Large amount of futex syscalls (100% usage) when minting

[Demindiro]

Description

When unlocking my wallet for minting, I noticed that one of the threads uses 100% of the CPU. Using strace -f -p 30064 I get the following output:

[pid 30099] futex(0x74d16f08, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 30099] futex(0x74d16f08, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 30099] futex(0x74d16f08, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 30099] futex(0x74d16f08, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 30099] futex(0x74d16f08, FUTEX_WAKE_PRIVATE, 1) = 0
...

times a billion.

I've tried to use GDB to figure out what thread is doing:

• Frequently in __udivmoddi4
• Also quite often __pthread_mutex_unlock_usercnt
• Sometimes __offtime

Also some other functions but really not often.

I'll try to install a version with debug symbols to figure out what is going on.

---

System details

Distributor ID	Raspbian
Description	Raspbian GNU/Linux 9.8 (stretch)
Release	9.8
Codename	stretch
uname -a	Linux tunnel 4.14.79-v7+ #‍1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l GNU/Linux

[backpacker69]

what package are you using

[Demindiro]

raspbian-peercoind_0.7.3-1_armhf.deb

[backpacker69]

can you please try 0.8 rc9

[Demindiro]

It doesn't seem to be an issue in 0.8.