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[Bug 1858046] Re: qemu-aarch64 hangs on cptofs during a build of NixOS S

From: Ryan Lahfa
Subject: [Bug 1858046] Re: qemu-aarch64 hangs on cptofs during a build of NixOS SD card image
Date: Thu, 02 Jan 2020 15:40:52 -0000

Update: compiling qemu upstream & using the latest version didn't change

I don't know if this is an instance of user emulation limitations due to 
missing syscalls.

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  qemu-aarch64 hangs on cptofs during a build of NixOS SD card image

Status in QEMU:

Bug description:
  First, thank you for this incredible project.

  While following this guide to build my own image of NixOS:
  https://nixos.wiki/wiki/NixOS_on_ARM#Compiling_through_QEMU on ARM

  I encountered a very strange behavior, qemu is correctly used and
  build most of the binaries until it executes this exact line over
  qemu: https://github.com/NixOS/nixpkgs/blob/master/nixos/lib/make-

  At this step, the qemu process goes to 100 % of CPU, hangs in a
  certain syscall I don't know which one (according to strace & gdb
  which has no symbols so breaking and looking the backtrace was

  According to iotop, no I/O was done.

  And it spent all its time in this syscall during more than 10 hours,
  which looks anomalous to me.

  I attach some of my CPU info:

  model         : 142
  model name    : Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
  stepping      : 10
  microcode     : 0x96
  cpu MHz               : 3107.071
  cache size    : 8192 KB

  I'm using a ThinkPad T480 to perform those builds, I'm uncertain of
  how to debug further this issue, I discussed this with some people
  over #nixos-aarch64 and they told me they didn't know how to debug it
  further too.

  I tried all with this package: https://aur.archlinux.org/packages
  /qemu-arm-static/ — I'm currently compiling qemu-git to see if it
  happens on upstream too. Will comment when it's done.

  Thank you in advance!

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