[Bug 215095] USB ehci error -110 and soft lockup on kernel 5.15.4 as kvm guest

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215095

--- Comment #5 from Alan Stern (stern@rowland.harvard.edu) ---
Here's something you can do to help diagnose the soft lockup.  When the lockup
occurs, go to the /sys/kernel/debug/usb/ehci/* directory (fill in the "*" with
the pathname for the EHCI controller that's locking up), make copies of the
files you find there, and attach those copies to this bug report.

Another thing you can do: Before the problem occurs, start a process doing

   cat /sys/kernel/debug/usb/usbmon/1u >mon.out

and after the lockup happens, kill the "cat" process.  Then attach the mon.out
file to the bug report.

There may be additional debugging options available in kvm, but I don't know
what they are.

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