[....] Starting enhanced syslogd: rsyslogd[ 13.299376] audit: type=1400 audit(1516046634.742:4): avc: denied { syslog } for pid=3174 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 '10.128.15.233' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.497710] kasan: CONFIG_KASAN_INLINE enabled [ 26.502307] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.509774] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.515979] Dumping ftrace buffer: [ 26.519490] (ftrace buffer empty) [ 26.523170] Modules linked in: [ 26.526461] CPU: 0 PID: 3330 Comm: syzkaller362401 Not tainted 4.9.76-g8dec074 #23 [ 26.534134] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.543460] task: ffff8801ca5d9800 task.stack: ffff8801c8720000 [ 26.549483] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.557725] RSP: 0018:ffff8801c8727940 EFLAGS: 00010a07 [ 26.563141] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266642b [ 26.570394] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.577636] RBP: ffff8801c8727950 R08: 0000000000000001 R09: 0000000000000001 [ 26.584875] R10: 0000000000000000 R11: ffff8801ca5d9800 R12: 0000000000000004 [ 26.592125] R13: 0000000000000020 R14: ffff8801d7eb2100 R15: dffffc0000000000 [ 26.599383] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000099f8840 [ 26.607577] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.613428] CR2: 000000002000f000 CR3: 00000001c8736000 CR4: 0000000000160670 [ 26.620672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.627917] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.635161] Stack: [ 26.637280] 0000000000000001 ffff8801d7eb2258 ffff8801c87279b0 ffffffff82666451 [ 26.645253] ffff8801d7eb2270 ffffed003afd644b ffffed003afd644e ffff8801d7eb2268 [ 26.653224] dead4ead00000000 ffff8801d7eb2240 0000000000000000 0000000000000000 [ 26.661197] Call Trace: [ 26.663761] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.670225] [] sg_finish_rem_req+0x2b5/0x340 [ 26.676253] [] sg_new_read.isra.20+0x356/0x3e0 [ 26.682452] [] ? sg_get_rq_mark+0x157/0x190 [ 26.688392] [] sg_read+0x8bd/0x1440 [ 26.693641] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.700279] [] ? fsnotify+0xf30/0xf30 [ 26.705707] [] ? avc_policy_seqno+0x9/0x20 [ 26.711560] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 26.718543] [] ? security_file_permission+0x89/0x1e0 [ 26.725265] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.731904] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.738542] [] compat_do_readv_writev+0x522/0x760 [ 26.745002] [] ? do_pwritev+0x1a0/0x1a0 [ 26.750600] [] ? sg_ioctl+0x2c30/0x2c30 [ 26.756193] [] ? do_iter_readv_writev+0x400/0x400 [ 26.762665] [] ? __might_sleep+0x95/0x1a0 [ 26.768433] [] ? __inode_security_revalidate+0xd9/0x130 [ 26.775413] [] ? __fsnotify_parent+0xbc/0x340 [ 26.781528] [] ? avc_policy_seqno+0x9/0x20 [ 26.787380] [] ? fsnotify+0x86/0xf30 [ 26.792717] [] ? fsnotify+0xf30/0xf30 [ 26.798142] [] compat_readv+0xe3/0x150 [ 26.803648] [] do_compat_readv+0xf4/0x1d0 [ 26.809418] [] ? compat_readv+0x150/0x150 [ 26.815186] [] ? SyS_read+0x1b0/0x1b0 [ 26.820604] [] compat_SyS_readv+0x26/0x30 [ 26.826375] [] ? SyS_pwritev2+0x80/0x80 [ 26.831971] [] do_fast_syscall_32+0x2f7/0x890 [ 26.838086] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.844723] [] entry_SYSENTER_compat+0x74/0x83 [ 26.850919] 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 [ 26.877565] RIP [] __free_pages+0x21/0x80 [ 26.883454] RSP [ 26.887363] ---[ end trace 2eb389b3c0648e70 ]--- [ 26.892095] Kernel panic - not syncing: Fatal exception [ 26.897753] Dumping ftrace buffer: [ 26.901261] (ftrace buffer empty) [ 26.904942] Kernel Offset: disabled [ 26.908541] Rebooting in 86400 seconds..