From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Christoph Berg <myon(at)debian(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Andres Freund <andres(at)anarazel(dot)de> |
Subject: | Re: gs_group_1 crashing on 13beta2/s390x |
Date: | 2020-10-14 21:58:35 |
Message-ID: | 20201014215835.xqllzcbj6yulvexa@alap3.anarazel.de |
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Lists: | pgsql-hackers |
Hi,
Christoph helped me to get access to a s390x machine - I wasn't able to
reproduce exactly the error he hit. Initially all tests passed, but
after recompiling with build flags more similar to Christop's I was able
to hit another instance of what I assume to be the same bug.
I am fairly sure that I see the problem. Before a post LLVM 10 change
the "runtime linker" for JITed code only asserted that relocations that
need to be performed are of a known type. Since the debian build -
correctly - uses a release version of LLVM, this results in unhandled
relocations basically being resolved to 0.
I suspect that building with LDFLAGS="-Wl,-z,relro -Wl,-z,now" - which
is what I think the debian package does - creates the types of
relocations that LLVM doesn't handle for elf + s390.
10 release branch:
void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section,
uint64_t Offset, uint64_t Value,
uint32_t Type, int64_t Addend) {
uint8_t *LocalAddress = Section.getAddressWithOffset(Offset);
switch (Type) {
default:
llvm_unreachable("Relocation type not implemented yet!");
break;
11/master:
void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section,
uint64_t Offset, uint64_t Value,
uint32_t Type, int64_t Addend) {
uint8_t *LocalAddress = Section.getAddressWithOffset(Offset);
switch (Type) {
default:
report_fatal_error("Relocation type not implemented yet!");
break;
Verifying that that's the case by rebuilding against 11 (and then an
LLVM debug build, which will take a day or two).
Greetings,
Andres Freund
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