Date: Sun, 15 Apr 2018 10:53:56 -0700 From: Stanislav Sedov <stas@freebsd.org> To: Udit agarwal <dev.madaari@gmail.com> Cc: freebsd-arm@freebsd.org, Russell Haley <russ.haley@gmail.com> Subject: Re: kernel panic while building SDIO driver Message-ID: <EB523BC3-316D-4907-8238-AF9E15F59DD7@freebsd.org> In-Reply-To: <CAM0bxh9OUK%2BJOuxig6EsiaCB6ke5=MJPab=2EHZ23QyvXN_a6A@mail.gmail.com>
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> On Apr 15, 2018, at 8:01 AM, Udit agarwal <dev.madaari@gmail.com> wrote: > > Hi, > I have been trying to build the kernel (for BBB) invoking SDIO driver from > FreeBSD latest src tree using BEAGLEBONE-MMCCAM kernconf file(Yes, I added > that file manually). I seems like the kernel panics due to sleep > lock(complete logs: > https://gist.github.com/madaari/4779d75e7f1ab88369318a40cb026d9b ) > > mmc_dev_async(async_code=0x20, path_id=1, target_id=0, lun_id=0 > Got AC_PATH_REGISTERED -- whatever... > mmc_dev_async(async_code=0x20, path_id=1, target_id=ffffffff, > lun_id=ffffffff > usbus0: 480Mbps High Speed USB v2.0 > usbus1: 480Mbps High Speed USB v2.0 > (noperiph:sdhci_slot0:0:-1:ffffffff): XPT_SCAN_{BUS,TGT,LUN} > Kernel page fault with the following non-sleepable locks held: > exclusive sleep mutex CAM device lock (CAM device lock) r = 0 (0xc30e1464) > lock2 > stack backtrace: > Fatal kernel mode data abort: 'Translation Fault (L1)' on read > trapframe: 0xd0dc0ac0 > FSR=00000005, FAR=00000010, spsr=60000013 > r0 =00000061, r1 =00000188, r2 =d0dc0a8c, r3 =60000013 > r4 =c30e0000, r5 =c30dec40, r6 =00000000, r7 =d0dc0b68 > r8 =c086f528, r9 =c068f050, r10=00000000, r11=d0dc0d10 > r12=00000062, ssp=d0dc0b50, slr=c002b77c, pc =c002b5c0 > [ thread pid 4 tid 100048 ] > Stopped at mmc_action+0x94: ldr r6, [r6, #0x010] > db> > > Any idea how to resolve this? > It actually panicked on read fault (see L1 translation failure) on trying to read the address which isn’t mapped. From the obstruction printed, it appears to be r6, which is 0x0 — most likely a NULL pointer dereference in the code. What is at mmc_action+0x95 in your kernel? -- Stashelp
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