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Date: Fri, 22 Jan 2010 13:38:19 +0300
Message-ID: <48239d391001220238r151c4dfbjd8f6e7863718dad8@mail.gmail.com>
Subject: Re: MUSB crash on OMAP3 board with second load of gadget
From: Sergey Lapin <slapinid@gmail.com>
To: me@felipebalbi.com
Cc: felipe.balbi@nokia.com,
       "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
       "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       David Brownell <dbrownell@users.sourceforge.net>
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Hi,

> [ ?580.082427] [<c0030ac4>] (__irq_svc+0x44/0xa8) from [<c00420dc>]
> (omap3_enter_idle+0x124/0x158)
> [ ?580.091186] [<c00420dc>] (omap3_enter_idle+0x124/0x158) from
> [<c022d708>] (cpuidle_idle_call+0xa4/0x180)
> [ ?580.100738] [<c022d708>] (cpuidle_idle_call+0xa4/0x180) from
> [<c00324dc>] (cpu_idle+0x48/0x98)
> [ ?580.109436] [<c00324dc>] (cpu_idle+0x48/0x98) from [<c0008934>]
> (start_kernel+0x268/0x2c8)
> [ ?580.117767] [<c0008934>] (start_kernel+0x268/0x2c8) from
> [<80008034>] (0x80008034)
> [ ?580.125366] Code: c03a876b e92d4013 e5903004 e1a04000 (e593c000)
> [ ?580.131652] ---[ end trace 42b8f4f7e396999c ]---
> [ ?580.136291] Kernel panic - not syncing: Fatal exception in interrupt
>

I've managed to debug that in my case,
drivers/usb/musb/musb_gadget_ep0.c:
musb_read_setup():
        /* clean up any leftover transfers */
        r = next_ep0_request(musb);
in this place we have somewhat corrupted usb_request. Any ideas why?

By the way, crash is not reproduced if cable is removed before module unloading
(and all USB activity processed).

S.
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