[....] Starting enhanced syslogd: rsyslogd[ 10.762160] audit: type=1400 audit(1516194996.279:4): 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[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 '10.128.15.194' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 18.923858] kasan: CONFIG_KASAN_INLINE enabled [ 18.924624] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 18.925726] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 18.926585] Dumping ftrace buffer: [ 18.927102] (ftrace buffer empty) [ 18.927641] Modules linked in: [ 18.928153] CPU: 0 PID: 3322 Comm: syzkaller960632 Not tainted 4.9.77-g033d019 #14 [ 18.929179] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.930503] task: ffff8801cb3b0000 task.stack: ffff8801c8810000 [ 18.931441] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 18.932572] RSP: 0018:ffff8801c8817ab0 EFLAGS: 00010a07 [ 18.933313] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266751b [ 18.934340] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 18.935315] RBP: ffff8801c8817ac0 R08: 0000000000000001 R09: 0000000000000000 [ 18.936347] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 18.937322] R13: 0000000000000020 R14: ffff8801c892c200 R15: dffffc0000000000 [ 18.938320] FS: 000000000158e880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 18.939411] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.940207] CR2: 000000000043e530 CR3: 00000001cb9c4000 CR4: 0000000000160670 [ 18.941209] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.942182] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.943163] Stack: [ 18.943481] ffff8801cb3b0000 ffff8801c892c358 ffff8801c8817b20 ffffffff82667541 [ 18.948545] ffff8801c892c370 ffffed003912586b ffffed003912586e ffff8801c892c368 [ 18.956533] dead4ead00000000 ffff8801c892c340 0000000000000000 0000000000000000 [ 18.964513] Call Trace: [ 18.967071] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 18.973532] [] sg_finish_rem_req+0x2b5/0x340 [ 18.979570] [] sg_new_read.isra.20+0x39/0x3e0 [ 18.985682] [] ? sg_get_rq_mark+0x142/0x190 [ 18.991630] [] sg_read+0x8bd/0x1440 [ 18.996876] [] ? save_stack_trace+0x16/0x20 [ 19.002818] [] ? save_stack+0x43/0xd0 [ 19.008234] [] ? kasan_slab_free+0x72/0xc0 [ 19.014087] [] ? kmem_cache_free+0xc7/0x300 [ 19.020027] [] ? putname+0xee/0x130 [ 19.025272] [] ? SyS_open+0x2d/0x40 [ 19.030529] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.037166] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 19.043976] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 19.050872] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.057507] [] __vfs_read+0x103/0x670 [ 19.062926] [] ? default_llseek+0x290/0x290 [ 19.068867] [] ? fsnotify+0x86/0xf30 [ 19.074201] [] ? fsnotify+0xf30/0xf30 [ 19.079621] [] ? avc_policy_seqno+0x9/0x20 [ 19.085476] [] ? selinux_file_permission+0x82/0x460 [ 19.092121] [] ? security_file_permission+0x89/0x1e0 [ 19.098839] [] ? rw_verify_area+0xe5/0x2b0 [ 19.104701] [] vfs_read+0x11e/0x380 [ 19.109956] [] SyS_read+0xd9/0x1b0 [ 19.115113] [] ? vfs_copy_file_range+0x740/0x740 [ 19.121489] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.128306] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 19.134869] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 19.141415] 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 [ 19.168072] RIP [] __free_pages+0x21/0x80 [ 19.173958] RSP [ 19.177937] ---[ end trace 8b18a1dbe71921ac ]--- [ 19.182821] Kernel panic - not syncing: Fatal exception [ 19.188668] Dumping ftrace buffer: [ 19.192188] (ftrace buffer empty) [ 19.195867] Kernel Offset: disabled [ 19.199465] Rebooting in 86400 seconds..