cmd/compile: panic: runtime error: floating point error when building on FreeBSD armv6 on RPi-B #39816
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arch-arm
Issues solely affecting the 32-bit arm architecture.
compiler/runtime
Issues related to the Go compiler and/or runtime.
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Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Weird. That chip should have hard float support.
A few other, lower priority things to try if you have the time:
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Change https://golang.org/cl/239999 mentions this issue: |
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Hi @randall77!
I wrote a simple C program which does some simple float calculation and comparison against +-Infinity from math.h. Works as expected.
The instruction seems to be
Will do and give another update.
I tried with 1.14 from http://github.com/dmgk/go-bootstrap (default bootstrap on FreeBSD ports) too with the same error. The disassembly above is from 1.14.
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I can't get a freebsd/arm machine at the moment but on linux/arm I see this: It's the same instructions, but it disassembles differently. |
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Could you post your C code test and the disassembly of it? |
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I've tried some things in the last few days, including compiling with GOARM=5, which seems to work just fine. I've also upgraded my system to FreeBSD 13-CURRENT from 2020-06-25, which produces the same error when compiling with GOARM=6. The C test code I wrote is: Compiled with -O0, the full disassembly made with objdump from binutils-2.33.1_2,1 on FreeBSD 13-CURRENT is: I‘ll disassemble the bootstrap compiler later with 13-CURRENT. Please let me know if you need anything else. I could also provide SSH to a FreeBSD on RPi-B if you like. Thank you very much! |
Your C code does produce the same instruction that was faulting in the Go code. I don't understand how the Go program faults on that instruction, but the C code passes. |
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Is there some metadata in the elf header that may be missing in the go binary? Something that suggests the FP model used in the binary? |
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I've attached the full disassembly. Created with FreeBSD 13-CURRENT, go bootstrap 1.14. I will reach out to the FreeBSD ARM community today, maybe any of them has another idea. |
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Just like SIGILL, it might be useful to see what the instruction that generated the SIGFPE is. Update #39816 Change-Id: I8b2ff692998f0b770289339537dceab96b09d1ee Reviewed-on: https://go-review.googlesource.com/c/go/+/239999 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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still applies for freebsd 13 on arm6 :( |
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What version of Go are you using (
go version)?go1.4 bootstrap
Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (
go env)?go envOutputWhat did you do?
I tried to build go1.14.4
What did you expect to see?
A successful build of go1.14.4
What did you see instead?
Build fails with SIGFPE. The output below comes from a build from FreeBSD ports. Building from source directly (using go1-4 bootstrap) results in the same error.
root@rpi-b:/usr/ports/lang/go # make -DBATCH ===> License BSD3CLAUSE accepted by the user ===> go-1.14.4,1 depends on file: /usr/local/sbin/pkg - found => go1.14.4.src.tar.gz doesn't seem to exist in /usr/ports/distfiles/. => Attempting to fetch https://golang.org/dl/go1.14.4.src.tar.gz go1.14.4.src.tar.gz 21 MB 1695 kBps 13s => go-freebsd-arm6-go1.14.tar.xz doesn't seem to exist in /usr/ports/distfiles/. => Attempting to fetch https://github.com/dmgk/go-bootstrap/releases/download/go1.14/go-freebsd-arm6-go1.14.tar.xz go-freebsd-arm6-go1.14.tar.xz 33 MB 1472 kBps 24s ===> Fetching all distfiles required by go-1.14.4,1 for building ===> Extracting for go-1.14.4,1 => SHA256 Checksum OK for go1.14.4.src.tar.gz. => SHA256 Checksum OK for go-freebsd-arm6-go1.14.tar.xz. ===> Patching for go-1.14.4,1 ===> Applying FreeBSD patches for go-1.14.4,1 from /usr/ports/lang/go/files ===> Configuring for go-1.14.4,1 ===> Building for go-1.14.4,1 cd /usr/ports/lang/go/work/go/src ; /usr/bin/env XDG_CACHE_HOME=/usr/ports/lang/go/work GOROOT_BOOTSTRAP=/usr/ports/lang/go/work/go-freebsd-arm6-bootstrap GOROOT=/usr/ports/lang/go/work/go GOROOT_FINAL=/usr/local/go GOBIN= GOOS=freebsd GOARCH=arm GO386= GOARM=6 /bin/sh make.bash -v -ap: not found go: not found Building Go cmd/dist using /usr/ports/lang/go/work/go-freebsd-arm6-bootstrap. (go1.14 freebsd/arm) cmd/dist Building Go toolchain1 using /usr/ports/lang/go/work/go-freebsd-arm6-bootstrap. math/bits math # math panic: runtime error: floating point error [signal SIGFPE: floating-point exception code=0x0 addr=0x8317bc pc=0x8317bc] goroutine 1 [running]: math.IsInf(...) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/math/bits.go:51 cmd/compile/internal/gc.(*Mpflt).Float64(0x318805e0, 0x200, 0x318df5e0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/mpfloat.go:139 +0x30 cmd/compile/internal/gc.truncfltlit(0x318805e0, 0x31440e40, 0x9c4af0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/const.go:168 +0x90 cmd/compile/internal/gc.convertVal(0x9c4af0, 0x318805e0, 0x31440e40, 0x0, 0x9c4af0, 0x318df5c0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/const.go:398 +0xb8 cmd/compile/internal/gc.convlit1(0x318880a0, 0x31440e40, 0x0, 0x3177540c, 0x318e6301) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/const.go:272 +0x248 cmd/compile/internal/gc.assignconvfn(0x318880a0, 0x31440e40, 0x3177540c, 0x318e6320) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/subr.go:805 +0x74 cmd/compile/internal/gc.assignconv(0x318880a0, 0x31440e40, 0x9e1072, 0xd, 0x318e6320) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/subr.go:792 +0x5c cmd/compile/internal/gc.typecheckarraylit(0x31440e40, 0xffffffff, 0xffffffff, 0x31760d50, 0xb, 0xb, 0x9e1072, 0xd, 0xa, 0x0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/typecheck.go:2999 +0x180 cmd/compile/internal/gc.typecheckcomplit(0x3187fc20, 0x0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/typecheck.go:2785 +0x1cc0 cmd/compile/internal/gc.typecheck1(0x3187fc20, 0x12, 0x0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/typecheck.go:860 +0x3cf4 cmd/compile/internal/gc.typecheck(0x3187fc20, 0x12, 0x0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/typecheck.go:300 +0x640 cmd/compile/internal/gc.typecheckas(0x318880f0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/typecheck.go:3172 +0x94 cmd/compile/internal/gc.typecheck1(0x318880f0, 0x1, 0x0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/typecheck.go:1900 +0x29b8 cmd/compile/internal/gc.typecheck(0x318880f0, 0x1, 0x0) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/typecheck.go:300 +0x640 cmd/compile/internal/gc.Main(0xa00d70) /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/internal/gc/main.go:580 +0x2d18 main.main() /home/dg/golang/go-bootstrap/go-freebsd-arm6-bootstrap/src/cmd/compile/main.go:52 +0x98 bootstrap/sort bootstrap/math/bits bootstrap/container/heap bootstrap/internal/goversion bootstrap/internal/race go tool dist: FAILED: /usr/ports/lang/go/work/go-freebsd-arm6-bootstrap/bin/go install -gcflags=-l -tags=math_big_pure_go compiler_bootstrap -v bootstrap/cmd/...: exit status 2 *** Error code 2 Stop. make: stopped in /usr/ports/lang/goThe text was updated successfully, but these errors were encountered: