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Thu, 16 Apr 2026 05:12:49 -0700 (PDT) MIME-Version: 1.0 References: <898a4e10-6193-4671-b3b1-7c7bc562a671@fmap.me> In-Reply-To: From: Miklos Szeredi Date: Thu, 16 Apr 2026 14:12:37 +0200 X-Gm-Features: AQROBzBX4a19crGk_XkETxKLhmewGXqK0FtKuy_vUEQL4x7MLk1p9L_bODNm4ek Message-ID: Subject: Re: [fuse-devel] Debugging a stale kernel cache during file growth To: Matthew Wilcox Cc: Nikolay Amiantov , fuse-devel@lists.sourceforge.net, linux-fsdevel , Amir Goldstein , fuse-devel@lists.linux.dev, linux-mm Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: 8dfnbdfg96sz161jh9xsndi9176p5aen X-Rspam-User: X-Rspamd-Queue-Id: 2583F40015 X-Rspamd-Server: rspam05 X-HE-Tag: 1776341570-296191 X-HE-Meta: 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 hapyE3Bv wdxovhyCYujgrI6ubb5T/RsxqZUggeTtGTRN1yxEFF5nftOVsgmjnB0eny4xC4TbJzgecR1qj+dmS/lrsRR30ynHw+YZUmr9hbsK8axlWbQPf4TNKQCv/60pzQVSV/WxUvVpfuqxnKncIPLG58oKtSjujzyUGTtk9XWzlyAZ+1DAL8ysdNCGBWNBxfNyWsz+zQjZo+/cB7Q/4BeWqokkRVFwOCgX3G3braOxGBcH+8KivNTijuQg55swLFOk0YWbbBo+Z5raRkRjy/NE= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 16 Apr 2026 at 09:24, Amir Goldstein wrote: > > I've recently encountered a weird issue with JuiceFS [1], a network FS > > which uses FUSE. tl;dr: when a file was being slowly appended, a reader > > of the same file on another host would periodically read a block of zero > > bytes instead of the actual data. Thanks for the report. I wonder if we could clear PG_uptodate on the page which had its zero bytes exposed by the i_size increase? Willy? Thanks, Miklos