ACK: [SRU][J:azure][PATCH 0/1] azure: backport "netfs: Fix missing xas_retry() calls in xarray iteration"

[Manuel Diewald]

On Fri, Feb 14, 2025 at 07:38:21PM -0300, Vinicius Peixoto wrote:
> BugLink: https://bugs.launchpad.net/bugs/2098534
> 
> [Impact]
> 
> Microsoft has asked us to backport commit 7e043a80b5da ("netfs: Fix missing xas_retry() calls in xarray iteration") to the 5.15 Azure kernel.
> 
> [Fix]
> 
> Backported to the J:azure tree.
> 
> [Test plan]
> 
> Build tested only; Microsoft will test the bug fix.
> 
> [Where problems could occur]
> 
> Due to the significant delta between the Jammy 5.15 tree and commit 7e043a80b5da, particularly w.r.t. fs/netfs/read_helper.c, that got split into multiple files in 5.17, as well as the change that introduced the usage of folios in netfslib, a manual backported was required. The changes, however, were relatively simple/self-contained, and as such this presents a medium regression risk. Any issues with this patch could manifest as either a null pointer dereference in netfs_rreq_unlock/netfs_rreq_unmark_after_write, or potentially as a hung thread when doing a lot of I/O on an netfs filesystem.
> 
> David Howells (1):
>   netfs: Fix missing xas_retry() calls in xarray iteration
> 
>  fs/netfs/read_helper.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> -- 
> 2.43.0
> 
> 
> -- 
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
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Acked-by: Manuel Diewald <manuel.diewald at canonical.com>

-- 
 Manuel
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