[....] Starting enhanced syslogd: rsyslogd[ 11.432492] audit: type=1400 audit(1516841317.304:4): avc: denied { syslog } for pid=3177 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 '10.128.0.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 22.138320] kasan: CONFIG_KASAN_INLINE enabled [ 22.142986] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 22.150387] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 22.156617] Dumping ftrace buffer: [ 22.160144] (ftrace buffer empty) [ 22.163833] Modules linked in: [ 22.167116] CPU: 1 PID: 3326 Comm: syzkaller638777 Not tainted 4.9.78-g29eadc4 #20 [ 22.174805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.184135] task: ffff8801c8954800 task.stack: ffff8801c81c0000 [ 22.190168] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 22.198417] RSP: 0018:ffff8801c81c7ab0 EFLAGS: 00010a07 [ 22.203838] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826676fb [ 22.211085] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 22.218329] RBP: ffff8801c81c7ac0 R08: 0000000000000001 R09: 0000000000000000 [ 22.225583] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 22.232866] R13: 0000000000000020 R14: ffff8801c826a100 R15: dffffc0000000000 [ 22.232872] FS: 00000000026b9880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.232875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.232878] CR2: 0000000020a2f000 CR3: 00000001ca3ec000 CR4: 0000000000160670 [ 22.232887] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.232890] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.232891] Stack: [ 22.232902] ffff8801c8954800 ffff8801c826a258 ffff8801c81c7b20 ffffffff82667721 [ 22.232909] ffff8801c826a270 ffffed003904d44b ffffed003904d44e ffff8801c826a268 [ 22.232916] dead4ead00000000 ffff8801c826a240 0000000000000000 0000000000000000 [ 22.232918] Call Trace: [ 22.232938] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 22.232945] [] sg_finish_rem_req+0x2b5/0x340 [ 22.232951] [] sg_new_read.isra.20+0x39/0x3e0 [ 22.232958] [] ? sg_get_rq_mark+0x142/0x190 [ 22.232963] [] sg_read+0x8b7/0x1440 [ 22.232974] [] ? __lru_cache_add+0x187/0x250 [ 22.232981] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 22.232988] [] ? _raw_spin_unlock+0x2c/0x50 [ 22.232997] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 22.233004] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 22.233011] [] __vfs_read+0x103/0x670 [ 22.233017] [] ? default_llseek+0x290/0x290 [ 22.233023] [] ? fsnotify+0x86/0xf30 [ 22.233028] [] ? fsnotify+0xf30/0xf30 [ 22.233037] [] ? avc_policy_seqno+0x9/0x20 [ 22.233043] [] ? selinux_file_permission+0x82/0x460 [ 22.233050] [] ? security_file_permission+0x89/0x1e0 [ 22.233057] [] ? rw_verify_area+0xe5/0x2b0 [ 22.233063] [] vfs_read+0x11e/0x380 [ 22.233069] [] SyS_read+0xd9/0x1b0 [ 22.233076] [] ? vfs_copy_file_range+0x740/0x740 [ 22.233085] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 22.233092] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 22.233099] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 22.233192] 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 [ 22.233200] RIP [] __free_pages+0x21/0x80 [ 22.233202] RSP [ 22.237987] ---[ end trace 0f10206c076bf066 ]--- [ 22.237993] Kernel panic - not syncing: Fatal exception [ 22.240624] Dumping ftrace buffer: [ 22.240628] (ftrace buffer empty) [ 22.240631] Kernel Offset: disabled [ 22.498833] Rebooting in 86400 seconds..