[syzbot] [kvm?] WARNING in kvm_arch_vcpu_ioctl_run (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ee3f96b16468 Merge tag 'nfsd-6.3-1' of git://git.kernel.or..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11622f64c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=cab35c936731a347
dashboard link: https://syzkaller.appspot.com/bug?extid=8accb43ddc6bd1f5713a
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15bd61acc80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17402eb0c80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a7ac3e540d6d/disk-ee3f96b1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/604b5042d73d/vmlinux-ee3f96b1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5a6d400b42b5/bzImage-ee3f96b1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8accb4...@syzkaller.appspotmail.com

kvm_intel: KVM_SET_TSS_ADDR needs to be called before running vCPU
kvm_intel: set kvm_intel.dump_invalid_vmcs=1 to dump internal KVM state.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5082 at arch/x86/kvm/x86.c:11060 kvm_arch_vcpu_ioctl_run+0x2464/0x2af0 arch/x86/kvm/x86.c:11060
Modules linked in:
CPU: 0 PID: 5082 Comm: syz-executor178 Not tainted 6.2.0-syzkaller-13115-gee3f96b16468 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x2464/0x2af0 arch/x86/kvm/x86.c:11060
Code: 74 c3 00 e9 2f de ff ff 48 c7 c7 80 45 78 8e e8 02 74 c3 00 e9 a9 dc ff ff e8 38 f8 71 00 0f 0b e9 6c e0 ff ff e8 2c f8 71 00 <0f> 0b e9 a4 e0 ff ff e8 20 f8 71 00 be 08 00 00 00 65 48 8b 1c 25
RSP: 0018:ffffc90003b4fcb0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8880236e0000 RSI: ffffffff81130274 RDI: 0000000000000005
RBP: ffff888021798000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90003bfac90 R14: ffff88802319a8c0 R15: ffff8880217982ec
FS: 000055555600f300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000073d95000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kvm_vcpu_ioctl+0x574/0xfe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4099
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff9dc1b2289
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcad58a378 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff9dc1b2289
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007ff9dc175ce0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff9dc175d70
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>


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[Sean Christopherson]

Same thing reported by another syzkaller instance, I'll post fixes in the not too
distant future.

https://lore.kernel.org/all/ZBNrWZQh...@google.com