From: Jens Axboe <jaxboe@fusionio.com>
To: Rob Landley <rob@landley.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"ralf@linux-mips.org" <ralf@linux-mips.org>
Subject: Re: MIPS panic in 2.6.39 (bisected to 7eaceaccab5f)
Date: Tue, 24 May 2011 11:51:29 +0200 [thread overview]
Message-ID: <4DDB7FA1.2080407@fusionio.com> (raw)
In-Reply-To: <4DDB5673.5060206@landley.net>
On 2011-05-24 08:55, Rob Landley wrote:
> You can reproduce this under qemu by grabbing:
>
> http://landley.net/aboriginal/downloads/binaries/system-image-mips.tar.bz2
>
> If you extract that tarball and ./run-emulator.sh it should boot
> to a mips shell prompt. Now build your own vmlinux to replace the
> kernel in there with (using the attached .config), and try again,
> you should get a panic message something like:
>
> PID hash table entries: 512 (order: -1, 2048 bytes)
> Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
> Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
> Primary instruction cache 2kB, VIPT, 2-way, linesize 16 bytes.
> Primary data cache 2kB, 2-way, VIPT, no aliases, linesize 16 bytes
> Writing ErrCtl register=00000000
> Readback ErrCtl register=00000000
> Memory: 125836k/127004k available (2172k kernel code, 1168k reserved, 507k data, 156k init, 0k highmem)
> SLUB: Genslabs=9, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
> NR_IRQS:256
> CPU 0 Unable to handle kernel paging request at virtual address 00000080, epc == 803a09b0, ra == 803a0990
> Oops[#1]:
> Cpu 0
> $ 0 : 00000000 00000050 1bdc0001 00000000
> $ 4 : 00000018 00000000 00000001 00000000
> $ 8 : fffffff8 00000001 00000000 fffffffc
> $12 : fffffffc 00000000 00000008 fffffffc
> $16 : 803bce58 803bef35 803c0000 803c0000
> $20 : 80380000 00000000 00000000 00000000
> $24 : 00000000 00000000
> $28 : 80382000 80383ec8 00000000 803a0990
> Hi : 00000000
> Lo : 00000000
> epc : 803a09b0 arch_init_irq+0x38/0x15c
> Not tainted
> ra : 803a0990 arch_init_irq+0x18/0x15c
> Status: 10000002 KERNEL EXL
> Cause : 0080000c
> BadVA : 00000080
> PrId : 00019300 (MIPS 24Kc)
> Process swapper (pid: 0, threadinfo=80382000, task=803855c0, tls=00000000)
> Stack : 803a17d4 87804000 803bce58 803bef35 803c0000 803c0000 8039fac4 8039fac4
> 00000000 803bce58 80380f04 0000004a 8039f454 00000000 803beee0 00000000
> 00000000 00000000 00000000 00000000 00000000 80315f00 00000000 00000000
> 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> ...
> Call Trace:
> [<803a09b0>] arch_init_irq+0x38/0x15c
> [<8039fac4>] start_kernel+0x1f0/0x33c
> [<80315f00>] kernel_entry+0x0/0x94
>
>
> Code: 8c437048 3c021bdc 34420001 <ac620080> 24030001 3c02803c 080e827d ac437040 8c43701c
>
>
> I bisected it the problem to commit
> 7eaceaccab5f40bbfda044629a6298616aeaed50, but have no idea what
> the actual bug is. (Other than "a null pointer dereference from
> arch_init_irq", I just dunno _why_.)
That sounds odd, very far from where that commit is changing things
around. What's at arch_init_irq+0x38?
--
Jens Axboe
next prev parent reply other threads:[~2011-05-24 9:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-24 6:55 MIPS panic in 2.6.39 (bisected to 7eaceaccab5f) Rob Landley
2011-05-24 9:51 ` Jens Axboe [this message]
2011-05-24 14:39 ` Ralf Baechle
2011-05-25 7:38 ` Rob Landley
2011-05-27 7:55 ` Ralf Baechle
2011-05-27 14:00 ` Ralf Baechle
2011-05-27 20:09 ` Rob Landley
2011-05-28 10:48 ` Rob Landley
2011-05-28 16:28 ` Ralf Baechle
2011-05-28 19:56 ` Rob Landley
2011-05-28 20:56 ` Ralf Baechle
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