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<== Date ==> <== Thread ==>

Subject: Re: ioc crashing while using asyn & modbus
From: Mark Rivers <rivers@cars.uchicago.edu>
To: Gary Croke <gcroke@jlab.org>
Cc: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Thu, 13 Jul 2017 01:11:11 +0000
Hi Gary,

I just noticed that you are using Modbus R2-8. 

R2-9 is the latest release, and this is from the R2-9 release notes.

*****************
Added error checking to make sure the length of the reply from the Modbus server is the expected value. Previously garbled communications could cause a crash because of array bounds violation.
*****************

This sounds like it could be the problem you are seeing. I suggest you try R2-9.

Mark

Sent from my iPhone

> On Jul 12, 2017, at 7:35 AM, Gary Croke <gcroke@jlab.org> wrote:
> 
> Hi All,
> 
> I am using Asyn and Mark's modbus driver to talk a number of utility meters (primarily Eaton electricity meters).  My soft ioc is frequently crashing with a seg fault.  Connectivity of the meters is patchy in some cases and I cannot guarantee their availability at all times, resulting in a lot of communication errors.  In the instances I am having trouble, an intermediate gateway device hosts the modbus server and supports multiple downstream meters.  I can mitigate the situation by dedicating a soft ioc per IP address (gateway), but I'd like to identify the source of the problem if possible.  I have other iocs using the same software to talk to other models of meter without any issues.
> 
> I've tried to detail some of my configuration and the errors I'm seeing below.  Thanks for any feedback.
> 
> Gary
> 
> 
> Versions:
> =========
> EPICS:  3.14.12.3
> ASYN:   4-31
> MODBUS: 2-8
> 
> 
> Asyn & modbus driver initialization:
> ====================================
> drvAsynIPPortConfigure("pxg27", "129.57.15.27:502", 0, 1, 1)
> 
> modbusInterposeConfig("pxg27", 0, 5000)
> 
> drvModbusAsynConfigure("SA1-SB_1000", "pxg27", 1, 3, 999, 28, 8, 100, "iq150")
> drvModbusAsynConfigure("SA1-SB_1100", "pxg27", 1, 3, 1099, 18, 6, 100, "iq150")
> drvModbusAsynConfigure("SA1-SB_3118", "pxg27", 1, 3, 3117, 4, 8, 100, "iq150")
> 
> drvModbusAsynConfigure("SA2-SB_1000", "pxg27", 2, 3, 999, 28, 8, 100, "iq150")
> drvModbusAsynConfigure("SA2-SB_1100", "pxg27", 2, 3, 1099, 18, 6, 100, "iq150")
> drvModbusAsynConfigure("SA2-SB_3118", "pxg27", 2, 3, 3117, 4, 8, 100, "iq150")
> 
> ... several other asyn ports, etc. ...
> 
> dbLoadRecords("powerMetersV/db/iq150.db", "meter=SA1-SB")
> dbLoadRecords("powerMetersV/db/iq150.db", "meter=SA2-SB")
> 
> 
> Example Record:
> ===============
> record(ai,"$(meter):rcvWh") {
>    field(SCAN,"10 second")
>    field(DTYP,"asynInt32")
>    field(FLNK,"$(meter):rcvkWh")
>    field(INP,"@asyn($(meter)_1100, 0)")
>    field(EGU,"Wh")
> }
> 
> 
> Error trace #1:
> ===============
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/asynDriver/asynManager.c:1807] [Compton_1000Read,0x8679f20,50] pxg12 queueUnlockPort
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/asynDriver/asynManager.c:1838] [Compton_1000Read,0x8679f20,50] pxg12 asynManager::queueUnlockPort waiting for event
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/asynDriver/asynManager.c:860] [pxg12,0x8660100,90] asynManager::portThread port=pxg12 callback
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/asynDriver/asynManager.c:914] [pxg12,0x8660100,90] pxg12 asynManager::queueLockPortCallback signaling begin event
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/asynDriver/asynManager.c:919] [pxg12,0x8660100,90] pxg12 asynManager::queueLockPortCallback waiting for mutex from queueUnlockPort
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/asynDriver/asynManager.c:1841] [Compton_1000Read,0x8679f20,50] pxg12 queueUnlockPort unlock mutex 0xb4f006e0 complete.
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/asynDriver/asynManager.c:1786] [HNSS_Moeller_1000Read,0x8673ee8,50] pxg12 asynManager::queueLockPort got event from callback
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/drvAsynSerial/drvAsynIPPort.c:795] [HNSS_Moeller_1000Read,0x8673ee8,50] 129.57.15.12:502 flush
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/drvAsynSerial/drvAsynIPPort.c:556] [HNSS_Moeller_1000Read,0x8673ee8,50] 129.57.15.12:502 write.
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/drvAsynSerial/drvAsynIPPort.c:558] [HNSS_Moeller_1000Read,0x8673ee8,50] 129.57.15.12:502 write 12
> 
> \000\001\000\000\000\006\002\003\003ç\000\034
> 
> 00 01 00 00 00 06 02 03 03 e7 00 1c 
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/drvAsynSerial/drvAsynIPPort.c:654] [HNSS_Moeller_1000Read,0x8673ee8,50] wrote 12 to 129.57.15.12:502, return asynSuccess.
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/interfaces/asynOctetSyncIO.c:262] [HNSS_Moeller_1000Read,0x8673ee8,50] asynOctetSyncIO wrote:
> ç
> \002\003\003ç\000\034
> 
> 02 03 03 e7 00 1c 
> 2017/07/05 15:58:06.942 [pxg12,-1,0] [../../asyn/drvAsynSerial/drvAsynIPPort.c:674] [HNSS_Moeller_1000Read,0x8673ee8,50] 129.57.15.12:502 read.
> 2017/07/05 15:58:06.942 drvModbusAsyn::doModbusIO port Compton_1000 error calling writeRead, error=129.57.15.12:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0
> 2017/07/05 15:58:06.942 Compton:aAmps devAsynFloat64 process read error 
> 2017/07/05 15:58:06.942 Compton:abVolt devAsynFloat64 process read error 
> 2017/07/05 15:58:06.942 Compton:anVolt devAsynFloat64 process read error 
> 2017/07/05 15:58:06.942 Compton:bAmps devAsynFloat64 process read error 
> 2017/07/05 15:58:06.942 Compton:bcVolt devAsynFloat64 process read error 
> 2017/07/05 15:58:06.942 Compton:bnVolt devAsynFloat64 process read error 
> 2017/07/05 15:58:06.943 Compton:cAmps devAsynFloat64 process read error 
> 2017/07/05 15:58:06.943 Compton:caVolt devAsynFloat64 process read error 
> 2017/07/05 15:58:06.943 Compton:cnVolt devAsynFloat64 process read error 
> 2017/07/05 15:58:06.943 Compton:frequency devAsynFloat64 process read error 
> 2017/07/05 15:58:06.943 Compton:totVA devAsynFloat64 process read error 
> 2017/07/05 15:58:06.943 Compton:totVAR devAsynFloat64 process read error 
> 2017/07/05 15:58:06.943 Compton:totW devAsynFloat64 process read error 
> 2017/07/05 15:58:07.042 drvModbusAsyn::doModbusIO port Compton_1000 has I/O error
> 2017/07/05 15:58:07.042 [pxg12,-1,0] [../../asyn/asynDriver/asynManager.c:1518] [Compton_1000Read,0x8679f20,50] pxg12 addr -1 queueRequest priority 3 not lockHolder
> Segmentation fault (core dumped)
> 
> 
> Error trace #2:
> ===============
> 2017/07/11 10:03:48.585 pxg13 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:48.664 pxg12 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:48.664 drvModbusAsyn::doModbusIO port C_UPH5_3118 error calling writeRead, error=129.57.15.12:502 read error: Connection reset by peer, nwrite=6/6, nread=0
> 2017/07/11 10:03:48.664 C_UPH5:maxDemPosVAR devAsynFloat64 process read error 
> 2017/07/11 10:03:48.664 C_UPH5:maxDemPosW devAsynFloat64 process read error 
> 2017/07/11 10:03:48.686 pxg30 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:48.756 pxg11 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:48.764 drvModbusAsyn::doModbusIO port C_UPH5_3118 has I/O error
> 2017/07/11 10:03:48.780 pxg13 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:48.838 pxg11 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> ...
> 2017/07/11 10:03:52.104 pxg13 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:52.104 pxg27 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:52.104 drvModbusAsyn::doModbusIO port SA1-SB_1100 error calling writeRead, error=129.57.15.27:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0
> 2017/07/11 10:03:52.104 SA1-SB:dlvWh devAsynInt32 process read error 
> 2017/07/11 10:03:52.104 SA1-SB:negVARh devAsynInt32 process read error 
> 2017/07/11 10:03:52.104 SA1-SB:netVARh devAsynInt32 process read error 
> 2017/07/11 10:03:52.104 SA1-SB:netWh devAsynInt32 process read error 
> 2017/07/11 10:03:52.104 SA1-SB:posVARh devAsynInt32 process read error 
> 2017/07/11 10:03:52.104 SA1-SB:rcvWh devAsynInt32 process read error 
> 2017/07/11 10:03:52.104 SA1-SB:totVARh devAsynInt32 process read error 
> 2017/07/11 10:03:52.104 SA1-SB:totVAh devAsynInt32 process read error 
> 2017/07/11 10:03:52.104 SA1-SB:totWh devAsynInt32 process read error 
> 2017/07/11 10:03:52.145 pxg30 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:52.153 pxg13 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:52.189 pxg11 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:52.204 drvModbusAsyn::doModbusIO port SA1-SB_1100 has I/O error
> 2017/07/11 10:03:52.225 pxg30 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:52.278 pxg11 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> ...
> 2017/07/11 10:03:53.463 pxg13 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> 2017/07/11 10:03:53.467 pxg27 asynManager::queueLockPortCallback got mutex from queueUnlockPort, signaling end event
> Segmentation fault (core dumped)
> 
> 
> Also seen once or twice:
> ========================
> A call to 'assert(status == epicsMutexLockOK)'
>    by thread 'A/MP/HAD_9018Read' failed in ../../asyn/asynDriver/asynManager.c line 2342.
> EPICS Release EPICS R3.14.12.3 $Date: Mon 2012-12-17 14:11:47 -0600$.
> Local time is 2017-06-29 14:43:11.601380355 EDT
> Please E-mail this message to the author or to tech-talk@aps.anl.gov
> Calling epicsThreadSuspendSelf()

References:
ioc crashing while using asyn & modbus Gary Croke

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