strace returns ENOSYS error

[Dmitry V. Levin]

Hi,

On Thu, Dec 06, 2018 at 01:56:02PM +0300, MikalaiKeida at ibagroup.eu wrote:
> 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.

strace just reports whatever it gets from the kernel, so if it prints
-1 ENOSYS, it means that the kernel reported it.

> 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

This version of strace was released 3.75 years ago, please consider
updating it.


-- 
ldv
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