On Wed, May 22, 2024 at 2:37 AM Peter Xu <peterx@xxxxxxxxxx> wrote: > Hmm I still cannot reproduce. Weird. > > Would it be possible for you to identify which line in debug_vm_pgtable.c > triggered that issue? > > I think it should be some set_pte_at() but I'm not sure, as there aren't a > lot and all of them look benign so far. It could be that I missed > something important. I hope it's helps: > sh /usr/src/kernels/(uname -r)/scripts/faddr2line /lib/debug/lib/modules/(uname -r)/vmlinux debug_vm_pgtable+0x1c04 debug_vm_pgtable+0x1c04/0x3360: native_ptep_get_and_clear at arch/x86/include/asm/pgtable_64.h:94 (inlined by) ptep_get_and_clear at arch/x86/include/asm/pgtable.h:1262 (inlined by) ptep_clear at include/linux/pgtable.h:509 (inlined by) pte_clear_tests at mm/debug_vm_pgtable.c:643 (inlined by) debug_vm_pgtable at mm/debug_vm_pgtable.c:1392 > cat -n /usr/src/debug/kernel-6.9-10323-g8f6a15f095a6/linux-6.10.0-0.rc0.20240521git8f6a15f095a6.10.fc41.x86_64/mm/debug_vm_pgtable.c | sed -n '1387,1397 p' 1387 * Page table modifying tests. They need to hold 1388 * proper page table lock. 1389 */ 1390 1391 args.ptep = pte_offset_map_lock(args.mm, args.pmdp, args.vaddr, &ptl); 1392 pte_clear_tests(&args); 1393 pte_advanced_tests(&args); 1394 if (args.ptep) 1395 pte_unmap_unlock(args.ptep, ptl); 1396 1397 ptl = pmd_lock(args.mm, args.pmdp); -- Best Regards, Mike Gavrilov.
