_permission+0x82/0x460 [ 21.510718] [] ? security_file_permission+0x89/0x1e0 [ 21.517432] [] ? rw_verify_area+0xe5/0x2b0 [ 21.523280] [] vfs_read+0x11e/0x380 [ 21.528524] [] SyS_read+0xd9/0x1b0 [ 21.533678] [] ? vfs_copy_file_range+0x740/0x740 [ 21.540048] [] ? do_fast_syscall_32+0xcf/0x890 [ 21.546242] [] ? vfs_copy_file_range+0x740/0x740 [ 21.552610] [] do_fast_syscall_32+0x2f7/0x890 [ 21.558720] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.565354] [] entry_SYSENTER_compat+0x51/0x60 [ 21.571547] 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 [ 21.597990] RIP [] __free_pages+0x21/0x80 [ 21.603863] RSP [ 21.607615] ---[ end trace 5cd873e4e2efe00a ]--- [ 21.612352] Kernel panic - not syncing: Fatal exception [ 21.617713] Dumping ftrace buffer: [ 21.621220] (ftrace buffer empty) [ 21.624895] Kernel Offset: disabled [ 21.628488] Rebooting in 86400 seconds..