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AHgh+RpmD7KDK6Rqr4GQ2cDljNeyc8FLNdqgzwd7+3Cf8nKuCwWzNgRLnVGPVvRuKBNZNwGgubxbScCfZizTvg4=@vger.kernel.org X-Gm-Message-State: AOJu0YzrmrgA4CtGBb5JbZe8wURPuMeq6OfvWqEE7GJ3oa+rug8RnVWK 2ovziytuILCUwJMtIAdR/yD7X/SwV59aB8ZiIl0vQFVSJG0y/c4MQeds1T/pX569XQB5p6uje2w goInmViaAEUi+WBiZPW1v6ubaDIymqBtPoUHHqwosb0Q+N5JQ5cODmQi8JYA= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:6f8e:b0:4b2:8ee8:8a38 with SMTP id 5614622812f47-4b2eef37debmr6449618b6e.0.1787317023294; Fri, 21 Aug 2026 05:57:03 -0700 (PDT) Date: Fri, 21 Aug 2026 05:57:03 -0700 In-Reply-To: <20260821201437.016149@erdaitian.localdomain> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a884b1f.dbb3a75c.13dd47.001a.GAE@google.com> Subject: Re: [syzbot] [usb?] BUG: unable to handle kernel paging request in xhci_halt From: syzbot To: erdaitianjiao@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: unable to handle kernel paging request in xhci_halt 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 ffff800093f3c0ff KASAN: probably user-memory-access in range [0x000000049f9e07f8-0x000000049f9e07ff] 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 [ffff800093f3c0ff] pgd=0000000000000000, p4d=1000000221341003, pud=1000000221342003, pmd=1000000108016403, pte=0068010000000713 Internal error: Oops: 0000000096000021 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 5341 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 : ffff8000962f73c0 x29: ffff8000962f73c0 x28: ffff0000d6df6000 x27: dfff800000000000 x26: ffff0000d6df6418 x25: 0000000000000f01 x24: ffff0000d6df66e8 x23: ffff0000c2b100d0 x22: ffff0000d6df6418 x21: dfff800000000000 x20: 1fffe0001adbec83 x19: ffff0000d6df6400 x18: 00000000ffffffff x17: ffff80008a7d6000 x16: 0000000000000006 x15: ffff80008a35fda0 x14: ffff80008a5d5e28 x13: 0000000000000004 x12: 0000000000000000 x11: ffff8000962f72e0 x10: 00000000fffffbf2 x9 : 7e63f6aa279c3000 x8 : ffff800093f3c0ff x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000833104ec x2 : 0000000000000002 x1 : ffff0000c8e13a80 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 Tested on: commit: 21d6ac05 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=10fe9e79580000 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 Note: no patches were applied.