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cjxeAtWFj8SDVgJudTqoADJOaUoZRwFonoBSkqQ7DjinohOcSvtBacjlyj8nsqh/fJJsid1dg8o wIrZTUkW/frgfL49nhjEXpsXYbqYJv1kCUImmoi2qMECV4YjujmYIxFE/dTXcGbCZJvRP0JuKyu 2nS5kbj2hZ57zVO4jIg== X-Proofpoint-ORIG-GUID: LKw6JUqaHnvSPPFW_sqOHdO0VKjdO_IE On Thu, Jan 01, 2026 at 05:33:11PM +0900, Jeongjun Park wrote: > #syz test upstream master > > --- > mm/mremap.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/mm/mremap.c b/mm/mremap.c > index 672264807db6..9d823ac8ebd3 100644 > --- a/mm/mremap.c > +++ b/mm/mremap.c > @@ -1604,6 +1604,9 @@ static bool vrm_move_only(struct vma_remap_struct *vrm) > if (!(vrm->flags & MREMAP_FIXED)) > return false; > > + if (vrm->flags & MREMAP_DONTUNMAP) > + return false; > + > if (vrm->old_len != vrm->new_len) > return false; > > -- How useful is this when it's a heisenbug that Harry can't repro, I can't repro and you repro'd just once I think? Unless syzbot happens to always hit this (I see one single report in the dashboard so presumably no), it'll potentially say any patch fixes it right? Also - this bug might already exist even without the move functionality - which should be equivalent to a series of mremap() calls, just done all at once for convenience. So this patch wouldn't necessarily fix the underlying problem, even if MREMAP_DONTUNMAP is the issue (the syzbot script is presumably relying on the batched move logic, but it doesn't mean that is necessary for this bug to be hit, it maybe alters timing?) Thanks, Lorenzo