I’m looking at this syzkaller report: https://groups.google.com/g/syzkaller-bugs/c/FvPFh7-dtx4/m/7Yoy6KSkAAAJ?pli=1

It finds a crash caused by some commit.
After submitting some patches, syzkaller finds that a particular patch fixes the crash.

Here is the patch. It does not touch anything except forcing CONFIG_XARRAY_MULTI:

--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -279,6 +279,7 @@ endif # HUGETLBFS
 
  config HUGETLB_PAGE
  def_bool HUGETLBFS
+ select XARRAY_MULTI

  config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
  def_bool HUGETLB_PAGE

However looking at the initial config https://syzkaller.appspot.com/x/.config?x=bb39fe85d254f638 the CONFIG_XARRAY_MULTI was enabled anyway (and the configs used originally and with the fix are identical).

Does this mean that the patch is falsely detected as a working fix?
Or is it a reporting bug, and Syzkaller actually used different configs than reported?