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qemu-arm-static stuck with 100% CPU when cross-compiling emacs
Hello,
I'm trying to build multi-arch docker images for https://hub.docker.com/r/silex/emacs.
Here is the machine I'm building on:
root@ubuntu-4gb-fsn1-1:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic
root@ubuntu-4gb-fsn1-1:~# uname -a
Linux ubuntu-4gb-fsn1-1 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Whenever I try to build the following alpine Dockerfile https://gitlab.com/Silex777/docker-emacs/blob/master/26.3/alpine/3.9/dev/Dockerfile with this command:
$ docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
$ docker build --pull -t test --platform arm .
It builds fine until this:
root@ubuntu-4gb-fsn1-1:~# ps -ef | grep qemu
root 26473 26465 99 14:26 pts/0 01:59:58 /usr/bin/qemu-arm-static ../src/bootstrap-emacs -batch --no-site-file --no-site-lisp --eval (setq load-prefer-newer t) -f batch-byte-compile emacs-lisp/macroexp.el
This is supposed to take a few seconds, but in practice it takes 100% CPU and never ends. When I strace the process I see this:
getdents64(5, /* 0 entries */, 2048) = 0
lseek(5, 0, SEEK_SET) = 0
getdents64(5, /* 5 entries */, 2048) = 120
tgkill(5875, 5878, SIGRT_2) = -1 EAGAIN (Resource temporarily unavailable)
getdents64(5, /* 0 entries */, 2048) = 0
lseek(5, 0, SEEK_SET) = 0
getdents64(5, /* 5 entries */, 2048) = 120
tgkill(5875, 5878, SIGRT_2) = -1 EAGAIN (Resource temporarily unavailable)
getdents64(5, /* 0 entries */, 2048) = 0
lseek(5, 0, SEEK_SET) = 0
getdents64(5, /* 5 entries */, 2048) = 120
tgkill(5875, 5878, SIGRT_2) = -1 EAGAIN (Resource temporarily unavailable)
getdents64(5, /* 0 entries */, 2048) = 0
lseek(5, 0, SEEK_SET) = 0
getdents64(5, /* 5 entries */, 2048) = 120
tgkill(5875, 5878, SIGRT_2) = -1 EAGAIN (Resource temporarily unavailable)
getdents64(5, /* 0 entries */, 2048) = 0
lseek(5, 0, SEEK_SET) = 0
getdents64(5, /* 5 entries */, 2048) = 120
tgkill(5875, 5878, SIGRT_2) = -1 EAGAIN (Resource temporarily unavailable)
It happens with all the QEMU versions I tested:
- 2.11.1 (OS version)
- 4.1.1-1 (from multiarch/qemu-user-static:4.1.1-1)
- 4.2.0-2 (from multiarch/qemu-user-static)
Any ideas of what I could do to debug it further?
Kind regards,
Philippe
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