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Date: Tue, 12 Jan 2021 19:04:45 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: "Rafael J. Wysocki" <rafael@...nel.org> Cc: Stephan Gerhold <stephan@...hold.net>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Peter Chen <Peter.Chen@....com>, Kishon Vijay Abraham I <kishon@...com>, "open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" <linux-usb@...r.kernel.org>, Thierry Reding <treding@...dia.com> Subject: Re: Infinite recursion in device_reorder_to_tail() due to circular device links On Tue, Jan 12, 2021 at 03:32:04PM +0100, Rafael J. Wysocki wrote: > On Mon, Jan 11, 2021 at 7:46 PM Stephan Gerhold <stephan@...hold.net> wrote: > > > > Hi, > > > > since 5.11-rc1 I get kernel crashes with infinite recursion in > > device_reorder_to_tail() in some situations... It's a bit complicated to > > explain so I want to apologize in advance for the long mail. :) > > > > Kernel panic - not syncing: kernel stack overflow > > CPU: 1 PID: 33 Comm: kworker/1:1 Not tainted 5.11.0-rc3 #1 > > Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) > > Call trace: > > ... > > device_reorder_to_tail+0x4c/0xf0 > > device_reorder_to_tail+0x98/0xf0 > > device_reorder_to_tail+0x60/0xf0 > > device_reorder_to_tail+0x60/0xf0 > > device_reorder_to_tail+0x60/0xf0 > > ... > > > > The crash happens only in 5.11 with commit 5b6164d3465f ("driver core: > > Reorder devices on successful probe"). It stops happening when I revert > > this commit. > > Thanks for the report! > > Greg, please revert commit 5b6164d3465f, it clearly is not an > improvement, at least at this point. Now reverted, thanks. greg k-h
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