Date: Tue, 30 Nov 2021 14:16:37 +0000 From: Andrew Turner <andrew@fubar.geek.nz> To: Hans Petter Selasky <hps@selasky.org> Cc: freebsd-arm@freebsd.org Subject: Re: 14-CURRENT Kernel Panic due to USB hub? Message-ID: <C3FE68C0-44DB-493F-9C29-C73859840C9B@fubar.geek.nz> In-Reply-To: <45534c79-311b-d1df-c412-5bd782678cfb@selasky.org> References: <fbfa2dcc-ae3f-230b-2f56-3b940b025342@morante.net> <2b555ef9-12fe-6214-79a0-cebce1933771@selasky.org> <5bfb1865-8033-0da6-27e4-3c25fb067cee@morante.net> <6F2AD5E1-5AB1-4D08-97F4-84E2905D592B@fubar.geek.nz> <B1DFC16D-47F6-4803-BF12-406EC96465B9@fubar.geek.nz> <45534c79-311b-d1df-c412-5bd782678cfb@selasky.org>
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> On 30 Nov 2021, at 12:35, Hans Petter Selasky <hps@selasky.org> wrote: >=20 > 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=E2=80=99s just making it less = likely to be triggered. >> Andrew >> [1] https://cgit.freebsd.org/src/commit/?id=3D601ee53858f6 >=20 > Hi, >=20 > Could you verify that you are not running out of kernel stack? I can still trigger it after doubling the kernel stack size. >=20 > 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=E2=80=99s memory corruption. >=20 > 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. 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.=20= Andrew=
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