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<p class="MsoNormal">Walter,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for the details.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The stack trace below captures the lease thread in the middle of sending the “lease” RPC. This operation normally is not blocking, and we do not often block while sending the RPC. But the stack trace “does not show” whether there was anything
blocking the thread prior to the point where the RPCs are sent.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">At a first glance:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.430+0100: [W] counter: 0 (mark-idle: 0 mark-active: 0 pre-work: 0 post-work: 0) sched: (nvcsw: 0 nivcsw: 10)</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I believe<b> nivcsw: 10</b> means that the thread was scheduled out of the CPU involuntarily, possibly indicating that there is some CPU contention going on.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Could you open a case to get debug data collected? If the problem can be recreated, I think we’ll need a recreate of the problem with traces enabled.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> Felipe<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">----<o:p></o:p></p>
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<p class="MsoNormal">Felipe Knop knop@us.ibm.com<br>
GPFS Development and Security<br>
IBM Systems<br>
IBM Building 008<br>
2455 South Rd, Poughkeepsie, NY 12601<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">gpfsug-discuss <gpfsug-discuss-bounces@gpfsug.org> on behalf of Walter Sklenka <Walter.Sklenka@EDV-Design.at><br>
<b>Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@gpfsug.org><br>
<b>Date: </b>Wednesday, February 15, 2023 at 4:23 AM<br>
<b>To: </b>gpfsug main discussion list <gpfsug-discuss@gpfsug.org><br>
<b>Subject: </b>[EXTERNAL] Re: [gpfsug-discuss] Reasons for DiskLeaseThread Overloaded<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi! This is a „full“ sequence in mmfs. log. latest Fortunately this was also the last event until now (yesterday evening) Maybe you can have a look? 2023-02-14_19: 43: 51. 474+0100:
[N] Disk lease period expired 0. 030 seconds ago in cluster <o:p></o:p></span></p>
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<p class="MsoNormal">Hi!<o:p></o:p></p>
<p class="MsoNormal">This is a „full“ sequence in mmfs.log.latest<o:p></o:p></p>
<p class="MsoNormal">Fortunately this was also the last event until now (yesterday evening)
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Maybe you can have a look? <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:43:51.474+0100: [N] Disk lease period expired 0.030 seconds ago in cluster xxx-cluster. Attempting to reacquire the lease.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.430+0100: [W] ------------------[GPFS Critical Thread Watchdog]------------------</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.430+0100: [W] PID: 7294 State: R (DiskLeaseThread) is overloaded for more than 8 seconds</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.430+0100: [W] counter: 0 (mark-idle: 0 mark-active: 0 pre-work: 0 post-work: 0) sched: (nvcsw: 0 nivcsw: 10)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.430+0100: [W] Call Trace(PID: 7294):</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.431+0100: [W] #0: 0x000055CABE4A56AB NodeConn::sendMessage(TcpConn**, iovec*, int, unsigned char, int, int, int, unsigned int, DestTag*, int*, unsigned long long*,
unsigned long long*, unsi</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">gned int*, CondvarName, vsendCallback_t*) + 0x42B at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.432+0100: [W] #1: 0x000055CABE4A595F llc_send_msg(ClusterConfiguration*, NodeAddr, iovec*, int, unsigned char, int, int, int, unsigned int, DestTag*, int*, TcpConn**,
unsigned long long*, u</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">nsigned long long*, unsigned int*, CondvarName, vsendCallback_t*, int, unsigned int) + 0xDF at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.437+0100: [W] #2: 0x000055CABE479A55 MsgRecord::send() + 0x1345 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.438+0100: [W] #3: 0x000055CABE47A169 tscSendInternal(ClusterConfiguration*, unsigned int, unsigned char, int, int, NodeAddr*, TscReply*, TscScatteredBuff*, int,
int (*)(void*, ClusterConfig</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">uration*, int, NodeAddr*, TscReply*), void*, ChainedCallback**, __va_list_tag*) + 0x339 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.439+0100: [W] #4: 0x000055CABE47C39A tscSendWithCallback(ClusterConfiguration*, unsigned int, unsigned char, int, NodeAddr*, TscReply*, int (*)(void*, ClusterConfiguration*,
int, NodeAddr*,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">TscReply*), void*, void**, int, ...) + 0x1DA at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.440+0100: [W] #5: 0x000055CABE5F9853 MyLeaseState::renewLease(NodeAddr, TickTime) + 0x6E3 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.440+0100: [W] #6: 0x000055CABE5FA682 ClusterConfiguration::checkAndRenewLease(TickTime) + 0x192 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.441+0100: [W] #7: 0x000055CABE5FAAC6 ClusterConfiguration::RunLeaseChecks(void*) + 0x366 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.441+0100: [W] #8: 0x000055CABDF2B662 Thread::callBody(Thread*) + 0x42 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.441+0100: [W] #9: 0x000055CABDF18680 Thread::callBodyWrapper(Thread*) + 0xA0 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.441+0100: [W] #10: 0x00007F3B7563D1CA start_thread + 0xEA at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:07.441+0100: [W] #11: 0x00007F3B7435BE73 __GI___clone + 0x43 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:10.512+0100: [N] Disk lease reacquired in cluster xxx-cluster.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:10.512+0100: [N] Disk lease period expired 7.970 seconds ago in cluster xxx-cluster. Attempting to reacquire the lease.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">2023-02-14_19:44:12.563+0100: [N] Disk lease reacquired in cluster xxx-cluster.
