[....] Starting enhanced syslogd: rsyslogd[ 10.551514] audit: type=1400 audit(1515863863.141:4): avc: denied { syslog } for pid=3175 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.158773] kasan: CONFIG_KASAN_INLINE enabled [ 19.159699] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.160721] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.161623] Dumping ftrace buffer: [ 19.162122] (ftrace buffer empty) [ 19.162688] Modules linked in: [ 19.163201] CPU: 0 PID: 3323 Comm: syzkaller184300 Not tainted 4.9.76-g8e170a5 #11 [ 19.164294] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.165616] task: ffff8801cc496000 task.stack: ffff8801c9e00000 [ 19.166487] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.167661] RSP: 0018:ffff8801c9e07ab0 EFLAGS: 00010a07 [ 19.168420] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266640b [ 19.169661] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.170644] RBP: ffff8801c9e07ac0 R08: 0000000000000001 R09: 0000000000000001 [ 19.171615] R10: 0000000000000000 R11: ffff8801cc496000 R12: 0000000000000004 [ 19.172693] R13: 0000000000000020 R14: ffff8801c8db8000 R15: dffffc0000000000 [ 19.173693] FS: 000000000091f880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 19.174895] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.175693] CR2: 00000000205cbf70 CR3: 00000001cb08e000 CR4: 0000000000160670 [ 19.176687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.177715] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.178724] Stack: [ 19.179978] 0000000000000001 ffff8801c8db8158 ffff8801c9e07b20 ffffffff82666431 [ 19.187969] ffff8801c8db8170 ffffed00391b702b ffffed00391b702e ffff8801c8db8168 [ 19.195942] dead4ead00000000 ffff8801c8db8140 0000000000000000 0000000000000000 [ 19.203921] Call Trace: [ 19.206483] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.212947] [] sg_finish_rem_req+0x2b5/0x340 [ 19.218977] [] sg_new_read.isra.20+0x356/0x3e0 [ 19.225180] [] ? sg_get_rq_mark+0x132/0x190 [ 19.231121] [] sg_read+0x8bd/0x1440 [ 19.236372] [] ? __lru_cache_add+0x187/0x250 [ 19.242406] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.249047] [] ? _raw_spin_unlock+0x2c/0x50 [ 19.254992] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 19.262065] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.268703] [] __vfs_read+0x103/0x670 [ 19.274123] [] ? default_llseek+0x290/0x290 [ 19.280063] [] ? fsnotify+0x86/0xf30 [ 19.285411] [] ? fsnotify+0xf30/0xf30 [ 19.290835] [] ? avc_policy_seqno+0x9/0x20 [ 19.296691] [] ? selinux_file_permission+0x82/0x460 [ 19.303342] [] ? security_file_permission+0x89/0x1e0 [ 19.310067] [] ? rw_verify_area+0xe5/0x2b0 [ 19.315919] [] vfs_read+0x11e/0x380 [ 19.321169] [] SyS_read+0xd9/0x1b0 [ 19.326331] [] ? vfs_copy_file_range+0x740/0x740 [ 19.332711] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.339522] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 19.346073] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 19.352620] 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 [ 19.379259] RIP [] __free_pages+0x21/0x80 [ 19.385158] RSP [ 19.389031] ---[ end trace abcb9ce0d552b504 ]--- [ 19.393777] Kernel panic - not syncing: Fatal exception [ 19.399655] Dumping ftrace buffer: [ 19.403183] (ftrace buffer empty) [ 19.406866] Kernel Offset: disabled [ 19.410467] Rebooting in 86400 seconds..