[....] Starting enhanced syslogd: rsyslogd[ 11.279845] audit: type=1400 audit(1516067549.802:4): avc: denied { syslog } for pid=3168 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 '10.128.0.45' (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 syzkaller login: [ 27.552938] IPVS: Creating netns size=2536 id=1 [ 27.570153] IPVS: Creating netns size=2536 id=2 [ 27.590413] IPVS: Creating netns size=2536 id=3 [ 27.607318] kasan: CONFIG_KASAN_INLINE enabled [ 27.609919] kasan: CONFIG_KASAN_INLINE enabled [ 27.609921] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.609930] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.609933] Dumping ftrace buffer: [ 27.609936] (ftrace buffer empty) [ 27.609939] Modules linked in: [ 27.609944] CPU: 1 PID: 3355 Comm: syzkaller120648 Not tainted 4.9.76-g8dec074 #23 [ 27.609946] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.609949] task: ffff8801c7386000 task.stack: ffff8801c1bf0000 [ 27.609958] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.609961] RSP: 0018:ffff8801c1bf7940 EFLAGS: 00010a07 [ 27.609963] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266642b [ 27.609965] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.609967] RBP: ffff8801c1bf7950 R08: 0000000000000001 R09: 0000000000000001 [ 27.609969] R10: 0000000000000000 R11: ffff8801c7386000 R12: 0000000000000004 [ 27.609971] R13: 0000000000000020 R14: ffff8801c713a100 R15: dffffc0000000000 [ 27.609975] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7778b40 [ 27.609977] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.609979] CR2: 0000000020dc8000 CR3: 00000001c738e000 CR4: 0000000000160670 [ 27.609984] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.609989] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.609989] Stack: [ 27.609996] ffffffff838b15a9 ffff8801c713a258 ffff8801c1bf79b0 ffffffff82666451 [ 27.610001] ffff8801c713a270 ffffed0038e2744b ffffed0038e2744e ffff8801c713a268 [ 27.610006] dead4ead00000000 ffff8801c713a240 0000000000000000 0000000000000000 [ 27.610007] Call Trace: [ 27.610013] [] ? retint_kernel+0x2d/0x2d [ 27.610020] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.610023] [] sg_finish_rem_req+0x2b5/0x340 [ 27.610027] [] sg_new_read.isra.20+0x356/0x3e0 [ 27.610031] [] ? sg_get_rq_mark+0xe5/0x190 [ 27.610034] [] sg_read+0x8bd/0x1440 [ 27.610038] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.610042] [] ? fsnotify+0xf30/0xf30 [ 27.610047] [] ? avc_policy_seqno+0x9/0x20 [ 27.610053] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 27.610057] [] ? security_file_permission+0x89/0x1e0 [ 27.610060] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.610064] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.610067] [] compat_do_readv_writev+0x522/0x760 [ 27.610071] [] ? do_pwritev+0x1a0/0x1a0 [ 27.610076] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.610083] [] ? check_preemption_disabled+0x3b/0x200 [ 27.610087] [] ? __fget+0x201/0x3a0 [ 27.610090] [] ? __fget+0x228/0x3a0 [ 27.610093] [] ? __fget+0x47/0x3a0 [ 27.610097] [] compat_readv+0xe3/0x150 [ 27.610101] [] do_compat_readv+0xf4/0x1d0 [ 27.610105] [] ? compat_readv+0x150/0x150 [ 27.610109] [] compat_SyS_readv+0x26/0x30 [ 27.610113] [] ? SyS_pwritev2+0x80/0x80 [ 27.610118] [] do_fast_syscall_32+0x2f7/0x890 [ 27.610121] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.610125] [] entry_SYSENTER_compat+0x74/0x83 [ 27.610180] 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 [ 27.610185] RIP [] __free_pages+0x21/0x80 [ 27.610186] RSP [ 27.612477] ---[ end trace 88fe5cbf1c3c87b4 ]--- [ 27.612481] Kernel panic - not syncing: Fatal exception [ 27.612819] Dumping ftrace buffer: [ 27.612821] (ftrace buffer empty) [ 27.612823] Kernel Offset: disabled [ 27.994218] Rebooting in 86400 seconds..