[....] Starting enhanced syslogd: rsyslogd[ 12.046318] audit: type=1400 audit(1515299391.191:4): 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 '10.128.0.34' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 43.781634] sg_write: data in/out 36090/16 bytes for SCSI command 0x67-- guessing data in; [ 43.781634] program syzkaller318247 not setting count and/or reply_len properly [ 43.782871] sg_write: data in/out 36090/16 bytes for SCSI command 0x67-- guessing data in; [ 43.782871] program syzkaller318247 not setting count and/or reply_len properly [ 43.785870] kasan: CONFIG_KASAN_INLINE enabled [ 43.785872] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 43.785877] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 43.785880] Dumping ftrace buffer: [ 43.785883] (ftrace buffer empty) [ 43.785885] Modules linked in: [ 43.785890] CPU: 0 PID: 3356 Comm: syzkaller318247 Not tainted 4.9.75-g5f5e5d4 #17 [ 43.785892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.785895] task: ffff8801c7cbc800 task.stack: ffff8801cabb0000 [ 43.785906] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 43.785908] RSP: 0018:ffff8801cabb7940 EFLAGS: 00010a07 [ 43.785910] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 43.785913] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 43.785915] RBP: ffff8801cabb7950 R08: 0000000000000001 R09: 0000000000000000 [ 43.785917] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 43.785919] R13: 0000000000000020 R14: ffff8801c8772100 R15: dffffc0000000000 [ 43.785922] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77aab40 [ 43.785924] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 43.785927] CR2: 0000000020bb7000 CR3: 00000001c7d14000 CR4: 0000000000160670 [ 43.785931] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.785933] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.785934] Stack: [ 43.785940] ffff8801c7cbc800 ffff8801c8772258 ffff8801cabb79b0 ffffffff82666341 [ 43.785945] ffff8801c8772270 ffffed00390ee44b ffffed00390ee44e ffff8801c8772268 [ 43.785950] dead4ead00000000 ffff8801c8772240 0000000000000000 0000000000000000 [ 43.785951] Call Trace: [ 43.785957] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 43.785961] [] sg_finish_rem_req+0x2b5/0x340 [ 43.785965] [] sg_new_read.isra.20+0x39/0x3e0 [ 43.785968] [] ? sg_get_rq_mark+0x142/0x190 [ 43.785971] [] sg_read+0x8bd/0x1440 [ 43.785975] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 43.785982] [] ? fsnotify+0xf30/0xf30 [ 43.785987] [] ? avc_policy_seqno+0x9/0x20 [ 43.785993] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 43.785996] [] ? security_file_permission+0x89/0x1e0 [ 43.786000] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 43.786004] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 43.786008] [] compat_do_readv_writev+0x522/0x760 [ 43.786012] [] ? do_pwritev+0x1a0/0x1a0 [ 43.786019] [] ? _raw_spin_unlock+0x2c/0x50 [ 43.786026] [] ? check_preemption_disabled+0x3b/0x200 [ 43.786030] [] ? __fget+0x201/0x3a0 [ 43.786033] [] ? __fget+0x228/0x3a0 [ 43.786036] [] ? __fget+0x47/0x3a0 [ 43.786040] [] compat_readv+0xe3/0x150 [ 43.786044] [] do_compat_readv+0xf4/0x1d0 [ 43.786048] [] ? compat_readv+0x150/0x150 [ 43.786052] [] compat_SyS_readv+0x26/0x30 [ 43.786056] [] ? SyS_pwritev2+0x80/0x80 [ 43.786061] [] do_fast_syscall_32+0x2f7/0x890 [ 43.786065] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.786069] [] entry_SYSENTER_compat+0x74/0x83 [ 43.786126] 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 [ 43.786130] RIP [] __free_pages+0x21/0x80 [ 43.786131] RSP [ 43.786137] ---[ end trace 281d27795fbbb0e4 ]--- [ 43.786139] Kernel panic - not syncing: Fatal exception [ 43.797629] Dumping ftrace buffer: [ 43.797631] (ftrace buffer empty) [ 43.797633] Kernel Offset: disabled [ 44.188949] Rebooting in 86400 seconds..