[syzbot] [kernel?] WARNING in __ioremap_caller

[syzbot <syzbot+49b1021becba70c1f3f6@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    2961f841b025 Merge tag 'turbostat-2026.02.14' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17674594580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6259cfbe2d15cac4
dashboard link: https://syzkaller.appspot.com/bug?extid=49b1021becba70c1f3f6
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4db266f4e980/disk-2961f841.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9ec134f45048/vmlinux-2961f841.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5ba4f405d712/bzImage-2961f841.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+49b1021becba70c1f3f6@syzkaller.appspotmail.com

ioremap: invalid physical address a729678abbd17117
------------[ cut here ]------------
1
WARNING: arch/x86/mm/ioremap.c:206 at __ioremap_caller.isra.0.cold+0x59/0xa4 arch/x86/mm/ioremap.c:206, CPU#0: syz.1.4191/26162
Modules linked in:
CPU: 0 UID: 0 PID: 26162 Comm: syz.1.4191 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__ioremap_caller.isra.0.cold+0x59/0xa4 arch/x86/mm/ioremap.c:206
Code: 48 8b 34 24 48 c7 c7 e0 fc ab 8b e8 30 1d 01 00 e9 61 c2 97 00 e8 76 ca e6 00 4c 89 ee 48 c7 c7 40 fb ab 8b e8 17 1d 01 00 90 <0f> 0b 90 e9 41 c2 97 00 e8 59 ca e6 00 41 0f b6 d7 4c 89 ee 48 c7
RSP: 0018:ffffc90004d1f718 EFLAGS: 00010286
RAX: 0000000000000032 RBX: 1ffff920009a3ee7 RCX: 0000000000000000
RDX: 0000000000000032 RSI: ffffffff81e6f929 RDI: fffff520009a3ed4
RBP: 0000000000000040 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000038c68 R12: a729678abbd17156
R13: a729678abbd17117 R14: 0000000000000000 R15: 0000000000029ca5
FS:  00007fc5be1016c0(0000) GS:ffff888124351000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32306ff8 CR3: 00000000831e0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ioremap_cache arch/x86/mm/ioremap.c:436 [inline]
 arch_memremap_wb+0x23/0x40 arch/x86/mm/ioremap.c:508
 memremap+0x1cb/0x7d0 kernel/iomem.c:95
 pcibios_device_add+0x101/0x600 arch/x86/pci/common.c:652
 pci_device_add+0xd4f/0x1810 drivers/pci/probe.c:2761
 pci_scan_single_device drivers/pci/probe.c:2793 [inline]
 pci_scan_single_device+0x1d0/0x240 drivers/pci/probe.c:2779
 pci_scan_slot+0x1c9/0x7c0 drivers/pci/probe.c:2876
 pci_scan_child_bus_extend+0x6b/0x7b0 drivers/pci/probe.c:3095
 pci_scan_child_bus drivers/pci/probe.c:3208 [inline]
 pci_rescan_bus+0x18/0x40 drivers/pci/probe.c:3499
 rescan_store+0xfb/0x130 drivers/pci/pci-sysfs.c:472
 bus_attr_store+0x74/0xb0 drivers/base/bus.c:172
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_write+0x12a/0x250 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5bd19c629
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:00007fc5be101028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc5bd415fa0 RCX: 00007fc5bd19c629
RDX: 0000000000000001 RSI: 0000200000000200 RDI: 0000000000000003
RBP: 00007fc5bd232b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5bd416038 R14: 00007fc5bd415fa0 R15: 00007ffc328057a8
 </TASK>


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