linux-kernel - Re: [PATCH v3] scsi: avoid potential deadloop in iscsi_if

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Message-ID: <yq18soksgji.fsf@oracle.com>
Date:   Tue, 12 Nov 2019 20:37:05 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     "wubo \(T\)" <wubo40@...wei.com>
Cc:     "lduncan\@suse.com" <lduncan@...e.com>,
        "cleech\@redhat.com" <cleech@...hat.com>,
        "jejb\@linux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen\@oracle.com" <martin.petersen@...cle.com>,
        "open-iscsi\@googlegroups.com" <open-iscsi@...glegroups.com>,
        "linux-scsi\@vger.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Ulrich Windl <Ulrich.Windl@...uni-regensburg.de>,
        Mingfangsen <mingfangsen@...wei.com>,
        "liuzhiqiang \(I\)" <liuzhiqiang26@...wei.com>
Subject: Re: [PATCH v3] scsi: avoid potential deadloop in iscsi_if_rx func


> In iscsi_if_rx func, after receiving one request through
> iscsi_if_recv_msg func, iscsi_if_send_reply will be called to try to
> reply the request in do-loop. If the return of iscsi_if_send_reply
> func return -EAGAIN all the time, one deadloop will occur.
>  
> For example, a client only send msg without calling recvmsg func, 
> then it will result in the watchdog soft lockup. 
> The details are given as follows,

Lee/Chris/Ulrich: Please review!

-- 
Martin K. Petersen	Oracle Linux Engineering