[....] Starting enhanced syslogd: rsyslogd[ 15.843063] audit: type=1400 audit(1521785137.810:4): avc: denied { syslog } for pid=3651 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 '10.128.10.15' (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 syzkaller login: [ 31.801515] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.823470] IPVS: Creating netns size=2536 id=2 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.851970] IPVS: Creating netns size=2536 id=3 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.881217] IPVS: Creating netns size=2536 id=4 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.908338] IPVS: Creating netns size=2536 id=5 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.949000] IPVS: Creating netns size=2536 id=6 [ 31.960381] kasan: CONFIG_KASAN_INLINE enabled [ 31.965124] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.974719] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.980949] Dumping ftrace buffer: [ 31.984475] (ftrace buffer empty) [ 31.988168] Modules linked in: [ 31.991480] CPU: 0 PID: 3837 Comm: syzkaller633873 Not tainted 4.9.89-gf361eb3 #62 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.999172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.008515] task: ffff8801d9873000 task.stack: ffff8801c3678000 [ 32.014559] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 32.022801] RSP: 0018:ffff8801c367fab0 EFLAGS: 00010a07 [ 32.028224] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82669eab [ 32.035466] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.042710] RBP: ffff8801c367fac0 R08: 0000000000000000 R09: ffffed0038404835 [ 32.049951] R10: 0000000000000005 R11: ffffed0038404834 R12: 0000000000000004 [ 32.057198] R13: 0000000000000020 R14: ffff8801d76da100 R15: dffffc0000000000 [ 32.064447] FS: 00007fd4f68e3700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.072644] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.078497] CR2: 00007fd4f6903e78 CR3: 00000001d98c8000 CR4: 0000000000160670 [ 32.085739] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 executing program executing program executing program executing program [ 32.092996] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.100236] Stack: [ 32.102355] 0000000000000001 ffff8801d76da258 ffff8801c367fb20 ffffffff82669ed1 [ 32.110333] ffff8801d76da270 ffffed003aedb44b ffffed003aedb44e ffff8801d76da268 [ 32.118302] dead4ead00000000 ffff8801d76da240 0000000000000000 0000000000000000 [ 32.127494] Call Trace: [ 32.130055] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 32.136521] [] sg_finish_rem_req+0x2a6/0x320 [ 32.142553] [] sg_read+0xa22/0x1470 executing program executing program [ 32.147808] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.154448] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 32.161431] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.168066] [] __vfs_read+0x103/0x670 [ 32.173487] [] ? default_llseek+0x290/0x290 [ 32.179439] [] ? fsnotify+0x86/0xf30 [ 32.184779] [] ? fsnotify+0xf30/0xf30 [ 32.190199] [] ? avc_policy_seqno+0x9/0x20 executing program executing program executing program executing program [ 32.196053] [] ? selinux_file_permission+0x82/0x460 [ 32.202691] [] ? security_file_permission+0x89/0x1e0 [ 32.209418] [] ? rw_verify_area+0xe5/0x2b0 [ 32.215272] [] vfs_read+0x11e/0x380 [ 32.220520] [] SyS_read+0xd9/0x1b0 [ 32.225680] [] ? vfs_copy_file_range+0x740/0x740 [ 32.232060] [] ? do_vfs_ioctl+0x1140/0x1140 [ 32.238008] [] ? do_syscall_64+0x48/0x490 [ 32.243778] [] ? vfs_copy_file_range+0x740/0x740 executing program executing program [ 32.250154] [] do_syscall_64+0x1a4/0x490 [ 32.255833] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.262724] 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 [ 32.289325] RIP [] __free_pages+0x21/0x80 [ 32.295216] RSP [ 32.299548] ---[ end trace d7abd57f8ffc9ba6 ]--- [ 32.304293] Kernel panic - not syncing: Fatal exception [ 32.310076] Dumping ftrace buffer: [ 32.313585] (ftrace buffer empty) [ 32.317262] Kernel Offset: disabled [ 32.320855] Rebooting in 86400 seconds..