Date: Thu, 16 Nov 2017 16:45:43 -0500 From: Hyun Hwang <hhwang@sent.com> To: Ian Lepore <ian@freebsd.org> Cc: freebsd-arm@freebsd.org Subject: Re: Raspberry Pi 2 - I2C related kpanic @ r324169 Message-ID: <1510868743.702301.1175172960.770CBAE8@webmail.messagingengine.com> In-Reply-To: <1510852630.99235.381.camel@freebsd.org> References: <1510787451.4128802.1173973544.3E3E0813@webmail.messagingengine.com> <1510852630.99235.381.camel@freebsd.org>
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On Thu, Nov 16, 2017, at 12:17, Ian Lepore wrote: > I broke something. :) Please do not take my message was to blame you; I greatly appreciate what you did to support the repeated start condition on RPi. > Is it easily reproducible? This happens quite randomly, but I managed to reproduce it several times more, especially within gdb(1)-ing my application. > I don't expect witness to add anything; given the FAR value, it looks like a NULL pointer problem. With WITNESS (using standard sys/arm/conf/RPI2 kernel configuration), at least the panic gave me the exact instruction as well as additional messages: ``` Kernel page fault with the following non-sleepable locks held: exclusive sleep mutex bcm_bsc (bcm_bsc) r = 0 (0xc3d2f688) locked @ /usr/src/sys/arm/broadcom/bcm2835/bcm2835_bsc.c:480 stack backtrace: Fatal kernel mode data abort: 'Translation Fault (L2)' on read ... snip (very similar to the one in the previous message) ... Stopped at bcm_bsc_fill_tx_fifo+0x74: ldrb r3, [r2] db> ``` Hope this helps a bit more. > could you do a "bt" at the db> propmt and paste that output, please? Unfortunately, when the kernel panics, the USB keyboard stops working so I cannot type anything... I will try to find other means that can give input to the debugger. (maybe UART serial?) Thank you. -- Hyun Hwang
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