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bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le

From: Paul Eggert
Subject: bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le
Date: Sat, 27 Oct 2018 13:26:07 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

Wonderful. Yet another reason we need to get the pdumper branch working. Anyway:

1. Can you use strace and/or GDB to investigate how ./temacs is disabling address randomization? In the emacs-26 branch, if you run this command in src:

strace -f -o /tmp/tr ./temacs --batch  --load loadup bootstrap

the output file /tmp/tr should contain something like this:

18406 personality(0xffffffff)           = 0 (PER_LINUX)
18406 personality(PER_LINUX|ADDR_NO_RANDOMIZE) = 0 (PER_LINUX)
18406 personality(0xffffffff)           = 0x40000 (PER_LINUX|ADDR_NO_RANDOMIZE)
18406 execve("./temacs", ["./temacs", "--batch", "--load", "loadup", "bootstrap"], 0xc521b0 /* 80 vars */) = 0

and later on there should be one more call to 'personality', like this:

18406 personality(0xffffffff)           = 0x40000 (PER_LINUX|ADDR_NO_RANDOMIZE)

If it doesn't look like this, please investigate why, by using GDB.

2. What filesystem are you building in, and does it support xattrs? What is the output of the following in your build directory?

    touch x
    setfattr -n user.variable -v value x
    getfattr -n user.variable x

3. What is the output of "getfattr -d src/temacs"? It should be something like 

# file: src/temacs

If not, we need to figure out why not.

4. The output of 'make V=1' should contain something like the following. If not, please investigate why not.

setfattr -n user.pax.flags -v er temacs

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