Re: Non-zero build crash on kernel 5.17+?

Fri Sep 23 11:16:28 UTC 2022

Hi Zixian,
The current backend supports sv48 and below only. Please see [1] for more details.
The kernel 5.17 supports sv48 and 5.18 supports sv57. Your address `0xfffffff71136b8` is a 56-bit address, which is not supported by the backend currently.
To bypass this issue, you can try to use kernel 5.17 directly or find if there are options for QEMU to limit the address space to an sv48 one.
Not sure if there will be support for a larger address space recently in the backend, for there seems no hardware supporting even sv48 now.
Thanks,
Xiaolin
[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/macroAssembler_riscv.hpp#L910-L914 <https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/macroAssembler_riscv.hpp#L910-L914 >
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From:Zixian Cai <zixian.cai at anu.edu.au>
Send Time:2022年9月23日(星期五) 16:57
To:riscv-port-dev at openjdk.org <riscv-port-dev at openjdk.org>
Subject:Non-zero build crash on kernel 5.17+?
Hi all,
I found that a non-zero build of jdk-20+16 crashes on Ubuntu 22.10 (kernel 5.19) running on QEMU.
The same build works on Ubuntu 22.04 (kernel 5.15) running on QEMU.
The error message is as follows.
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/assembler_riscv.cpp:285
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/cpu/riscv/assembler_riscv.cpp:285), pid=907, tid=908
# assert(is_unsigned_imm_in_range(imm64, 47, 0) || (imm64 == (int64_t)-1)) failed: bit 47 overflows in address constant
#
# JRE version: (20.0) (slowdebug build )
# Java VM: OpenJDK 64-Bit Server VM (slowdebug 20-testing-builds.shipilev.net-openjdk-jdk-b212-20220922, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-riscv64)
# Problematic frame:
# V [libjvm.so+0x39f41c] Assembler::movptr_with_offset(Register, unsigned char*, int&)+0x96
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport -p%p -s%s -c%c -d%d -P%P -u%u -g%g -- %E" (or dumping to /home/ubuntu/core.907)
#
# An error report file with more information is saved as:
# /home/ubuntu/hs_err_pid907.log
#
#
Here is the backtrace and local variables seen in gdb.
(gdb) bt
#0 0x00fffffff674941c in Assembler::movptr_with_offset (this=0xfffffff0000e30, Rd=...,
 addr=0xfffffff71136b8 <SharedRuntime::exception_handler_for_return_address(JavaThread*, unsigned char*)> "9q\006\374\"\370", <incomplete sequence \364\200>, offset=@0xfffffff632f00c: 0)
 at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/cpu/riscv/assembler_riscv.cpp:284
#1 0x00fffffff6f17c5c in MacroAssembler::call_VM_leaf_base (this=0xfffffff0000e30,
 entry_point=0xfffffff71136b8 <SharedRuntime::exception_handler_for_return_address(JavaThread*, unsigned char*)> "9q\006\374\"\370", <incomplete sequence \364\200>, number_of_arguments=2,
 retaddr=0x0) at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/cpu/riscv/macroAssembler_riscv.cpp:568
#2 0x00fffffff6f17da2 in MacroAssembler::call_VM_leaf (this=0xfffffff0000e30,
 entry_point=0xfffffff71136b8 <SharedRuntime::exception_handler_for_return_address(JavaThread*, unsigned char*)> "9q\006\374\"\370", <incomplete sequence \364\200>, arg_0=..., arg_1=...)
