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parca agent can not profile some user applications #3070

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@AshinZ

when i try to use parca-agent to collect profiling info in a linux machine, it can not profile some applications like my diy cpp program, which looks like a busy loop. In parca, i can just see some kernel info, how can i debug this?
BTF config is open.
version: parca-agent_0.39.1_Linux_x86_64.
kernel version: 5.10.112-005 centos7.
thanks.

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