[Bug 220491] usb_storage connected SD card disconnects/reconnects on resume from suspend

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https://bugzilla.kernel.org/show_bug.cgi?id=220491

--- Comment #53 from Paul Ausbeck (paula@alumni.cse.ucsc.edu) ---
Created attachment 308646
  --> https://bugzilla.kernel.org/attachment.cgi?id=308646&action=edit
kdb triggered disconnect, dmesg tail

I have correlated disconnection of the USB connected SD card with stalling the
kernel with kdb. Thus far, a long kdb stall, perhaps as long as overnight, is
necessary for the SD card to disconnect upon resuming kernel operation.
Interestingly, the disconnection is not immediate, minutes elapse between
kernel resumption and device disconnection. Also interesting is that once the
device starts disconnecting, it will disconnect several times, maybe
indefinitely, with several minutes elapsed time between each hit of the
usb_disconnect breakpoint. When the usb_disconnect breakpoint it hit, backtrace
shows hub_event as the calling routine.

The attached file is a dmesg fragment starting upon kernel resumption via the
kdb "go" command. The previous attachment is a usbmon trace of the same
activity period.

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