[....] Starting enhanced syslogd: rsyslogd[ 11.027518] audit: type=1400 audit(1515564440.766:4): 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[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 53.133679] kasan: CONFIG_KASAN_INLINE enabled [ 53.134493] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 53.135675] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.136517] Dumping ftrace buffer: [ 53.136991] (ftrace buffer empty) [ 53.137538] Modules linked in: [ 53.138027] CPU: 1 PID: 4572 Comm: syzkaller896267 Not tainted 4.9.75-g8910fa5 #19 [ 53.139046] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.140339] task: ffff8801c2f41800 task.stack: ffff8801c2f50000 [ 53.141155] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 53.142299] RSP: 0018:ffff8801c2f57940 EFLAGS: 00010a07 [ 53.143035] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 53.144027] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 53.145039] RBP: ffff8801c2f57950 R08: 0000000000000001 R09: 0000000000000000 [ 53.146125] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 53.147131] R13: 0000000000000020 R14: ffff8801c2f58000 R15: dffffc0000000000 [ 53.148112] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009e77900 [ 53.149249] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 53.150066] CR2: 00000000204e9fd0 CR3: 00000001c36d8000 CR4: 0000000000160670 [ 53.151062] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.152041] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.153147] Stack: [ 53.153474] ffff8801c2f41800 ffff8801c2f58158 ffff8801c2f579b0 ffffffff82666341 [ 53.159312] ffff8801c2f58170 ffffed00385eb02b ffffed00385eb02e ffff8801c2f58168 [ 53.167287] dead4ead00000000 ffff8801c2f58140 0000000000000000 0000000000000000 [ 53.175254] Call Trace: [ 53.177817] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 53.184279] [] sg_finish_rem_req+0x2b5/0x340 [ 53.190318] [] sg_new_read.isra.20+0x39/0x3e0 [ 53.196437] [] ? sg_get_rq_mark+0x142/0x190 [ 53.202378] [] sg_read+0x8bd/0x1440 [ 53.207624] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 53.214259] [] ? fsnotify+0xf30/0xf30 [ 53.219690] [] ? avc_policy_seqno+0x9/0x20 [ 53.225548] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 53.232546] [] ? security_file_permission+0x89/0x1e0 [ 53.239273] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 53.245921] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 53.252558] [] compat_do_readv_writev+0x522/0x760 [ 53.259024] [] ? do_pwritev+0x1a0/0x1a0 [ 53.264630] [] ? _raw_spin_unlock+0x2c/0x50 [ 53.270577] [] ? handle_mm_fault+0x6ee/0x2530 [ 53.276699] [] ? __pmd_alloc+0x410/0x410 [ 53.282382] [] compat_readv+0xe3/0x150 [ 53.287887] [] do_compat_readv+0xf4/0x1d0 [ 53.293654] [] ? compat_readv+0x150/0x150 [ 53.299438] [] compat_SyS_readv+0x26/0x30 [ 53.305213] [] ? SyS_pwritev2+0x80/0x80 [ 53.310818] [] do_fast_syscall_32+0x2f7/0x890 [ 53.316934] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.323574] [] entry_SYSENTER_compat+0x74/0x83 [ 53.329790] 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 [ 53.356185] RIP [] __free_pages+0x21/0x80 [ 53.362084] RSP [ 53.369182] ---[ end trace 18ae2607d6f995a0 ]--- [ 53.373945] Kernel panic - not syncing: Fatal exception [ 53.379315] Dumping ftrace buffer: [ 53.382836] (ftrace buffer empty) [ 53.386515] Kernel Offset: disabled [ 53.390109] Rebooting in 86400 seconds..