On Tue, Oct 17, 2023 at 02:46:07PM +0530, Sachin Sant wrote: > While running LTP tests (getpid02) on a Power10 server booted with > 6.6.0-rc6-next-20231016 following crash was seen: > > [ 76.386628] Kernel attempted to read user page (d8) - exploit attempt? (uid: 0) > [ 76.386649] BUG: Kernel NULL pointer dereference on read at 0x000000d8 > [ 76.386653] Faulting instruction address: 0xc0000000004cda90 > [ 76.386658] Oops: Kernel access of bad area, sig: 11 [#1] [snip] > > Git bisect points to following patch > > commit 1db41d29b79ad271674081c752961edd064bbbac > mm: perform the mapping_map_writable() check after call_mmap() > > Reverting the patch allows the test to complete. > > - Sachin Hi Sachin, Thanks for the report but this was triggered in another test previously and has been fixed already (apologies for the inconvenience!) see [0]. Andrew took the -fix patch and applied to mm-unstable, this should wend its way to -next in the meantime. [0]:https://lore.kernel.org/all/c9eb4cc6-7db4-4c2b-838d-43a0b319a4f0@lucifer.local/
