[syzbot] [pci?] upstream test error: general protection fault in msix_prepare_msi_desc

[syzbot <syzbot+8423775fd52d4cc7e5c9@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    f6e0150b2003 Merge tag 'mtd/for-6.15' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12bf5804580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4444a7da3861fcf5
dashboard link: https://syzkaller.appspot.com/bug?extid=8423775fd52d4cc7e5c9
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9113c1eac62e/disk-f6e0150b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f1dd0f2f5338/vmlinux-f6e0150b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b275479ad610/bzImage-f6e0150b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8423775fd52d4cc7e5c9@syzkaller.appspotmail.com

ntfs3: Enabled Linux POSIX ACLs support
ntfs3: Read-only LZX/Xpress compression included
efs: 1.0a - http://aeschi.ch.eu.org/efs/
jffs2: version 2.2. (NAND) (SUMMARY)  © 2001-2006 Red Hat, Inc.
romfs: ROMFS MTD (C) 2007 Red Hat, Inc.
QNX4 filesystem 0.2.3 registered.
qnx6: QNX6 filesystem 1.0.0 registered.
fuse: init (API version 7.42)
orangefs_debugfs_init: called with debug mask: :none: :0:
orangefs_init: module version upstream loaded
JFS: nTxBlock = 8192, nTxLock = 65536
SGI XFS with ACLs, security attributes, realtime, quota, no debug enabled
9p: Installing v9fs 9p2000 file system support
NILFS version 2 loaded
befs: version: 0.9.3
ocfs2: Registered cluster interface o2cb
ocfs2: Registered cluster interface user
OCFS2 User DLM kernel interface loaded
gfs2: GFS2 installed
ceph: loaded (mds proto 32)
NET: Registered PF_ALG protocol family
xor: automatically using best checksumming function   avx       
async_tx: api initialized (async)
Key type asymmetric registered
Asymmetric key parser 'x509' registered
Asymmetric key parser 'pkcs8' registered
Key type pkcs7_test registered
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 238)
io scheduler mq-deadline registered
io scheduler kyber registered
io scheduler bfq registered
input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
ACPI: button: Power Button [PWRF]
input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input1
ACPI: button: Sleep Button [SLPF]
ioatdma: Intel(R) QuickData Technology Driver 5.00
ACPI: \_SB_.LNKC: Enabled at IRQ 11
virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver
ACPI: \_SB_.LNKD: Enabled at IRQ 10
virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver
ACPI: \_SB_.LNKB: Enabled at IRQ 10
virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver
virtio-pci 0000:00:07.0: virtio_pci: leaving for legacy driver
N_HDLC line discipline registered with maxframe=4096
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
00:05: ttyS2 at I/O 0x3e8 (irq = 6, base_baud = 115200) is a 16550A
00:06: ttyS3 at I/O 0x2e8 (irq = 7, base_baud = 115200) is a 16550A
Non-volatile memory driver v1.3
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.14.0-syzkaller-03565-gf6e0150b2003 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:msix_prepare_msi_desc+0x18a/0x310 drivers/pci/msi/msi.c:615
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7f 01 00 00 4c 89 ea 4c 89 63 60 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e fd 00 00 00 41 8b 6d 00 31 ff
RSP: 0000:ffffc900000674f8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffc90000067588 RCX: ffffffff8501ef7f
RDX: 0000000000000000 RSI: ffffffff8501eb05 RDI: ffffc900000675e8
RBP: ffff888021efe000 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000002ba3 R12: ffffc9000008e008
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124e5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823ffff000 CR3: 000000000df82000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 msix_setup_msi_descs+0x19c/0x260 drivers/pci/msi/msi.c:639
 __msix_setup_interrupts drivers/pci/msi/msi.c:672 [inline]
 msix_setup_interrupts drivers/pci/msi/msi.c:701 [inline]
 msix_capability_init drivers/pci/msi/msi.c:743 [inline]
 __pci_enable_msix_range+0x90f/0x1150 drivers/pci/msi/msi.c:851
 pci_alloc_irq_vectors_affinity+0x238/0x2a0 drivers/pci/msi/api.c:268
 vp_request_msix_vectors drivers/virtio/virtio_pci_common.c:160 [inline]
 vp_find_vqs_msix+0x423/0xea0 drivers/virtio/virtio_pci_common.c:417
 vp_find_vqs+0x96/0x7a0 drivers/virtio/virtio_pci_common.c:525
 virtio_find_vqs include/linux/virtio_config.h:226 [inline]
 virtio_find_single_vq include/linux/virtio_config.h:237 [inline]
 probe_common+0x324/0x700 drivers/char/hw_random/virtio-rng.c:155
 virtio_dev_probe+0x586/0x8a0 drivers/virtio/virtio.c:341
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x23e/0xa90 drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
 __driver_attach+0x283/0x580 drivers/base/dd.c:1216
 bus_for_each_dev+0x13b/0x1d0 drivers/base/bus.c:370
 bus_add_driver+0x2e9/0x690 drivers/base/bus.c:678
 driver_register+0x15c/0x4b0 drivers/base/driver.c:249
 do_one_initcall+0x120/0x6e0 init/main.c:1257
 do_initcall_level init/main.c:1319 [inline]
 do_initcalls init/main.c:1335 [inline]
 do_basic_setup init/main.c:1354 [inline]
 kernel_init_freeable+0x5c2/0x900 init/main.c:1567
 kernel_init+0x1c/0x2b0 init/main.c:1457
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:msix_prepare_msi_desc+0x18a/0x310 drivers/pci/msi/msi.c:615
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7f 01 00 00 4c 89 ea 4c 89 63 60 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e fd 00 00 00 41 8b 6d 00 31 ff
RSP: 0000:ffffc900000674f8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffc90000067588 RCX: ffffffff8501ef7f
RDX: 0000000000000000 RSI: ffffffff8501eb05 RDI: ffffc900000675e8
RBP: ffff888021efe000 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000002ba3 R12: ffffc9000008e008
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124f5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000df82000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	fa                   	cli
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   c:	0f 85 7f 01 00 00    	jne    0x191
  12:	4c 89 ea             	mov    %r13,%rdx
  15:	4c 89 63 60          	mov    %r12,0x60(%rbx)
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 c1 ea 03          	shr    $0x3,%rdx
* 27:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2b:	84 c0                	test   %al,%al
  2d:	74 08                	je     0x37
  2f:	3c 03                	cmp    $0x3,%al
  31:	0f 8e fd 00 00 00    	jle    0x134
  37:	41 8b 6d 00          	mov    0x0(%r13),%ebp
  3b:	31 ff                	xor    %edi,%edi


---
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