What could be such a mistake?
strace -p 4623 strace: attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted 
kotdg kotdg
199 3 silver marks 15 bronze marks
- probably requires superuser privileges. run the program as root , or (if installed) the sudo program. - aleksandr barakin
- @alexanderbarakin, this is only one of the possible reasons, there may also be a) reattachment attempts, b) settings that affect exactly which process we are trying to trace. - 0andriy
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