From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f78.google.com (mail-oa1-f78.google.com [209.85.160.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0710B415B8E for ; Fri, 21 Aug 2026 07:52:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787298754; cv=none; b=MTP1mji4MidbKC6INmoit2RO0t0nnsT8adjEygjtzVrRv0qtNbBKV9ajAZeetpD1ECSToTCVT860GhE85yoEKXBJ5I9LJVv/M8uwtTZDvpTu+tQCc9Kgyie9d9rrHPe4wwKriBXKQD5Uo3fta/yAPZyMTOa4L4WzDbgUNoO7y0c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787298754; c=relaxed/simple; bh=kXZgYJuhp0K1lzjlbZl73RhSI7DUSmgEY9y7FtbPQQ4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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2002:a05:6820:3287:b0:6ac:a0db:1a78 with SMTP id 006d021491bc7-6b159270f05mr4407579eaf.5.1787298751955; Fri, 21 Aug 2026 00:52:31 -0700 (PDT) Date: Fri, 21 Aug 2026 00:52:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8803bf.dbb3a75c.13dd47.000a.GAE@google.com> Subject: [syzbot] [usb?] BUG: unable to handle kernel paging request in xhci_halt From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, mathias.nyman@intel.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 21d6ac051080 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=1366d949580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1128bc53f2ef7f3 dashboard link: https://syzkaller.appspot.com/bug?extid=c90273bf9017ef1462af 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=1741d6c6580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d03a79580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/88380e2ddcb9/disk-21d6ac05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5dba5c2896b7/vmlinux-21d6ac05.xz kernel image: https://storage.googleapis.com/syzbot-assets/52ac739e37e0/Image-21d6ac05.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c90273bf9017ef1462af@syzkaller.appspotmail.com EXT4-fs (nvme0n1p2): shut down requested (2) Aborting journal on device nvme0n1p2-8. xhci_hcd 0000:00:02.0: xHCI Host Controller xhci_hcd 0000:00:02.0: new USB bus registered, assigned bus number 34 Unable to handle kernel paging request at virtual address ffff8000936e40ff KASAN: probably user-memory-access in range [0x000000049b7207f8-0x000000049b7207ff] Mem abort info: ESR = 0x0000000096000021 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 = 0x00000021, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000021b049000 [ffff8000936e40ff] pgd=0000000000000000, p4d=1000000221341003, pud=1000000221342003, pmd=1000000106b4b403, pte=0068010000000713 Internal error: Oops: 0000000096000021 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 4935 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 63400005 (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 : xhci_quiesce drivers/usb/host/xhci.c:107 [inline] pc : xhci_halt+0x64/0x1ec drivers/usb/host/xhci.c:125 lr : xhci_halt+0x40/0x1ec drivers/usb/host/xhci.c:124 sp : ffff8000963773c0 x29: ffff8000963773c0 x28: ffff0000d23fa000 x27: dfff800000000000 x26: ffff0000d23fa418 x25: 0000000000000f01 x24: ffff0000d23fa6e8 x23: ffff0000c2f4a0d0 x22: ffff0000d23fa418 x21: dfff800000000000 x20: 1fffe0001a47f483 x19: ffff0000d23fa400 x18: 00000000ffffffff x17: ffff80008a7d6000 x16: 0000000000000005 x15: ffff80008a35fda0 x14: ffff80008a5d5e28 x13: 0000000000000004 x12: 0000000000000000 x11: ffff8000963772e0 x10: 00000000fffffbf2 x9 : 2afdbc7a43e86800 x8 : ffff8000936e40ff x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000833104ec x2 : 0000000000000002 x1 : ffff0000c4ec57c0 x0 : 0000000000000000 Call trace: __raw_readl arch/arm64/include/asm/io.h:84 [inline] (P) readl include/asm-generic/io.h:231 [inline] (P) xhci_quiesce drivers/usb/host/xhci.c:107 [inline] (P) xhci_halt+0x64/0x1ec drivers/usb/host/xhci.c:125 (P) xhci_gen_setup+0x5d8/0x111c drivers/usb/host/xhci.c:5496 xhci_pci_setup+0x110/0x44c drivers/usb/host/xhci-pci.c:579 usb_add_hcd+0x5c4/0xdec drivers/usb/core/hcd.c:2935 usb_hcd_pci_probe+0x63c/0xaa4 drivers/usb/core/hcd-pci.c:267 xhci_pci_common_probe+0x90/0x760 drivers/usb/host/xhci-pci.c:633 xhci_pci_probe+0x44/0xdc drivers/usb/host/xhci-pci.c:717 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:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Code: 9762248f f94002c8 128081aa d503201f (b9400108) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 9762248f bl 0xfffffffffd88923c 4: f94002c8 ldr x8, [x22] 8: 128081aa mov w10, #0xfffffbf2 // #-1038 c: d503201f nop * 10: b9400108 ldr w8, [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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup