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* kernel BUG at arch/x86/kvm/mmu.c:LINE! (2)
@ 2019-11-08 19:14 syzbot
  2019-11-08 19:42 ` Paolo Bonzini
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2019-11-08 19:14 UTC (permalink / raw)
  To: abbotti, bp, devel, gregkh, hpa, hsweeten, jmattson, joro, kvm,
	linux-kernel, mingo, olsonse, pbonzini, rkrcmar,
	sean.j.christopherson, syzkaller-bugs, tglx, vkuznets, wanpengli,
	x86

Hello,

syzbot found the following crash on:

HEAD commit:    847120f8 Merge branch 'for-linus' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12d60164e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5e2eca3f31f9bf
dashboard link: https://syzkaller.appspot.com/bug?extid=824609cfabee9c6e153c
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16e2a12ce00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13314994e00000

The bug was bisected to:

commit 1ffe8bdc09f8bfcaad76d71ae68b623c7e03f20f
Author: Spencer E. Olson <olsonse@umich.edu>
Date:   Mon Oct 10 14:14:19 2016 +0000

     staging: comedi: ni_mio_common: split out ao arming from ni_ao_inttrig

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=122977fae00000
console output: https://syzkaller.appspot.com/x/log.txt?x=162977fae00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+824609cfabee9c6e153c@syzkaller.appspotmail.com
Fixes: 1ffe8bdc09f8 ("staging: comedi: ni_mio_common: split out ao arming  
from ni_ao_inttrig")

L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and  
https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for  
details.
------------[ cut here ]------------
kernel BUG at arch/x86/kvm/mmu.c:3324!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8688 Comm: syz-executor906 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:transparent_hugepage_adjust+0x490/0x530 arch/x86/kvm/mmu.c:3324
Code: 63 00 48 8b 45 b8 48 83 e8 01 e9 19 fd ff ff e8 36 3c 63 00 48 8b 45  
b8 48 83 e8 01 48 89 45 c8 e9 a1 fd ff ff e8 20 3c 63 00 <0f> 0b 48 89 df  
e8 66 9e 9e 00 e9 9f fb ff ff 4c 89 ff e8 59 9e 9e
RSP: 0018:ffff88809753f690 EFLAGS: 00010293
RAX: ffff88809549e6c0 RBX: ffff88809753f778 RCX: ffffffff810fe787
RDX: 0000000000000000 RSI: ffffffff810fe8c0 RDI: 0000000000000007
RBP: ffff88809753f6d8 R08: ffff88809549e6c0 R09: ffffed10131ed682
R10: ffffed10131ed681 R11: ffff888098f6b40b R12: ffff88809753f768
R13: 0000000000000083 R14: 000000000008fe81 R15: 0000000000000000
FS:  000000000158e880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009f2a4000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  tdp_page_fault+0x56e/0x650 arch/x86/kvm/mmu.c:4216
  kvm_mmu_page_fault+0x1dd/0x1800 arch/x86/kvm/mmu.c:5439
  handle_ept_violation+0x259/0x560 arch/x86/kvm/vmx/vmx.c:5185
  vmx_handle_exit+0x29f/0x1730 arch/x86/kvm/vmx/vmx.c:5929
  vcpu_enter_guest arch/x86/kvm/x86.c:8227 [inline]
  vcpu_run arch/x86/kvm/x86.c:8291 [inline]
  kvm_arch_vcpu_ioctl_run+0x1cb8/0x70d0 arch/x86/kvm/x86.c:8498
  kvm_vcpu_ioctl+0x4dc/0xfc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2772
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x443f49
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd991d67d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443f49
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0
R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000401c50
R13: 0000000000401ce0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 911095bae56804bc ]---
RIP: 0010:transparent_hugepage_adjust+0x490/0x530 arch/x86/kvm/mmu.c:3324
Code: 63 00 48 8b 45 b8 48 83 e8 01 e9 19 fd ff ff e8 36 3c 63 00 48 8b 45  
b8 48 83 e8 01 48 89 45 c8 e9 a1 fd ff ff e8 20 3c 63 00 <0f> 0b 48 89 df  
e8 66 9e 9e 00 e9 9f fb ff ff 4c 89 ff e8 59 9e 9e
RSP: 0018:ffff88809753f690 EFLAGS: 00010293
RAX: ffff88809549e6c0 RBX: ffff88809753f778 RCX: ffffffff810fe787
RDX: 0000000000000000 RSI: ffffffff810fe8c0 RDI: 0000000000000007
RBP: ffff88809753f6d8 R08: ffff88809549e6c0 R09: ffffed10131ed682
R10: ffffed10131ed681 R11: ffff888098f6b40b R12: ffff88809753f768
R13: 0000000000000083 R14: 000000000008fe81 R15: 0000000000000000
FS:  000000000158e880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009f2a4000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
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2019-11-08 19:14 kernel BUG at arch/x86/kvm/mmu.c:LINE! (2) syzbot
2019-11-08 19:42 ` Paolo Bonzini

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