[....] Starting enhanced syslogd: rsyslogd[ 13.273526] audit: type=1400 audit(1517234317.168:4): avc: denied { syslog } for pid=3801 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 '10.128.0.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.753340] kasan: CONFIG_KASAN_INLINE enabled [ 28.757977] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.765323] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.771526] Dumping ftrace buffer: [ 28.775033] (ftrace buffer empty) [ 28.778713] Modules linked in: [ 28.781994] CPU: 1 PID: 3958 Comm: syzkaller057661 Not tainted 4.9.78-g68d447c #23 [ 28.789706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.799037] task: ffff8801d9626000 task.stack: ffff8801d5240000 [ 28.805064] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 28.813333] RSP: 0018:ffff8801d5247ab0 EFLAGS: 00010a07 [ 28.818752] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826676fb [ 28.826006] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.833260] RBP: ffff8801d5247ac0 R08: 0000000000000001 R09: 0000000000000001 [ 28.840508] R10: 0000000000000000 R11: ffff8801d9626000 R12: 0000000000000004 [ 28.847750] R13: 0000000000000020 R14: ffff8801d534a100 R15: dffffc0000000000 [ 28.854992] FS: 0000000002160880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.863202] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.869052] CR2: 0000000020919000 CR3: 00000001d9184000 CR4: 0000000000160670 [ 28.876295] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.883541] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.890778] Stack: [ 28.892895] ffffffff838b37a9 ffff8801d534a258 ffff8801d5247b20 ffffffff82667721 [ 28.900868] ffff8801d534a270 ffffed003aa6944b ffffed003aa6944e ffff8801d534a268 [ 28.908851] dead4ead00000000 ffff8801d534a240 0000000000000000 0000000000000000 [ 28.916819] Call Trace: [ 28.919381] [] ? retint_kernel+0x2d/0x2d [ 28.925065] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 28.931614] [] sg_finish_rem_req+0x2b5/0x340 [ 28.937640] [] sg_new_read.isra.20+0x356/0x3e0 [ 28.943846] [] ? sg_get_rq_mark+0x17c/0x190 [ 28.949790] [] sg_read+0x8b7/0x1440 [ 28.955039] [] ? save_stack_trace+0x16/0x20 [ 28.960992] [] ? save_stack+0x43/0xd0 [ 28.966414] [] ? kasan_slab_free+0x72/0xc0 [ 28.972291] [] ? kmem_cache_free+0xc7/0x300 [ 28.978243] [] ? putname+0xee/0x130 [ 28.983493] [] ? SyS_open+0x2d/0x40 [ 28.988752] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 28.995392] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 29.002204] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 29.009106] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 29.015746] [] __vfs_read+0x103/0x670 [ 29.021174] [] ? default_llseek+0x290/0x290 [ 29.027125] [] ? fsnotify+0x86/0xf30 [ 29.032458] [] ? fsnotify+0xf30/0xf30 [ 29.037884] [] ? avc_policy_seqno+0x9/0x20 [ 29.043743] [] ? selinux_file_permission+0x82/0x460 [ 29.050388] [] ? security_file_permission+0x89/0x1e0 [ 29.057111] [] ? rw_verify_area+0xe5/0x2b0 [ 29.062968] [] vfs_read+0x11e/0x380 [ 29.068225] [] SyS_read+0xd9/0x1b0 [ 29.073386] [] ? vfs_copy_file_range+0x740/0x740 [ 29.079764] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.086582] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.093139] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 29.099689] 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 [ 29.126363] RIP [] __free_pages+0x21/0x80 [ 29.132255] RSP [ 29.136180] ---[ end trace 496d3803ece622bd ]--- [ 29.141005] Kernel panic - not syncing: Fatal exception [ 29.146728] Dumping ftrace buffer: [ 29.150242] (ftrace buffer empty) [ 29.153922] Kernel Offset: disabled [ 29.157530] Rebooting in 86400 seconds..