[....] Starting enhanced syslogd: rsyslogd[ 13.443899] audit: type=1400 audit(1516122912.908:4): avc: denied { syslog } for pid=3174 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.219' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.286321] kasan: CONFIG_KASAN_INLINE enabled [ 36.290980] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 36.298328] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 36.304541] Dumping ftrace buffer: [ 36.308059] (ftrace buffer empty) [ 36.311741] Modules linked in: [ 36.315020] CPU: 0 PID: 3339 Comm: syzkaller483239 Not tainted 4.9.76-g8dec074 #13 [ 36.322707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.332032] task: ffff8801cb74e000 task.stack: ffff8801cb248000 [ 36.338056] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 36.346298] RSP: 0018:ffff8801cb24fab0 EFLAGS: 00010a07 [ 36.351734] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266642b [ 36.358976] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 36.366225] RBP: ffff8801cb24fac0 R08: 0000000000000001 R09: 0000000000000000 [ 36.373469] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 36.380707] R13: 0000000000000020 R14: ffff8801c8e8a100 R15: dffffc0000000000 [ 36.387948] FS: 0000000001ba7880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.396153] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.402006] CR2: 000000000043e610 CR3: 00000001c8f0e000 CR4: 0000000000160670 [ 36.409249] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.416492] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.423735] Stack: [ 36.425856] ffff8801cb74e000 ffff8801c8e8a258 ffff8801cb24fb20 ffffffff82666451 [ 36.433837] ffff8801c8e8a270 ffffed00391d144b ffffed00391d144e ffff8801c8e8a268 [ 36.441818] dead4ead00000000 ffff8801c8e8a240 0000000000000000 0000000000000000 [ 36.449812] Call Trace: [ 36.452373] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 36.458834] [] sg_finish_rem_req+0x2b5/0x340 [ 36.464863] [] sg_new_read.isra.20+0x39/0x3e0 [ 36.470983] [] ? sg_get_rq_mark+0x142/0x190 [ 36.476925] [] sg_read+0x8bd/0x1440 [ 36.482176] [] ? save_stack_trace+0x16/0x20 [ 36.488122] [] ? save_stack+0x43/0xd0 [ 36.493546] [] ? kasan_slab_free+0x72/0xc0 [ 36.499399] [] ? kmem_cache_free+0xc7/0x300 [ 36.505341] [] ? putname+0xee/0x130 [ 36.510595] [] ? SyS_open+0x2d/0x40 [ 36.515844] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 36.522483] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 36.529306] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 36.536206] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 36.542846] [] __vfs_read+0x103/0x670 [ 36.548271] [] ? default_llseek+0x290/0x290 [ 36.554219] [] ? fsnotify+0x86/0xf30 [ 36.559559] [] ? fsnotify+0xf30/0xf30 [ 36.564989] [] ? avc_policy_seqno+0x9/0x20 [ 36.570844] [] ? selinux_file_permission+0x82/0x460 [ 36.577479] [] ? security_file_permission+0x89/0x1e0 [ 36.584204] [] ? rw_verify_area+0xe5/0x2b0 [ 36.590055] [] vfs_read+0x11e/0x380 [ 36.595307] [] SyS_read+0xd9/0x1b0 [ 36.600467] [] ? vfs_copy_file_range+0x740/0x740 [ 36.606853] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 36.613664] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 36.620228] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 36.626788] 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 [ 36.653333] RIP [] __free_pages+0x21/0x80 [ 36.659229] RSP [ 36.663052] ---[ end trace a6db9ef5b5bcf621 ]--- [ 36.667787] Kernel panic - not syncing: Fatal exception [ 36.673535] Dumping ftrace buffer: [ 36.677054] (ftrace buffer empty) [ 36.680735] Kernel Offset: disabled [ 36.684331] Rebooting in 86400 seconds..