linux-kernel - NFS client hangs due to waiting for FSSTAT to complete and NFS server returning NFS

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Message-ID: <20241122072408.2973342-1-jiangheng14@huawei.com>
Date: Fri, 22 Nov 2024 15:24:08 +0800
From: jiangheng <jiangheng14@...wei.com>
To: <trondmy@...nel.org>, <anna@...nel.org>
CC: <linux-nfs@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<yanan@...wei.com>, <gaoxingwang1@...wei.com>
Subject: NFS client hangs due to waiting for FSSTAT to complete and NFS server returning NFS_JUKEBOX(10008) to FSSTAT

some nfs servers in the server cluseter restart, and other servers return NFS_JUKEBOX.
The client's applications hang for more than 600s due to rpc tasks are repeatedly retried:

nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
{
    int res;
    do {
        res = rpc_call_sync(clnt, msg, flags);
        if (res != -EJUKEBOX)
            break;
        __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
        schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
        res = -ERESTARTSYS;
    } while (!fatal_signal_pending(current));
    return res;
}

Does the nfs3_rpc_wrapper function need to add a retry times and exit the loop when retry times reaches the maximum?