linux-kernel - [syzbot] [kvm?] WARNING in __kvm_gpc

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Message-ID: <6776570e.050a0220.3a8527.0036.GAE@google.com>
Date: Thu, 02 Jan 2025 01:06:22 -0800
From: syzbot <syzbot+cde12433b6c56f55d9ed@...kaller.appspotmail.com>
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, pbonzini@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [kvm?] WARNING in __kvm_gpc_refresh (3)

Hello,

syzbot found the following issue on:

HEAD commit:    059dd502b263 Merge tag 'block-6.13-20241228' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13c9b2c4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=aa8dc22aa6de51f5
dashboard link: https://syzkaller.appspot.com/bug?extid=cde12433b6c56f55d9ed
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-059dd502.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2125981e6709/vmlinux-059dd502.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ffdf1326e5e4/bzImage-059dd502.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cde12433b6c56f55d9ed@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 3 PID: 6643 at arch/x86/kvm/../../../virt/kvm/pfncache.c:267 __kvm_gpc_refresh+0x174b/0x2390 virt/kvm/pfncache.c:267
Modules linked in:
CPU: 3 UID: 0 PID: 6643 Comm: syz.1.195 Not tainted 6.13.0-rc4-syzkaller-00078-g059dd502b263 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__kvm_gpc_refresh+0x174b/0x2390 virt/kvm/pfncache.c:267
Code: c1 ea 03 80 3c 02 00 0f 85 dc 09 00 00 48 8b 3c 24 49 89 9f 08 01 00 00 31 db e8 30 20 14 0a e9 44 f4 ff ff e8 b6 e7 81 00 90 <0f> 0b 90 e9 31 f4 ff ff 4c 8b 7c 24 60 e8 a3 e7 81 00 31 db e9 e5
RSP: 0018:ffffc90004aa7230 EFLAGS: 00010283
RAX: 00000000000008c2 RBX: ffffffffffffffff RCX: ffffc90007221000
RDX: 0000000000080000 RSI: ffffffff81182dfa RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: ffffffff961eaed8 R12: ffff888000000000
R13: ffffc90005c4a401 R14: ffff887fffffff01 R15: ffffc90005c4a408
FS:  00007f0d642716c0(0000) GS:ffff88806a900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000053494000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_gpc_refresh+0xc3/0x140 virt/kvm/pfncache.c:382
 kvm_xen_set_evtchn.part.0+0x19c/0x270 arch/x86/kvm/xen.c:1878
 kvm_xen_set_evtchn arch/x86/kvm/xen.c:1968 [inline]
 kvm_xen_hvm_evtchn_send+0x231/0x290 arch/x86/kvm/xen.c:1958
 kvm_arch_vm_ioctl+0x119b/0x1d10 arch/x86/kvm/x86.c:7256
 kvm_vm_ioctl+0x1a87/0x3df0 virt/kvm/kvm_main.c:5241
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl fs/ioctl.c:892 [inline]
 __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d63385d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0d64271038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0d63575fa0 RCX: 00007f0d63385d29
RDX: 0000000020000180 RSI: 00000000400caed0 RDI: 0000000000000006
RBP: 00007f0d63401b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0d63575fa0 R15: 00007fff66828448
 </TASK>


---
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