On Thu, Jan 23, 2025 at 10:05 PM David Howells <dhowells@xxxxxxxxxx> wrote: > > Shyam Prasad N <nspmangalore@xxxxxxxxx> wrote: > > > I tried this again with 6.13-rc1 and the null-ptr deref seems to be > > slightly different (same function). > > Note that v6.13-rc1 doesn't include my patch. You need to be on v6.13-rc7 for > that. There are a number of other patches that went in too that might affect > what you're seeing. > > David > Hi David, Tried this on v6.13. Same effect. To reproduce (fairly consistently), I need to mount with an extra mount option of rasize=8388608. >> We're requesting reads of four folios, each consisting of 512 pages for a >> total of 8MiB. Based on your earlier analysis in this email thread, and based on my reading of the code it sounds like there should be a max of 4 folios in the folioq. >> netfs: R=00005a08[a] s=2600000-29fffff ctl=200000/400000/400000 sl=5 But based on the OOPS that I attached in my last email, slot number is 5, which explains why folio at that slot is NULL. I don't understand the donation logic well enough to understand why slot could have overflowed like this. Maybe you can? -- Regards, Shyam
