[....] Starting enhanced syslogd: rsyslogd[ 10.322842] audit: type=1400 audit(1514389775.597:4): avc: denied { syslog } for pid=3166 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 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 '10.128.15.200' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.415747] sg_write: data in/out 262108/32 bytes for SCSI command 0x0-- guessing data in; [ 19.415747] program syzkaller014103 not setting count and/or reply_len properly [ 19.419684] kasan: CONFIG_KASAN_INLINE enabled [ 19.420344] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.421355] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.422220] Dumping ftrace buffer: [ 19.422725] (ftrace buffer empty) [ 19.423219] Modules linked in: [ 19.423688] CPU: 1 PID: 3318 Comm: syzkaller014103 Not tainted 4.9.72-gcb7518e #114 [ 19.424707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.425969] task: ffff8801ca8ee000 task.stack: ffff8801c9ed8000 [ 19.426770] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.427892] RSP: 0018:ffff8801c9edfab0 EFLAGS: 00010a07 [ 19.428616] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.429589] RDX: 1bd5a9d5a0000003 RSI: 0000000000000008 RDI: dead4ead0000001c [ 19.430541] RBP: ffff8801c9edfac0 R08: 0000000000000001 R09: 0000000000000001 [ 19.431520] R10: 0000000000000000 R11: ffff8801ca8ee000 R12: 0000000000000004 [ 19.432508] R13: 0000000000000020 R14: ffff8801c9b14200 R15: dffffc0000000000 [ 19.433474] FS: 0000000002587880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 19.434565] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.435342] CR2: 0000000020db9000 CR3: 00000001c9a34000 CR4: 00000000001406e0 [ 19.439371] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.446606] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.453840] Stack: [ 19.455954] ffffffff838affb9 ffff8801c9b14358 ffff8801c9edfb20 ffffffff82664fc1 [ 19.463900] ffff8801c9b14370 ffffed003936286b ffffed003936286e ffff8801c9b14368 [ 19.471857] dead4ead00000000 ffff8801c9b14340 0000000000000000 0000000000000000 [ 19.479822] Call Trace: [ 19.482379] [] ? retint_kernel+0x2d/0x2d [ 19.488074] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.494532] [] sg_finish_rem_req+0x2b5/0x340 [ 19.500557] [] sg_new_read.isra.20+0x356/0x3e0 [ 19.506752] [] ? sg_idr_max_id+0xb/0x60 [ 19.512342] [] sg_read+0x8bd/0x1440 [ 19.517586] [] ? __lru_cache_add+0x187/0x250 [ 19.523609] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.530242] [] ? _raw_spin_unlock+0x2c/0x50 [ 19.536183] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 19.543249] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.549882] [] __vfs_read+0x103/0x670 [ 19.555307] [] ? default_llseek+0x290/0x290 [ 19.561252] [] ? fsnotify+0x86/0xf30 [ 19.566582] [] ? fsnotify+0xf30/0xf30 [ 19.572001] [] ? avc_policy_seqno+0x9/0x20 [ 19.577852] [] ? selinux_file_permission+0x82/0x460 [ 19.584483] [] ? security_file_permission+0x89/0x1e0 [ 19.591204] [] ? rw_verify_area+0xe5/0x2b0 [ 19.597056] [] vfs_read+0x11e/0x380 [ 19.602299] [] SyS_read+0xd9/0x1b0 [ 19.607464] [] ? vfs_copy_file_range+0x740/0x740 [ 19.613836] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.620642] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 19.627186] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 19.633738] 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 [ 19.660195] RIP [] __free_pages+0x21/0x80 [ 19.666082] RSP [ 19.669978] ---[ end trace 2847c96b76821f42 ]--- [ 19.674718] Kernel panic - not syncing: Fatal exception [ 19.680488] Dumping ftrace buffer: [ 19.684085] (ftrace buffer empty) [ 19.687762] Kernel Offset: disabled [ 19.691353] Rebooting in 86400 seconds..