Re: [PATCH v3 05/12] usb: otg-fsm: Fix hrtimer list corruption
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-07-06 01:15:45
Also in:
linux-devicetree, linux-tegra, linux-usb, lkml
06.07.2021 03:57, Peter Chen пишет:
On 21-07-05 01:54:26, Dmitry Osipenko wrote:quoted
The HNP work can be re-scheduled while it's still in-fly. This results in re-initialization of the busy work, resetting the hrtimer's list node of the work and crashing kernel with null dereference within kernel/timer once work's timer is expired. It's very easy to trigger this problem by re-plugging USB cable quickly. Initialize HNP work only once to fix this trouble. Cc: stable@vger.kernel.org Signed-off-by: Dmitry Osipenko <digetx@gmail.com>Acked-by: Peter Chen <peter.chen@kernel.org> It is better to append kernel dump if you have v4 patchset.
The stacktrace isn't very useful because it crashes within a hrtimer code from a work thread, i.e. it doesn't point at usb at all. It actually took me some effort to find where the bug was.