On Thu, May 13, 2021 at 06:42:22PM +0900, Changheun Lee wrote: > > Problem might be casued by exhausting of memory. And memory exhausting > would be caused by setting of small bio_max_size. Actually it was not > reproduced in my VM environment at first. But, I reproduced same problem > when bio_max_size is set with 8KB forced. Too many bio allocation would > be occurred by setting of 8KB bio_max_size. Hmm... I'm not sure how to align your diagnosis with the symptoms in the bug report. If we were limited by memory, that should slow down the I/O, but we should still be making forward progress, no? And a forced reboot should not result in data corruption, unless maybe there was a missing check for a failed memory allocation, causing data to be written to the wrong location, a missing error check leading to the block or file system layer not noticing that a write had failed (although again, memory exhaustion should not lead to failed writes; it might slow us down, sure, but if writes are being failed, something is Badly Going Wrong --- things like writes to the swap device or writes by the page cleaner must succeed, or else Things Would Go Bad In A Hurry). - Ted
