On Tue, 4 Mar 2025, Zi Yan wrote:
On 4 Mar 2025, at 6:49, Hugh Dickins wrote:
I'd been unable to complete even a single iteration of my "kernel builds on huge tmpfs while swapping to SSD" testing during this current 6.14-rc mm.git cycle (6.14-rc itself fine) - until the last week, when some important fixes have come in, so I'm no longer getting I/O errors from ext4-on-loop0-on-huge-tmpfs, and "Huh VM_FAULT_OOM leaked" warnings: good.
This error should be related to the other patch I sent out on using xas_try_split() in shmem_large_entry_split(). Great to have you confirm it fixed some of the bugs.
But I still can't get beyond a few iterations, a few minutes: there's some corruption of user data, which usually manifests as a kernel build failing because fixdep couldn't find some truncated-on-the-left pathname.
It is likely that this patch might fix it (partially): https://lore.kernel.org/linux-mm/56EBE3B6-99EA-470E-B2B3-92C9C13032DF@nvidia.... Andrew has picked it yesterday.
No, that's a fix to a truncation issue which I had not hit: I did try adding that patch, but it has not helped in my case.
Beyond checking that, I didn't have time yesterday to investigate further, but I'll try again today (still using last weekend's mm.git).
Hugh