[v6.1] WARNING in nested_vmx_vmexit

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 79807e970724 Linux 6.1.190
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10138bc9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7771bcbc3c19eaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=4b87bead6f2de60d5be6
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/39d938c4c0d3/disk-79807e97.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0fe9d9eab441/vmlinux-79807e97.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b174304fdd81/bzImage-79807e97.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4b87be...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 11756 at arch/x86/kvm/vmx/nested.c:4785 nested_vmx_vmexit+0x1a15/0x2ce0 arch/x86/kvm/vmx/nested.c:4785
Modules linked in:
CPU: 0 PID: 11756 Comm: syz.3.2508 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:nested_vmx_vmexit+0x1a15/0x2ce0 arch/x86/kvm/vmx/nested.c:4785
Code: 84 24 00 01 00 00 0f 85 9a 03 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 85 7d 5c 00 e9 fe f4 ff ff e8 7b 7d 5c 00 <0f> 0b e9 f4 e6 ff ff 0f 1f 44 00 00 b8 00 44 00 00 4c 8b 64 24 18
RSP: 0018:ffffc900038974e0 EFLAGS: 00010287
RAX: ffffffff8125c905 RBX: ffff888019bd22db RCX: 0000000000080000
RDX: ffffc9000f873000 RSI: 0000000000009705 RDI: 0000000000009706
RBP: ffffc90003897630 R08: ffff888019bd003f R09: 1ffff1100337a007
R10: dffffc0000000000 R11: ffffed100337a008 R12: ffff888019bd0000
R13: dffffc0000000000 R14: ffff888019bd2270 R15: ffff888019bd0000
FS: 00007f44106a66c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000076083000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000001800
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
vcpu_enter_guest+0x4a14/0x7a90 arch/x86/kvm/x86.c:10695
vcpu_run arch/x86/kvm/x86.c:11125 [inline]
kvm_arch_vcpu_ioctl_run+0xf2c/0x22c0 arch/x86/kvm/x86.c:11349
kvm_vcpu_ioctl+0x986/0xd00 virt/kvm/kvm_main.c:4123
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f440f79e559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f44106a6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f440fa26090 RCX: 00007f440f79e559
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 00007f440f835ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f440fa26128 R14: 00007f440fa26090 R15: 00007ffd088ef468
</TASK>


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 79807e970724 Linux 6.1.190
git tree: linux-6.1.y

console output: https://syzkaller.appspot.com/x/log.txt?x=116d9031580000

kernel config: https://syzkaller.appspot.com/x/.config?x=7771bcbc3c19eaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=4b87bead6f2de60d5be6
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10692621580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f1b4e1580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/39d938c4c0d3/disk-79807e97.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0fe9d9eab441/vmlinux-79807e97.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b174304fdd81/bzImage-79807e97.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4b87be...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 0 PID: 4892 at arch/x86/kvm/vmx/nested.c:4785 nested_vmx_vmexit+0x1a15/0x2ce0 arch/x86/kvm/vmx/nested.c:4785
Modules linked in:
CPU: 0 PID: 4892 Comm: syz.2.97 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:nested_vmx_vmexit+0x1a15/0x2ce0 arch/x86/kvm/vmx/nested.c:4785
Code: 84 24 00 01 00 00 0f 85 9a 03 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 85 7d 5c 00 e9 fe f4 ff ff e8 7b 7d 5c 00 <0f> 0b e9 f4 e6 ff ff 0f 1f 44 00 00 b8 00 44 00 00 4c 8b 64 24 18

RSP: 0018:ffffc900060874e0 EFLAGS: 00010293
RAX: ffffffff8125c905 RBX: ffff88807e41f25b RCX: ffff8880764c0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88807e41f25c
RBP: ffffc90006087630 R08: ffff88807e41cfbf R09: 1ffff1100fc839f7
R10: dffffc0000000000 R11: ffffed100fc839f8 R12: ffff88807e41cf80
R13: dffffc0000000000 R14: ffff88807e41f1f0 R15: ffff88807e41cf80
FS: 00007f11f584b6c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000000 CR3: 0000000024c27000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:
<TASK>
vcpu_enter_guest+0x4a14/0x7a90 arch/x86/kvm/x86.c:10695
vcpu_run arch/x86/kvm/x86.c:11125 [inline]
kvm_arch_vcpu_ioctl_run+0xf2c/0x22c0 arch/x86/kvm/x86.c:11349
kvm_vcpu_ioctl+0x986/0xd00 virt/kvm/kvm_main.c:4123
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f11f499e559

Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007f11f584b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f11f4c26090 RCX: 00007f11f499e559

RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006

RBP: 00007f11f4a35ab8 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007f11f4c26128 R14: 00007f11f4c26090 R15: 00007ffde6492708
</TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 792fbe1537d8 Linux 5.15.223
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=167dcc95580000
kernel config: https://syzkaller.appspot.com/x/.config?x=24e573deff4d39b7
dashboard link: https://syzkaller.appspot.com/bug?extid=7396a93eb054daf46b01

compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ac7c54df9a60/disk-792fbe15.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d6a042e367f4/vmlinux-792fbe15.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a3fa0a6dba38/bzImage-792fbe15.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+7396a9...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5251 at arch/x86/kvm/vmx/nested.c:4582 nested_vmx_vmexit+0x18fb/0x2910 arch/x86/kvm/vmx/nested.c:4582
Modules linked in:
CPU: 1 PID: 5251 Comm: syz.4.348 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:nested_vmx_vmexit+0x18fb/0x2910 arch/x86/kvm/vmx/nested.c:4582
Code: 84 24 00 01 00 00 0f 85 65 03 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 bf 21 56 00 e9 d8 f5 ff ff e8 b5 21 56 00 <0f> 0b e9 ee e7 ff ff 0f 1f 44 00 00 b8 00 44 00 00 0f 78 c0 3e 77
RSP: 0018:ffffc90002f97b40 EFLAGS: 00010283
RAX: ffffffff812301ab RBX: ffff888079d427b9 RCX: 0000000000080000
RDX: ffffc9000603a000 RSI: 0000000000002cde RDI: 0000000000002cdf
RBP: ffffc90002f97c90 R08: ffff888079d4003f R09: 1ffff1100f3a8007
R10: dffffc0000000000 R11: ffffed100f3a8008 R12: ffff888079d40038
R13: dffffc0000000000 R14: ffff888079d40000 R15: ffff888079d40000
FS: 00007f939c99a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f04562c0158 CR3: 000000005f1ee000 CR4: 00000000003526e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>

kvm_check_nested_events arch/x86/kvm/x86.c:9151 [inline]
kvm_vcpu_running arch/x86/kvm/x86.c:10169 [inline]
vcpu_run arch/x86/kvm/x86.c:10191 [inline]
kvm_arch_vcpu_ioctl_run+0x6db/0x1e40 arch/x86/kvm/x86.c:10432
kvm_vcpu_ioctl+0x8f2/0xc10 virt/kvm/kvm_main.c:3895
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f939e742559

Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007f939c99a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f939e9c9fa0 RCX: 00007f939e742559
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f939e7d9ad8 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007f939e9ca038 R14: 00007f939e9c9fa0 R15: 00007ffe677125f8