[Bug 215804] [xfstests generic/670] Unable to handle kernel paging request at virtual address fffffbffff000008

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https://bugzilla.kernel.org/show_bug.cgi?id=215804

--- Comment #8 from Zorro Lang (zlang@xxxxxxxxxx) ---
(In reply to Dave Chinner from comment #3)
> Hi Zorro,
> 
> On Tue, Apr 05, 2022 at 04:44:35AM +0000, bugzilla-daemon@xxxxxxxxxx wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=215804
> > 
> >             Bug ID: 215804
> >            Summary: [xfstests generic/670] Unable to handle kernel paging
> >                     request at virtual address fffffbffff000008
> >            Product: File System
> >            Version: 2.5
> >     Kernel Version: xfs-5.18-merge-4
> >           Hardware: All
> >                 OS: Linux
> >               Tree: Mainline
> >             Status: NEW
> >           Severity: normal
> >           Priority: P1
> >          Component: XFS
> >           Assignee: filesystem_xfs@xxxxxxxxxxxxxxxxxxxxxx
> >           Reporter: zlang@xxxxxxxxxx
> >         Regression: No
> > 
> > xfstests generic/670 hit a panic[1] on 64k directory block size XFS
> (mkfs.xfs
> > -n size=65536 -m rmapbt=1 -b size=1024):
> .....
> > [37285.246770] Call trace: 
> > [37285.246952]  __split_huge_pmd+0x1d8/0x34c 
> > [37285.247246]  split_huge_pmd_address+0x10c/0x1a0 
> > [37285.247577]  try_to_unmap_one+0xb64/0x125c 
> > [37285.247878]  rmap_walk_file+0x1dc/0x4b0 
> > [37285.248159]  try_to_unmap+0x134/0x16c 
> > [37285.248427]  split_huge_page_to_list+0x5ec/0xcbc 
> > [37285.248763]  truncate_inode_partial_folio+0x194/0x2ec 
> > [37285.249128]  truncate_inode_pages_range+0x2e8/0x870 
> > [37285.249483]  truncate_pagecache_range+0xa0/0xc0 
> 
> That doesn't look like an XFS regression, more likely a bug in the
> new large folios in the page cache feature. Can you revert commit
> 6795801366da ("xfs: Support large folios") and see if the problem
> goes away?

Hi Dave,

You're right, by reverting that patch this bug can't be reproduced anymore.

Thanks,
Zorro

> 
> Cheers,
> 
> Dave.

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