[....] Starting enhanced syslogd: rsyslogd[ 12.298270] audit: type=1400 audit(1521988778.105:4): avc: denied { syslog } for pid=3509 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 20.013280] kasan: CONFIG_KASAN_INLINE enabled [ 20.017864] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.025227] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.031436] Dumping ftrace buffer: [ 20.034947] (ftrace buffer empty) [ 20.038628] Modules linked in: [ 20.041907] CPU: 1 PID: 3657 Comm: syzkaller833617 Not tainted 4.9.90-gdd1e37e #66 [ 20.049589] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.058912] task: ffff8801c3e53000 task.stack: ffff8801cd3c8000 [ 20.064936] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.073169] RSP: 0018:ffff8801cd3cfa58 EFLAGS: 00010a07 [ 20.078594] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266905b [ 20.085834] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 20.093074] RBP: ffff8801cd3cfa68 R08: 0000000000000001 R09: 0000000000000001 [ 20.100323] R10: 0000000000000000 R11: ffff8801c3e53000 R12: 0000000000000004 [ 20.107562] R13: 0000000000000020 R14: ffff8801bd460000 R15: dffffc0000000000 [ 20.114802] FS: 0000000001f72880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 20.122998] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.128850] CR2: 000000000043e530 CR3: 00000001bdd34000 CR4: 0000000000160670 [ 20.136178] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.143419] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.150656] Stack: [ 20.152772] 0000000000000001 ffff8801bd460158 ffff8801cd3cfac8 ffffffff82669081 [ 20.160748] ffff8801bd460170 ffffed0037a8c02b ffffed0037a8c02e ffff8801bd460168 [ 20.168711] dead4ead00000000 ffff8801bd460140 0000000000000000 0000000000000000 [ 20.176684] Call Trace: [ 20.179244] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.185709] [] sg_finish_rem_req+0x2a6/0x320 [ 20.191737] [] sg_new_read+0x38c/0x440 [ 20.197248] [] sg_read+0x8c5/0x1470 [ 20.202499] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 20.209133] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.215939] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 20.222834] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 20.229470] [] __vfs_read+0x103/0x670 [ 20.234886] [] ? default_llseek+0x290/0x290 [ 20.240911] [] ? fsnotify+0x86/0xf30 [ 20.246239] [] ? fsnotify+0xf30/0xf30 [ 20.251658] [] ? avc_policy_seqno+0x9/0x20 [ 20.257508] [] ? selinux_file_permission+0x82/0x460 [ 20.264142] [] ? security_file_permission+0x89/0x1e0 [ 20.270861] [] ? rw_verify_area+0xe5/0x2b0 [ 20.276711] [] vfs_read+0x11e/0x380 [ 20.281956] [] SyS_read+0xd9/0x1b0 [ 20.287116] [] ? vfs_copy_file_range+0x740/0x740 [ 20.293488] [] ? do_syscall_64+0x48/0x490 [ 20.299252] [] ? vfs_copy_file_range+0x740/0x740 [ 20.305624] [] do_syscall_64+0x1a4/0x490 [ 20.311312] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.318202] 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 [ 20.344771] RIP [] __free_pages+0x21/0x80 [ 20.350657] RSP [ 20.354672] ---[ end trace 6c17f8f5e79dbf3d ]--- [ 20.359443] Kernel panic - not syncing: Fatal exception [ 20.365205] Dumping ftrace buffer: [ 20.368718] (ftrace buffer empty) [ 20.372398] Kernel Offset: disabled [ 20.375992] Rebooting in 86400 seconds..