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[Bug 1858046] Re: qemu-aarch64 hangs on cptofs during a build of NixOS S
[Bug 1858046] Re: qemu-aarch64 hangs on cptofs during a build of NixOS SD card image
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
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qemu-aarch64 hangs on cptofs during a build of NixOS SD card image
Status in QEMU:
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
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
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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