[....] Starting enhanced syslogd: rsyslogd[ 12.881520] audit: type=1400 audit(1519747414.309:4): avc: denied { syslog } for pid=3653 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.800050] kasan: CONFIG_KASAN_INLINE enabled [ 24.804681] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.812013] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 24.818215] Dumping ftrace buffer: [ 24.821721] (ftrace buffer empty) [ 24.825400] Modules linked in: [ 24.828681] CPU: 0 PID: 3811 Comm: syzkaller412019 Not tainted 4.9.84-ge7f51a5 #45 [ 24.836355] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.845680] task: ffff8801b3c2c800 task.stack: ffff8801d87c0000 [ 24.851703] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.859935] RSP: 0018:ffff8801d87c7950 EFLAGS: 00010a07 [ 24.865352] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668dfb [ 24.872593] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 24.879833] RBP: ffff8801d87c7960 R08: 0000000048000000 R09: 0000000000001e30 [ 24.887080] R10: 0000000000002100 R11: ffff8801b3c2c800 R12: 0000000000000004 [ 24.894323] R13: 0000000000000020 R14: ffff8801d7934200 R15: dffffc0000000000 [ 24.901563] FS: 00007f5f19904700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.909757] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.915606] CR2: 0000000020e94000 CR3: 00000001da356000 CR4: 0000000000160670 [ 24.922847] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.930086] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.937322] Stack: [ 24.939441] 0000000000000001 ffff8801d7934358 ffff8801d87c79c0 ffffffff82668e21 [ 24.947410] ffff8801d7934370 ffffed003af2686b ffffed003af2686e ffff8801d7934368 [ 24.955377] dead4ead00000000 ffff8801d7934340 0000000000000000 0000000000000000 [ 24.963345] Call Trace: [ 24.965907] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.972367] [] sg_finish_rem_req+0x2b5/0x340 [ 24.978394] [] sg_new_read.isra.20+0x18d/0x3e0 [ 24.984601] [] sg_read+0x8b7/0x1440 [ 24.989846] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 24.996480] [] ? fsnotify+0xf30/0xf30 [ 25.001899] [] ? avc_policy_seqno+0x9/0x20 [ 25.007752] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 25.014735] [] ? security_file_permission+0x89/0x1e0 [ 25.021455] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 25.028089] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 25.034723] [] do_readv_writev+0x520/0x750 [ 25.040575] [] ? vfs_write+0x530/0x530 [ 25.046081] [] ? __fget+0x20a/0x3b0 [ 25.051326] [] ? __fget+0x231/0x3b0 [ 25.056570] [] ? __fget+0x47/0x3b0 [ 25.061727] [] vfs_readv+0x84/0xc0 [ 25.066885] [] do_readv+0xe6/0x250 [ 25.072041] [] ? vfs_readv+0xc0/0xc0 [ 25.077373] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 25.083661] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 25.090467] [] SyS_readv+0x27/0x30 [ 25.095625] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 25.102172] [] do_syscall_64+0x1a4/0x490 [ 25.107855] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 25.114748] 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 [ 25.141323] RIP [] __free_pages+0x21/0x80 [ 25.147208] RSP [ 25.151194] ---[ end trace 3c5879f087750f46 ]--- [ 25.156176] Kernel panic - not syncing: Fatal exception [ 25.161928] Dumping ftrace buffer: [ 25.165437] (ftrace buffer empty) [ 25.169116] Kernel Offset: disabled [ 25.172711] Rebooting in 86400 seconds..