[....] Starting enhanced syslogd: rsyslogd[ 13.017701] audit: type=1400 audit(1515688942.094:4): avc: denied { syslog } for pid=3183 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 file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.27' (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 syzkaller login: [ 21.151758] kasan: CONFIG_KASAN_INLINE enabled [ 21.156363] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 21.163747] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 21.169966] Dumping ftrace buffer: [ 21.173473] (ftrace buffer empty) [ 21.177150] Modules linked in: [ 21.180419] CPU: 0 PID: 3332 Comm: syzkaller987249 Not tainted 4.9.76-g9154940 #20 [ 21.188089] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.197406] task: ffff8801c9ce0000 task.stack: ffff8801c90e8000 [ 21.203425] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 21.211649] RSP: 0018:ffff8801c90ef940 EFLAGS: 00010a07 [ 21.217062] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266640b [ 21.224303] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 21.231537] RBP: ffff8801c90ef950 R08: 0000000000000001 R09: 0000000000000000 [ 21.238776] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 21.246015] R13: 0000000000000020 R14: ffff8801c6538000 R15: dffffc0000000000 [ 21.253257] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000097e6840 [ 21.261446] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 21.267296] CR2: 0000000020977000 CR3: 00000001c8fd4000 CR4: 0000000000160670 [ 21.274531] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.281771] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.289003] Stack: [ 21.291117] ffff8801c9ce0000 ffff8801c6538158 ffff8801c90ef9b0 ffffffff82666431 [ 21.299061] ffff8801c6538170 ffffed0038ca702b ffffed0038ca702e ffff8801c6538168 [ 21.307012] dead4ead00000000 ffff8801c6538140 0000000000000000 0000000000000000 [ 21.314996] Call Trace: [ 21.317550] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 21.324009] [] sg_finish_rem_req+0x2b5/0x340 [ 21.330033] [] sg_new_read.isra.20+0x39/0x3e0 [ 21.336144] [] ? sg_get_rq_mark+0x142/0x190 [ 21.342079] [] sg_read+0x8bd/0x1440 [ 21.347321] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.353953] [] ? fsnotify+0xf30/0xf30 [ 21.359367] [] ? avc_policy_seqno+0x9/0x20 [ 21.365218] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 21.372200] [] ? security_file_permission+0x89/0x1e0 [ 21.378919] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.385564] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.392202] [] compat_do_readv_writev+0x522/0x760 [ 21.398664] [] ? do_pwritev+0x1a0/0x1a0 [ 21.404252] [] ? _raw_spin_unlock+0x2c/0x50 [ 21.410189] [] compat_readv+0xe3/0x150 [ 21.415699] [] do_compat_readv+0xf4/0x1d0 [ 21.421463] [] ? compat_readv+0x150/0x150 [ 21.427224] [] compat_SyS_readv+0x26/0x30 [ 21.432984] [] ? SyS_pwritev2+0x80/0x80 [ 21.438574] [] do_fast_syscall_32+0x2f7/0x890 [ 21.444681] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.451311] [] entry_SYSENTER_compat+0x74/0x83 [ 21.457505] 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 [ 21.483800] RIP [] __free_pages+0x21/0x80 [ 21.489681] RSP [ 21.493587] ---[ end trace 7c826070c98c45f1 ]--- [ 21.498322] Kernel panic - not syncing: Fatal exception [ 21.504195] Dumping ftrace buffer: [ 21.507704] (ftrace buffer empty) [ 21.511378] Kernel Offset: disabled [ 21.514968] Rebooting in 86400 seconds..