[....] Starting enhanced syslogd: rsyslogd[ 13.496274] audit: type=1400 audit(1515434796.235:4): avc: denied { syslog } for pid=3179 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.5' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 syzkaller login: [ 22.188971] audit: type=1400 audit(1515434804.925:5): avc: denied { sys_admin } for pid=3328 comm="syzkaller169030" capability=21 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 22.219239] IPVS: Creating netns size=2536 id=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.262193] audit: type=1400 audit(1515434805.005:6): avc: denied { sys_chroot } for pid=3352 comm="syzkaller169030" capability=18 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 23.775919] kasan: CONFIG_KASAN_INLINE enabled [ 23.780552] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 23.788064] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 23.794279] Dumping ftrace buffer: [ 23.797787] (ftrace buffer empty) [ 23.801468] Modules linked in: [ 23.804744] CPU: 0 PID: 3758 Comm: syzkaller169030 Not tainted 4.9.75-g5f5e5d4 #7 [ 23.812343] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.821667] task: ffff8801c4f3c800 task.stack: ffff8801c4f18000 [ 23.829173] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 23.839509] RSP: 0018:ffff8801c4f1f9b0 EFLAGS: 00010a07 [ 23.844924] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 23.852172] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 23.859409] RBP: ffff8801c4f1f9c0 R08: 0000000048000000 R09: 0000000000001e30 [ 23.866647] R10: 0000000000002100 R11: ffff8801c4f3c800 R12: 0000000000000004 [ 23.873893] R13: 0000000000000020 R14: ffff8801c4eda100 R15: dffffc0000000000 [ 23.881133] FS: 0000000001310880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.889327] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.895183] CR2: 0000000020a13000 CR3: 00000001c4eee000 CR4: 0000000000160670 [ 23.902430] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.909670] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.916906] Stack: [ 23.919030] 0000000000000001 ffff8801c4eda258 ffff8801c4f1fa20 ffffffff82666341 [ 23.926991] ffff8801c4eda270 ffffed00389db44b ffffed00389db44e ffff8801c4eda268 [ 23.934959] dead4ead00000000 ffff8801c4eda240 0000000000000000 0000000000000000 [ 23.942921] Call Trace: [ 23.945483] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 23.951946] [] sg_finish_rem_req+0x2b5/0x340 [ 23.957970] [] sg_new_read.isra.20+0x18d/0x3e0 [ 23.964167] [] sg_read+0x8bd/0x1440 [ 23.969410] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 23.976047] [] ? fsnotify+0xf30/0xf30 [ 23.981464] [] ? avc_policy_seqno+0x9/0x20 [ 23.987318] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 23.994298] [] ? security_file_permission+0x89/0x1e0 [ 24.001022] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.007654] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.014302] [] do_readv_writev+0x520/0x750 [ 24.020158] [] ? vfs_write+0x530/0x530 [ 24.025669] [] ? __pmd_alloc+0x410/0x410 [ 24.031348] [] ? __do_page_fault+0x5ec/0xd40 [ 24.037383] [] vfs_readv+0x84/0xc0 [ 24.042541] [] do_readv+0xe6/0x250 [ 24.047716] [] ? vfs_readv+0xc0/0xc0 [ 24.053057] [] ? entry_SYSCALL_64_fastpath+0x5/0xe2 [ 24.059694] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 24.066509] [] SyS_readv+0x27/0x30 [ 24.071671] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 24.078217] 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 [ 24.105446] RIP [] __free_pages+0x21/0x80 [ 24.111332] RSP [ 24.115025] ---[ end trace f34bfcb59fdf42e9 ]--- [ 24.119773] Kernel panic - not syncing: Fatal exception [ 24.125983] Dumping ftrace buffer: [ 24.129506] (ftrace buffer empty) [ 24.133185] Kernel Offset: disabled [ 24.136780] Rebooting in 86400 seconds..