[....] Starting enhanced syslogd: rsyslogd[ 12.972064] audit: type=1400 audit(1515508141.340:4): avc: denied { syslog } for pid=3179 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 '10.128.0.8' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.128863] kasan: CONFIG_KASAN_INLINE enabled [ 26.133470] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.140857] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.147061] Dumping ftrace buffer: [ 26.150576] (ftrace buffer empty) [ 26.154253] Modules linked in: [ 26.157534] CPU: 1 PID: 3336 Comm: syzkaller158357 Not tainted 4.9.75-g8910fa5 #19 [ 26.165209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.174537] task: ffff8801c9d5c800 task.stack: ffff8801c8658000 [ 26.180562] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.188808] RSP: 0018:ffff8801c865f940 EFLAGS: 00010a07 [ 26.194234] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 26.201486] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.208726] RBP: ffff8801c865f950 R08: 0000000000000001 R09: 0000000000000000 [ 26.215964] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.223211] R13: 0000000000000020 R14: ffff8801c1964200 R15: dffffc0000000000 [ 26.230458] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:000000000883a840 [ 26.238664] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.244516] CR2: 0000000020ef0fe0 CR3: 00000001c882c000 CR4: 0000000000160670 [ 26.251763] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.259005] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.266246] Stack: [ 26.268394] ffff8801c9d5c800 ffff8801c1964358 ffff8801c865f9b0 ffffffff82666341 [ 26.276346] ffff8801c1964370 ffffed003832c86b ffffed003832c86e ffff8801c1964368 [ 26.284337] dead4ead00000000 ffff8801c1964340 0000000000000000 0000000000000000 [ 26.292295] Call Trace: [ 26.294853] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.301313] [] sg_finish_rem_req+0x2b5/0x340 [ 26.307340] [] sg_new_read.isra.20+0x39/0x3e0 [ 26.313451] [] ? sg_get_rq_mark+0x142/0x190 [ 26.319399] [] sg_read+0x8bd/0x1440 [ 26.324657] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.331301] [] ? fsnotify+0xf30/0xf30 [ 26.336732] [] ? avc_policy_seqno+0x9/0x20 [ 26.342586] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 26.349569] [] ? security_file_permission+0x89/0x1e0 [ 26.356296] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.362945] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.369608] [] compat_do_readv_writev+0x522/0x760 [ 26.376158] [] ? do_pwritev+0x1a0/0x1a0 [ 26.381764] [] ? __lru_cache_add+0x187/0x250 [ 26.387796] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.393756] [] ? handle_mm_fault+0x6ee/0x2530 [ 26.399869] [] ? __pmd_alloc+0x410/0x410 [ 26.405547] [] compat_readv+0xe3/0x150 [ 26.411055] [] do_compat_readv+0xf4/0x1d0 [ 26.416826] [] ? compat_readv+0x150/0x150 [ 26.422606] [] compat_SyS_readv+0x26/0x30 [ 26.428383] [] ? SyS_pwritev2+0x80/0x80 [ 26.433986] [] do_fast_syscall_32+0x2f7/0x890 [ 26.440145] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.446802] [] entry_SYSENTER_compat+0x74/0x83 [ 26.453014] 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 [ 26.479515] RIP [] __free_pages+0x21/0x80 [ 26.485402] RSP [ 26.489218] ---[ end trace 262a1ba0087388ee ]--- [ 26.493958] Kernel panic - not syncing: Fatal exception [ 26.499716] Dumping ftrace buffer: [ 26.503239] (ftrace buffer empty) [ 26.506927] Kernel Offset: disabled [ 26.510523] Rebooting in 86400 seconds..