Hello,
[...]
Kernel: Linux 4.4.52-gnu (SMP w/4 CPU cores)
Where is this kernel from? I note the CPU you are using does not have an
FPU, so this could be a bug in the kernel FPU emulator. I can't remember
what fixes have gone in since 4.4 though.
This kernel is provided by the manufacturer of the board. I used this binary to update the firmware : https://github.com/gnubee-git/gnubee-git.github.io/blob/master/debian/librecmc-ramips-mt7621-gb-pc1-squashfs-sysupgrade_2017-07-22.bin. In normal operation, only the bootloader, kernel and initramfs are used. The initramfs pivots to a GNUBEE-ROOT partition if it finds one. The LibreCMC distribution is only used as a fallback.

cat /proc/version
Linux version 4.4.52-gnu (dgazineu@olimpo) (gcc version 5.4.0 (LEDE GCC 5.4.0 r20-646beea) ) #0 SMP Wed Jul 5 16:50:03 2017
According to https://wiki.openwrt.org/doc/howto/building_kernels_for_debian_binaries, it is quite possible that this kernel was not compiled with the FPU emulator at all. I will try to recompile the kernel with the FPU emulation and keep you informed.

Best regards,
Guillaume Perréal.

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