Date: Tue, 22 Sep 2020 12:15:20 -0700 From: Mark Millard <marklmi@yahoo.com> To: Brandon Bergren <bdragon@FreeBSD.org> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: head -r365932 on PowerMac G5 (2 dual-core sockets): Crashes before login prompt if powerd is enabled in /etc/rc.conf Message-ID: <E23CF7F6-B69C-44C7-B356-4AB65E011268@yahoo.com> In-Reply-To: <11fe573a-24c3-47be-95ed-c601ec54f168@www.fastmail.com> References: <52783D16-5DCA-45BC-9238-2518326454A1@yahoo.com> <6E99EE39-D2B8-415A-A5BF-823C0F0C22D6@yahoo.com> <cd9d2b72-219f-4550-a437-4ac3aa1da66d@www.fastmail.com> <AF27169A-00FC-4984-83C2-307EA885D7A1@yahoo.com> <11fe573a-24c3-47be-95ed-c601ec54f168@www.fastmail.com>
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On 2020-Sep-22, at 12:00, Brandon Bergren <bdragon at FreeBSD.org> = wrote: > Weird, that read_scom has the "inlines not being inlined" problem. >=20 > Are you sure your local tree has my = https://svnweb.freebsd.org/base/head/?view=3Drevision&revision=3D365441 = fixes? # svnlite diff /usr/src/sys/conf/kern.pre.mk # svnlite info /usr/src Path: . Working Copy Root Path: /usr/src URL: https://svn.freebsd.org/base/head Relative URL: ^/head Repository Root: https://svn.freebsd.org/base Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f Revision: 365932 Node Kind: directory Schedule: normal Last Changed Author: jrtc27 Last Changed Rev: 365932 Last Changed Date: 2020-09-20 16:20:18 -0700 (Sun, 20 Sep 2020) But it used -O instead of -O2 . . . # Meta data file = /usr/obj/powerpc64vtsc_clang/powerpc.powerpc64/usr/src/powerpc.powerpc64/s= ys/GENERIC64vtsc-NODBG/pcr.o.meta CMD cc -target powerpc64-unknown-freebsd13.0 = --sysroot=3D/usr/obj/powerpc64vtsc_clang/powerpc.powerpc64/usr/src/powerpc= .powerpc64/tmp = -B/usr/obj/powerpc64vtsc_clang/powerpc.powerpc64/usr/src/powerpc.powerpc64= /tmp/usr/bin -c -O -pipe -g -nostdinc -I. -I/usr/src/sys = -I/usr/src/sys/contrib/ck/include -I/usr/src/sys/contrib/libfdt = -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common = -msoft-float -fPIC -fno-omit-frame-pointer = -fdebug-prefix-map=3D./machine=3D/usr/src/sys/powerpc/include = -mno-altivec -msoft-float -mabi=3Delfv2 -ffreestanding -fwrapv = -fstack-protector -gdwarf-2 -Wall -Wredundant-decls -Wnested-externs = -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual = -Wundef -Wno-pointer-sign -D__printf__=3D__freebsd_kprintf__ = -Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas = -Wno-error-tautological-compare -Wno-error-empty-body = -Wno-error-parentheses-equality -Wno-error-unused-function = -Wno-error-pointer-sign -Wno-error-shift-negative-value = -Wno-address-of-packed-member -Wno-format-zero-length = -std=3Diso9899:1999 /usr/src/sys/powerpc/cpufreq/pcr.c CMD ctfconvert -L VERSION -g pcr.o CWD = /usr/obj/powerpc64vtsc_clang/powerpc.powerpc64/usr/src/powerpc.powerpc64/s= ys/GENERIC64vtsc-NODBG TARGET pcr.o OODATE offset.inc assym.inc > On Tue, Sep 22, 2020, at 1:55 PM, Mark Millard wrote: >>=20 >>=20 >> On 2020-Sep-22, at 08:58, Brandon Bergren <bdragon@FreeBSD.org> = wrote: >>=20 >>> In theory, this would also crash if you did "sysctl dev.cpu.0.freq". >>=20 >> Yep, that dies with a backtrace but not taking input to >> the db> prompt. >>=20 >> The call stack looks to have the same sequence. >>=20 >> Different srr0 and lr values were listed when I tried >> that: >>=20 >> srr0=3D0x8004'4000'0000'0000 (0xc004'4000'0000'0000) >> . . . >> lr =3D0x8004'4000'0000'0000 (0xc004'4000'0000'0000) >>=20 >>=20 >>> You sure the lack of a backtrace isn't just that you are using a = nodebug config? >>=20 >> Back when I was using the FireWire based debugging I >> discovered that it continued to report material after >> the monitor updates stopped. I learned to not use >> the last message on screen to guess where it was >> having a problem, other than "sometime after the >> last message shown". >>=20 >>> Could you please disassemble read_scom? >>=20 >> Sure: >>=20 >> 0000000000ad7f24 <read_scom> addis r2,r12,132 >> 0000000000ad7f28 <read_scom+0x4> addi r2,r2,220 >> 0000000000ad7f2c <read_scom+0x8> mflr r0 >> 0000000000ad7f30 <read_scom+0xc> std r31,-8(r1) >> 0000000000ad7f34 <read_scom+0x10> std r0,16(r1) >> 0000000000ad7f38 <read_scom+0x14> stdu r1,-64(r1) >> 0000000000ad7f3c <read_scom+0x18> mr r31,r1 >> 0000000000ad7f40 <read_scom+0x1c> std r29,40(r31) >> 0000000000ad7f44 <read_scom+0x20> std r30,48(r31) >> 0000000000ad7f48 <read_scom+0x24> bl 0000000000ad7e58 <mfmsr> >> 0000000000ad7f4c <read_scom+0x28> mr r30,r3 >> 0000000000ad7f50 <read_scom+0x2c> rldicl r3,r3,48,1 >> 0000000000ad7f54 <read_scom+0x30> rotldi r3,r3,16 >> 0000000000ad7f58 <read_scom+0x34> bl 0000000000ad7e6c <mtmsr> >> 0000000000ad7f5c <read_scom+0x38> bl 0000000000ad7e84 <isync> >> 0000000000ad7f60 <read_scom+0x3c> lis r3,16512 >> 0000000000ad7f64 <read_scom+0x40> ori r3,r3,33024 >> 0000000000ad7f68 <read_scom+0x44> mtspr 276,r3 >> 0000000000ad7f6c <read_scom+0x48> bl 0000000000ad7e84 <isync> >> 0000000000ad7f70 <read_scom+0x4c> mfspr r29,277 >> 0000000000ad7f74 <read_scom+0x50> mr r30,r29 >> 0000000000ad7f78 <read_scom+0x54> rldicl r29,r29,32,32 >> 0000000000ad7f7c <read_scom+0x58> mfspr r3,276 >> 0000000000ad7f80 <read_scom+0x5c> mr r3,r30 >> 0000000000ad7f84 <read_scom+0x60> bl 0000000000ad7e6c <mtmsr> >> 0000000000ad7f88 <read_scom+0x64> bl 0000000000ad7e84 <isync> >> 0000000000ad7f8c <read_scom+0x68> mr r3,r29 >> 0000000000ad7f90 <read_scom+0x6c> ld r30,48(r31) >> 0000000000ad7f94 <read_scom+0x70> ld r29,40(r31) >> 0000000000ad7f98 <read_scom+0x74> addi r1,r1,64 >> 0000000000ad7f9c <read_scom+0x78> ld r0,16(r1) >> 0000000000ad7fa0 <read_scom+0x7c> mtlr r0 >> 0000000000ad7fa4 <read_scom+0x80> ld r31,-8(r1) >> 0000000000ad7fa8 <read_scom+0x84> blr >>=20 >>=20 >>> On Tue, Sep 22, 2020, at 12:46 AM, Mark Millard via freebsd-ppc = wrote: >>>>=20 >>>>=20 >>>> On 2020-Sep-21, at 21:34, Mark Millard <marklmi at yahoo.com> = wrote: >>>>=20 >>>>> This was discovered while doing a head -r363590 -> -r365932 >>>>> upgrade to FreeBSD. (A non-debug system context.) >>>>>=20 >>>>> It first showed up only having updated the kernel. It still >>>>> shows up after updating world as well. It is now running: >>>>>=20 >>>>> # uname -apKU >>>>> FreeBSD FBSDG5L2 13.0-CURRENT FreeBSD 13.0-CURRENT #16 r365932M: = Sun Sep 20 19:57:07 PDT 2020 = root@FBSDFHUGE:/usr/obj/powerpc64vtsc_clang/powerpc.powerpc64/usr/src/powe= rpc.powerpc64/sys/GENERIC64vtsc-NODBG powerpc powerpc64 1300115 1300115 >>>>>=20 >>>>> but with /etc/rc.conf having powerd disabled: >>>>>=20 >>>>> #powerd_enable=3D"YES" >>>>>=20 >>>>> The crash now is now silent, not getting to the db> prompt >>>>> and not showing any messages or backtrace. >>>>>=20 >>>>> Prior to world being updated it crashed with a traceback. >>>>> A quick summary from a camera picture: >>>>>=20 >>>>> fatal kernel trap: >>>>> . . . >>>>> pid =3D 1126, comm =3D powerd >>>>> . . . >>>>> kernel PGM trap by 0: . . . >>>>> at pcr_get+0x4c >>>>> at CPUFREQ_DRV_GET+0x78 >>>>> at cpufreq_get_frequency+0x20 >>>>> at cpufreq_get_level+0x2c >>>>> at cf_get_method+0x20c >>>>> at CPUFREQ_GET+0x78 >>>>> at cpufreq_curr_sysctl+0x70 >>>>> at sysctl_root_handler_locked+0x10c >>>>> at sysctl_root+0x26c >>>>> at userland_sysctl+0x14c >>>>> at sys___sysctl+0x8c >>>>> at syscallenter+0x188 >>>>> at syscall+0x60 >>>>> at trap+0x498 >>>>> at powerpc_interrrupt+0x110 >>>>> user SC trap . . . >>>>>=20 >>>>> After this I tried to make a dump and then proceeded >>>>> with disabling powerd in /etc/rc.conf and doing the >>>>> world update. >>>>>=20 >>>>> Unfortunately, while a dump was written, the core.txt >>>>> file from the -r365932 world boot that processed the >>>>> dump reported "invalid corefile" all over the place. >>>>>=20 >>>>> With powerpd disabled the G5 seems to be operational. >>>>> But turning powerd back on in /etc/rc.conf and rebooting >>>>> prevents the boot from completing, no messages, no >>>>> db> prompt. So I now leave powerd disabled. >>>>=20 >>>> Some additional low-level information: >>>>=20 >>>> For exception 0x700 (program) the screen picture >>>> shows (but I've added ' use): >>>>=20 >>>> srr0=3D0x0 (0x4000'0000'0000'0000) >>>> . . . >>>> lr =3D0x0 (0x4000'0000'0000'0000) >>>>=20 >>>> The kernel PGM trap notice does report: >>>>=20 >>>> ctr=3D0xc000'0000'00ad'7ad4 >>>> (the start of pcr_get but with the 0xc >>>> prefix) >>>>=20 >>>> I'll remind of the pcr_get+0x4c report in the summary. >>>>=20 >>>> objdump for /boot/kernel/kernel reports: >>>>=20 >>>> 0000000000ad7ad4 <pcr_get> addis r2,r12,132 >>>> 0000000000ad7ad8 <pcr_get+0x4> addi r2,r2,1324 >>>> 0000000000ad7adc <pcr_get+0x8> cmpldi r4,0 >>>> 0000000000ad7ae0 <pcr_get+0xc> beq 0000000000ad7b48 = <pcr_get+0x74> >>>> 0000000000ad7ae4 <pcr_get+0x10> mflr r0 >>>> 0000000000ad7ae8 <pcr_get+0x14> std r31,-8(r1) >>>> 0000000000ad7aec <pcr_get+0x18> std r0,16(r1) >>>> 0000000000ad7af0 <pcr_get+0x1c> stdu r1,-64(r1) >>>> 0000000000ad7af4 <pcr_get+0x20> mr r31,r1 >>>> 0000000000ad7af8 <pcr_get+0x24> std r29,40(r31) >>>> 0000000000ad7afc <pcr_get+0x28> mr r29,r3 >>>> 0000000000ad7b00 <pcr_get+0x2c> li r3,-1 >>>> 0000000000ad7b04 <pcr_get+0x30> std r30,48(r31) >>>> 0000000000ad7b08 <pcr_get+0x34> mr r30,r4 >>>> 0000000000ad7b0c <pcr_get+0x38> std r3,32(r4) >>>> 0000000000ad7b10 <pcr_get+0x3c> std r3,24(r4) >>>> 0000000000ad7b14 <pcr_get+0x40> std r3,16(r4) >>>> 0000000000ad7b18 <pcr_get+0x44> std r3,8(r4) >>>> 0000000000ad7b1c <pcr_get+0x48> std r3,0(r4) >>>> 0000000000ad7b20 <pcr_get+0x4c> bl 0000000000ad7f2c = <read_scom+0x8> >>>> 0000000000ad7b24 <pcr_get+0x50> rldicl r3,r3,8,62 >>>> 0000000000ad7b28 <pcr_get+0x54> li r4,10000 >>>> 0000000000ad7b2c <pcr_get+0x58> stw r4,0(r30) >>>> 0000000000ad7b30 <pcr_get+0x5c> cmpldi r3,1 >>>> 0000000000ad7b34 <pcr_get+0x60> beq 0000000000ad7b50 = <pcr_get+0x7c> >>>> 0000000000ad7b38 <pcr_get+0x64> cmpldi r3,2 >>>> 0000000000ad7b3c <pcr_get+0x68> bne 0000000000ad7b58 = <pcr_get+0x84> >>>> 0000000000ad7b40 <pcr_get+0x6c> li r3,2500 >>>> 0000000000ad7b44 <pcr_get+0x70> b 0000000000ad7b54 = <pcr_get+0x80> >>>> 0000000000ad7b48 <pcr_get+0x74> li r3,22 >>>> 0000000000ad7b4c <pcr_get+0x78> blr >>>> 0000000000ad7b50 <pcr_get+0x7c> li r3,5000 >>>> 0000000000ad7b54 <pcr_get+0x80> stw r3,0(r30) >>>> 0000000000ad7b58 <pcr_get+0x84> std r29,16(r30) >>>> 0000000000ad7b5c <pcr_get+0x88> ld r30,48(r31) >>>> 0000000000ad7b60 <pcr_get+0x8c> ld r29,40(r31) >>>> 0000000000ad7b64 <pcr_get+0x90> addi r1,r1,64 >>>> 0000000000ad7b68 <pcr_get+0x94> ld r0,16(r1) >>>> 0000000000ad7b6c <pcr_get+0x98> li r3,0 >>>> 0000000000ad7b70 <pcr_get+0x9c> mtlr r0 >>>> 0000000000ad7b74 <pcr_get+0xa0> ld r31,-8(r1) >>>> 0000000000ad7b78 <pcr_get+0xa4> blr >=20 --=20 Brandon Bergren bdragon@FreeBSD.org =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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