</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thank you very much!<o:p></o:p></p>
<p class="MsoNormal">Best regards<o:p></o:p></p>
<p class="MsoNormal">Walter <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> gpfsug-discuss <gpfsug-discuss-bounces@gpfsug.org>
<b>On Behalf Of </b>Felipe Knop<br>
<b>Sent:</b> Mittwoch, 15. Februar 2023 00:06<br>
<b>To:</b> gpfsug main discussion list <gpfsug-discuss@gpfsug.org><br>
<b>Subject:</b> Re: [gpfsug-discuss] Reasons for DiskLeaseThread Overloaded<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">All,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">These messages like<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[W] ------------------[GPFS Critical Thread Watchdog]------------------</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">indicate that a “critical thread”, in this case the lease thread, was apparently blocked for longer than expected. This is usually not caused by delays in the network, but possibly by excessive CPU load, blockage while accessing the local
file system, or possible mutex contention.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Do you have other samples of the message, with a more complete stack trace? Or was the instance below the only one?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> Felipe<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">----<o:p></o:p></p>
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<p class="MsoNormal">Felipe Knop <a href="mailto:knop@us.ibm.com">knop@us.ibm.com</a><br>
GPFS Development and Security<br>
IBM Systems<br>
IBM Building 008<br>
2455 South Rd, Poughkeepsie, NY 12601<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">gpfsug-discuss <<a href="mailto:gpfsug-discuss-bounces@gpfsug.org">gpfsug-discuss-bounces@gpfsug.org</a>> on behalf of Walter Sklenka
<<a href="mailto:Walter.Sklenka@EDV-Design.at">Walter.Sklenka@EDV-Design.at</a>><br>
<b>Reply-To: </b>gpfsug main discussion list <<a href="mailto:gpfsug-discuss@gpfsug.org">gpfsug-discuss@gpfsug.org</a>><br>
<b>Date: </b>Tuesday, February 14, 2023 at 10:49 AM<br>
<b>To: </b>"<a href="mailto:gpfsug-discuss@gpfsug.org">gpfsug-discuss@gpfsug.org</a>" <<a href="mailto:gpfsug-discuss@gpfsug.org">gpfsug-discuss@gpfsug.org</a>><br>
<b>Subject: </b>[EXTERNAL] Re: [gpfsug-discuss] Reasons for DiskLeaseThread Overloaded</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi! I started with 5. 1. 6. 0 and now am at [root@ ogpfs1 ~]# mmfsadm dump version Dump level: verbose Build branch "5. 1. 6. 1 ". the messages started from the
beginning From: gpfsug-discuss <gpfsug-discuss-bounces@ gpfsug. org> On </span><o:p></o:p></p>
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<p class="MsoNormal">Hi!<o:p></o:p></p>
<p class="MsoNormal">I started with 5.1.6.0 and now am at [root@ogpfs1 ~]# mmfsadm dump version<o:p></o:p></p>
<p class="MsoNormal">Dump level: verbose<o:p></o:p></p>
<p class="MsoNormal">Build branch "5.1.6.1 ".<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">the messages started from the beginning <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> gpfsug-discuss <<a href="mailto:gpfsug-discuss-bounces@gpfsug.org">gpfsug-discuss-bounces@gpfsug.org</a>>
<b>On Behalf Of </b>Christian Vieser<br>
<b>Sent:</b> Dienstag, 14. Februar 2023 15:34<br>
<b>To:</b> <a href="mailto:gpfsug-discuss@gpfsug.org">gpfsug-discuss@gpfsug.org</a><br>
<b>Subject:</b> Re: [gpfsug-discuss] Reasons for DiskLeaseThread Overloaded<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p>What version of Spectrum Scale is running there? Do these errors appear since your last version update?<o:p></o:p></p>
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<p class="MsoNormal">Am 14.02.23 um 14:09 schrieb Walter Sklenka:<o:p></o:p></p>
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<p class="MsoNormal">Dear Collegues!<o:p></o:p></p>
