Date: Thu, 16 Nov 2017 10:17:10 -0700 From: Ian Lepore <ian@freebsd.org> To: Hyun Hwang <hhwang@sent.com>, freebsd-arm@freebsd.org Subject: Re: Raspberry Pi 2 - I2C related kpanic @ r324169 Message-ID: <1510852630.99235.381.camel@freebsd.org> In-Reply-To: <1510787451.4128802.1173973544.3E3E0813@webmail.messagingengine.com>
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On Wed, 2017-11-15 at 18:10 -0500, Hyun Hwang wrote: > Hello, > > I was trying to get readings from my accelerometer (MMA8451, requires > I2C repeated start) via I2C, and suddenly kernel panicked. > This is what appeared on the console: > ``` > Fatal kernel mode data abort: 'Translation Fault (L1)' on read > trapframe: 0xd775bcf0 > FSR=00000005, FAR=00000000, spsr=40000013 > r0 =c07ce200, r1 =ff704000, r2 =00000000, r3 =00000000 > r4 =c39eb680, r5 =00000000, r6 =0000ffff, r7 =c06e569c > r8 =c07d79e8, r9 =c07d79e8, r10=c3986b00, r11=d775bd90 > r12=c090b288, ssp=d775bd80, slr=c0653334, pc =c0653488 > > [ thread pid 11 tid 100032 ] > Stopped at bcm_bsc_fill_tx_fifo+0x74: > db> > ``` > My Raspberry Pi 2 (v1.1) is currently running r325595 (armv7) with no > WITNESS option given. I am currently rebuilding the kernel with > WITNESS option given, to see if I can get more detailed messages. > > Judging by the function name, it looks like the I2C repeated start > fix applied on r324169 had some problem? That was my first suspicion: I broke something. :) Is it easily reproducible? I don't expect witness to add anything; given the FAR value, it looks like a NULL pointer problem. If you can make it happen easily, could you do a "bt" at the db> propmt and paste that output, please? -- Ianhome | help
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