strace returns ENOSYS error

[MikalaiKeida at ibagroup.eu]

Hello,

I have faced with a problem in the strace tool.
When I tried to get strace with already running process I have received 
the following output:


writev(10, [{"Ticket 6660\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
1047552}, {"Ticket 7172\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
1023}], 2) = 1048575
writev(10, 
[{"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
1047552}, 
{"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
1023}], 2) = 1048575
writev(10, [{"Ticket 7685\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
1047552}, {"Ticket 8197\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
1023}], 2) = -1 ENOSYS (Function not implemented)
writev(10, 
[{"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
1047552}, 
{"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
1023}], 2) = -1 ENOSYS (Function not implemented)


Two fist calls were traced successfully. The latest calls failed with 
ENOSYS while they are successful.


Environment info:

This is SLES12 SP3 machine.
# uname -a
Linux s225qa01 4.4.140-94.42-default #1 SMP Tue Jul 17 07:44:50 UTC 2018 
(0b375e4) x86_64 x86_64 x86_64 GNU/Linux
# strace -V
strace -- version 4.10
# gcc -v
...
Thread model: posix
gcc version 4.8.5 (SUSE Linux) 

Thanks,
Mikalai Keida
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