[....] Starting enhanced syslogd: rsyslogd[ 10.227897] audit: type=1400 audit(1514762851.746:4): avc: denied { syslog } for pid=3168 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 '10.128.15.211' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.953289] kasan: CONFIG_KASAN_INLINE enabled [ 31.954052] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.955068] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.955893] Dumping ftrace buffer: [ 31.956368] (ftrace buffer empty) [ 31.956863] Modules linked in: [ 31.957375] CPU: 1 PID: 3332 Comm: syzkaller465992 Not tainted 4.9.73-gf3f3457 #11 [ 31.958381] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.959650] task: ffff8801cb5b6000 task.stack: ffff8801c8a48000 [ 31.960466] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 31.961640] RSP: 0018:ffff8801c8a4fa50 EFLAGS: 00010a07 [ 31.962357] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 31.963308] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 31.964286] RBP: ffff8801c8a4fa60 R08: 0000000000000001 R09: 0000000000000000 [ 31.965248] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 31.966219] R13: 0000000000000020 R14: ffff8801d757a100 R15: dffffc0000000000 [ 31.967170] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009b59840 [ 31.968244] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.969017] CR2: 0000000020001000 CR3: 00000001c31ad000 CR4: 00000000001406e0 [ 31.970014] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.970968] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.971979] Stack: [ 31.972287] ffff8801cb5b6000 ffff8801d757a258 ffff8801c8a4fac0 ffffffff82664fc1 [ 31.973449] ffff8801d757a270 ffffed003aeaf44b ffffed003aeaf44e ffff8801d757a268 [ 31.981485] dead4ead00000000 ffff8801d757a240 0000000000000000 0000000000000000 [ 31.989445] Call Trace: [ 31.992002] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 31.998471] [] sg_finish_rem_req+0x2b5/0x340 [ 32.004497] [] sg_new_read.isra.20+0x39/0x3e0 [ 32.010622] [] ? sg_get_rq_mark+0x142/0x190 [ 32.016559] [] sg_read+0x8bd/0x1440 [ 32.021802] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 32.028437] [] ? lru_cache_add+0xd9/0x1e0 [ 32.034201] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 32.041267] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 32.047909] [] __vfs_read+0x103/0x670 [ 32.053334] [] ? default_llseek+0x290/0x290 [ 32.059269] [] ? fsnotify+0x86/0xf30 [ 32.064596] [] ? fsnotify+0xf30/0xf30 [ 32.070015] [] ? avc_policy_seqno+0x9/0x20 [ 32.075868] [] ? selinux_file_permission+0x82/0x460 [ 32.082500] [] ? security_file_permission+0x89/0x1e0 [ 32.089226] [] ? rw_verify_area+0xe5/0x2b0 [ 32.095076] [] vfs_read+0x11e/0x380 [ 32.100320] [] SyS_read+0xd9/0x1b0 [ 32.105487] [] ? vfs_copy_file_range+0x740/0x740 [ 32.111857] [] ? do_fast_syscall_32+0xcf/0x890 [ 32.118055] [] ? vfs_copy_file_range+0x740/0x740 [ 32.124433] [] do_fast_syscall_32+0x2f7/0x890 [ 32.130551] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.137180] [] entry_SYSENTER_compat+0x51/0x60 [ 32.143373] 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 [ 32.169731] RIP [] __free_pages+0x21/0x80 [ 32.175630] RSP [ 32.179567] ---[ end trace 197f5dd3669a0c07 ]--- [ 32.184427] Kernel panic - not syncing: Fatal exception [ 32.189810] Dumping ftrace buffer: [ 32.193318] (ftrace buffer empty) [ 32.196997] Kernel Offset: disabled [ 32.200589] Rebooting in 86400 seconds..