[....] Starting enhanced syslogd: rsyslogd[ 15.385095] audit: type=1400 audit(1517371909.745:4): avc: denied { syslog } for pid=3902 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 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 '10.128.15.216' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.695816] kasan: CONFIG_KASAN_INLINE enabled [ 31.700490] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.707877] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.714086] Dumping ftrace buffer: [ 31.717598] (ftrace buffer empty) [ 31.721280] Modules linked in: [ 31.724563] CPU: 1 PID: 4060 Comm: syzkaller902130 Not tainted 4.9.78-g7be1985 #24 [ 31.732241] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.741570] task: ffff8801d3b23000 task.stack: ffff8801d4478000 [ 31.747595] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 31.755827] RSP: 0018:ffff8801d447fab0 EFLAGS: 00010a07 [ 31.761245] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266775b [ 31.768493] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 31.775732] RBP: ffff8801d447fac0 R08: 0000000000000001 R09: 0000000000000001 [ 31.782981] R10: 0000000000000000 R11: ffff8801d3b23000 R12: 0000000000000004 [ 31.790229] R13: 0000000000000020 R14: ffff8801d51cc200 R15: dffffc0000000000 [ 31.797475] FS: 0000000001b11880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.805689] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.811542] CR2: 00000000201eb000 CR3: 00000001d4b84000 CR4: 0000000000160670 [ 31.818783] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.826022] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.833260] Stack: [ 31.835379] ffffffff838b37a9 ffff8801d51cc358 ffff8801d447fb20 ffffffff82667781 [ 31.843346] ffff8801d51cc370 ffffed003aa3986b ffffed003aa3986e ffff8801d51cc368 [ 31.851314] dead4ead00000000 ffff8801d51cc340 0000000000000000 0000000000000000 [ 31.859281] Call Trace: [ 31.861851] [] ? retint_kernel+0x2d/0x2d [ 31.867533] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 31.873994] [] sg_finish_rem_req+0x2b5/0x340 [ 31.880021] [] sg_new_read.isra.20+0x356/0x3e0 [ 31.886222] [] ? dev_seq_next+0x2a/0xe0 [ 31.891816] [] sg_read+0x8b7/0x1440 [ 31.897061] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.903706] [] ? __lru_cache_add+0x187/0x250 [ 31.909749] [] ? lru_cache_add+0xd9/0x1e0 [ 31.915518] [] ? handle_mm_fault+0xb12/0x2530 [ 31.921631] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.928269] [] __vfs_read+0x103/0x670 [ 31.933692] [] ? default_llseek+0x290/0x290 [ 31.939630] [] ? fsnotify+0x86/0xf30 [ 31.944962] [] ? fsnotify+0xf30/0xf30 [ 31.950381] [] ? avc_policy_seqno+0x9/0x20 [ 31.956233] [] ? selinux_file_permission+0x82/0x460 [ 31.962869] [] ? security_file_permission+0x89/0x1e0 [ 31.969593] [] ? rw_verify_area+0xe5/0x2b0 [ 31.975449] [] vfs_read+0x11e/0x380 [ 31.980694] [] SyS_read+0xd9/0x1b0 [ 31.985852] [] ? vfs_copy_file_range+0x740/0x740 [ 31.992226] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 31.999032] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.005582] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 32.012133] 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 [ 32.038773] RIP [] __free_pages+0x21/0x80 [ 32.044661] RSP [ 32.048579] ---[ end trace 55dea47e34764829 ]--- [ 32.053400] Kernel panic - not syncing: Fatal exception [ 32.059301] Dumping ftrace buffer: [ 32.062820] (ftrace buffer empty) [ 32.066503] Kernel Offset: disabled [ 32.070109] Rebooting in 86400 seconds..