Re: armv7-on-aarch64 stuck at urdlck

On Jul 21, 2024, at 22:59, Michal Meloun <meloun.michal@gmail.com> wrote:

> I don't want to hijack the original thread, so I'm replying in a new one.
> 
> My tegra track current, has been running 24/7 by building kernel/world and kde5 in a loop for a few years now. But I have never encountered the aforementioned lockup in native armv7.
> 
> I have seen usermode mutex lockup in arm32 jail on aarch64, but only very rarely (once a month or so) and all my attempts to reproduce it in a more deterministic way have failed. Also, I don't think I've ever seen this with the debug version of libc.
> 
> Unfortunately I also failed to reproduce given lockup using dlopen_test.c, neither on native armv7 or arm32 jail.
> 
> Michal Meloun

What is the output of:

# readelf -a /libexec/ld-elf.so.1 | grep -E "(^[^ 0-9]|.*_rtld_get_stack_prot)"

in your armv7 context(s)? Does it include for likes of:

QUOTE
Symbol table '.symtab' contains 911 entries:
 903: 000000000001b9ac    16 FUNC    GLOBAL DEFAULT   11 _rtld_get_stack_prot
END QUOTE

vs. not?

Note that the "debug version of libc" being involved likely means that
DEBUG_FLAGS was defined. That in turn likely means that strip is not
being used. In such a case, I expect that the .symtab entry for
_rtld_get_stack_prot (and more) exists for such a context.


===
Mark Millard
marklmi at yahoo.com