Debugging segmentation faults in the JVM on linux-powerpc

[John Paul Adrian Glaubitz]

On 06/10/2017 07:09 PM, John Paul Adrian Glaubitz wrote:
> On 06/09/2017 08:57 PM, John Paul Adrian Glaubitz wrote:
>> It's still building, let's see if it actually succeeds.
> 
> It does. And it fails again with "--with-debug-level=fastdebug":

And here's the backtrace:

(sid-powerpc-sbuild)root at kapitsa:/build/openjdk-9-fz188x/openjdk-9-9~b170# gdb --args /build/openjdk-9-fz188x/openjdk-9-9~b170/build/jdk/bin/jmod
-J-XX:+UseSerialGC -J-Xms32M -J-Xmx512M -J-XX:TieredStopAtLevel=1 create --module-version 9-Debian --target-platform 'linux-ppc' --module-path
/build/openjdk-9-fz188x/openjdk-9-9~b170/build/images/jmods --exclude '**{_the.*,_*.marker,*.diz,*.debuginfo,*.dSYM/**,*.dSYM,*.pdb,*.map}' --libs
/build/openjdk-9-fz188x/openjdk-9-9~b170/build/support/modules_libs/java.management --class-path
/build/openjdk-9-fz188x/openjdk-9-9~b170/build/jdk/modules/java.management --legal-notices
"/build/openjdk-9-fz188x/openjdk-9-9~b170/build/support/modules_legal/java.base" /build/openjdk-9-fz188x/openjdk-9-9~b170/build/support/jmods/java.management.jmod
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Reading symbols from /build/openjdk-9-fz188x/openjdk-9-9~b170/build/jdk/bin/jmod...Reading symbols from
/build/openjdk-9-fz188x/openjdk-9-9~b170/build/jdk/bin/jmod.debuginfo...done.
done.
(gdb) r
Starting program: /build/openjdk-9-fz188x/openjdk-9-9~b170/build/jdk/bin/jmod -J-XX:+UseSerialGC -J-Xms32M -J-Xmx512M -J-XX:TieredStopAtLevel=1 create
--module-version 9-Debian --target-platform linux-ppc --module-path /build/openjdk-9-fz188x/openjdk-9-9\~b170/build/images/jmods --exclude
\*\*\{_the.\*,_\*.marker,\*.diz,\*.debuginfo,\*.dSYM/\*\*,\*.dSYM,\*.pdb,\*.map\} --libs
/build/openjdk-9-fz188x/openjdk-9-9\~b170/build/support/modules_libs/java.management --class-path
/build/openjdk-9-fz188x/openjdk-9-9\~b170/build/jdk/modules/java.management --legal-notices
/build/openjdk-9-fz188x/openjdk-9-9\~b170/build/support/modules_legal/java.base /build/openjdk-9-fz188x/openjdk-9-9\~b170/build/support/jmods/java.management.jmod
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/powerpc-linux-gnu/libthread_db.so.1".
[New Thread 0xf7f9f460 (LWP 19187)]

Thread 2 "jmod" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xf7f9f460 (LWP 19187)]
StubGenerator::SafeFetch32 (adr=0xabc, errValue=2748) at ./src/hotspot/src/cpu/zero/vm/stubGenerator_zero.cpp:211
211         value = *adr;
(gdb) bt
#0  StubGenerator::SafeFetch32 (adr=0xabc, errValue=2748) at ./src/hotspot/src/cpu/zero/vm/stubGenerator_zero.cpp:211
#1  0x0f9c6c0c in SafeFetch32 (errValue=2748, adr=0xabc) at ./src/hotspot/src/share/vm/runtime/stubRoutines.hpp:464
#2  test_safefetch32 () at ./src/hotspot/src/share/vm/runtime/stubRoutines.cpp:243
#3  StubRoutines::initialize2 () at ./src/hotspot/src/share/vm/runtime/stubRoutines.cpp:364
#4  0x0f9c7544 in stubRoutines_init2 () at ./src/hotspot/src/share/vm/runtime/stubRoutines.cpp:373
#5  0x0f4f04a0 in init_globals () at ./src/hotspot/src/share/vm/runtime/init.cpp:143
#6  0x0fa115e8 in Threads::create_vm (args=args at entry=0xf7f9ed3c, canTryAgain=canTryAgain at entry=0xf7f9ecd0) at ./src/hotspot/src/share/vm/runtime/thread.cpp:3630
#7  0x0f56da68 in JNI_CreateJavaVM_inner (args=0xf7f9ed3c, penv=0xf7f9ed38, vm=0xf7f9ed34) at ./src/hotspot/src/share/vm/prims/jni.cpp:3937
#8  JNI_CreateJavaVM (vm=vm at entry=0xf7f9ed34, penv=penv at entry=0xf7f9ed38, args=args at entry=0xf7f9ed3c) at ./src/hotspot/src/share/vm/prims/jni.cpp:4032
#9  0x0ff244cc in InitializeJVM (ifn=<synthetic pointer>, penv=0xf7f9ed38, pvm=0xf7f9ed34) at ./src/jdk/src/java.base/share/native/libjli/java.c:1481
#10 JavaMain (_args=<optimized out>) at ./src/jdk/src/java.base/share/native/libjli/java.c:408
#11 0x0ff28aa0 in call_continuation (_args=<optimized out>) at ./src/jdk/src/java.base/unix/native/libjli/java_md_solinux.c:895
#12 0x0ff67500 in start_thread () from /lib/powerpc-linux-gnu/libpthread.so.0
#13 0x0fe239b0 in clone () from /lib/powerpc-linux-gnu/libc.so.6
(gdb)

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913