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[209.85.218.53]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-61cfc22dfa1sm15020091a12.22.2025.09.04.16.36.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 Sep 2025 16:36:50 -0700 (PDT) Received: by mail-ej1-f53.google.com with SMTP id a640c23a62f3a-afcb7ace3baso294355966b.3; Thu, 04 Sep 2025 16:36:50 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCXYFf/JVwPiD1tOlsB1gVvBBtUUf0cpH9wRyB4qnqmwAc5wH63PBM+PZV01F3rco5OD/P2HNh8m4wQ1@freebsd.org X-Received: by 2002:a17:907:7293:b0:b04:568b:8a42 with SMTP id a640c23a62f3a-b04568b947dmr1017296966b.29.1757029010247; Thu, 04 Sep 2025 16:36:50 -0700 (PDT) List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@FreeBSD.org MIME-Version: 1.0 From: obiwac Date: Fri, 5 Sep 2025 01:36:39 +0200 X-Gmail-Original-Message-ID: X-Gm-Features: Ac12FXxCyWO_wjSOYygKYXCh1eDf1FlsBD4fDegjIQlqM5-gyRXTz3ZaOkUg2tI Message-ID: Subject: Fuse issue with attr caching expecting write lock To: freebsd-current@freebsd.org, freebsd-fs@freebsd.org Cc: alan.somers@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Spamd-Bar: -- X-Spamd-Result: default: False [-2.73 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.97)[-0.965]; NEURAL_HAM_MEDIUM(-0.86)[-0.862]; FORGED_SENDER(0.30)[obiwac@freebsd.org,obiwac@gmail.com]; R_SPF_ALLOW(-0.20)[+ip4:209.85.128.0/17:c]; MIME_GOOD(-0.10)[text/plain]; DMARC_POLICY_SOFTFAIL(0.10)[freebsd.org : SPF not aligned (relaxed), No valid DKIM,none]; RCVD_TLS_LAST(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; RCVD_COUNT_THREE(0.00)[3]; ARC_NA(0.00)[]; MISSING_XM_UA(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_HAS_DN(0.00)[]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US]; FREEMAIL_ENVFROM(0.00)[gmail.com]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_NONE(0.00)[]; FROM_NEQ_ENVFROM(0.00)[obiwac@freebsd.org,obiwac@gmail.com]; FREEFALL_USER(0.00)[obiwac]; MLMMJ_DEST(0.00)[freebsd-current@freebsd.org,freebsd-fs@freebsd.org]; RWL_MAILSPIKE_POSSIBLE(0.00)[209.85.208.45:from]; R_DKIM_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[209.85.208.45:from,209.85.218.53:received] X-Rspamd-Queue-Id: 4cHwqS3w8Cz42jQ Hi! When trying to access a large file with sshfs (on fuse), I get a kernel panic because fuse_internal_cache_attrs is asserting a write lock when it is sometimes being called from fuse_internal_do_getattr, which only asserts a read lock. To me (i.e. someone who has never touched VFS or fuse code) this code looks wrong, and fuse_internal_do_getattr should be acquiring a write lock around its call to fuse_internal_cache_attrs, but clearly it has been working just fine for a while now as this code hasn't changed super recently so I could be missing something. Thanks, Aymeric