[....] Starting enhanced syslogd: rsyslogd[ 9.691844] audit: type=1400 audit(1514415508.901:4): avc: denied { syslog } for pid=3170 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 '10.128.0.61' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 21.027508] kasan: CONFIG_KASAN_INLINE enabled [ 21.028226] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 21.029216] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 21.030042] Dumping ftrace buffer: [ 21.030536] (ftrace buffer empty) [ 21.031041] Modules linked in: [ 21.031511] CPU: 0 PID: 3329 Comm: syzkaller342105 Not tainted 4.9.72-gcb7518e #10 [ 21.032517] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.033734] task: ffff8801cae5b000 task.stack: ffff8801c8960000 [ 21.034561] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 21.035664] RSP: 0018:ffff8801c8967a50 EFLAGS: 00010a07 [ 21.036380] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 21.037363] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 21.038356] RBP: ffff8801c8967a60 R08: 0000000000000001 R09: 0000000000000000 [ 21.039307] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 21.040259] R13: 0000000000000020 R14: ffff8801c9ada100 R15: dffffc0000000000 [ 21.041211] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009657840 [ 21.042283] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 21.043141] CR2: 0000000020001000 CR3: 00000001c9022000 CR4: 00000000001406f0 [ 21.044120] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.045124] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.046074] Stack: [ 21.046389] ffff8801cae5b000 ffff8801c9ada258 ffff8801c8967ac0 ffffffff82664fc1 [ 21.047523] ffff8801c9ada270 ffffed003935b44b ffffed003935b44e ffff8801c9ada268 [ 21.054964] dead4ead00000000 ffff8801c9ada240 0000000000000000 0000000000000000 [ 21.062926] Call Trace: [ 21.065482] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 21.071945] [] sg_finish_rem_req+0x2b5/0x340 [ 21.077967] [] sg_new_read.isra.20+0x39/0x3e0 [ 21.084074] [] ? sg_get_rq_mark+0x142/0x190 [ 21.090012] [] sg_read+0x8bd/0x1440 [ 21.095253] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.102058] [] ? lru_cache_add+0xd9/0x1e0 [ 21.107818] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 21.114880] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.121515] [] __vfs_read+0x103/0x670 [ 21.126932] [] ? default_llseek+0x290/0x290 [ 21.132872] [] ? fsnotify+0x86/0xf30 [ 21.138200] [] ? fsnotify+0xf30/0xf30 [ 21.143622] [] ? avc_policy_seqno+0x9/0x20 [ 21.149470] [] ? selinux_file_permission+0x82/0x460 [ 21.156102] [] ? security_file_permission+0x89/0x1e0 [ 21.162820] [] ? rw_verify_area+0xe5/0x2b0 [ 21.168666] [] vfs_read+0x11e/0x380 [ 21.173905] [] SyS_read+0xd9/0x1b0 [ 21.179058] [] ? vfs_copy_file_range+0x740/0x740 [ 21.185426] [] ? do_fast_syscall_32+0xcf/0x890 [ 21.191622] [] ? vfs_copy_file_range+0x740/0x740 [ 21.197989] [] do_fast_syscall_32+0x2f7/0x890 [ 21.204097] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.210727] [] entry_SYSENTER_compat+0x51/0x60 [ 21.216919] 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 [ 21.243261] RIP [] __free_pages+0x21/0x80 [ 21.249141] RSP [ 21.253194] ---[ end trace 3de05ddd497966b8 ]--- [ 21.258011] Kernel panic - not syncing: Fatal exception [ 21.263721] Dumping ftrace buffer: [ 21.267227] (ftrace buffer empty) [ 21.270902] Kernel Offset: disabled [ 21.274494] Rebooting in 86400 seconds..