Re: 14-CURRENT Kernel Panic due to USB hub?
- In reply to: Hans Petter Selasky : "Re: 14-CURRENT Kernel Panic due to USB hub?"
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Date: Tue, 30 Nov 2021 22:50:19 UTC
On 2021-Nov-30, at 13:37, Hans Petter Selasky <hps@selasky.org> wrote: > On 11/30/21 18:21, Andrew Turner wrote: >>> On 30 Nov 2021, at 14:34, Hans Petter Selasky <hps@selasky.org> wrote: >>> >>> On 11/30/21 15:16, Andrew Turner wrote: >>>>> On 30 Nov 2021, at 12:35, Hans Petter Selasky <hps@selasky.org> wrote: >>>>> >>>>> On 11/30/21 13:22, Andrew Turner wrote: >>>>>> I bisected the detached messages back to 601ee53858f6 [1]. If I revert this change I no longer see this on the console. >>>>>> I am also unable to reproduce the panic with this change reverted. As the panic can be difficult to reproduce I am unsure if reverting this change is enough to fix it, or if it’s just making it less likely to be triggered. >>>>>> Andrew >>>>>> [1] https://cgit.freebsd.org/src/commit/?id=601ee53858f6 >>>>> >>>>> Hi, >>>>> >>>>> Could you verify that you are not running out of kernel stack? >>>> I can still trigger it after doubling the kernel stack size. >>>>> >>>>> May this be due to some code in the .text segment which is not properly aligned? >>>> I would expect to have seen the issue on other HW. The issue looks more like it’s memory corruption. >>>>> >>>>> If you compile and load USB as modules, does the panic go away? >>>> I am unable to trigger it after removing xhci from the kernel, and did get a panic after loading the xhci module. Note the above line of text. >>>> The xhci controller is one that originated in Broadcom. Linux has a quirk for it to work around an erratum where attaching a USB 1 device followed by a USB 2 device the linker the latter will come up as USB 1. They reset the phy when anything less than USB 3 on a disconnect event. >>> >>> And there is no BIOS / UEFI code still running on that XHCI controller? >> I would expect the UEFI code to not be accessing the XHCI controller after exiting the loader. >> Andrew > > Hi, > > Could you try to kldload xhci instead of building it into the kernel config? Maybe you get a different kind of panic that way. Looks like that was already done and reported on. May be you want more detail about how kldload failure went? > --HPS > === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)