[....] Starting enhanced syslogd: rsyslogd[ 12.210299] audit: type=1400 audit(1518485790.384:4): avc: denied { syslog } for pid=3638 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 '10.128.15.223' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.092192] kasan: CONFIG_KASAN_INLINE enabled [ 31.096789] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.104169] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.110370] Dumping ftrace buffer: [ 31.113875] (ftrace buffer empty) [ 31.117554] Modules linked in: [ 31.120832] CPU: 0 PID: 3796 Comm: syzkaller030128 Not tainted 4.9.80-g8a174b47 #31 [ 31.128590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.137916] task: ffff8801b8443000 task.stack: ffff8801d7a00000 [ 31.143941] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 31.152179] RSP: 0018:ffff8801d7a07ab0 EFLAGS: 00010a07 [ 31.157598] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826680eb [ 31.164838] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 31.172080] RBP: ffff8801d7a07ac0 R08: 0000000000000001 R09: 0000000000000001 [ 31.179319] R10: 0000000000000000 R11: ffff8801b8443000 R12: 0000000000000004 [ 31.186557] R13: 0000000000000020 R14: ffff8801d7dba100 R15: dffffc0000000000 [ 31.193800] FS: 0000000001bed880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.201997] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.207846] CR2: 0000000020e7d000 CR3: 00000001d98ce000 CR4: 0000000000160670 [ 31.215085] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.222327] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.229565] Stack: [ 31.231683] ffffffff838b4029 ffff8801d7dba258 ffff8801d7a07b20 ffffffff82668111 [ 31.239646] ffff8801d7dba270 ffffed003afb744b ffffed003afb744e ffff8801d7dba268 [ 31.247606] dead4ead00000000 ffff8801d7dba240 0000000000000000 0000000000000000 [ 31.255567] Call Trace: [ 31.258124] [] ? retint_kernel+0x2d/0x2d [ 31.263802] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 31.270264] [] sg_finish_rem_req+0x2b5/0x340 [ 31.276288] [] sg_new_read.isra.20+0x356/0x3e0 [ 31.282487] [] ? sg_get_rq_mark+0x13b/0x190 [ 31.288430] [] sg_read+0x8b7/0x1440 [ 31.293675] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.300309] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 31.307207] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 31.314013] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 31.320906] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.327543] [] __vfs_read+0x103/0x670 [ 31.332960] [] ? default_llseek+0x290/0x290 [ 31.338901] [] ? fsnotify+0x86/0xf30 [ 31.344234] [] ? fsnotify+0xf30/0xf30 [ 31.349654] [] ? avc_policy_seqno+0x9/0x20 [ 31.355506] [] ? selinux_file_permission+0x82/0x460 [ 31.362151] [] ? security_file_permission+0x89/0x1e0 [ 31.368871] [] ? rw_verify_area+0xe5/0x2b0 [ 31.374727] [] vfs_read+0x11e/0x380 [ 31.379971] [] SyS_read+0xd9/0x1b0 [ 31.385141] [] ? vfs_copy_file_range+0x740/0x740 [ 31.391516] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 31.398324] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.404878] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 31.411423] 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 [ 31.437967] RIP [] __free_pages+0x21/0x80 [ 31.443854] RSP [ 31.447770] ---[ end trace c1b67fbd56366b20 ]--- [ 31.452606] Kernel panic - not syncing: Fatal exception [ 31.458393] Dumping ftrace buffer: [ 31.461900] (ftrace buffer empty) [ 31.465582] Kernel Offset: disabled [ 31.469180] Rebooting in 86400 seconds..