Segfault - new ELF linker - debug

[mike-git374]

Zig Version

0.16.0-dev.1204+389368392

Steps to Reproduce and Observed Behavior

const std = @import("std");

pub fn main() !void {
   var d: std.heap.DebugAllocator(.{}) = .init;
   _ = try d.allocator().alloc(u8, 1);
}

zig build-exe -fnew-linker main.zig

./main
Segmentation fault at address 0x208fc0
aborting due to recursive panic

Executable from New linker gets a Segfault on this line 5074:

zig/lib/std/posix.zig

Lines 5071 to 5074 in 2f4bca4

	const elf_base = std.process.getBaseAddress();
	const ehdr: *elf.Ehdr = @ptrFromInt(elf_base);
	// Make sure the base address points to an ELF image.
	assert(mem.eql(u8, ehdr.e_ident[0..4], elf.MAGIC));

Old linker works fine: zig build-exe -fno-new-linker main.zig

This may be related to other issues like
#25328
#25421

Expected Behavior

No segfault

[jacobly0]

I'm not convinced that any of the many assumptions made by this code are necessary, and they pessimize the creation of incremental binaries, so this is currently intentionally broken under the assumption that the code can be fixed.