linux-kernel - WARNING in handle_ept

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Date:   Tue, 06 Feb 2018 00:30:01 -0800
From:   syzbot 
        <syzbot+c1d9517cab094dae65e446c0c5b4de6c40f4dc58@...kaller.appspotmail.com>
To:     dvyukov@...gle.com, 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 handle_ept_misconfig

syzbot has found reproducer for the following crash on upstream commit
2deb41b245320f0eefb535a5c8ea19ed66b33c04 (Mon Feb 5 18:07:40 2018 +0000)
Merge tag 'rproc-v4.16' of git://github.com/andersson/remoteproc

So far this crash happened 234 times on linux-next, mmots, upstream.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by:  
syzbot+c1d9517cab094dae65e446c0c5b4de6c40f4dc58@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed.

WARNING: CPU: 0 PID: 4187 at arch/x86/kvm/vmx.c:6771  
handle_ept_misconfig+0x140/0x520 arch/x86/kvm/vmx.c:6771
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4187 Comm: syzkaller225100 Not tainted 4.15.0+ #298
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:53
  panic+0x1e4/0x41c kernel/panic.c:183
  __warn+0x1dc/0x200 kernel/panic.c:547
  report_bug+0x211/0x2d0 lib/bug.c:184
  fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
  fixup_bug arch/x86/kernel/traps.c:247 [inline]
  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
  invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:984
RIP: 0010:handle_ept_misconfig+0x140/0x520 arch/x86/kvm/vmx.c:6771
RSP: 0018:ffff8801b2807360 EFLAGS: 00010293
RAX: ffff8801b2a16740 RBX: 1ffff10036500e6e RCX: ffffffff81193de0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed0036500e58
RBP: ffff8801b2807438 R08: 0000000000000007 R09: ffff8801b28071d8
R10: ffff8801b2806f30 R11: 0000000000000002 R12: ffff8801c5618480
R13: 00000000fffffff2 R14: ffff8801b2807410 R15: dffffc0000000000
  vmx_handle_exit+0x25d/0x1ce0 arch/x86/kvm/vmx.c:8955
  vcpu_enter_guest arch/x86/kvm/x86.c:7083 [inline]
  vcpu_run arch/x86/kvm/x86.c:7145 [inline]
  kvm_arch_vcpu_ioctl_run+0x1c69/0x5bf0 arch/x86/kvm/x86.c:7312
  kvm_vcpu_ioctl+0x64c/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2564
  vfs_ioctl fs/ioctl.c:46 [inline]
  do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
  SYSC_ioctl fs/ioctl.c:701 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
  do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x448a79
RSP: 002b:00007ff13702fda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006ddc3c RCX: 0000000000448a79
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 000000000000011b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc38
R13: 6d766b2f7665642f R14: 00007ff1370309c0 R15: 000000000000000d
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


View attachment "raw.log.txt" of type "text/plain" (10075 bytes)

View attachment "repro.syz.txt" of type "text/plain" (1230 bytes)

View attachment "repro.c.txt" of type "text/plain" (40257 bytes)

View attachment "config.txt" of type "text/plain" (136942 bytes)