Re: [Qemu-devel] [PATCH v3 00/32] Migration: postcopy failure recovery

[Peter Xu <peterx@redhat.com>]

On Mon, Oct 16, 2017 at 12:32:10AM -0700, no-reply@patchew.org wrote:
> Hi,
> 
> This series failed build test on s390x host. Please find the details below.
> 
> Type: series
> Subject: [Qemu-devel] [PATCH v3 00/32] Migration: postcopy failure recovery
> Message-id: 20171016065216.18162-1-peterx@redhat.com
> 
> === TEST SCRIPT BEGIN ===
> #!/bin/bash
> # Testing script will be invoked under the git checkout with
> # HEAD pointing to a commit that has the patches applied on top of "base"
> # branch
> set -e
> echo "=== ENV ==="
> env
> echo "=== PACKAGES ==="
> rpm -qa
> echo "=== TEST BEGIN ==="
> CC=$HOME/bin/cc
> INSTALL=$PWD/install
> BUILD=$PWD/build
> echo -n "Using CC: "
> realpath $CC
> mkdir -p $BUILD $INSTALL
> SRC=$PWD
> cd $BUILD
> $SRC/configure --cc=$CC --prefix=$INSTALL
> make -j4
> # XXX: we need reliable clean up
> # make check -j4 V=1
> make install
> === TEST SCRIPT END ===

[...]

>   CC      migration/postcopy-ram.o
>   CC      migration/qjson.o
>   CC      migration/block.o
>   CC      net/net.o
>   CC      net/queue.o
> /var/tmp/patchew-tester-tmp-nm4b3qpv/src/migration/postcopy-ram.c: In function ‘postcopy_ram_fault_thread’:
> /var/tmp/patchew-tester-tmp-nm4b3qpv/src/migration/postcopy-ram.c:553:13: error: ignoring return value of ‘read’, declared with attribute warn_unused_result [-Werror=unused-result]
>              read(mis->userfault_event_fd, &tmp64, 8);
>              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Need to capture read() return code.  Fixed.

I captured this as well using "make docker-test-build@fedora". Anyone
knows why I didn't encounter this on my Fedora 26 host?  My gcc
version: 7.2.1 20170915 (Red Hat 7.2.1-2), which seems to be quite new
as well.

Would also appreciate if anyone can provide a minimum docker test
subset (TEST & IMAGE) that I'd run before posting patches. TIA.

> cc1: all warnings being treated as errors
> /var/tmp/patchew-tester-tmp-nm4b3qpv/src/rules.mak:66: recipe for target 'migration/postcopy-ram.o' failed
> make: *** [migration/postcopy-ram.o] Error 1
> make: *** Waiting for unfinished jobs....
> === OUTPUT END ===
> 
> Test command exited with code: 2
> 
> 
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-- 
Peter Xu