Message-ID: <AANLkTim0+GbddLdkPFoggeCKpU7on7mta0V2mZZLgviE@mail.gmail.com>
Date:	Wed, 29 Dec 2010 19:45:34 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Baruch Siach <baruch@...s.co.il>
Cc:	Angelo Dureghello <angelo70@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-m68k@...r.kernel.org,
	uClinux development list <uclinux-dev@...inux.org>
Subject: Re: dm9000 patch

On Wed, Dec 29, 2010 at 19:06, Baruch Siach <baruch@...s.co.il> wrote:
> Hi Angelo,
>
> On Wed, Dec 29, 2010 at 02:13:22PM +0100, Angelo Dureghello wrote:
>> just FYI, i tested kernel 2.6.36.2, unfortunately the issue is still
>> there, below the call stack trace.
>
> Help from the m68k experts seems to be needed. Adding the relevant list to Cc.

This is uClinux? Added Cc...

>> [    4.620000] eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
>> [   39.390000] BUG: spinlock recursion on CPU#0, httpd/29
>> [   39.390000]  lock: 00189c44, .magic: dead4ead, .owner: httpd/29,
>> .owner_cpu: 0
>> [   39.390000] Stack from 00d6a990:
>> [   39.390000]         00d6a9bc 000a9710 0017cac7 00189c44 dead4ead
>> 00de48f4 0000001d 00000000
>> [   39.390000]         00189c44 0002a646 00145f70 00d6a9f0 000a98e2
>> 00189c44 0017cb2d 00189c44
>> [   39.390000]         00d6aad8 0000001f 00145f5c 001523f6 00189c08
>> 0002a646 00145f70 0002bc52
>> [   39.390000]         00d6a9fc 00145f7e 00189c44 00d6aa28 0002a75e
>> 00189c44 0000001f 00d6aad8
>> [   39.390000]         0000001f 00145f5c 00189c08 0002a646 00145f70
>> 0002bc52 00d6aa3c 00000bb6
>> [   39.390000]         0000001f 00189c44 00cfc780 00d6aa84 0000337a
>> 0000001f 00d6aa4c 00000001
>> [   39.390000] Call Trace:
>> [   39.390000]  [000a9710] spin_bug+0x86/0x11a
>> [   39.390000]  [000a98e2] do_raw_spin_lock+0x58/0x120
>> [   39.390000]  [00145f7e] _raw_spin_lock+0xe/0x14
>> [   39.390000]  [0002a75e] __do_IRQ+0x2c/0x108
>> [   39.390000]  [00000bb6] do_IRQ+0x48/0x62
>> [   39.390000]  [0000337a] inthandler+0x6a/0x74
>> [   39.390000]  [0002a82e] __do_IRQ+0xfc/0x108
>> [   39.390000]  [00000bb6] do_IRQ+0x48/0x62
>> [   39.390000]  [0000337a] inthandler+0x6a/0x74
>> [   39.390000]  [000ef0ce] skb_release_all+0x10/0x20
>> [   39.390000]  [000ee6bc] __kfree_skb+0x10/0x92
>> [   39.390000]  [000ee75e] consume_skb+0x20/0x34
>> [   39.390000]  [000e004e] dm9000_start_xmit+0xdc/0xec
>> [   39.390000]  [000f67a2] dev_hard_start_xmit+0x146/0x472
>> [   39.390000]  [00106506] sch_direct_xmit+0xc0/0x1bc
>> [   39.390000]  [000f9914] dev_queue_xmit+0x160/0x3e4
>> [   39.390000]  [00113b3e] ip_finish_output+0xee/0x318
>> [   39.390000]  [001142b4] ip_output+0x7c/0x88
>> [   39.390000]  [00113dc6] ip_local_out+0x26/0x30
>> [   39.390000]  [00114d9a] ip_queue_xmit+0x152/0x374
>> [   39.390000]  [00125c8c] tcp_transmit_skb+0x3f0/0x732
>> [   39.390000]  [00126f26] tcp_write_xmit+0x178/0x868
>> [   39.390000]  [00127644] __tcp_push_pending_frames+0x2e/0x9a
>> [   39.390000]  [0011c3d6] tcp_sendmsg+0x82e/0x98c
>> [   39.390000]  [00137544] inet_sendmsg+0x32/0x54
>> [   39.390000]  [000e79a6] sock_aio_write+0xc8/0x138
>> [   39.390000]  [00042590] do_sync_write+0x9e/0xfe
>> [   39.390000]  [00042668] vfs_write+0x78/0x84
>> [   39.390000]  [00042a92] sys_write+0x40/0x7a
>> [   39.390000]  [00003224] system_call+0x84/0xc2
>> [   39.390000]
>>
>> dm9000e is as default not visible/selectable in menuconfig for
>> Coldfire architectures, so this probably cannot be considered as a
>> kernel bug.
>>
>> I going forward in investigations, every help is appreciated,
>>
>> regards,
>> angelo
>>
>>
>>
>> On 29/12/2010 07:06, Baruch Siach wrote:
>> >Hi Angelo,
>> >
>> >On Tue, Dec 28, 2010 at 10:52:42PM +0100, Angelo Dureghello wrote:
>> >>sorry to contact you directly but i couldn't get any help from the
>> >>kernel.org mailing list, since i am not a developer my mails are
>> >>generally skipped.
>> >The best way to get the contact info for a piece of kernel code, is using the
>> >get_maintainer.pl script. Running 'scripts/get_maintainer.pl -f
>> >drivers/net/dm9000.c' gives the following output:
>> >
>> >netdev@...r.kernel.org
>> >linux-kernel@...r.kernel.org
>> >
>> >I added both to Cc.
>> >
