* Juhyung Park <qkrwngud825@xxxxxxxxx> [230515 04:57]: > Hi Liam, > > It's a bit hard to follow this particular issue on v6.1 as there are many > email threads related to this. > > I just wanted to ask if whether this is fixed on mainline and v6.1 stable > yet. Not yet. It is in mm-unstable at this time. > > If there's a new thread tackling this issue, I'd appreciate it if you can > link it here. https://lore.kernel.org/linux-mm/20230505145829.74574-1-zhangpeng.00@xxxxxxxxxxxxx/ > > Thanks, > regards > > On 5/2/23 23:09, Liam R. Howlett wrote: > > ...Adding Rick to the Cc this time. > > > > * Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> [230502 10:08]: > > > * Michael Keyes <mgkeyes@xxxxxxxxxxxxxxxxxxxx> [230430 18:41]: > > > > On 29.04.23 15:32, Tad wrote: > > > > > This reintroduces the issue described in > > > > > https://lore.kernel.org/linux-mm/cb8dc31a-fef2-1d09-f133-e9f7b9f9e77a@xxxxxxxx/ > > > > Yes, I also ran into this (even though I'd somehow missed it the > > > > previous time). > > > > > > Rick Edgecombe reported something similar [1]. > > > > > > This is probably to do with my stack guard checks I recently added. > > > > > > > > > > > Apparently the issue arises at mm/mmap.c:1582, where low_limit is set to > > > > vm_end_gap(tmp). Occasionally, this returns a 64-bit address (e.g. > > > > 0x7fedea581000), which is obviously greater than high_limit for a 32-bit > > > > mmap, and causes the next call to mas_empty_area() to fail. > > > > > > > > I'm not sure why vm_end_gap(tmp) occasionally returns a 64-bit address, > > > > or if the best solution is to just check for this and skip the retry if > > > > it occurs… > > > > > > > > > > Thanks for the debugging. I will look into it. > > > > > > I am currently trying to revise how the iterators, prev/next deal with > > > shifting outside the requested limits. I suspect it's something to do > > > with hitting the limit and what someone would assume the next operation > > > means. > > > > > > [1] https://lore.kernel.org/linux-mm/32f156ba80010fd97dbaf0a0cdfc84366608624d.camel@xxxxxxxxx/ > > > >
