Ubuntu
linux package

  1. Bug #1690085
  2. Comment #145

Comment 145 for bug 1690085

Revision history for this message
In , malakudi (malakudi-linux-kernel-bugs) wrote :

Reverting the CONFIG_RCU_NOCB_CPU_{ALL|ZERO|NONE} options deletion is not a solution. This option is just a workaround for what I think is a hardware issue.

There is at least one Ryzen 1700X processor (friend of mine has it) that doesn't freeze on idle with stock kernel settings. Also, my original CPU that had segfault issues, didn't freeze on idle too. Actually, it seems most CPUs from RMA that don't have the segfault issue are more affected with the idle freeze issue than others.

AMD should be informed about the freeze on idle issue and an experienced kernel developer should work with them to find why a kernel with the rcuo kernel threads for RCU callback enabled hide the issue (or make it less probable to happen).