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Date: Thu, 21 Jan 2010 18:24:37 +0200
From: Felipe Balbi <me@felipebalbi.com>
To: Sergey Lapin <slapinid@gmail.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>
Subject: Re: MUSB crash on OMAP3 board with second load of gadget
Message-ID: <20100121162437.GC3628@gandalf>
Reply-To: me@felipebalbi.com
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Hi,

On Thu, Jan 21, 2010 at 07:16:17PM +0300, Sergey Lapin wrote:
> On Thu, Jan 21, 2010 at 4:23 PM, Sergey Lapin <slapinid@gmail.com> wrote:
> > On Thu, Jan 21, 2010 at 3:28 PM, Felipe Balbi <felipe.balbi@nokia.com> wrote:
> >> On Thu, Jan 21, 2010 at 12:26:49PM +0100, ext Sergey Lapin wrote:
> >>>
> >>> Hi! I have crashes in MUSB code when working with USB gadget drivers.
> >>> Kernel version: linux-omap master d8ebff302ff819587377b123e900e501e4135d86
> >>> To reproduce: (USB device cable should be attached).
> >>>
> >>> dd if=/dev/zero of=/tmp/disk bs=1k count=1024
> >>> mkdosfs -F 32 /tmp/disk
> >>> insmod g_mass_storage ?file=/tmp/disk stall=0
> >>>
> >>> Wait till disk is mounted on host, then
> >>>
> >>> rmmod g_mass_storage
> >>> insmod g_mass_storage ?file=/tmp/disk stall=0
> >>>
> >>> And here we get Oops in include/linux/list.h line 93,
> >>
> >> I guess it's the list corruption bug, right ?
> >>
> >> I've seen that, but couldn't get it to reproduce. Now that you said, I'll
> >> try to find a fix for it.
> If you're interested, this is my Oops dump:
> 
> [12034.007812] Unable to handle kernel NULL pointer dereference at
> virtual address 00000001
> [12034.015960] pgd = c0004000
> [12034.018676] [00000001] *pgd=00000000
> [12034.022308] Internal error: Oops: 17 [#1] PREEMPT
> [12034.027038] last sysfs file:
> /sys/devices/platform/leds-gpio/leds/gnome5::red14/brightness
> [12034.035339] Modules linked in: g_mass_storage [last unloaded: g_mass_storage]
> [12034.042541] CPU: 0    Not tainted  (2.6.33-rc4-07149-ga29cd26-dirty #9)
> [12034.049224] PC is at list_del+0xc/0x90
> [12034.053009] LR is at musb_g_giveback+0x28/0x130
> [12034.057586] pc : [<c01b70d0>]    lr : [<c021d928>]    psr: 400001d3
> [12034.057586] sp : c03f7e48  ip : 00029fa5  fp : c7832048
> [12034.069122] r10: fa0ab000  r9 : fa0ab100  r8 : fa0ab100
> [12034.074371] r7 : 00000001  r6 : c7832064  r5 : 00000000  r4 : c6872718
> [12034.080963] r3 : 00000001  r2 : c03f7e4c  r1 : c03b02cb  r0 : c6872718
> [12034.087524] Flags: nZcv  IRQs off  FIQs off  Mode SVC_32  ISA ARM
> Segment kernel
> [12034.095031] Control: 10c5387d  Table: 87024019  DAC: 00000017
> [12034.100830] Process swapper (pid: 0, stack limit = 0xc03f62e8)
> [12034.106689] Stack: (0xc03f7e48 to 0xc03f8000)
> [12034.111083] 7e40:                   c6872718 c03b02cb c6872700
> c021d928 c03f7e96 c021b650
> [12034.119323] 7e60: c7832048 00000008 c03f7e96 00000000 00000008
> c7832000 00000001 c021c230
> [12034.127563] 7e80: 00000000 00000000 c0407a40 c0407538 0f2c8be7
> 0680c278 00000100 00000040
> [12034.135803] 7ea0: 0fd51da8 00000000 000000f0 c7832000 00000008
> 00000099 00000000 00000000
> [12034.144042] 7ec0: 00000000 c021b388 c7832000 00000008 fa0ab000
