[....] Starting enhanced syslogd: rsyslogd[ 13.739145] audit: type=1400 audit(1514510006.208:4): avc: denied { syslog } for pid=3175 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 '10.128.0.58' (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 syzkaller login: [ 26.969105] IPVS: Creating netns size=2536 id=1 executing program executing program executing program executing program executing program [ 27.015156] IPVS: Creating netns size=2536 id=2 [ 27.016825] kasan: CONFIG_KASAN_INLINE enabled [ 27.016827] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.016834] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.016838] Dumping ftrace buffer: [ 27.016840] (ftrace buffer empty) [ 27.016843] Modules linked in: [ 27.016848] CPU: 1 PID: 3340 Comm: syzkaller105530 Not tainted 4.9.72-gcb7518e #114 [ 27.016850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.016853] task: ffff8801caa34800 task.stack: ffff8801c8430000 [ 27.016865] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.016867] RSP: 0018:ffff8801c84379b0 EFLAGS: 00010a07 [ 27.016870] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 27.016872] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.016874] RBP: ffff8801c84379c0 R08: 0000000000000001 R09: 0000000000000000 [ 27.016876] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.016879] R13: 0000000000000020 R14: ffff8801d76b0000 R15: dffffc0000000000 [ 27.016882] FS: 0000000001bbc880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.016884] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.016886] CR2: 00000000204e9fd0 CR3: 00000001cb067000 CR4: 00000000001406e0 [ 27.016892] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.016894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.016895] Stack: [ 27.016900] ffff8801caa34800 ffff8801d76b0158 ffff8801c8437a20 ffffffff82664fc1 [ 27.016905] ffff8801d76b0170 ffffed003aed602b ffffed003aed602e ffff8801d76b0168 [ 27.016910] dead4ead00000000 ffff8801d76b0140 0000000000000000 0000000000000000 [ 27.016911] Call Trace: [ 27.016917] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.016921] [] sg_finish_rem_req+0x2b5/0x340 [ 27.016925] [] sg_new_read.isra.20+0x39/0x3e0 [ 27.016928] [] ? sg_get_rq_mark+0x142/0x190 [ 27.016931] [] sg_read+0x8bd/0x1440 [ 27.016935] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.016941] [] ? fsnotify+0xf30/0xf30 [ 27.016947] [] ? avc_policy_seqno+0x9/0x20 [ 27.016954] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 27.016958] [] ? security_file_permission+0x89/0x1e0 [ 27.016962] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.016965] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.016969] [] do_readv_writev+0x520/0x750 [ 27.016973] [] ? vfs_write+0x530/0x530 [ 27.016981] [] ? __pmd_alloc+0x410/0x410 [ 27.016987] [] ? __do_page_fault+0x5ec/0xd40 [ 27.016991] [] vfs_readv+0x84/0xc0 [ 27.016994] [] do_readv+0xe6/0x250 [ 27.016998] [] ? vfs_readv+0xc0/0xc0 [ 27.017003] [] ? entry_SYSCALL_64_fastpath+0x5/0xc6 [ 27.017010] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.017014] [] SyS_readv+0x27/0x30 [ 27.017017] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 27.017071] 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 [ 27.017075] RIP [] __free_pages+0x21/0x80 [ 27.017076] RSP [ 27.017082] ---[ end trace 6a1b69425857f93b ]--- [ 27.017085] Kernel panic - not syncing: Fatal exception [ 27.020356] Dumping ftrace buffer: [ 27.020358] (ftrace buffer empty) [ 27.020360] Kernel Offset: disabled [ 27.373701] Rebooting in 86400 seconds..