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SubjectWARNING in handle_desc
From
Hello,

syzbot found the following crash on:

HEAD commit: 6d028043 Add linux-next specific files for 20190830
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14467cf6600000
kernel config: https://syzkaller.appspot.com/x/.config?x=82a6bec43ab0cb69
dashboard link: https://syzkaller.appspot.com/bug?extid=0f1819555fbdce992df9
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12475285600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=138efb99600000

The bug was bisected to:

commit 0367f205a3b7c0efe774634eef1f4697c79a4132
Author: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue Jul 12 08:44:55 2016 +0000

KVM: vmx: add support for emulating UMIP

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1791cd6e600000
final crash: https://syzkaller.appspot.com/x/report.txt?x=1451cd6e600000
console output: https://syzkaller.appspot.com/x/log.txt?x=1051cd6e600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0f1819555fbdce992df9@syzkaller.appspotmail.com
Fixes: 0367f205a3b7 ("KVM: vmx: add support for emulating UMIP")

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 ]------------
WARNING: CPU: 0 PID: 8759 at arch/x86/kvm/vmx/vmx.c:4688
handle_desc+0x78/0x90 arch/x86/kvm/vmx/vmx.c:4688
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8759 Comm: syz-executor328 Not tainted 5.3.0-rc6-next-20190830
#75
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
panic+0x2dc/0x755 kernel/panic.c:220
__warn.cold+0x2f/0x3c kernel/panic.c:581
report_bug+0x289/0x300 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:handle_desc+0x78/0x90 arch/x86/kvm/vmx/vmx.c:4688
Code: 59 00 31 f6 4c 89 e7 e8 26 d5 f4 ff 31 ff 41 89 c4 89 c6 e8 ca 16 59
00 31 c0 45 85 e4 5b 0f 94 c0 41 5c 5d c3 e8 38 15 59 00 <0f> 0b eb cf e8
1f f6 93 00 eb ab 0f 1f 00 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffff8880981c79a0 EFLAGS: 00010293
RAX: ffff88809997e000 RBX: 0000000000000000 RCX: ffffffff811940a6
RDX: 0000000000000000 RSI: ffffffff811940d8 RDI: 0000000000000007
RBP: ffff8880981c79b0 R08: ffff88809997e000 R09: ffffed1015d06aed
R10: ffffed1015d06aec R11: ffff8880ae835763 R12: ffff888097628040
R13: 000000000000002f R14: ffff88809762bc0c R15: ffff888097628070
vmx_handle_exit+0x299/0x15f0 arch/x86/kvm/vmx/vmx.c:5896
vcpu_enter_guest+0x1087/0x6200 arch/x86/kvm/x86.c:8105
vcpu_run arch/x86/kvm/x86.c:8169 [inline]
kvm_arch_vcpu_ioctl_run+0x424/0x1750 arch/x86/kvm/x86.c:8377
kvm_vcpu_ioctl+0x4dc/0xf50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2764
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: 0033:0x443819
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 1b 0c fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd0b551188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffd0b551190 RCX: 0000000000443819
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 0000000000000000 R08: 00000000004010a0 R09: 00000000004010a0
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004048c0
R13: 0000000000404950 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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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