[#5678] ptpd would switch from master to slave status if there is another machine set to master in the lan

Submitted By: Mingquan Pan

Open Date

2009-11-12 05:32:56

Priority:

Low Assignee:

Barry Song

Status:

Open Fixed In Release:

N/A

Found In Release:

2010R1 Release:

Category:

N/A Board:

N/A

Processor:

BF518 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Under Debugging

Uboot version or rev.:

Toolchain version or rev.:

trunk head

App binary format:

N/A

Summary: ptpd would switch from master to slave status if there is another machine set to master in the lan

Details:

ptpd would switch from master to slave status if there is another machine set to master in the lan.

Connect two bf518F ezbrd onto the company network,

Master one is:

root:/> ifconfig

eth0 Link encap:Ethernet HWaddr 00:E0:FE:6A:65:53

inet addr:10.99.29.117 Bcast:10.99.29.255 Mask:255.255.255.0

UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1157 errors:0 dropped:0 overruns:0 frame:0

TX packets:343 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:146585 (143.1 KiB) TX bytes:40523 (39.5 KiB)

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

root:/> date

Sat Nov 14 17:16:46 UTC 2009

root:/> ps auxf

PID USER VSZ STAT COMMAND

1 root 108 S /init

2 root 0 SW< [kthreadd]

3 root 0 SW< [ksoftirqd/0]

4 root 0 SW< [watchdog/0]

5 root 0 SW< [events/0]

6 root 0 SW< [khelper]

9 root 0 SW< [async/mgr]

56 root 0 SW< [kblockd/0]

63 root 0 SW< [kmmcd]

81 root 0 SW [khungtaskd]

82 root 0 SW [pdflush]

83 root 0 SW [pdflush]

84 root 0 SW< [kswapd0]

199 root 0 SW< [mtdblockd]

200 root 0 SW< [bfin-spi.0]

202 root 0 SW< [bfin-spi.1]

238 root 423 S -/bin/sh

239 root 44 S /sbin/inetd

240 root 412 S /sbin/syslogd -n

241 root 408 S /sbin/klogd -n

242 root 36 S /bin/watchdogd -f -s

244 root 88 S dhcpcd

247 root 56 S /bin/telnetd

248 root 423 S -sh

266 root 92 S ptpd -z linux_hw

273 root 412 R ps auxf

Slave one is:

root:/> date

Sat Nov 14 17:16:29 UTC 2009

root:/> ps auxf

PID USER VSZ STAT COMMAND

1 root 108 S /init

2 root 0 SW< [kthreadd]

3 root 0 SW< [ksoftirqd/0]

4 root 0 SW< [watchdog/0]

5 root 0 SW< [events/0]

6 root 0 SW< [khelper]

9 root 0 SW< [async/mgr]

56 root 0 SW< [kblockd/0]

63 root 0 SW< [kmmcd]

81 root 0 SW [khungtaskd]

82 root 0 SW [pdflush]

83 root 0 SW [pdflush]

84 root 0 SW< [kswapd0]

199 root 0 SW< [mtdblockd]

200 root 0 SW< [bfin-spi.0]

202 root 0 SW< [bfin-spi.1]

238 root 423 S -/bin/sh

239 root 44 S /sbin/inetd

240 root 412 S /sbin/syslogd -n

241 root 408 S /sbin/klogd -n

242 root 36 S /bin/watchdogd -f -s

246 root 92 S ptpd -z linux_hw -g

251 root 412 R ps auxf

root:/> date

Sat Nov 14 17:16:5root:/> ifconfig

eth0 Link encap:Ethernet HWaddr 00:E0:FE:22:EB:E4

inet addr:10.99.29.111 Bcast:10.99.29.255 Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:6 errors:0 dropped:0 overruns:0 frame:0

TX packets:1 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:909 (909.0 B) TX bytes:42 (42.0 B)

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

1 UTC 2009

And then, if you reboot the slave one and set it with ptpd -z linux_hw, it would be master and the previous master one would be slave and change the time with it. At this time , on the screen, the date of new slave(previous master) is:

oot:/> date

Thu Oct 11 05:56:38 UTC 2035

which is the same with the new master(previous slave).

The kernel version is:

root:/> version

kernel: Linux release 2.6.31.6-ADI-2010R1-pre-svn7786, build #10 Thu Nov 12 16:22:51 CST 2009

toolchain: bfin-uclinux-gcc release gcc version 4.3.4 (ADI-trunk/svn-3679)

user-dist: release svn-9135, build #3 Thu Nov 12 16:22:18 CST 2009

root:/>

Follow-ups

--- Barry Song 2009-11-12 11:18:23

Practically, there is one host running "ptpd -z linux_hw" as the

master in the whole network and others run "ptpd -z linux_hw -g" as

slaves. It is not a real-life case for two hosts to run "ptpd -z

linux_hw" as masters. But it doesn't make sense that the 1st master becomes

slave while the 2nd startups. So I will check the state machine of ptpd to find

any possible robustness issue in it.

Thanks for pointing out.

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