Date: Wed, 29 Aug 2018 13:27:27 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Yuri Pankov <yuripv@yuripv.net> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: r336921 broke booting on MBP 2017, EFIRT related Message-ID: <20180829102727.GD2340@kib.kiev.ua> In-Reply-To: <499f05f4-4fab-9b31-5d37-83ecb554013c@yuripv.net> References: <499f05f4-4fab-9b31-5d37-83ecb554013c@yuripv.net>
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On Wed, Aug 29, 2018 at 12:37:52PM +0300, Yuri Pankov wrote: > Hi, > > I've noticed that all recent snapshots (ALPHA3, ALPHA2, ALPHA1, > 20180802) fail to boot on MBP 2017: > > kbd0 at kbdmux0 > netmap: loaded module > nexus0 > > Fatal trap 12: page fault while in kernel mode > cpuid = 2: apic id = 02 > fault virtual address = 0x74c64a50 > fault code = supervisor read data, page not present > instruction pointer = 0x20: 0x7abece31 > stack pointer = 0x28: 0xffffffff82b2f7c0 > frame pointer = 0x28: 0xffffffff82b2f810 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, long 1, def32 0, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 0 (swapper) > [ thread pid 0 tid 100000 ] > Stopped at 0x7abece31: calll *0x18(%rax) > db> > > Sadly, there's no support for internal keyboard yet (it's connected via > SPI), and external USB one stops working. > > A (not so quick) bisect is pointing at r336921, which enabled EFIRT. > > Some questions here: > - is this something that can/should be fixed? > - can we print some "enabling EFIRT" message to the console to make > guesses about the problem source a bit easier? It is not in 'enabling'. Looking at the faulting VA, I believe that it occurs inside the BIOS code. Disable efirt by removing the kernel option, then try to load the module at runtime. Does it still fault ? Also, get the efi mem map for the machine and look at which region the faulting address and the faulting instruction belong.help
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