[....] Starting enhanced syslogd: rsyslogd[ 10.695327] audit: type=1400 audit(1514530017.692:4): avc: denied { syslog } for pid=3170 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 '10.128.15.238' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.164576] kasan: CONFIG_KASAN_INLINE enabled [ 25.165294] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.166340] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 25.167219] Dumping ftrace buffer: [ 25.167692] (ftrace buffer empty) [ 25.168187] Modules linked in: [ 25.168653] CPU: 0 PID: 3327 Comm: syzkaller444114 Not tainted 4.9.72-gcb7518e #114 [ 25.169673] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.170925] task: ffff8801cb920000 task.stack: ffff8801ccb30000 [ 25.171732] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 25.172850] RSP: 0018:ffff8801ccb379b0 EFLAGS: 00010a07 [ 25.173567] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 25.174534] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 25.175484] RBP: ffff8801ccb379c0 R08: 0000000000000001 R09: 0000000000000000 [ 25.176444] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 25.177394] R13: 0000000000000020 R14: ffff8801ca388000 R15: dffffc0000000000 [ 25.178346] FS: 00000000026cd880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.179468] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.180244] CR2: 0000000020ef0fe0 CR3: 00000001ca8cc000 CR4: 00000000001406f0 [ 25.181198] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.182151] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.183100] Stack: [ 25.183395] ffff8801cb920000 ffff8801ca388158 ffff8801ccb37a20 ffffffff82664fc1 [ 25.184543] ffff8801ca388170 ffffed003947102b ffffed003947102e ffff8801ca388168 [ 25.191755] dead4ead00000000 ffff8801ca388140 0000000000000000 0000000000000000 [ 25.199700] Call Trace: [ 25.202254] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 25.208709] [] sg_finish_rem_req+0x2b5/0x340 [ 25.214732] [] sg_new_read.isra.20+0x39/0x3e0 [ 25.220842] [] ? sg_get_rq_mark+0x142/0x190 [ 25.226777] [] sg_read+0x8bd/0x1440 [ 25.232038] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.238673] [] ? fsnotify+0xf30/0xf30 [ 25.244092] [] ? avc_policy_seqno+0x9/0x20 [ 25.249945] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 25.256924] [] ? security_file_permission+0x89/0x1e0 [ 25.263642] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.270273] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.276903] [] do_readv_writev+0x520/0x750 [ 25.282753] [] ? vfs_write+0x530/0x530 [ 25.288255] [] ? _raw_spin_unlock+0x2c/0x50 [ 25.294195] [] ? __pmd_alloc+0x410/0x410 [ 25.299874] [] ? __do_page_fault+0x5ec/0xd40 [ 25.305896] [] vfs_readv+0x84/0xc0 [ 25.311139] [] do_readv+0xe6/0x250 [ 25.316294] [] ? vfs_readv+0xc0/0xc0 [ 25.321623] [] ? entry_SYSCALL_64_fastpath+0x5/0xc6 [ 25.328254] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 25.335063] [] SyS_readv+0x27/0x30 [ 25.340231] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 25.346771] 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 [ 25.373061] RIP [] __free_pages+0x21/0x80 [ 25.378944] RSP [ 25.382861] ---[ end trace 4080c67193b3e69e ]--- [ 25.387594] Kernel panic - not syncing: Fatal exception [ 25.393403] Dumping ftrace buffer: [ 25.396913] (ftrace buffer empty) [ 25.400589] Kernel Offset: disabled [ 25.404180] Rebooting in 86400 seconds..