> On 17-Oct-2023, at 4:35 PM, Lorenzo Stoakes <lstoakes@xxxxxxxxx> wrote: > > 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. Ah, thank you. Yes the fix works for me. - Sachin
