[....] Starting enhanced syslogd: rsyslogd[ 12.281579] audit: type=1400 audit(1514410212.636:4): avc: denied { syslog } for pid=3165 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 '10.128.15.206' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.193821] kasan: CONFIG_KASAN_INLINE enabled [ 19.198405] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.205768] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.211978] Dumping ftrace buffer: [ 19.215490] (ftrace buffer empty) [ 19.219168] Modules linked in: [ 19.222440] CPU: 0 PID: 3321 Comm: syzkaller234185 Not tainted 4.9.72-gcb7518e #10 [ 19.230115] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.239434] task: ffff8801cd33e000 task.stack: ffff8801c8800000 [ 19.245454] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.253680] RSP: 0018:ffff8801c8807a50 EFLAGS: 00010a07 [ 19.259100] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.266336] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.273581] RBP: ffff8801c8807a60 R08: 0000000000000001 R09: 0000000000000000 [ 19.280818] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.288059] R13: 0000000000000020 R14: ffff8801c8f00000 R15: dffffc0000000000 [ 19.295295] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009364840 [ 19.303486] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.309334] CR2: 0000000020002000 CR3: 00000001cadf2000 CR4: 00000000001406f0 [ 19.316579] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.323817] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.331050] Stack: [ 19.333164] ffff8801cd33e000 ffff8801c8f00158 ffff8801c8807ac0 ffffffff82664fc1 [ 19.341117] ffff8801c8f00170 ffffed00391e002b ffffed00391e002e ffff8801c8f00168 [ 19.349064] dead4ead00000000 ffff8801c8f00140 0000000000000000 0000000000000000 [ 19.357016] Call Trace: [ 19.359574] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.366031] [] sg_finish_rem_req+0x2b5/0x340 [ 19.372065] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.378175] [] ? sg_get_rq_mark+0x142/0x190 [ 19.384118] [] sg_read+0x8bd/0x1440 [ 19.389371] [] ? save_stack_trace+0x16/0x20 [ 19.395311] [] ? save_stack+0x43/0xd0 [ 19.400726] [] ? kasan_slab_free+0x72/0xc0 [ 19.406582] [] ? kmem_cache_free+0xc7/0x300 [ 19.412523] [] ? putname+0xee/0x130 [ 19.417769] [] ? do_sys_open+0x252/0x4c0 [ 19.423447] [] ? do_fast_syscall_32+0x2f7/0x890 [ 19.429732] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.436364] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 19.443174] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 19.450065] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.456703] [] __vfs_read+0x103/0x670 [ 19.462126] [] ? default_llseek+0x290/0x290 [ 19.468070] [] ? fsnotify+0x86/0xf30 [ 19.473398] [] ? fsnotify+0xf30/0xf30 [ 19.478831] [] ? avc_policy_seqno+0x9/0x20 [ 19.484688] [] ? selinux_file_permission+0x82/0x460 [ 19.491319] [] ? security_file_permission+0x89/0x1e0 [ 19.498041] [] ? rw_verify_area+0xe5/0x2b0 [ 19.503899] [] vfs_read+0x11e/0x380 [ 19.509148] [] SyS_read+0xd9/0x1b0 [ 19.514304] [] ? vfs_copy_file_range+0x740/0x740 [ 19.520682] [] ? do_fast_syscall_32+0xcf/0x890 [ 19.526879] [] ? vfs_copy_file_range+0x740/0x740 [ 19.533250] [] do_fast_syscall_32+0x2f7/0x890 [ 19.539360] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.545993] [] entry_SYSENTER_compat+0x51/0x60 [ 19.552196] 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 [ 19.578559] RIP [] __free_pages+0x21/0x80 [ 19.584442] RSP [ 19.588856] ---[ end trace f857fcb4c611238e ]--- [ 19.593636] Kernel panic - not syncing: Fatal exception [ 19.599306] Dumping ftrace buffer: [ 19.602819] (ftrace buffer empty) [ 19.606496] Kernel Offset: disabled [ 19.610089] Rebooting in 86400 seconds..