[....] Starting enhanced syslogd: rsyslogd[ 10.777420] audit: type=1400 audit(1514953068.916:4): avc: denied { syslog } for pid=3169 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 '10.128.0.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.831505] kasan: CONFIG_KASAN_INLINE enabled [ 19.832226] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.833204] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.834053] Dumping ftrace buffer: [ 19.834551] (ftrace buffer empty) [ 19.835064] Modules linked in: [ 19.835534] CPU: 0 PID: 3318 Comm: syzkaller609066 Not tainted 4.9.74-g9e5dd8e #12 [ 19.836558] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.837788] task: ffff8801cb680000 task.stack: ffff8801c91d8000 [ 19.838582] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.839690] RSP: 0018:ffff8801c91dfa50 EFLAGS: 00010a07 [ 19.840424] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826649fb [ 19.841402] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.842351] RBP: ffff8801c91dfa60 R08: 0000000000000001 R09: 0000000000000000 [ 19.843311] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.844262] R13: 0000000000000020 R14: ffff8801c8cf8000 R15: dffffc0000000000 [ 19.845215] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000090e9840 [ 19.846319] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.847090] CR2: 0000000020001000 CR3: 00000001c8f91000 CR4: 00000000001606f0 [ 19.848073] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.849038] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.849986] Stack: [ 19.850281] ffff8801cb680000 ffff8801c8cf8158 ffff8801c91dfac0 ffffffff82664a21 [ 19.851425] ffff8801c8cf8170 ffffed003919f02b ffffed003919f02e ffff8801c8cf8168 [ 19.858331] dead4ead00000000 ffff8801c8cf8140 0000000000000000 0000000000000000 [ 19.866279] Call Trace: [ 19.868833] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.875289] [] sg_finish_rem_req+0x2b5/0x340 [ 19.881312] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.887429] [] ? sg_get_rq_mark+0x142/0x190 [ 19.893364] [] sg_read+0x8bd/0x1440 [ 19.898605] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.905244] [] ? lru_cache_add+0xd9/0x1e0 [ 19.911008] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 19.918075] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.924707] [] __vfs_read+0x103/0x670 [ 19.930120] [] ? default_llseek+0x290/0x290 [ 19.936054] [] ? fsnotify+0x86/0xf30 [ 19.941381] [] ? fsnotify+0xf30/0xf30 [ 19.946798] [] ? avc_policy_seqno+0x9/0x20 [ 19.952647] [] ? selinux_file_permission+0x82/0x460 [ 19.959275] [] ? security_file_permission+0x89/0x1e0 [ 19.965995] [] ? rw_verify_area+0xe5/0x2b0 [ 19.971848] [] vfs_read+0x11e/0x380 [ 19.977087] [] SyS_read+0xd9/0x1b0 [ 19.982240] [] ? vfs_copy_file_range+0x740/0x740 [ 19.988615] [] ? do_fast_syscall_32+0xcf/0x890 [ 19.994815] [] ? vfs_copy_file_range+0x740/0x740 [ 20.001184] [] do_fast_syscall_32+0x2f7/0x890 [ 20.007291] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.013923] [] entry_SYSENTER_compat+0x51/0x60 [ 20.020116] 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 [ 20.046401] RIP [] __free_pages+0x21/0x80 [ 20.052283] RSP [ 20.056196] ---[ end trace f84294db4132fb77 ]--- [ 20.060943] Kernel panic - not syncing: Fatal exception [ 20.066671] Dumping ftrace buffer: [ 20.070186] (ftrace buffer empty) [ 20.073870] Kernel Offset: disabled [ 20.077460] Rebooting in 86400 seconds..