> 00000000 c7832000 60000153
> [12034.152252] 7ee0: 0000005c c03f6000 0000005c c021b4c0 c78b9d00
> c78b9d00 0000005c c0090b80
> [12034.160491] 7f00: c78b9d00 c04099cc 0000005c 00000002 00000001
> c03f6000 0000001f c0092c44
> [12034.168731] 7f20: 0000005c 00000000 00000003 c0030070 ffffffff
> fa200000 00000003 c0030ac4
> [12034.176971] 7f40: 001e449b 00000000 001e449b 00000000 c04316c0
> 00000003 00000003 c04316c0
> [12034.185211] 7f60: 80027478 411fc082 0000001f 00000000 00000000
> c03f7f88 c00420d0 c00420dc
> [12034.193450] 7f80: 60000053 ffffffff 00000000 001e449b 386d8e77
> 0fb39696 386d8e77 0f9551fb
> [12034.201660] 7fa0: c03fbd50 c03fbe20 c0430cdc c03fbd50 c0476b48
> c022d7ac c03f6000 c0430cdc
> [12034.209899] 7fc0: c0029014 c03f9c10 80027478 c00324dc c045c9c0
> c0008934 c000848c 00000000
> [12034.218139] 7fe0: 00000000 c0029018 00000000 10c53c7d c0430df0
> 80008034 00000000 00000000
> [12034.226379] [<c01b70d0>] (list_del+0xc/0x90) from [<c021d928>]
> (musb_g_giveback+0x28/0x130)
> [12034.234802] [<c021d928>] (musb_g_giveback+0x28/0x130) from
> [<c021c230>] (musb_g_ep0_irq+0x32c/0x910)
> [12034.244018] [<c021c230>] (musb_g_ep0_irq+0x32c/0x910) from
> [<c021b388>] (musb_interrupt+0x2fc/0x3d4)
> [12034.253204] [<c021b388>] (musb_interrupt+0x2fc/0x3d4) from
> [<c021b4c0>] (generic_interrupt+0x60/0x94)
> [12034.262512] [<c021b4c0>] (generic_interrupt+0x60/0x94) from
> [<c0090b80>] (handle_IRQ_event+0xa4/0x1e0)
> [12034.271881] [<c0090b80>] (handle_IRQ_event+0xa4/0x1e0) from
> [<c0092c44>] (handle_level_irq+0xc0/0x150)
> [12034.281250] [<c0092c44>] (handle_level_irq+0xc0/0x150) from
> [<c0030070>] (asm_do_IRQ+0x70/0x90)
> [12034.290008] [<c0030070>] (asm_do_IRQ+0x70/0x90) from [<c0030ac4>]
> (__irq_svc+0x44/0xa8)
> [12034.298065] Exception stack(0xc03f7f40 to 0xc03f7f88)
> [12034.303161] 7f40: 001e449b 00000000 001e449b 00000000 c04316c0
> 00000003 00000003 c04316c0
> [12034.311401] 7f60: 80027478 411fc082 0000001f 00000000 00000000
> c03f7f88 c00420d0 c00420dc
> [12034.319641] 7f80: 60000053 ffffffff
> [12034.323150] [<c0030ac4>] (__irq_svc+0x44/0xa8) from [<c00420dc>]
> (omap3_enter_idle+0x124/0x158)
> [12034.331939] [<c00420dc>] (omap3_enter_idle+0x124/0x158) from
> [<c022d7ac>] (cpuidle_idle_call+0xa4/0x180)
> [12034.341491] [<c022d7ac>] (cpuidle_idle_call+0xa4/0x180) from
> [<c00324dc>] (cpu_idle+0x48/0x98)
> [12034.350189] [<c00324dc>] (cpu_idle+0x48/0x98) from [<c0008934>]
> (start_kernel+0x268/0x2c8)
> [12034.358489] [<c0008934>] (start_kernel+0x268/0x2c8) from
> [<80008034>] (0x80008034)
> [12034.366119] Code: c03a882b e92d4013 e5903004 e1a04000 (e593c000)
> [12034.372406] ---[ end trace e93a9fc16bcba40b ]---
> [12034.377075] Kernel panic - not syncing: Fatal exception in interrupt

this is different from what I've seen. So it's a different problem. Can
you get some debugging messages out of that ?

enable debugging messages for musb on Kconfig and:

echo 5 > /sys/modules/musb_hdrc/parameters/debug

then:

echo 8 > /proc/sysrq-trigger

then reproduce the problem and get the messages that come before the
oops.

-- 
balbi
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