[....] Starting enhanced syslogd: rsyslogd[ 13.410261] audit: type=1400 audit(1516013067.750:4): avc: denied { syslog } for pid=3182 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 '10.128.0.16' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 22.817797] sg_write: data in/out 9964/6 bytes for SCSI command 0x0-- guessing data in; [ 22.817797] program syzkaller392912 not setting count and/or reply_len properly [ 22.834577] kasan: CONFIG_KASAN_INLINE enabled [ 22.839175] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 22.846552] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 22.852762] Dumping ftrace buffer: [ 22.856274] (ftrace buffer empty) [ 22.860510] Modules linked in: [ 22.863795] CPU: 0 PID: 3331 Comm: syzkaller392912 Not tainted 4.9.76-gf0f6293 #22 [ 22.871469] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.880795] task: ffff8801c9800000 task.stack: ffff8801c8da0000 [ 22.886820] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 22.895071] RSP: 0018:ffff8801c8da7940 EFLAGS: 00010a07 [ 22.900490] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266640b [ 22.907739] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 22.914985] RBP: ffff8801c8da7950 R08: 0000000000000001 R09: 0000000000000000 [ 22.922232] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 22.929476] R13: 0000000000000020 R14: ffff8801ce3c4200 R15: dffffc0000000000 [ 22.936722] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009804840 [ 22.944920] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 22.950795] CR2: 0000000020ef0fe0 CR3: 00000001c82e6000 CR4: 0000000000160670 [ 22.958054] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.965306] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.972546] Stack: [ 22.974667] ffff8801c9800000 ffff8801ce3c4358 ffff8801c8da79b0 ffffffff82666431 [ 22.982654] ffff8801ce3c4370 ffffed0039c7886b ffffed0039c7886e ffff8801ce3c4368 [ 22.990643] dead4ead00000000 ffff8801ce3c4340 0000000000000000 0000000000000000 [ 22.998615] Call Trace: [ 23.001179] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 23.007644] [] sg_finish_rem_req+0x2b5/0x340 [ 23.013678] [] sg_new_read.isra.20+0x39/0x3e0 [ 23.019804] [] ? sg_get_rq_mark+0x142/0x190 [ 23.025748] [] sg_read+0x8bd/0x1440 [ 23.031033] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 23.037697] [] ? fsnotify+0xf30/0xf30 [ 23.043126] [] ? avc_policy_seqno+0x9/0x20 [ 23.048993] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 23.055976] [] ? security_file_permission+0x89/0x1e0 [ 23.062700] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 23.069336] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 23.075973] [] compat_do_readv_writev+0x522/0x760 [ 23.082438] [] ? do_pwritev+0x1a0/0x1a0 [ 23.088034] [] ? __lru_cache_add+0x187/0x250 [ 23.094081] [] ? _raw_spin_unlock+0x2c/0x50 [ 23.100039] [] ? handle_mm_fault+0x6ee/0x2530 [ 23.106169] [] ? __pmd_alloc+0x410/0x410 [ 23.111852] [] compat_readv+0xe3/0x150 [ 23.117368] [] do_compat_readv+0xf4/0x1d0 [ 23.123149] [] ? compat_readv+0x150/0x150 [ 23.128919] [] compat_SyS_readv+0x26/0x30 [ 23.134693] [] ? SyS_pwritev2+0x80/0x80 [ 23.140305] [] do_fast_syscall_32+0x2f7/0x890 [ 23.146426] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 23.153068] [] entry_SYSENTER_compat+0x74/0x83 [ 23.159288] 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 [ 23.186045] RIP [] __free_pages+0x21/0x80 [ 23.191956] RSP [ 23.196025] ---[ end trace 4f4b753c364cb27c ]--- [ 23.200906] Kernel panic - not syncing: Fatal exception [ 23.206726] Dumping ftrace buffer: [ 23.210244] (ftrace buffer empty) [ 23.213927] Kernel Offset: disabled [ 23.217523] Rebooting in 86400 seconds..