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Bug 2102568

Summary:	Reading of PHC fails and phc2sys exits
Product:	Red Hat Enterprise Linux 9	Reporter:	Miroslav Lichvar <mlichvar>
Component:	linuxptp	Assignee:	Miroslav Lichvar <mlichvar>
Status:	CLOSED ERRATA	QA Contact:	Yalin.Li <yalli>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	9.0	CC:	keyoung
Target Milestone:	rc	Keywords:	Triaged
Target Release:	---	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	linuxptp-3.1.1-4.el9	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-11-15 10:38:12 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Miroslav Lichvar 2022-06-30 08:50:56 UTC

This bug was initially created as a copy of Bug #2079129

I am copying this bug because: 
This should be fixed in RHEL9 to avoid regressions.

Description of problem:
Reading of PHC sometimes fails with ice driver and phc2sys exit.

Version-Release number of selected component (if applicable):
linuxptp-3.1.1-1.el8.x86_64

How reproducible:
Randomly but happens often

Steps to Reproduce:
1. Run phc2sys with ice driver
2. Eventually it fails to read PHC and exit

Actual results:
phc2sys exits

Expected results:
phc2sys should retry again

Additional info:
Apr 25 10:18:38 MR400411-1123-785-980-11042-984fee184b8b phc2sys[3228834]: phc2sys[1194475.374]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
Apr 25 10:18:38 MR400411-1123-785-980-11042-984fee184b8b kernel: ice 0000:16:00.0: PTP failed to get time
Apr 25 10:18:38 MR400411-1123-785-980-11042-984fee184b8b phc2sys[3228834]: [1194475.374] ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
Apr 25 10:18:38 MR400411-1123-785-980-11042-984fee184b8b systemd[1]: phc2sys.service: Main process exited, code=exited, status=255/n/a
Apr 25 10:18:38 MR400411-1123-785-980-11042-984fee184b8b systemd[1]: phc2sys.service: Failed with result 'exit-code'.

There is this patch upstream https://sourceforge.net/p/linuxptp/mailman/message/37623532/ from Miroslav Lichvar. I saw it's not upstream yet but wondering if we could backport it to RHEL.

Comment 1 Yalin.Li 2022-07-07 08:52:58 UTC

phc2sys could keep running after error happened. Marked as Tested.
# rpm -q linuxptp
linuxptp-3.1.1-4.el9.x86_64
# grep busy phc2sys.log 
phc2sys[607967.745]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[607974.753]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[607999.094]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608016.665]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608033.133]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608043.135]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608044.525]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608079.745]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608104.055]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608123.356]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608128.562]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608155.064]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608157.247]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608163.339]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608204.126]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608215.140]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608226.722]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608261.138]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608277.338]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608308.749]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608324.161]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608336.520]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608372.131]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608385.491]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608429.686]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608474.730]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608511.156]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608522.724]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608528.432]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608532.555]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608540.372]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608546.557]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608559.681]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608589.306]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608629.508]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608642.301]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608648.732]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608663.749]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608702.733]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608703.472]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608729.293]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608756.552]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608768.376]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608784.072]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608806.285]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608832.148]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608840.076]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608843.508]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608859.652]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608871.133]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608892.151]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608904.778]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608915.158]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608931.666]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608938.299]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[608996.687]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609004.348]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609017.712]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609049.490]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609074.272]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609085.526]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609085.694]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609095.476]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609113.184]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609121.327]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609130.711]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609143.729]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609145.729]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609160.555]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609174.308]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609186.308]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609195.520]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609202.260]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609229.126]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609237.574]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609254.697]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609286.561]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609348.764]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609368.536]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609501.550]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609533.516]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609587.579]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609589.093]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609590.520]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609591.519]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609601.714]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609644.086]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609647.723]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609654.716]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609661.532]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609697.347]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609708.722]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609732.739]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609733.546]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609747.588]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609757.136]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609763.080]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609765.282]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609808.327]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609817.333]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[609823.506]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
# tail phc2sys.log 
phc2sys[612576.715]: CLOCK_REALTIME phc offset        -1 s2 freq  -82423 delay    542
phc2sys[612576.778]: CLOCK_REALTIME phc offset       -15 s2 freq  -82437 delay    540
phc2sys[612576.841]: CLOCK_REALTIME phc offset        -4 s2 freq  -82431 delay    492
phc2sys[612576.903]: CLOCK_REALTIME phc offset       -13 s2 freq  -82441 delay    543
phc2sys[612576.966]: CLOCK_REALTIME phc offset       -20 s2 freq  -82452 delay    545
phc2sys[612577.028]: CLOCK_REALTIME phc offset        -1 s2 freq  -82439 delay    493
phc2sys[612577.111]: CLOCK_REALTIME phc offset         2 s2 freq  -82436 delay    496
phc2sys[612577.194]: CLOCK_REALTIME phc offset        -7 s2 freq  -82444 delay    543
phc2sys[612577.316]: CLOCK_REALTIME phc offset        -9 s2 freq  -82448 delay    492
phc2sys[612577.379]: CLOCK_REALTIME phc offset        -1 s2 freq  -82443 delay    541

Comment 4 Yalin.Li 2022-08-08 09:00:39 UTC

phc2sys won't be interupt by the error. Marked as VERIFIED.
# rpm -q linuxptp
linuxptp-3.1.1-4.el8.x86_64
# grep busy phc2sys.log 
phc2sys[6275.936]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[6293.945]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[6295.132]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[6310.148]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[6313.897]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
phc2sys[6323.348]: ioctl PTP_SYS_OFFSET_EXTENDED: Device or resource busy
# tail phc2sys.log
phc2sys[6400.867]: CLOCK_REALTIME phc offset        12 s2 freq  -82546 delay    480
phc2sys[6400.930]: CLOCK_REALTIME phc offset        -6 s2 freq  -82561 delay    494
phc2sys[6400.992]: CLOCK_REALTIME phc offset        -2 s2 freq  -82558 delay    505
phc2sys[6401.055]: CLOCK_REALTIME phc offset        35 s2 freq  -82522 delay    452
phc2sys[6401.117]: CLOCK_REALTIME phc offset        -3 s2 freq  -82550 delay    500
phc2sys[6401.180]: CLOCK_REALTIME phc offset         4 s2 freq  -82543 delay    545
phc2sys[6401.243]: CLOCK_REALTIME phc offset        10 s2 freq  -82536 delay    495
phc2sys[6401.305]: CLOCK_REALTIME phc offset        -4 s2 freq  -82547 delay    548
phc2sys[6401.368]: CLOCK_REALTIME phc offset         2 s2 freq  -82542 delay    500
phc2sys[6401.431]: CLOCK_REALTIME phc offset        -8 s2 freq  -82552 delay    500

Comment 8 errata-xmlrpc 2022-11-15 10:38:12 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (linuxptp bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:8220