>> >>I am very near to have a custom board working with MCF5307 cpu and dm9000.
>> >>I am using kernel 2.6.36-rc3 with your last patch about
>> >>spinlock-recursion already included.
>> >You should try to update to the latest .36 kernel, which is currently
>> >2.6.36.2. The problem that you experience might be unrelated to the dm9000
>> >driver (or to networking at all), so it might have been fixed in this version.
>> >
>> >>I have "ping" and "telnet" to the embedded board fully working.
>> >>If i try to get a sample web page with some images from the board
>> >>httpd with a browser, in 80% of cases i get a trap/oops:
>> >Try to enable KALLSYMS in your kernel .config to make your stack trace more
>> >meaningful. This is under 'General setup ->  Configure standard kernel features
>> >(for small systems) ->  Load all symbols for debugging/ksymoops'.
>> >
>> >I hope this helps.
>> >
>> >baruch
>> >
>> >>[    4.590000] eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
>> >>[   67.630000] BUG: spinlock recursion on CPU#0, httpd/29
>> >>[   67.630000]  lock: 00c42c06, .magic: dead4ead, .owner: httpd/29,
>> >>.owner_cpu: 0
>> >>[   67.630000] Stack from 00d7b914:
>> >>[   67.630000]         00d7b940 000a8cf0 0015f693 00c42c06 dead4ead
>> >>00dec1d4 0000001d 00000000
>> >>[   67.630000]         00c42c06 00006188 00c42800 00d7b974 000a8ec2
>> >>00c42c06 0015f6f9 00002704
>> >>[   67.630000]         00000000 0000001f 00146fa4 00152f0c 00c42b60
>> >>00006188 00c42800 0002b312
>> >>[   67.630000]         00d7b984 0014701e 00c42c06 00000000 00d7b9c4
>> >>000df21c 00c42c06 00000000
>> >>[   67.630000]         00000000 0000001f 00146fa4 00152f0c 000005ea
>> >>00cfc640 00006188 000096e8
>> >>[   67.630000]         0002b312 00146fa4 00c42b60 00002704 00d7b9ec
>> >>00029d3a 0000001f 00c42800
>> >>[   67.630000] Call Trace:
>> >>[   67.630000]  [000a8cf0]  [000a8ec2]  [0014701e]  [000df21c]  [00029d3a]
>> >>[   67.630000]  [00029e84]  [00000bb6]  [0000336e]  [000df162]  [000effd6]
>> >>[   67.630000]  [00100482]  [000f312e]  [000f9ebc]  [0010dd2a]  [0010e4a0]
>> >>[   67.630000]  [0010dfb2]  [0010ef80]  [0011fed6]  [00121170]  [0012188e]
>> >>[   67.630000]  [0011ecc6]  [001249fe]  [000e4084]  [0011621c]  [00131a44]
>> >>[   67.630000]  [000e11ee]  [00041944]  [00041a1c]  [00041e46]  [00003218]
>> >>[   67.630000] BUG: spinlock lockup on CPU#0, httpd/29, 00c42c06
>> >>[   67.630000] Stack from 00d7b934:
>> >>[   67.630000]         00d7b974 000a8f66 0015f703 00000000 00dec1d4
>> >>0000001d 00c42c06 00002704
>> >>[   67.630000]         00000000 0000001f 00146fa4 00152f0c 00c42b60
>> >>00006188 00c42800 0002b312
>> >>[   67.630000]         00d7b984 0014701e 00c42c06 00000000 00d7b9c4
>> >>000df21c 00c42c06 00000000
>> >>[   67.630000]         00000000 0000001f 00146fa4 00152f0c 000005ea
>> >>00cfc640 00006188 000096e8
>> >>[   67.630000]         0002b312 00146fa4 00c42b60 00002704 00d7b9ec
>> >>00029d3a 0000001f 00c42800
>> >>[   67.630000]         0016c1b4 00cfc640 0000001f 0016c178 00029d10
>> >>00146fb8 00d7ba20 00029e84
>> >>[   67.630000] Call Trace:
>> >>[   67.630000]  [000a8f66]  [0014701e]  [000df21c]  [00029d3a]  [00029e84]
>> >>[   67.630000]  [00000bb6]  [0000336e]  [000df162]  [000effd6]  [00100482]
>> >>[   67.630000]  [000f312e]  [000f9ebc]  [0010dd2a]  [0010e4a0]  [0010dfb2]
>> >>[   67.630000]  [0010ef80]  [0011fed6]  [00121170]  [0012188e]  [0011ecc6]
>> >>[   67.630000]  [001249fe]  [000e4084]  [0011621c]  [00131a44]  [000e11ee]
>> >>[   67.630000]  [00041944]  [00041a1c]  [00041e46]  [00003218]
>> >>
>> >>As i said, i was hoping in your patch but i sadly discovered it is
>> >>already included in this kernel version.
>> >>Hope you can give me some help or can forward me to an appropriate
>> >>mailing list.
>>
>
> --
>                                                     ~. .~   Tk Open Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>   - baruch@...s.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
> --
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-- 
Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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