Re: [syzbot] [usb?] BUG: unable to handle kernel paging request in nhi_probe

[Aleksandr Nogikh]

#syz invalid

See the discussion at
https://lore.kernel.org/all/6a88012e.dbb3a75c.13dd47.0007.GAE@xxxxxxxxxx/T/

On Thu, Aug 6, 2026 at 2:01 AM syzbot
<syzbot+901ca72278dfd89daf58@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    7235a3e71949 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=11edb649580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ccf4bea59f67007
> dashboard link: https://syzkaller.appspot.com/bug?extid=901ca72278dfd89daf58
> 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=10678bb9580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1564acc6580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/fd45635beaae/disk-7235a3e7.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/d7d2e6507223/vmlinux-7235a3e7.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/b5b5d8de4cea/Image-7235a3e7.gz.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+901ca72278dfd89daf58@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> EXT4-fs (nvme0n1p2): shut down requested (2)
> Aborting journal on device nvme0n1p2-8.
> Unable to handle kernel paging request at
> Unable to handle kernel paging request at virtual address ffff800092aad640
> KASAN: probably user-memory-access in range [0x000000049556b200-0x000000049556b207]
> Mem abort info:
>   ESR = 0x0000000096000007
>   EC = 0x25: DABT (current EL), IL = 32 bits
>   SET = 0, FnV = 0
>   EA = 0, S1PTW = 0
>   FSC = 0x07: level 3 translation fault
> Data abort info:
>   ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000
>   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
>   GCS = 0, Overlay = 0, DirtyBit = 0
> swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000021b01f000
> [ffff800092aad640] pgd=0000000000000000, p4d=10000002212fc003, pud=10000002212fd003, pmd=1000000105275403, pte=0000000000000000
> Internal error: Oops: 0000000096000007 [#1]  SMP
> Modules linked in:
> CPU: 0 UID: 0 PID: 4950 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_readl arch/arm64/include/asm/io.h:84 [inline]
> pc : readl include/asm-generic/io.h:231 [inline]
> pc : ioread32 include/asm-generic/io.h:906 [inline]
> pc : nhi_probe+0xc0/0x730 drivers/thunderbolt/nhi.c:1198
> lr : nhi_probe+0x34/0x730 drivers/thunderbolt/nhi.c:1187
> sp : ffff8000982375b0
> x29: ffff8000982375c0 x28: 1fffe0001a3c399a x27: ffff0000d1e1ccd0
> x26: 1fffe0001a3c3998 x25: ffff0000c2f4a0d0 x24: 1fffe0001a3c3999
> x23: dfff800000000000 x22: 1fffe0001a3c39a7 x21: ffff0000d1e1cd38
> x20: ffff0000d1e1cc80 x19: ffff0000d1e1ccc8 x18: 1fffe00035bc9e28
> x17: 0000000000000003 x16: ffff800088b07000 x15: 0000000000000000
> x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000
> x11: ffff80008a590e28 x10: 0000000000000001 x9 : 0000000000000000
> x8 : ffff800092aad640 x7 : 0000000000000000 x6 : 0000000000000000
> x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000801571a8
> x2 : 0000000000000006 x1 : ffff0000c6899d40 x0 : 0000000000000000
> Call trace:
>  __raw_readl arch/arm64/include/asm/io.h:84 [inline] (P)
>  readl include/asm-generic/io.h:231 [inline] (P)
>  ioread32 include/asm-generic/io.h:906 [inline] (P)
>  nhi_probe+0xc0/0x730 drivers/thunderbolt/nhi.c:1198 (P)
>  nhi_pci_probe+0x418/0x4e4 drivers/thunderbolt/pci.c:479
>  local_pci_probe+0xc8/0x158 drivers/pci/pci-driver.c:332
>  pci_call_probe drivers/pci/pci-driver.c:394 [inline]
>  __pci_device_probe drivers/pci/pci-driver.c:455 [inline]
>  pci_device_probe+0x460/0x8d4 drivers/pci/pci-driver.c:489
>  call_driver_probe drivers/base/dd.c:-1 [inline]
>  really_probe+0x29c/0x800 drivers/base/dd.c:706
>  __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868
>  device_driver_attach+0x58/0xac drivers/base/dd.c:1203
>  bind_store+0xf4/0x14c drivers/base/bus.c:267
>  drv_attr_store+0x80/0xa4 drivers/base/bus.c:125
>  sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145
>  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_write+0x12c/0x228 fs/read_write.c:739
>  __do_sys_write fs/read_write.c:750 [inline]
>  __se_sys_write fs/read_write.c:747 [inline]
>  __arm64_sys_write+0x84/0x98 fs/read_write.c:747
>  __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:736
>  el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
>  el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
> Code: d343feb6 9140e508 91190108 d503201f (b9400109)
> ---[ end trace 0000000000000000 ]---
> ----------------
> Code disassembly (best guess):
>    0:   d343feb6        lsr     x22, x21, #3
>    4:   9140e508        add     x8, x8, #0x39, lsl #12
>    8:   91190108        add     x8, x8, #0x640
>    c:   d503201f        nop
> * 10:   b9400109        ldr     w9, [x8] <-- trapping instruction
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
>
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>
> If the report is already addressed, let syzbot know by replying with:
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>
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>
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