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([47.246.98.222]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-819c52fc9bdsm22557474b3a.32.2026.01.14.00.51.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Jan 2026 00:51:30 -0800 (PST) From: weipeng To: oneukum@suse.com, linux-i2c@vger.kernel.org Cc: anna-maria@linutronix.de, coderlogicwei@gmail.com, frederic@kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Subject: Re: [syzbot] [usb?] INFO: task hung in i2c_tiny_usb_disconnect Date: Wed, 14 Jan 2026 16:51:25 +0800 Message-Id: <20260114085125.859740-1-coderlogicwei@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <8bed5082-0aef-4dee-8239-c3e8aba50f9f@suse.com> References: <8bed5082-0aef-4dee-8239-c3e8aba50f9f@suse.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, i2c_del_adapter in i2c-core-base.c: > void i2c_del_adapter(struct i2c_adapter *adap) > { > ... > /* wait until all references to the device are gone > * > * FIXME: This is old code and should ideally be replaced by an > * alternative which results in decoupling the lifetime of the struct > * device from the i2c_adapter, like spi or netdev do. Any solution > * should be thoroughly tested with DEBUG_KOBJECT_RELEASE enabled! > */ > init_completion(&adap->dev_released); > device_unregister(&adap->dev); > wait_for_completion(&adap->dev_released); > ... > } This issue looks like caused by i2c_del_adapter(). It waits for too long so it may cause the hung. Thanks, weipeng