Kernel Panic on BeagleBone Black

[Shawn Webb]

On Jul 30, 2014 11:30 AM -0600, Ian Lepore wrote:
> On Wed, 2014-07-30 at 08:19 -0400, Shawn Webb wrote:
> > Hey All,
> > 
> > I've just updated to a recent HEAD (r269240). I get a kernel panic
> > almost immediately on boot. Below is the log.
> > 
> > ==== Start of dump ====
> > cpsw0: <3-port Switch Ethernet Subsystem> mem 0x4a100000-0x4a103fff irq 40,41,42,43 on simplebus0
> > cpsw0: CPSW SS Version 1.12 (0)
> > cpsw0: Initial queue size TX=128 RX=384
> > cpsw0: Ethernet address: 1c:ba:8c:e4:6d:6a
> > cpsw0: Failed to read from PHY.
> > cpsw0: attaching PHYs failed
> > 
> > vm_fault(0xc070b9e0, 0, 1, 0) -> 1
> > Fatal kernel mode data abort: 'Translation Fault (S)'
> > trapframe: 0xc080eb28
> > FSR=00000005, FAR=00000018, spsr=80000193
> > r0 =c266f280, r1 =00000000, r2 =00000019, r3 =60000193
> > r4 =00000000, r5 =c266f280, r6 =00000006, r7 =c05c99b4
> > r8 =c266f280, r9 =c26ca28c, r10=c26c80c8, r11=c080eb88
> > r12=00000000, ssp=c080eb78, slr=c05ee1cc, pc =c03d2614
> > 
> > [ thread pid 0 tid 100000 ]
> > Stopped at      device_delete_child+0x14:       ldr     r1, [r4, #0x018]
> > db> bt
> > Tracing pid 0 tid 100000 td 0xc070b6d0
> [...]
> > Unable to unwind further
> > ==== End of dump ====
> > 
> > If there's anything I can do, let me know.
> > 
> > Thanks,
> > 
> > Shawn
> 
> Hmm, I can't reproduce this on my BB White at r269302.  The real error
> is "Failed to read from PHY".  The kernel abort was just accidental
> fallout from trying to clean up and detach the ethernet driver since it
> failed to init properly (error paths never get tested enough).
> 
> What was the prior release you were on that worked okay?
> 
> Since I just made a series of changes to armv6 busdma I'm tempted to
> suspect them, even though there shouldn't be any DMA involved in talking
> to the PHY.  Still, it would be interesting to know if backing off to
> r269134 makes the problem go away.
> 
> -- Ian
> 
> 

The release prior worked okay. I did get occasional kernel panics
(though, I didn't have time to do a backtrace and post here about it).
I'm unsure what svn rev the prior build was at. I can try reverting that
revision you mentioned tonight and report back if you'd like.

Thanks,

Shawn
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