As root, I try to attach strace
to a running kworker
process, without success.
root@rasal# whoami
root
root@rasal:/# cat /proc/sys/kernel/yama/ptrace_scope
0
root@rasal:/# ps ax | grep kworker
1030 ? S< 0:00 [kworker/u17:0]
root@rasal:/# strace -fp 1030
strace: attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted
Could not attach to process. If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
The etc/sysctl.d/10-ptrace.conf
file simply states:
A PTRACE scope of "0" is the more permissive mode.
This is exactly what I have, see above. Is there any reason why this should fail? Or is this a bug?