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Thanks. I've edited the title and original post to be a little more clear. It's the nanosleep() system call that processes are getting stuck in. We've found this by running `strace` on processes and found nanosleep() is the last system call they make before getting indefinitely blocked. As for...

Hey all. I have an embedded board with a quad core A53 ARM that's running kernel 5.4.74. We build the kernel our self, and we have it patched with the latest 5.4.74 rt42 patches from here (https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/5.4/older/). We have an instability in our...