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+++ This bug was initially created as a clone of Bug #2034494 +++
LLVM currently hard-codes the size of struct pthread in the sanitizers, in ThreadDescriptorSize in compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp.
Starting with glibc 2.34 and this commit
commit fef400a2f976d1fd6a4639e6980f6c50ee13fbf5
Author: Florian Weimer <fweimer>
Date: Mon Jun 28 14:33:53 2021 +0200
nptl: Export libthread_db-used symbols under GLIBC_PRIVATE
This allows distributions to strip debugging information from
libc.so.6 without impacting the debugging experience.
Reviewed-by: Carlos O'Donell <carlos>
it is possible to determine sizeof (struct pthread) using dl(v)sym, like this:
const unsigned int *psize = dlvsym(RTLD_DEFAULT, "_thread_db_sizeof_pthread",
"GLIBC_PRIVATE");
if (psize != nullptr) {
val = *psize;
atomic_store_relaxed(&thread_descriptor_size, val);
return val;
}
I'm not sure if upstream will take this change, but we should definitely make it downstream, to avoid mysterious sanitizer problems if we need to change struct pthread in glibc.