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After upgrade to 4.9.0-0.rc6.git2.1.fc26 on x86_64 and armv7hl I'm finding many times in kernel logs lines like [66523.177407] dnf (2286) used greatest stack depth: 4092 bytes left [88709.555128] dnf (2628) used greatest stack depth: 3908 bytes left [96827.069910] kworker/dying (6) used greatest stack depth: 3156 bytes left Also I have impression that general responsiveness desktop application is degraded. Just back to 4.9.0-0.rc5.git4.1.fc26 and seems speed is now better however even this version time to time as ell reports the same kernel issue. Just found in logs on 4.9.0-0.rc5.git4.1.fc26: [ 6964.284807] kworker/dying (633) used greatest stack depth: 9616 bytes left
That message is just informational. It does not indicate an problem with the kernel.
If it is not a bug why it is reported even as notification?
It's designed to track potential issues if a process is using a large amount of stack space.
So if such problem is reported in kworker/dying which is kernel thread it is something which should be reported as kernel bug. Isn't it?
No. It's not a problem. It's only reporting how much stack space is left. The feature that turns this on reports a message of the most amount of stack space used. The fact that a message is being reported does not mean the thread is in danger of running out of stack space, it's designed to give information that can be used later.