Hi all, On Mon, 14 Sep 2020 12:55:59 +0100 Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > > On Mon, Sep 14, 2020 at 03:49:43PM +0530, Naresh Kamboju wrote: > > While running LTP fs on qemu x86 and qemu_i386 these kernel BUGs noticed. > > I actually sent the fix for this a couple of days ago [1], but I think Andrew > overlooked it while constructing the -mm tree. Here's a fix you can > apply to the -mm tree: > > [1] https://lore.kernel.org/linux-mm/20200912032042.GA6583@xxxxxxxxxxxxxxxxxxxx/ > > diff --git a/mm/shmem.c b/mm/shmem.c > index d2a46ef7df43..58bc9e326d0d 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -1793,7 +1793,7 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, > struct mm_struct *charge_mm; > struct page *page; > enum sgp_type sgp_huge = sgp; > - pgoff_t hindex; > + pgoff_t hindex = index; > int error; > int once = 0; > int alloced = 0; > @@ -1822,6 +1822,8 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, > return error; > } > > + if (page) > + hindex = page->index; > if (page && sgp == SGP_WRITE) > mark_page_accessed(page); > > @@ -1832,6 +1834,7 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, > unlock_page(page); > put_page(page); > page = NULL; > + hindex = index; > } > if (page || sgp == SGP_READ) > goto out; > @@ -1982,7 +1985,7 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, > goto unlock; > } > out: > - *pagep = page + index - page->index; > + *pagep = page + index - hindex; > return 0; > > /* I have applied that to linux-next today. -- Cheers, Stephen Rothwell
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