https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122345
Bug ID: 122345
Summary: On armv7hl, go immediately crashes on invocation
Product: gcc
Version: 15.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: go
Assignee: ian at airs dot com
Reporter: [email protected]
Target Milestone: ---
When building GCC 15 (current release branch, e.g.
21e75aa0ad20f6ea05030455cef6e15e34ff0f8d) for host armv7hl, the resulting go
compiler immediately crashes with SIGBUS, even on "go version" invocation:
unexpected fault address 0xa4b4f7
fatal error: fault
[signal SIGBUS: bus error code=0x1 addr=0xa4b4f7 pc=0xf74a5140]
goroutine 1 [running, locked to thread]:
runtime.dopanic__m
/gcc/libgo/go/runtime/panic.go:1204
runtime.fatalthrow
/gcc/libgo/go/runtime/panic.go:1073
runtime.throw
/gcc/libgo/go/runtime/panic.go:1044
runtime.sigpanic
/gcc/libgo/go/runtime/signal_unix.go:714
os.statNolog
/gcc/libgo/go/os/stat_unix.go:35
os.Stat
/gcc/libgo/go/os/stat.go:13
os/exec.findExecutable
/gcc/libgo/go/os/exec/lp_unix.go:21
os_1exec.LookPath
/gcc/libgo/go/os/exec/lp_unix.go:41
internal_1execabs.LookPath
/gcc/libgo/go/internal/execabs/execabs.go:35
cmd_1go_1internal_1work.cmd_1go_1internal_1work..init2
/gcc/libgo/go/cmd/go/internal/work/gccgo.go:35
cmd_1go_1internal_1work..import
/gcc/libgo/go/cmd/go/internal/work/gccgo.go:30
__go_init_main
/gcc/gotools/../libgo/go/cmd/go/alldocs.go:3267
runtime.main
/gcc/libgo/go/runtime/proc.go:263
The cause is a misaligned access.
In GCC 16 (current master branch, e.g.
eb717a8f4ea9f5eebb3d5add0ca4a33d74febd1a), this works.
I ran a bisect and the commit which fixes this crash is:
2edb50a310896da72710dba7724a3b4a541a1cbb is the first works commit
commit 2edb50a310896da72710dba7724a3b4a541a1cbb
Author: Alexandre Oliva <[email protected]>
Date: Mon Jun 2 20:21:45 2025 -0300
[lra] force reg update after spilling to memory [PR120424]
Reproducer as used for bisecting (copy-paste of distro gcc build options):
<path to gcc>/configure 'CFLAGS= -O2 -funwind-tables
-fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -g'
'CXXFLAGS= -O2 -funwind-tables -fasynchronous-unwind-tables
-fstack-clash-protection -Werror=return-type -g' 'XCFLAGS= -O2 -funwind-tables
-fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -g'
'TCFLAGS= -O2 -funwind-tables -fasynchronous-unwind-tables
-fstack-clash-protection -Werror=return-type -g' 'GDCFLAGS= -O2 -funwind-tables
-fasynchronous-unwind-tables -fstack-clash-protection -g' --prefix=/usr/local
--enable-languages=go --enable-host-shared --enable-checking=release
--disable-werror --with-gxx-include-dir=/usr/include/c++/15
--with-libstdcxx-zoneinfo=/usr/share/zoneinfo --enable-ssp --disable-libssp
--disable-libvtv --enable-cet=auto --disable-libcc1 --enable-plugin
--with-bugurl=https://bugs.opensuse.org/ '--with-pkgversion=SUSE Linux'
--with-slibdir=/lib --with-system-zlib --enable-libstdcxx-allocator=new
--disable-libstdcxx-pch --enable-version-specific-runtime-libs
--with-gcc-major-version-only --enable-linker-build-id --enable-linux-futex
--enable-gnu-indirect-function --program-suffix=-15 --without-system-libunwind
--with-cpu=generic-armv7-a --with-float=hard --with-abi=aapcs-linux
--with-fpu=vfpv3-d16 --disable-sjlj-exceptions --enable-link-serialization
--build=armv7hl-suse-linux-gnueabi --host=armv7hl-suse-linux-gnueabi
--disable-bootstrap
make -j<...>
env LD_LIBRARY_PATH=$PWD/armv7hl-suse-linux-gnueabi/libgo/.libs/ gotools/go
version
