[....] Starting enhanced syslogd: rsyslogd[ 10.196134] audit: type=1400 audit(1514393537.237:4): avc: denied { syslog } for pid=3173 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.15.231' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 21.849548] kasan: CONFIG_KASAN_INLINE enabled [ 21.850256] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 21.851251] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 21.852069] Dumping ftrace buffer: [ 21.852541] (ftrace buffer empty) [ 21.853035] Modules linked in: [ 21.853505] CPU: 1 PID: 3328 Comm: syzkaller608428 Not tainted 4.9.72-gcb7518e #10 [ 21.854510] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.855729] task: ffff8801ccb58000 task.stack: ffff8801c8830000 [ 21.856523] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 21.857631] RSP: 0018:ffff8801c8837a50 EFLAGS: 00010a07 [ 21.858378] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 21.859364] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 21.860313] RBP: ffff8801c8837a60 R08: 0000000000000001 R09: 0000000000000000 [ 21.861267] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 21.862217] R13: 0000000000000020 R14: ffff8801c95d2100 R15: dffffc0000000000 [ 21.863218] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009c67840 [ 21.864321] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 21.865116] CR2: 0000000020001000 CR3: 00000001c9646000 CR4: 00000000001406e0 [ 21.866144] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.867117] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.868081] Stack: [ 21.868376] ffff8801ccb58000 ffff8801c95d2258 ffff8801c8837ac0 ffffffff82664fc1 [ 21.869502] ffff8801c95d2270 ffffed00392ba44b ffffed00392ba44e ffff8801c95d2268 [ 21.876639] dead4ead00000000 ffff8801c95d2240 0000000000000000 0000000000000000 [ 21.884576] Call Trace: [ 21.887128] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 21.893581] [] sg_finish_rem_req+0x2b5/0x340 [ 21.899601] [] sg_new_read.isra.20+0x39/0x3e0 [ 21.905709] [] ? sg_get_rq_mark+0x142/0x190 [ 21.911642] [] sg_read+0x8bd/0x1440 [ 21.916880] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.923511] [] ? lru_cache_add+0xd9/0x1e0 [ 21.929272] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 21.936338] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.942967] [] __vfs_read+0x103/0x670 [ 21.948381] [] ? default_llseek+0x290/0x290 [ 21.954315] [] ? fsnotify+0x86/0xf30 [ 21.959644] [] ? fsnotify+0xf30/0xf30 [ 21.965060] [] ? avc_policy_seqno+0x9/0x20 [ 21.970909] [] ? selinux_file_permission+0x82/0x460 [ 21.977537] [] ? security_file_permission+0x89/0x1e0 [ 21.984256] [] ? rw_verify_area+0xe5/0x2b0 [ 21.990102] [] vfs_read+0x11e/0x380 [ 21.995341] [] SyS_read+0xd9/0x1b0 [ 22.000504] [] ? vfs_copy_file_range+0x740/0x740 [ 22.006888] [] ? do_fast_syscall_32+0xcf/0x890 [ 22.013084] [] ? vfs_copy_file_range+0x740/0x740 [ 22.019452] [] do_fast_syscall_32+0x2f7/0x890 [ 22.025560] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 22.032196] [] entry_SYSENTER_compat+0x51/0x60 [ 22.038389] 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 [ 22.064647] RIP [] __free_pages+0x21/0x80 [ 22.070533] RSP [ 22.074517] ---[ end trace 48ee7475bfba568a ]--- [ 22.079295] Kernel panic - not syncing: Fatal exception [ 22.085074] Dumping ftrace buffer: [ 22.088580] (ftrace buffer empty) [ 22.092266] Kernel Offset: disabled [ 22.095858] Rebooting in 86400 seconds..