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

[bugzilla-daemon@kernel.org]

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

--- Comment #3 from Dave Chinner (david@fromorbit.com) ---
Hi Zorro,

On Tue, Apr 05, 2022 at 04:44:35AM +0000, bugzilla-daemon@kernel.org 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@kernel-bugs.kernel.org
>           Reporter: zlang@redhat.com
>         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?

Cheers,

Dave.

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