[syzbot] [pci?] BUG: unable to handle kernel paging request in pci_resource_io

[syzbot <syzbot+7134530b25073b4ef373@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    ba5cc80fd326 Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=10a6afb9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ccf4bea59f67007
dashboard link: https://syzkaller.appspot.com/bug?extid=7134530b25073b4ef373
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16f4a132580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1398efb9580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/959ad5f4e730/disk-ba5cc80f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0787d25f251e/vmlinux-ba5cc80f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2e85c36fabac/Image-ba5cc80f.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7134530b25073b4ef373@syzkaller.appspotmail.com

Unable to handle kernel paging request at virtual address ffffffffc0801001
KASAN: maybe wild-memory-access in range [0
KASAN: maybe wild-memory-access in range [0x0003fffe04008008-0x0003fffe0400800f]
Mem abort info:
  ESR = 0x0000000096000061
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x21: alignment fault
Data abort info:
  ISV = 0, ISS = 0x00000061, ISS2 = 0x00000000
  CM = 0, WnR = 1, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000021b036000
[ffffffffc0801001] pgd=0000000000000000, p4d=0000000221322403, pud=0000000221323403, pmd=1000000102b2a403, pte=00f800003eff1713
Internal error: Oops: 0000000096000061 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 4917 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __raw_writew arch/arm64/include/asm/io.h:36 [inline]
pc : _outw include/asm-generic/io.h:650 [inline]
pc : logic_outw+0x58/0x124 lib/logic_pio.c:305
lr : _outw include/asm-generic/io.h:649 [inline]
lr : logic_outw+0x48/0x124 lib/logic_pio.c:305
sp : ffff800098937980
x29: ffff800098937980 x28: ffff800098937b88 x27: 1fffe0001a6e7a00
x26: dfff800000000000 x25: 0000000000000100 x24: 0000000000001002
x23: 000000000000101f x22: 0000000000001001 x21: 0000000000ffbfff
x20: 0000000000001001 x19: 0000000000000002 x18: 0000000000000000
x17: ffff800080c9e010 x16: ffff800080c9ded4 x15: 00000000200000c0
x14: ffff800080f03ea0 x13: 0000000000000001 x12: ffff0000c4881d40
x11: 00000000685d429e x10: 000000000000007f x9 : 0000000000000000
x8 : ffffffffc0801001 x7 : ffff800080f080b4 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000002 x3 : ffff800086896aa8
x2 : 0000000000001001 x1 : ffff0000c4881d40 x0 : 0000000000000000
Call trace:
 _outw include/asm-generic/io.h:650 [inline] (P)
 logic_outw+0x58/0x124 lib/logic_pio.c:305 (P)
 pci_resource_io+0x1f4/0x3dc drivers/pci/pci-sysfs.c:1187
 pci_write_resource+0x78/0x90 drivers/pci/pci-sysfs.c:1221
 sysfs_kf_bin_write+0x154/0x194 fs/sysfs/file.c:167
 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x51c/0xa0c fs/read_write.c:687
 ksys_pwrite64+0x118/0x1ac fs/read_write.c:794
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __arm64_sys_pwrite64+0xa8/0xc0 fs/read_write.c:799
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:738
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:757
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
Code: 929fffe8 d50332bf f2b81008 8b080288 (79000113) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	929fffe8 	mov	x8, #0xffffffffffff0000    	// #-65536
   4:	d50332bf 	dmb	oshst
   8:	f2b81008 	movk	x8, #0xc080, lsl #16
   c:	8b080288 	add	x8, x20, x8
* 10:	79000113 	strh	w19, [x8] <-- trapping instruction


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