 at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/cpu/riscv/macroAssembler_riscv.cpp:588
#3 0x00fffffff7222308 in StubGenerator::generate_forward_exception (this=0xfffffff632f1e8) at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/cpu/riscv/stubGenerator_riscv.cpp:546
#4 0x00fffffff7231506 in StubGenerator::generate_initial (this=0xfffffff632f1e8) at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/cpu/riscv/stubGenerator_riscv.cpp:3870
#5 0x00fffffff7231956 in StubGenerator::StubGenerator (this=0xfffffff632f1e8, code=0xfffffff632f3c8, phase=0)
 at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/cpu/riscv/stubGenerator_riscv.cpp:3971
#6 0x00fffffff721faa0 in StubGenerator_generate (code=0xfffffff632f3c8, phase=0) at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/cpu/riscv/stubGenerator_riscv.cpp:3988
#7 0x00fffffff72322c8 in StubRoutines::initialize1 () at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/share/runtime/stubRoutines.cpp:228
#8 0x00fffffff72330d2 in stubRoutines_init1 () at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/share/runtime/stubRoutines.cpp:389
#9 0x00fffffff6c7823a in init_globals () at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/share/runtime/init.cpp:123
#10 0x00fffffff72bcc34 in Threads::create_vm (args=0xfffffff632f7e0, canTryAgain=0xfffffff632f70b) at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/share/runtime/threads.cpp:570
#11 0x00fffffff6d891ae in JNI_CreateJavaVM_inner (vm=0xfffffff632f838, penv=0xfffffff632f840, args=0xfffffff632f7e0)
 at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/share/prims/jni.cpp:3628
#12 0x00fffffff6d893a8 in JNI_CreateJavaVM (vm=0xfffffff632f838, penv=0xfffffff632f840, args=0xfffffff632f7e0) at /home/buildbot/worker/build-jdkX-debian10/build/src/hotspot/share/prims/jni.cpp:3714
#13 0x00fffffff7fb1a44 in InitializeJVM (pvm=0xfffffff632f838, penv=0xfffffff632f840, ifn=0xfffffff632f890)
 at /home/buildbot/worker/build-jdkX-debian10/build/src/java.base/share/native/libjli/java.c:1457
#14 0x00fffffff7faef16 in JavaMain (_args=0xffffffffffc0d8) at /home/buildbot/worker/build-jdkX-debian10/build/src/java.base/share/native/libjli/java.c:413
#15 0x00fffffff7fb50ea in ThreadJavaMain (args=0xffffffffffc0d8) at /home/buildbot/worker/build-jdkX-debian10/build/src/java.base/unix/native/libjli/java_md.c:650
#16 0x00fffffff7ed7450 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#17 0x00fffffff7f24ed2 in __thread_start () at ../sysdeps/unix/sysv/linux/riscv/clone.S:85
(gdb) info locals
imm64 = 0xfffffff71136b8
imm = 0xfffffff632efb0
upper = 0xfffffff632efb0
lower = 0xffffff80000000
I suspect that the issue is due to the newer kernels (5.17+) supports sv48, and that increases the bits in the addresses that the assembler needs to handle. See kernel changelog https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17 <https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17 >.
To reproduce the issue, I use the following.
Guest Ubuntu 22.10:  https://cdimage.ubuntu.com/ubuntu-server/daily-preinstalled/current/kinetic-preinstalled-server-riscv64+unmatched.img.xz <https://cdimage.ubuntu.com/ubuntu-server/daily-preinstalled/current/kinetic-preinstalled-server-riscv64+unmatched.img.xz >
Guest Ubuntu 22.04:  https://cdimage.ubuntu.com/releases/22.04.1/release/ubuntu-22.04.1-preinstalled-server-riscv64+unmatched.img.xz <https://cdimage.ubuntu.com/releases/22.04.1/release/ubuntu-22.04.1-preinstalled-server-riscv64+unmatched.img.xz >
JDK slowdebug build:  https://builds.shipilev.net/openjdk-jdk/openjdk-jdk-linux-riscv64-server-slowdebug-gcc8-glibc2.28.tar.xz <https://builds.shipilev.net/openjdk-jdk/openjdk-jdk-linux-riscv64-server-slowdebug-gcc8-glibc2.28.tar.xz > (OpenJDK 64-Bit Server VM (slowdebug build 20-testing-builds.shipilev.net-openjdk-jdk-b212-20220922, mixed mode))
QEMU: installed via apt on Ubuntu 22.04 host
QEMU setup:  https://wiki.ubuntu.com/RISC-V <https://wiki.ubuntu.com/RISC-V >
Sincerely,
Zixian
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