[Bug 219039] New: kernel 6.6.39 freezes with QNAP DL-D800C usb case

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219039

               URL: https://github.com/torvalds/linux/commit/66cb618bf0bb8
                    2859875b00eeffaf223557cb416
            Bug ID: 219039
           Summary: kernel 6.6.39 freezes with QNAP DL-D800C usb case
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.6.39
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: matthias@bodenbinder.de
        Regression: Yes
           Bisected 66cb618bf0bb82859875b00eeffaf223557cb416
         commit-id:

When I turn on my QNAP DL-D800C with 8 HD, the kernel 6.6.39 freezes
immediately. kernels 6.6.38 and 6.6.37 are not doing that. 

I can reproduce with arch kernel linux-lts 6.6.39-1 and with
linux66-tkg-eevdf-generic_v3 6.6.39-273.1

I identified commit 9a24eb8010c2dc6a2eba56e3eb9fc07d14ffe00a as the root cause:

commit 9a24eb8010c2dc6a2eba56e3eb9fc07d14ffe00a
Author: Niklas Neronin <niklas.neronin@linux.intel.com>
Date:   Mon Apr 29 17:02:37 2024 +0300

    usb: xhci: prevent potential failure in handle_tx_event() for Transfer
events without TRB

    [ Upstream commit 66cb618bf0bb82859875b00eeffaf223557cb416 ]

    Some transfer events don't always point to a TRB, and consequently don't
    have a endpoint ring. In these cases, function handle_tx_event() should
    not proceed, because if 'ep->skip' is set, the pointer to the endpoint
    ring is used.

    To prevent a potential failure and make the code logical, return after
    checking the completion code for a Transfer event without TRBs.

    Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
    Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
    Link:
https://lore.kernel.org/r/20240429140245.3955523-11-mathias.nyman@linux.intel.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>


When I revert that patch, the kernel does not freeze and everything is fine.

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