[....] Starting enhanced syslogd: rsyslogd[ 11.549516] audit: type=1400 audit(1516671059.525:4): avc: denied { syslog } for pid=3177 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 '10.128.15.203' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 30.537850] IPVS: Creating netns size=2536 id=1 executing program executing program executing program executing program [ 30.559115] IPVS: Creating netns size=2536 id=2 [ 30.563813] kasan: CONFIG_KASAN_INLINE enabled [ 30.571349] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.578932] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.585154] Dumping ftrace buffer: [ 30.588666] (ftrace buffer empty) [ 30.592353] Modules linked in: [ 30.595639] CPU: 1 PID: 3354 Comm: syzkaller842206 Not tainted 4.9.77-ge12a9c4 #18 [ 30.603313] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.612639] task: ffff8801caec3000 task.stack: ffff8801c87d8000 [ 30.618662] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 30.626896] RSP: 0018:ffff8801c87df9b0 EFLAGS: 00010a07 [ 30.632325] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266751b [ 30.639565] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 30.646806] RBP: ffff8801c87df9c0 R08: 0000000000000001 R09: 0000000000000001 [ 30.654052] R10: 0000000000000000 R11: ffff8801caec3000 R12: 0000000000000004 [ 30.661294] R13: 0000000000000020 R14: ffff8801ca840000 R15: dffffc0000000000 [ 30.668535] FS: 00007f00a8813700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.676732] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.682600] CR2: 00000000203f8f70 CR3: 00000001cc592000 CR4: 0000000000160670 [ 30.689844] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.697099] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.704341] Stack: [ 30.706459] 0000000000000001 ffff8801ca840158 ffff8801c87dfa20 ffffffff82667541 [ 30.714430] ffff8801ca840170 ffffed003950802b ffffed003950802e ffff8801ca840168 [ 30.722397] dead4ead00000000 ffff8801ca840140 0000000000000000 0000000000000000 [ 30.730389] Call Trace: [ 30.732950] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 30.739412] [] sg_finish_rem_req+0x2b5/0x340 [ 30.745442] [] sg_new_read.isra.20+0x356/0x3e0 [ 30.751659] [] ? sg_get_rq_mark+0x121/0x190 [ 30.757598] [] sg_read+0x8bd/0x1440 [ 30.762843] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 30.769477] [] ? fsnotify+0xf30/0xf30 [ 30.774920] [] ? avc_policy_seqno+0x9/0x20 [ 30.780791] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 30.787774] [] ? security_file_permission+0x89/0x1e0 [ 30.794500] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 30.801148] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 30.807784] [] do_readv_writev+0x520/0x750 [ 30.813639] [] ? vfs_write+0x530/0x530 [ 30.819162] [] ? exit_robust_list+0x230/0x230 [ 30.825278] [] ? __fget+0x201/0x3a0 [ 30.830537] [] ? __fget+0x228/0x3a0 [ 30.835788] [] ? __fget+0x47/0x3a0 [ 30.840956] [] ? putname+0xee/0x130 [ 30.846201] [] vfs_readv+0x84/0xc0 [ 30.851361] [] do_readv+0xe6/0x250 [ 30.856521] [] ? vfs_readv+0xc0/0xc0 [ 30.861855] [] ? entry_SYSCALL_64_fastpath+0x5/0xe8 [ 30.868500] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 30.875309] [] SyS_readv+0x27/0x30 [ 30.880479] [] entry_SYSCALL_64_fastpath+0x29/0xe8 executing program executing program [ 30.887024] 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 [ 30.913566] RIP [] __free_pages+0x21/0x80 [ 30.919461] RSP [ 30.924787] ---[ end trace f03f3ff5f8ef8997 ]--- [ 30.925288] IPVS: Creating netns size=2536 id=3 [ 30.934331] Kernel panic - not syncing: Fatal exception [ 30.940068] Dumping ftrace buffer: [ 30.943579] (ftrace buffer empty) [ 30.947264] Kernel Offset: disabled [ 30.950871] Rebooting in 86400 seconds..