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Thu, 02 Jul 2026 01:21:45 -0700 (PDT) Received: from google.com ([2a00:79e0:2031:6:4e88:f8c5:c424:2d65]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ca9a7c397asm10090435ad.0.2026.07.02.01.21.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2026 01:21:44 -0700 (PDT) Date: Thu, 2 Jul 2026 17:21:41 +0900 From: Sergey Senozhatsky To: Oliver Neukum Cc: Sergey Senozhatsky , Alan Stern , linux-usb@vger.kernel.org, linux-scsi@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, linux-kernel@vger.kernel.org, Tomasz Figa Subject: Re: [usb-storage] [RFC PATCH] usb: storage: uas: limit consecutive device resets in error handling Message-ID: References: <20260701040335.810297-1-senozhatsky@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On (26/07/02 10:08), Oliver Neukum wrote: > On 02.07.26 04:25, Sergey Senozhatsky wrote: > > > <4>[ 750.651133] rq: tag=0 hctx=0 op=WRITE sector=13860872 len=524288 age=76536 ms pid=11900 comm=image_burner state=D > > <4>[ 750.651205] rq: tag=1 hctx=0 op=WRITE sector=13865992 len=524288 age=76536 ms pid=11900 comm=image_burner state=D > > <4>[ 750.651263] rq: tag=2 hctx=0 op=WRITE sector=13863944 len=524288 age=76536 ms pid=11900 comm=image_burner state=D > > <4>[ 750.651320] rq: tag=3 hctx=0 op=WRITE sector=13862920 len=524288 age=76536 ms pid=11900 comm=image_burner state=D > > <4>[ 750.651379] rq: tag=4 hctx=0 op=WRITE sector=13861896 len=524288 age=76536 ms pid=11900 comm=image_burner state=D > > <4>[ 750.651437] rq: tag=5 hctx=0 op=WRITE sector=13864968 len=524288 age=76536 ms pid=11900 comm=image_burner state=D > > [..] > > <4>[ 812.091136] rq: tag=0 hctx=0 op=WRITE sector=13863944 len=524288 age=137976 ms pid=11900 comm=image_burner state=D > > <4>[ 812.091194] rq: tag=1 hctx=0 op=WRITE sector=13862920 len=524288 age=137976 ms pid=11900 comm=image_burner state=D > > <4>[ 812.091242] rq: tag=2 hctx=0 op=WRITE sector=13861896 len=524288 age=137976 ms pid=11900 comm=image_burner state=D > > <4>[ 812.091289] rq: tag=3 hctx=0 op=WRITE sector=13860872 len=524288 age=137976 ms pid=11900 comm=image_burner state=D > > <4>[ 812.091335] rq: tag=4 hctx=0 op=WRITE sector=13865992 len=524288 age=137976 ms pid=11900 comm=image_burner state=D > > <4>[ 812.091381] rq: tag=5 hctx=0 op=WRITE sector=13864968 len=524288 age=137976 ms pid=11900 comm=image_burner state=D > > This looks to me like the block layer keeps writing to the same sectors. > In other words the issue I see is with the block layer. Oh, this is just our simple blk-mq watchdog. Those are the same 5 stalled requests (WRITES), it's just they got reported twice - same tags, same sectors, etc. they just got older (age 78k ms -> 137k ms since submission). > Do you know what triggers the error handler at the very first timeß Unfortunately, no.