[....] Starting enhanced syslogd: rsyslogd[ 10.237225] audit: type=1400 audit(1516158633.489:4): avc: denied { syslog } for pid=3177 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 '10.128.15.198' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.125808] sg_write: data in/out 9964/6 bytes for SCSI command 0x0-- guessing data in; [ 32.125808] program syzkaller854221 not setting count and/or reply_len properly [ 32.128153] kasan: CONFIG_KASAN_INLINE enabled [ 32.128883] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 32.129872] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.130734] Dumping ftrace buffer: [ 32.131224] (ftrace buffer empty) [ 32.131739] Modules linked in: [ 32.132214] CPU: 1 PID: 3342 Comm: syzkaller854221 Not tainted 4.9.76-g8dec074 #23 [ 32.133227] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.134448] task: ffff8801caa80000 task.stack: ffff8801c8850000 [ 32.135276] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 32.136565] RSP: 0018:ffff8801c8857940 EFLAGS: 00010a07 [ 32.137296] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266642b [ 32.138268] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 32.139239] RBP: ffff8801c8857950 R08: 0000000000000001 R09: 0000000000000000 [ 32.140239] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 32.141307] R13: 0000000000000020 R14: ffff8801c8a42100 R15: dffffc0000000000 [ 32.142281] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:000000000834f840 [ 32.143412] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.144233] CR2: 0000000020ef0fe0 CR3: 00000001c898e000 CR4: 0000000000160670 [ 32.145270] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.146305] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.153541] Stack: [ 32.155667] ffff8801caa80000 ffff8801c8a42258 ffff8801c88579b0 ffffffff82666451 [ 32.163655] ffff8801c8a42270 ffffed003914844b ffffed003914844e ffff8801c8a42268 [ 32.171622] dead4ead00000000 ffff8801c8a42240 0000000000000000 0000000000000000 [ 32.179602] Call Trace: [ 32.182162] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 32.188644] [] sg_finish_rem_req+0x2b5/0x340 [ 32.194673] [] sg_new_read.isra.20+0x39/0x3e0 [ 32.200787] [] ? sg_get_rq_mark+0x142/0x190 [ 32.206727] [] sg_read+0x8bd/0x1440 [ 32.211972] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 32.218608] [] ? fsnotify+0xf30/0xf30 [ 32.224030] [] ? avc_policy_seqno+0x9/0x20 [ 32.229885] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 32.236884] [] ? security_file_permission+0x89/0x1e0 [ 32.243609] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 32.250243] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 32.256891] [] compat_do_readv_writev+0x522/0x760 [ 32.263353] [] ? do_pwritev+0x1a0/0x1a0 [ 32.268947] [] ? __lru_cache_add+0x187/0x250 [ 32.274977] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.280915] [] ? handle_mm_fault+0x6ee/0x2530 [ 32.287039] [] ? __pmd_alloc+0x410/0x410 [ 32.292722] [] compat_readv+0xe3/0x150 [ 32.298228] [] do_compat_readv+0xf4/0x1d0 [ 32.303998] [] ? compat_readv+0x150/0x150 [ 32.310376] [] compat_SyS_readv+0x26/0x30 [ 32.316145] [] ? SyS_pwritev2+0x80/0x80 [ 32.321739] [] do_fast_syscall_32+0x2f7/0x890 [ 32.327850] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.334483] [] entry_SYSENTER_compat+0x74/0x83 [ 32.340679] 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 [ 32.367261] RIP [] __free_pages+0x21/0x80 [ 32.373150] RSP [ 32.376987] ---[ end trace 0e2979721092b76b ]--- [ 32.381737] Kernel panic - not syncing: Fatal exception [ 32.387443] Dumping ftrace buffer: [ 32.390965] (ftrace buffer empty) [ 32.394643] Kernel Offset: disabled [ 32.398238] Rebooting in 86400 seconds..