BUG: unable to handle kernel paging request in xhci_halt

Status: upstream: reported C repro on 2026/08/21 07:52
Subsystems: usb
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+c90273bf9017ef1462af@syzkaller.appspotmail.com
First crash: 7d09h, last: 3d03h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
ec141a25 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ✅ BUG: unable to handle kernel paging request in xhci_halt 2026/08/18 00:05 2026/08/18 00:05 2026/08/18 00:08 1e72964b
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] usb: xhci: validate CAPLENGTH in xhci_gen_setup() 2 (2) 2026/08/22 10:33
[syzbot] [usb?] BUG: unable to handle kernel paging request in xhci_halt 0 (7) 2026/08/21 15:34
Last patch testing requests (6)
Created Duration User Patch Repo Result
2026/08/21 15:34 2h17m erdaitianjiao@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report job log log
2026/08/21 14:14 1h56m erdaitianjiao@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report job log log
2026/08/21 13:40 14m erdaitianjiao@gmail.com git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report job log log
2026/08/21 13:15 14m erdaitianjiao@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report job log log
2026/08/21 12:52 3m erdaitianjiao@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci error job log
2026/08/21 12:14 14m erdaitianjiao@gmail.com git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report job log log

Sample crash report:
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

Crashes (17):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/17 09:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 08:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 12:18 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 12:18 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 11:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 11:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 10:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 10:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 10:00 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 09:59 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 09:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 09:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 08:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 08:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 08:36 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 07:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
2026/08/17 07:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in xhci_halt
* Struck through repros no longer work on HEAD.