[....] Starting enhanced syslogd: rsyslogd[ 13.621546] audit: type=1400 audit(1520974152.072:4): avc: denied { syslog } for pid=3662 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: [ 24.766740] kasan: CONFIG_KASAN_INLINE enabled [ 24.771515] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.778853] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 24.785053] Dumping ftrace buffer: [ 24.788568] (ftrace buffer empty) [ 24.792248] Modules linked in: [ 24.795528] CPU: 1 PID: 3820 Comm: syzkaller081042 Not tainted 4.9.87-g97d7f1c #54 [ 24.803208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.812533] task: ffff8801b2c74800 task.stack: ffff8801d82d0000 [ 24.818556] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.826797] RSP: 0018:ffff8801d82d7940 EFLAGS: 00010a07 [ 24.832215] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826692ab [ 24.839461] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 24.847137] RBP: ffff8801d82d7950 R08: 0000000048000000 R09: 0000000000001e30 [ 24.854376] R10: 0000000000002100 R11: ffff8801b2c74800 R12: 0000000000000004 [ 24.861613] R13: 0000000000000020 R14: ffff8801d906a100 R15: dffffc0000000000 [ 24.868855] FS: 00007fca41f38700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 24.877053] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.882907] CR2: 0000000020e94000 CR3: 00000001c5ac8000 CR4: 0000000000160670 [ 24.890146] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.897386] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.904630] Stack: [ 24.906748] 0000000000000001 ffff8801d906a258 ffff8801d82d79b0 ffffffff826692d1 [ 24.914736] ffff8801d906a270 ffffed003b20d44b ffffed003b20d44e ffff8801d906a268 [ 24.922702] dead4ead00000000 ffff8801d906a240 0000000000000000 0000000000000000 [ 24.930675] Call Trace: [ 24.933237] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.939699] [] sg_finish_rem_req+0x2b5/0x340 [ 24.945727] [] sg_new_read.isra.20+0x18d/0x3e0 [ 24.951925] [] sg_read+0x8b7/0x1440 [ 24.957171] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 24.963808] [] ? fsnotify+0x86/0xf30 [ 24.969226] [] ? fsnotify+0xf30/0xf30 [ 24.974649] [] ? avc_policy_seqno+0x9/0x20 [ 24.980589] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 24.987581] [] do_readv_writev+0x5fd/0x740 [ 24.993438] [] ? vfs_write+0x530/0x530 [ 24.998947] [] ? __fget+0x20a/0x3b0 [ 25.004952] [] ? __fget+0x231/0x3b0 [ 25.010833] [] ? __fget+0x47/0x3b0 [ 25.015996] [] vfs_readv+0x84/0xc0 [ 25.021156] [] do_readv+0xe6/0x250 [ 25.026323] [] ? vfs_readv+0xc0/0xc0 [ 25.031657] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 25.037951] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 25.044763] [] SyS_readv+0x27/0x30 [ 25.049922] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 25.056471] [] do_syscall_64+0x1a4/0x490 [ 25.062152] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.069044] 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 [ 25.095620] RIP [] __free_pages+0x21/0x80 [ 25.101589] RSP [ 25.105434] ---[ end trace 9b55d61380daf55e ]--- [ 25.110338] Kernel panic - not syncing: Fatal exception [ 25.116299] Dumping ftrace buffer: [ 25.119811] (ftrace buffer empty) [ 25.123492] Kernel Offset: disabled [ 25.127088] Rebooting in 86400 seconds..