[....] Starting enhanced syslogd: rsyslogd[ 12.423429] audit: type=1400 audit(1518926114.546:4): avc: denied { syslog } for pid=3650 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 '10.128.0.13' (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 syzkaller login: [ 27.650172] 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 executing program executing program executing program executing program executing program executing program [ 27.682920] IPVS: Creating netns size=2536 id=2 [ 27.712143] IPVS: Creating netns size=2536 id=3 [ 27.713384] kasan: CONFIG_KASAN_INLINE enabled [ 27.713386] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.713392] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.713396] Dumping ftrace buffer: [ 27.713398] (ftrace buffer empty) [ 27.713401] Modules linked in: [ 27.713406] CPU: 0 PID: 3826 Comm: syzkaller140790 Not tainted 4.9.82-gcdfc8df #37 [ 27.713408] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.713411] task: ffff8801d8c69800 task.stack: ffff8801d8870000 [ 27.713421] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.713424] RSP: 0018:ffff8801d88779a0 EFLAGS: 00010a07 [ 27.713426] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266867b [ 27.713428] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 27.713430] RBP: ffff8801d88779b0 R08: 0000000000000000 R09: ffffed0038d6f44d [ 27.713433] R10: 0000000000000005 R11: ffffed0038d6f44c R12: 0000000000000004 [ 27.713435] R13: 0000000000000020 R14: ffff8801bf91a100 R15: dffffc0000000000 [ 27.713438] FS: 00007f6f64295700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.713440] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.713442] CR2: 0000000020adff12 CR3: 00000001b8d3e000 CR4: 0000000000160670 [ 27.713447] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.713449] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.713450] Stack: [ 27.713456] ffffffff838b57e9 ffff8801bf91a258 ffff8801d8877a10 ffffffff826686a1 [ 27.713461] ffff8801bf91a270 ffffed0037f2344b ffffed0037f2344e ffff8801bf91a268 [ 27.713465] dead4ead00000000 ffff8801bf91a240 0000000000000000 0000000000000000 [ 27.713466] Call Trace: [ 27.713472] [] ? retint_kernel+0x2d/0x2d [ 27.713478] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.713482] [] sg_finish_rem_req+0x2b5/0x340 [ 27.713485] [] sg_read+0xa16/0x1440 [ 27.713489] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.713493] [] ? fsnotify+0xf30/0xf30 [ 27.713499] [] ? avc_policy_seqno+0x9/0x20 [ 27.713505] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 27.713509] [] ? security_file_permission+0x89/0x1e0 [ 27.713512] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.713516] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.713520] [] do_readv_writev+0x520/0x750 [ 27.713523] [] ? vfs_write+0x530/0x530 [ 27.713527] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.713532] [] ? __fget+0x20a/0x3b0 [ 27.713535] [] ? __fget+0x231/0x3b0 [ 27.713538] [] ? __fget+0x47/0x3b0 [ 27.713542] [] vfs_readv+0x84/0xc0 [ 27.713545] [] do_readv+0xe6/0x250 [ 27.713549] [] ? vfs_readv+0xc0/0xc0 [ 27.713553] [] SyS_readv+0x27/0x30 [ 27.713557] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 27.713562] [] do_syscall_64+0x1a5/0x490 [ 27.713566] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 27.713620] 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 [ 27.713624] RIP [] __free_pages+0x21/0x80 [ 27.713625] RSP [ 27.713631] ---[ end trace 56f5780b93015ca5 ]--- [ 27.713633] Kernel panic - not syncing: Fatal exception [ 27.717190] Dumping ftrace buffer: [ 27.717192] (ftrace buffer empty) [ 27.717194] Kernel Offset: disabled [ 28.071325] Rebooting in 86400 seconds..