linux-kernel - "[PATCH] nfsd: rework refcounting in filecache" caused nfstest/test/nfstest

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Date:   Thu, 27 Apr 2023 03:50:27 +0000
From:   "Jie Zhou (Fujitsu)" <zhoujie2011@...itsu.com>
To:     "chuck.lever@...cle.com" <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "Mora, Jorge" <Jorge.Mora@...app.com>
CC:     linux-nfs <linux-nfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: "[PATCH] nfsd: rework refcounting in filecache" caused
 nfstest/test/nfstest_delegation stuck

hi,

    Download nfstest program from 
"http://git.linux-nfs.org/?p=mora/nfstest.git;a=summary".
    And run following test command and stuck at recall12 recall14 
recall20 recall22 recall40 recall42 recall48 recall50.
    ./nfstest_delegation --nfsversion=4.0 -e /nfsroot --server <server 
ip> --client <client2 ip> --trcdelay 10
    test OS: RHEL9.2 Nightly Build

    After I bisect linux kerenl, found that following patch caused above 
bug.
 From ac3a2585f018f10039b4a856dcb122da88c1c1c9 Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@...nel.org>
Date: Sun, 11 Dec 2022 06:19:33 -0500
Subject: [PATCH] nfsd: rework refcounting in filecache

    Run following command at different kernel version.
./nfstest_delegation --nfsversion=4.0 -e /nfsroot --server 
192.168.122.153 --client 192.168.122.152 --trcdelay 10 -v all 
--createlog --keeptraces --rexeclog recall22 
 >nfstest-delegationv4-log_recall22 2>&1

    The following test result are attached.
    kernel:
commit 0cfd8703e7da687924371e9bc77a025bdeba9637
Merge: 793582ff47f8 d3f2c402e448
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Tue Apr 25 18:44:10 2023 -0700
     Merge tag 'pm-6.4-rc1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
    result:
test program stuck
    log:
nfstest-delegationv4-log_recall22_6.3.0

    kernel:
commit ac3a2585f018f10039b4a856dcb122da88c1c1c9
Author: Jeff Layton <jlayton@...nel.org>
Date:   Sun Dec 11 06:19:33 2022 -0500
     nfsd: rework refcounting in filecache
    result:
test program stuck
    log:
nfstest-delegationv4-log_recall22_ac3a2585f018

    kernel:
commit e78e274eb22d966258a3845acc71d3c5b8ee2ea8
Author: Kees Cook <keescook@...omium.org>
Date:   Fri Dec 2 12:48:59 2022 -0800
     NFSD: Avoid clashing function prototypes
    result:
test program stop normally
    log:
nfstest-delegationv4-log_recall22_e78e274eb22d

best regards,
-- 
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zhoujie
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E-Mail：zhoujie2011@...itsu.com
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