[DragonFlyBSD - Bug #2244] usb - system hangs during boot when USB mas

Issue #2244 has been updated by Alan K.


I tested with dfly-x86_64-2.12.0_RC.img. It doesn't have the problem. 

This led me to test different stages of the master branch.

The problem appears to first start with commit 7e370202e053de3ef8357ef02e8b6f1e97694f97

The problem does not occur before that commit (i.e. with 95874ffdec65823430464b7869d8f0acf75cc226 or older).

##########

http://gitweb.dragonflybsd.org/dragonfly.git/commit/7e370202e053de3ef8357ef02e8b6f1e97694f97

x86_64/nexus: Per-cpu IRQ rman

 Now interrupt thread will be pin to the same CPU as where its GSI
 will go.sys/platform/pc64/x86_64/nexus.c
----------------------------------------
Bug #2244: usb - system hangs during boot when USB mass storage device/stick is connected - 2.13.0.357.gcdb8af
http://bugs.dragonflybsd.org/issues/2244

Author: Alan K
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


Versions:

Workstation: Lenovo Thinkcentre M58p 
DragonFlyBSD: v2.13.0.357.gcdb8af-DEVELOPMENT X86_64_GENERIC x86_64

################

Problem Description:

My system hangs during boot if a USB mass storage device/stick is connected.
By hang I mean no more output is shown and I cannot turn off/on num lock key on keyboard.
A hard reset is needed at this stage.

This prevents me from installing DragonFlyBSD from a USB stick.

I first noticed the problem when trying to boot via USB using the 2011 Nov 17th "DragonFly-x86_64-LATEST-IMG.img".
I haven't tried older versions.

I can connect and use the USB mass storage device/stick after boot without problem, and shutdown while attached without problem.

################

I recompiled kernel with "options USB_DEBUG" and booted with verbose logging option.
The last lines shown are:

uhci1: <UHCI (generic) USB controller> [tentative] port 0x1860-0x187f irq 17 at device 26.1 on pci0
uhci1: Reserved 0x20 bytes for rid 0x20 type 4 at 0x1860
uhci1: LegSup = 0x0010

################

From pciconf -lv:

uhci0@pci0:0:26:0:      class=0x0c0300 card=0x304817aa chip=0x3a678086 rev=0x02 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'USB UHCI Controller'
    class      = serial bus
    subclass   = USB
uhci1@pci0:0:26:1:      class=0x0c0300 card=0x304817aa chip=0x3a688086 rev=0x02 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'USB UHCI Controller'
    class      = serial bus
    subclass   = USB

################

I put kprintf's in various kernel source files to find where it hangs. 
(Please note that I do not know anything about the kernel and very little about C).
This is what I found:

Function "uhci_pci_attach(device_t self)" is called from /usr/src/sys/bus/usb/uhci_pci.c

uhci_pci_attach() calls "err = uhci_init(sc);" which is in /usr/src/sys/bus/usb/uhci.c

uhci_init() calls "uhci_globalreset(sc);" which is in /usr/src/sys/bus/usb/uhci.c

uhci_globalreset() calls "usb_delay_ms(&sc->sc_bus, USB_BUS_RESET_DELAY);" which is in /usr/src/sys/bus/usb/usb_subr.c

usb_delay_ms calls "delay((ms+1) * 1000);" with value 101000 (ms is 100).

....
....

It appears that "delay((ms+1) * 1000);" never returns. I think this because I have a kprintf() after the delay().

delay() is defined as DELAY in /usr/src/sys/bus/usb/usb_subr.c.
DELAY is defined in sys/systm.h but I cannot find the source file containing the DELAY function.

################

/usr/src/sys/bus/usb/usb_subr.c with the extra kprintfs:

/* Delay for a certain number of ms */
void
usb_delay_ms(usbd_bus_handle bus, u_int ms)
{
        kprintf("AK: at start of function usb_delay_ms\n");

        /* Wait at least two clock ticks so we know the time has passed. */
        if (bus->use_polling || cold) {
                kprintf("AK: usb_delay_ms: in if cold and calling delay.\nAK: Value of ms after math: %d\n", (ms+1)*1000);
                delay((ms+1) * 1000);
                kprintf("AK: usb_delay_ms: finished delay\n");
        }
        else {
                kprintf("AK: usb_delay_ms: in else about about to do tsleep\n");
                tsleep(&ms, 0, "usbdly", (ms*hz+999)/1000 + 1);
        }

        kprintf("AK: at end of usb_delay_ms\n");
}

################

Attached dmesg and messages files taken after verbose boot without the usb stick attached.



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