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Re: Recent usb changes cause panic when umass removed

On Sat, 28 May 2011, Paul Goyette wrote:

I've updated a couple of my machines to -current built from sources of 14:05:30 UTC. Part of my update sequence is to attach an external USB hard drive and dump the root file system.

On both machines, I get a kernel panic upon removing the external USB hard drive. The first machine I didn't catch (still had xdm running), but on the second machine I got the following backtrace:

        ehci_free + 0x17
        usbd_free_xfer + 0x2a
        umass_disco + 0x56
        umass_detach + 0xe5
        config_detach + 0x90
        usb_disconnect_port + 0xa3
        uhub_explore + 0x16f
        usb_discover + 0x31
        usb_event_thread + 0x3e

Confirmed fixed by:

Module Name:    src
Committed By:   tsutsui
Date:           Sat May 28 15:47:17 UTC 2011

Modified Files:
        src/sys/dev/usb: ehci.c ohci.c ohcivar.h uhci.c

Log Message:
Revert changes for PR kern/44907
for now.  It might cause a panic in ehci_freex() on device detach
as reported by Paul Goyette on current-users@.

Thanks for quick action!

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