[....] Starting enhanced syslogd: rsyslogd[ 10.969711] audit: type=1400 audit(1514670236.162:4): avc: denied { syslog } for pid=3175 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 '10.128.15.236' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 20.074558] kasan: CONFIG_KASAN_INLINE enabled [ 20.075358] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.076330] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.077151] Dumping ftrace buffer: [ 20.077626] (ftrace buffer empty) [ 20.078132] Modules linked in: [ 20.078619] CPU: 1 PID: 3324 Comm: syzkaller748683 Not tainted 4.9.73-gf3f3457 #11 [ 20.079629] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.080869] task: ffff8801ccb84800 task.stack: ffff8801c8bc0000 [ 20.081665] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.082795] RSP: 0018:ffff8801c8bc7a50 EFLAGS: 00010a07 [ 20.083513] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 20.084464] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 20.085415] RBP: ffff8801c8bc7a60 R08: 0000000000000001 R09: 0000000000000000 [ 20.086454] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 20.087526] R13: 0000000000000020 R14: ffff8801c88a8000 R15: dffffc0000000000 [ 20.088479] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009e1c840 [ 20.089643] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 20.090419] CR2: 0000000020001000 CR3: 00000001c8e83000 CR4: 00000000001406e0 [ 20.091383] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.092400] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.093416] Stack: [ 20.093747] ffff8801ccb84800 ffff8801c88a8158 ffff8801c8bc7ac0 ffffffff82664fc1 [ 20.096586] ffff8801c88a8170 ffffed003911502b ffffed003911502e ffff8801c88a8168 [ 20.104552] dead4ead00000000 ffff8801c88a8140 0000000000000000 0000000000000000 [ 20.112504] Call Trace: [ 20.115085] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.121555] [] sg_finish_rem_req+0x2b5/0x340 [ 20.127603] [] sg_new_read.isra.20+0x39/0x3e0 [ 20.133724] [] ? sg_get_rq_mark+0x142/0x190 [ 20.139663] [] sg_read+0x8bd/0x1440 [ 20.144921] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.151556] [] ? lru_cache_add+0xd9/0x1e0 [ 20.157330] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 20.164422] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.171065] [] __vfs_read+0x103/0x670 [ 20.176483] [] ? default_llseek+0x290/0x290 [ 20.182430] [] ? fsnotify+0x86/0xf30 [ 20.187780] [] ? fsnotify+0xf30/0xf30 [ 20.193214] [] ? avc_policy_seqno+0x9/0x20 [ 20.199087] [] ? selinux_file_permission+0x82/0x460 [ 20.205738] [] ? security_file_permission+0x89/0x1e0 [ 20.212466] [] ? rw_verify_area+0xe5/0x2b0 [ 20.218350] [] vfs_read+0x11e/0x380 [ 20.223612] [] SyS_read+0xd9/0x1b0 [ 20.228774] [] ? vfs_copy_file_range+0x740/0x740 [ 20.235148] [] ? do_fast_syscall_32+0xcf/0x890 [ 20.241364] [] ? vfs_copy_file_range+0x740/0x740 [ 20.247759] [] do_fast_syscall_32+0x2f7/0x890 [ 20.253881] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.260529] [] entry_SYSENTER_compat+0x51/0x60 [ 20.266738] 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 [ 20.293266] RIP [] __free_pages+0x21/0x80 [ 20.299166] RSP [ 20.303210] ---[ end trace 0ef10a5307c86c3b ]--- [ 20.307969] Kernel panic - not syncing: Fatal exception [ 20.313759] Dumping ftrace buffer: [ 20.317291] (ftrace buffer empty) [ 20.321002] Kernel Offset: disabled [ 20.324615] Rebooting in 86400 seconds..