Broken 32-bit riscv debug build with ZSTD and FTRACE

[Marco Bonelli]

I was able to also reproduce without ZSTD (i.e. both ZSTD_COMPRESS=n
and ZSTD_DECOMPRESS=n) like this:

	export ARCH=riscv CROSS_COMPILE=riscv32-linux-
	make distclean
	make defconfig
	make 32-bit.config
	./scripts/config \
		-e FTRACE \
		-e CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT \
		-d RD_ZSTD \
		-d SECURITY_APPARMOR_INTROSPECT_POLICY \
		-d BTRFS_FS
	make olddefconfig
	make -j vmlinux

Did another bisect run between v6.14 and v6.15 with the above commands
in a bash script and got:

	494e7fe591bf834d57c6607cdc26ab8873708aa7 Merge tag 'bpf_res_spin_lock' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

This leaves me more puzzled than before honestly. Not sure whether it is
a real bug or a problem on my end at this point? The fact that I can repro
in a Docker makes me think of the former, but the fact that I was able to
bisect it down to two different commits depending on ZSTD vs no ZSTD is
weird.

Alex (or anyone else really): are you able to reproduce with my Dockerfile
or config I provided in my last mail by any chance?

--
Marco Bonelli