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AJvYcCUktoSOTnbnmObjc5F3zBkKXNwnBoES/98eRLHhMiB0zf4u97XAtvEDfyuJQjnV/mw9sON7LZGZdA==@kvack.org X-Gm-Message-State: AOJu0Yzxrxx0Q8XABNe9pmveDLEqcg7wEmA1RX06RrBB6PLJ+VsOZ2q/ e1cFqMtY5OTJqqvK8EMxiewOMqlMO0k7AarCJz93CKVNRr8L9X9uRoDOA6FqHcvq5xR2iRyXlq0 WiYfiUDu0izRYEJ2uWoFivElrkWgdR/FHjTy6MeRnug== X-Gm-Gg: ASbGnctot9Y36gLF2EUwfTQLdObVYUZwKYXZ8f82Hib9GFR8j1q2AwKX7YFp26ucsRL Uhpst53UDihygyebU95+tZyrEQfL0+boPBhV+x2YAH32vAreFk897RHWry4K7RfdtRnOWPh8K/t /ibxx0cAVJUcJgG4Sk3gY+ACJ+1xxLfxXZqPUhix5AVHHvinODLKeF7XZh9ioS1TUzDH7IFYGV/ ubt/OZUt/IV+JtPprHEoylk+JVNbk4vL3+yzlV85ZL6DZTxVjV9g08= X-Google-Smtp-Source: AGHT+IFx0UdBWSFzYZQCS0rHKafbSNkZSpgCULmd3CeOoP1qT5yHjsnFa6vko92RxDrAUE/s9j8jFsO1c8h9Tuwiqu4= X-Received: by 2002:a17:907:3f20:b0:b04:6858:13ce with SMTP id a640c23a62f3a-b1bbd49ad36mr433982366b.38.1758143975487; Wed, 17 Sep 2025 14:19:35 -0700 (PDT) MIME-Version: 1.0 References: <4z3imll6zbzwqcyfl225xn3rc4mev6ppjnx5itmvznj2yormug@utk6twdablj3> <20250917201408.GX39973@ZenIV> <20250917203435.GA39973@ZenIV> <20250917211009.GE39973@ZenIV> In-Reply-To: <20250917211009.GE39973@ZenIV> From: Max Kellermann Date: Wed, 17 Sep 2025 23:19:23 +0200 X-Gm-Features: AS18NWBuDJyrihrXYWVEdB4-Fs__rxwIrvhTfFiInfF4MuBKEbv8_ShZGxuvgzQ Message-ID: Subject: Re: Need advice with iput() deadlock during writeback To: Al Viro Cc: Mateusz Guzik , linux-fsdevel , Linux Memory Management List , ceph-devel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: F18B41A0007 X-Stat-Signature: 96jf4d1qt1x3k7xg8f6ycb4wr76ume6u X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1758143976-304189 X-HE-Meta: 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 yRg+wOnj p/uyMpK8jwYs1AUjVddqJZrdtf5pcOAWhuJfbL+MsQjWtgGotbYeWwp/byhtw6c+A6vfoH3eUhN4kXiQKxvOdTUPI9j9pMQMBIzdAA6uHd5dxx9QypnkbmVck8hDoaagtIPwMHxOoTA/eX0VnCztPpuVO50sl3a6g+TaaA1ChkYdYSyQQzEc0zY23NQ7VRqPCpOvbwwt/bvh6k2XFBTQKUVp/scuETTYYw2pQlD+8bmwXWMdwGEBA4AD7SQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Sep 17, 2025 at 11:10=E2=80=AFPM Al Viro = wrote: > > Each filesystem (struct ceph_fs_client) has its own inode_wq. > > Yes, but > if (llist_add(&ci->async_llist, &delayed_ceph_iput_list)) > schedule_delayed_work(&delayed_ceph_iput_work, 1); > won't have anything to do with that. Mateusz did not mention that the list must be flushed on umount, but that's what "incomplete sketch" means. (The patch I submitted uses inode_wq, but that's a different thread.)