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15.21.0406.007; Tue, 15 Sep 2026 07:10:08 +0000 Message-ID: <38377447-ffa2-43ef-bbfa-43d05decda1e@windriver.com> Date: Tue, 15 Sep 2026 15:09:57 +0800 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH] xfs: fix NOFS state corruption in btree split worker To: Christoph Hellwig , Kefeng Wang Cc: brauner@kernel.org, djwong@kernel.org, cem@kernel.org, akpm@linux-foundation.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com, david@kernel.org, qi.zheng@linux.dev, shakeel.butt@linux.dev, ljs@kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org References: <20260902134417.c44503a1d65533f81fb1c391@linux-foundation.org> <20260903133756.2006032-1-wangkefeng.wang@huawei.com> Content-Language: en-US From: "Zhou, Yun" In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SL2P216CA0094.KORP216.PROD.OUTLOOK.COM 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definitions=main-2609150101 On 9/10/26 13:47, Christoph Hellwig wrote: > Adding Yun Zhou, whoch touched this area recently. > > On Thu, Sep 03, 2026 at 09:37:56PM +0800, Kefeng Wang wrote: >> xfs_btree_split_worker() calls xfs_trans_set_context() and >> xfs_trans_clear_context() on the caller's transaction, overwriting >> tp->t_pflags with the worker's NOFS state. When the caller already has >> PF_MEMALLOC_NOFS set (e.g. xfs_end_ioend_write, xfs_dio_write_end_io), >> the corrupted tp->t_pflags causes xfs_trans_free() to erroneously clear >> the caller's NOFS protection. >> >> Use memalloc_nofs_save/restore with a local variable instead so >> tp->t_pflags is never touched. > > Looks good: > > Reviewed-by: Christoph Hellwig > > Btw, if you have some spare time, it would be nice to kill > xfs_trans_set_context/xfs_trans_clear_context as follow up given that > they keep causing confusion. Yes, you finished reviewing this patch [1] in July. However, I'm not sure about its current status. Perhaps I should ping Carlos to check? [1] https://lore.kernel.org/all/20260720050522.3101824-1-yun.zhou@windriver.com/ Thanks, Yun