<p class="MsoNormal">May I ask if anyone has a hint what could be the reason for Critical Thread Watchdog warnings for Disk Leases Threads?<o:p></o:p></p>
<p class="MsoNormal">Is this a “local node” Problem or a network problem ? <o:p></o:p></p>
<p class="MsoNormal">I see these messages sometimes arriving when NSD Servers which also serve as NFS servers when they get under heavy NFS load
<o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Following is an excerpt from mmfs.log.latest
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:06:53.235+0100: [N] Disk lease period expired 0.040 seconds ago in cluster xxx-cluster. Attempting to reacquire the lease.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:06:53.600+0100: [W] ------------------[GPFS Critical Thread Watchdog]------------------</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:06:53.600+0100: [W] PID: 7294 State: R (DiskLeaseThread) is overloaded for more than 8 seconds</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:06:53.600+0100: [W] counter: 0 (mark-idle: 0 mark-active: 0 pre-work: 0 post-work: 0) sched: (nvcsw: 0 nivcsw: 8)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:06:53.600+0100: [W] Call Trace(PID: 7294):</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:06:53.600+0100: [W] #0: 0x000055CABDF49521 BaseMutexClass::release() + 0x12 at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:06:53.600+0100: [W] #1: 0xB1557721BBABD900 _etext + 0xB154F7E646041C0E at ??:0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:07:09.554+0100: [N] Disk lease reacquired in cluster xxx-cluster.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:07:09.554+0100: [N] Disk lease period expired 5.680 seconds ago in cluster xxx-cluster. Attempting to reacquire the lease.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:07:11.605+0100: [N] Disk lease reacquired in cluster xxx-cluster.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:10:55.990+0100: [I] Command: mmlspool /dev/fs4vm all -L -Y</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:10:55.990+0100: [I] Command: successful mmlspool /dev/fs4vm all -L -Y</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:30:58.756+0100: [I] Command: mmlspool /dev/fs4vm all -L -Y</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_12:30:58.756+0100: [I] Command: successful mmlspool /dev/fs4vm all -L -Y</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_13:10:55.988+0100: [I] Command: mmlspool /dev/fs4vm all -L -Y</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_13:10:55.989+0100: [I] Command: successful mmlspool /dev/fs4vm all -L -Y</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_13:21:40.892+0100: [N] Node 10.20.30.2 (ogpfs2-hs.local) lease renewal is overdue. Pinging to check if it is alive</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_13:21:40.892+0100: [I] The TCP connection to IP address 10.20.30.2 ogpfs2-hs.local <c0n1>:[1] (socket 106) state: state=1 ca_state=0 snd_cwnd=10 snd_ssthresh=2147483647 unacked=0 probes=0
backoff=0 retransmits=0 rto=201000 rcv_ssthresh=1219344 rtt=121 rttvar=69 sacked=0 retrans=0 reordering=3 lost=0</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_13:22:00.220+0100: [N] Disk lease period expired 0.010 seconds ago in cluster xxx-cluster. Attempting to reacquire the lease.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_13:22:08.298+0100: [N] Disk lease reacquired in cluster xxx-cluster.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_13:30:58.760+0100: [I] Command: mmlspool /dev/fs4vm all -L -Y</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2023-02-14_13:30:58.760+0100: [I] Command: successful mmlspool /dev/fs4vm all -L -Y</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Mit freundlichen Grüßen<br>
<b><i>Walter Sklenka</i></b><br>
</span><b><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:gray">Technical Consultant</span></i></b><span style="color:black">
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