[....] Starting enhanced syslogd: rsyslogd[ 12.893364] audit: type=1400 audit(1514759367.013:4): avc: denied { syslog } for pid=3173 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 '10.128.0.52' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 20.576904] kasan: CONFIG_KASAN_INLINE enabled [ 20.581495] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.588972] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.595181] Dumping ftrace buffer: [ 20.598685] (ftrace buffer empty) [ 20.602360] Modules linked in: [ 20.605631] CPU: 1 PID: 3322 Comm: syzkaller029925 Not tainted 4.9.73-gf3f3457 #11 [ 20.613299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.622618] task: ffff8801cad66000 task.stack: ffff8801c9bd8000 [ 20.628634] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.636859] RSP: 0018:ffff8801c9bdfa50 EFLAGS: 00010a07 [ 20.642270] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 20.649506] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 20.656741] RBP: ffff8801c9bdfa60 R08: 0000000000000001 R09: 0000000000000000 [ 20.663977] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 20.671211] R13: 0000000000000020 R14: ffff8801c168c200 R15: dffffc0000000000 [ 20.678450] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000099bb840 [ 20.686640] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 20.692484] CR2: 0000000020001000 CR3: 00000001ccd98000 CR4: 00000000001406e0 [ 20.699728] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.706970] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.714205] Stack: [ 20.716320] ffff8801cad66000 ffff8801c168c358 ffff8801c9bdfac0 ffffffff82664fc1 [ 20.724262] ffff8801c168c370 ffffed00382d186b ffffed00382d186e ffff8801c168c368 [ 20.732209] dead4ead00000000 ffff8801c168c340 0000000000000000 0000000000000000 [ 20.740181] Call Trace: [ 20.742742] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.749198] [] sg_finish_rem_req+0x2b5/0x340 [ 20.755220] [] sg_new_read.isra.20+0x39/0x3e0 [ 20.761332] [] ? sg_get_rq_mark+0x142/0x190 [ 20.767268] [] sg_read+0x8bd/0x1440 [ 20.772519] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.779157] [] ? lru_cache_add+0xd9/0x1e0 [ 20.784927] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 20.791990] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.798621] [] __vfs_read+0x103/0x670 [ 20.804036] [] ? default_llseek+0x290/0x290 [ 20.809971] [] ? fsnotify+0x86/0xf30 [ 20.815297] [] ? fsnotify+0xf30/0xf30 [ 20.820710] [] ? avc_policy_seqno+0x9/0x20 [ 20.826560] [] ? selinux_file_permission+0x82/0x460 [ 20.833189] [] ? security_file_permission+0x89/0x1e0 [ 20.839904] [] ? rw_verify_area+0xe5/0x2b0 [ 20.845752] [] vfs_read+0x11e/0x380 [ 20.850992] [] SyS_read+0xd9/0x1b0 [ 20.856147] [] ? vfs_copy_file_range+0x740/0x740 [ 20.862524] [] ? do_fast_syscall_32+0xcf/0x890 [ 20.868725] [] ? vfs_copy_file_range+0x740/0x740 [ 20.875093] [] do_fast_syscall_32+0x2f7/0x890 [ 20.881203] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.887840] [] entry_SYSENTER_compat+0x51/0x60 [ 20.894033] 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 [ 20.920327] RIP [] __free_pages+0x21/0x80 [ 20.926204] RSP [ 20.930086] ---[ end trace 6249171960213cd4 ]--- [ 20.934905] Kernel panic - not syncing: Fatal exception [ 20.940697] Dumping ftrace buffer: [ 20.944202] (ftrace buffer empty) [ 20.947876] Kernel Offset: disabled [ 20.951467] Rebooting in 86400 seconds..