linux-kernel - WARNING in __x86_set_memory

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Message-ID: <94eb2c1886e44a19f9055cd7871c@google.com>
Date:   Tue, 31 Oct 2017 06:14:01 -0700
From:   syzbot 
        <bot+cdc101da2b51ccd9d68d92a29a64a620ed313891@...kaller.appspotmail.com>
To:     hpa@...or.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, pbonzini@...hat.com, rkrcmar@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: WARNING in __x86_set_memory_region

Hello,

syzkaller hit the following crash on  
0a07b238e5f488b459b6113a62e06b6aab017f71
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.

syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


------------[ cut here ]------------
WARNING: CPU: 1 PID: 6842 at arch/x86/kvm/x86.c:8152  
__x86_set_memory_region+0x541/0x6c0 arch/x86/kvm/x86.c:8152
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6842 Comm: syz-executor7 Not tainted 4.13.0-rc2+ #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:16 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:52
  panic+0x1e4/0x417 kernel/panic.c:180
  __warn+0x1c4/0x1d9 kernel/panic.c:541
  report_bug+0x211/0x2d0 lib/bug.c:183
  fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:190
  do_trap_no_signal arch/x86/kernel/traps.c:224 [inline]
  do_trap+0x260/0x390 arch/x86/kernel/traps.c:273
  do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:310
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323
  invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:846
RIP: 0010:__x86_set_memory_region+0x541/0x6c0 arch/x86/kvm/x86.c:8152
RSP: 0018:ffff8801d39277f0 EFLAGS: 00010297
RAX: ffff8801c26ee100 RBX: ffff8801d39278c0 RCX: 1ffff100384ddd2e
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000286
RBP: ffff8801d39278e8 R08: 0000000000000001 R09: 1ffff1003a724eb9
R10: ffff8801d3927590 R11: 0000000000000001 R12: ffff8801d3927880
R13: 1ffff1003a724f04 R14: 00000000000101ff R15: 0000000000000000
  x86_set_memory_region+0x3e/0x60 arch/x86/kvm/x86.c:8164
  kvm_arch_destroy_vm+0x7c4/0x990 arch/x86/kvm/x86.c:8180
  kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:770 [inline]
  kvm_put_kvm+0x5d7/0xa90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:792
  kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2412
  __fput+0x327/0x7e0 fs/file_table.c:210
  ____fput+0x15/0x20 fs/file_table.c:246
  task_work_run+0x18a/0x260 kernel/task_work.c:116
  tracehook_notify_resume include/linux/tracehook.h:191 [inline]
  exit_to_usermode_loop+0x26d/0x2d0 arch/x86/entry/common.c:161
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath+0x3a7/0x450 arch/x86/entry/common.c:263
  entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x4512c9
RSP: 002b:00007f7577010c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000021
RAX: 000000000000000a RBX: 0000000000718000 RCX: 00000000004512c9
RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000007
RBP: 00000000000004b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b6699
R13: 00000000ffffffff R14: 0000000000000007 R15: 000000000000000a
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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See https://goo.gl/tpsmEJ for details.
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