spurious crashes when compiling openjdk-21 in focal

[Vladimir Petko]

When compiling openjdk-21 in focal on risc-V, the gcc compiler spuriously crashes with SIGSEGV.
The crash happens with different files, and running the failing command in isolation succeeds.

The failing build logs[1].

The crash can be reproduced locally in RISC-V vm:
---
riscv64-linux-gnu-g++-9: internal compiler error: Segmentation fault signal terminated program cc1plus
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.
---
It has the following backtrace:

#0 0x0000000000a77d1a in linemap_lookup(line_maps*, unsigned int) ()

#1 0x0000000000a78370 in linemap_resolve_location(line_maps, unsigned int, location_resolution_kind, line_map_ordinary const*) ()
Backtrace stopped: frame did not save the PC

[1]https://launchpadlibrarian.net/699320896/buildlog_ubuntu-focal-riscv64.openjdk-21_21.0.1+12-2~20.04_BUILDING.txt.gz

Note: the build succeeds when build with -security pocket only

[Vladimir Petko (vpa1977)]

coredump from the failing build

[Vladimir Petko (vpa1977)]

sample failing command

[Vladimir Petko (vpa1977)]

SIGSEGV crash in a different place

[Łukasz Zemczak (sil2100)]

Hello Vladimir, or anyone else affected,

Accepted openjdk-21 into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/openjdk-21/21.0.1+12-2~20.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Vladimir Petko (vpa1977)]

Marking as verification done, due to the error in the changelog (bug referenced as LP: XXXXX instead of launchpad bug XXXXX).

This bug is in new state.
To workaround the issue openjdk-21 is compiled with gcc-10 in focal.

[Brian Murray (brian-murray)]

To be clear the changelog referenced it as LP: #2044899 which then made the bug a part of the SRU process. To have the bug not be included you could use LP #2044899 or just launchpad bug 2044899 as you mentioned.

[Brian Murray (brian-murray)]

The verification of the Stable Release Update for openjdk-21 has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

[Pushkar Kulkarni (pushkarnk)]

g++ seems to have segfaulted whild building openjdk-lts (openjdk-11) on focal/riscv-64 (precisely, while running a hotspot test):

========================================================================================

( /bin/rm -f /<<PKGBUILDDIR>>/build/hotspot/variant-zero/libjvm/gtest/objs/test_align.o.log && /usr/bin/riscv64-linux-gnu-g++-9 -MMD -MF /<<PKGBUILDDIR>>/build/hotspot/variant-zero/libjvm/gtest/objs/test_align.d.tmp -I/<<PKGBUILDDIR>>/build/hotspot/variant-zero/libjvm/gtest/objs/precompiled -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -D_GNU_SOURCE -D_REENTRANT -pipe -fno-rtti -fno-exceptions -fvisibility=hidden -fno-strict-aliasing -fno-omit-frame-pointer -fcheck-new -fstack-protector -std=gnu++98 -DLIBC=gnu -DSUPPORTS_CLOCK_MONOTONIC -DLINUX -Wpointer-arith -Wsign-compare -Wunused-function -Wunused-value -Woverloaded-virtual -fPIC -fmacro-prefix-map=/<<PKGBUILDDIR>>/= -DVM_LITTLE_ENDIAN -D_LP64=1 -fno-delete-null-pointer-checks -fno-lifetime-dse -Wno-format-zero-length -Wtype-limits -Wuninitialized -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -Wformat -fno-stack-protector -Wno-deprecated-declarations -DPRODUCT -DTARGET_ARCH_zero -DINCLUDE_SUFFIX_OS=_linux -DINCLUDE_SUFFIX_CPU=_zero -DINCLUDE_SUFFIX_COMPILER=_gcc -DTARGET_COMPILER_gcc -DRISCV -DHOTSPOT_LIB_ARCH='"riscv64"' -DZERO -DCC_INTERP -DZERO_LIBARCH='"riscv64"' -DINCLUDE_JVMCI=0 -DINCLUDE_AOT=0 -DINCLUDE_G1GC=0 -DINCLUDE_EPSILONGC=0 -DINCLUDE_ZGC=0 -DINCLUDE_SHENANDOAHGC=0 -DINCLUDE_JFR=0 -I/<<PKGBUILDDIR>>/src/hotspot/share -I/<<PKGBUILDDIR>>/src/hotspot/os/linux -I/<<PKGBUILDDIR>>/src/hotspot/os/posix -I/<<PKGBUILDDIR>>/src/hotspot/cpu/zero -I/<<PKGBUILDDIR>>/src/hotspot/os_cpu/linux_zero -I/<<PKGBUILDDIR>>/build/hotspot/variant-zero/gensrc -I/<<PKGBUILDDIR>>/src/hotspot/share/precompiled -I/<<PKGBUILDDIR>>/src/hotspot/share/include -I/<<PKGBUILDDIR>>/src/hotspot/os/posix/include -I/<<PKGBUILDDIR>>/build/support/modules_include/java.base -I/<<PKGBUILDDIR>>/build/support/modules_include/java.base/linux -I/<<PKGBUILDDIR>>/src/java.base/share/native/libjimage -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -Wformat -fno-stack-protector -Wno-deprecated-declarations -Wdate-time -D_FORTIFY_SOURCE=2 -DDEB_MULTIARCH="\"riscv64-linux-gnu\"" -I/<<PKGBUILDDIR>>/test/fmw/gtest -I/<<PKGBUILDDIR>>/test/fmw/gtest/include -I/<<PKGBUILDDIR>>/test/hotspot/gtest -g -Wno-undef -Wno-stringop-overflow -O3 -c -o /<<PKGBUILDDIR>>/build/hotspot/variant-zero/libjvm/gtest/objs/test_align.o /<<PKGBUILDDIR>>/test/hotspot/gtest/utilities/test_align.cpp > >(/usr/bin/tee -a /<<PKGBUILDDIR>>/build/hotspot/variant-zero/libjvm/gtest/objs/test_align.o.log) 2> >(/usr/bin/tee -a /<<PKGBUILDDIR>>/build/hotspot/variant-zero/libjvm/gtest/objs/test_align.o.log >&2) || ( exitcode=$? && /bin/cp /<<PKGBUILDDIR>>/build/hotspot/variant-zero/libjvm/gtest/objs/test_align.o.log /<<PKGBUILDDIR>>/build/make-support/failure-logs/hotspot_variant-zero_libjvm_gtest_objs_test_align.o.log && /bin/cp /<<PKGBUILDDIR>>/build/hotspot/variant-zero/libjvm/gtest/objs/test_align.o.cmdline /<<PKGBUILDDIR>>/build/make-support/failure-logs/hotspot_variant-z...

[Pushkar Kulkarni (pushkarnk)]

I can confirm that I see these spurious crashes, but interestingly only in the googletest runs for hotspot, with the openjdk-lts, -17 and -21 builds for the January 2024 security updates.