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* MIPS: bug: gettimeofday syscall broken on CI20 board?
@ 2019-11-07 16:21 H. Nikolaus Schaller
  0 siblings, 0 replies; only message in thread
From: H. Nikolaus Schaller @ 2019-11-07 16:21 UTC (permalink / raw)
  To: Vincenzo Frascino
  Cc: Ralf Baechle, Paul Burton, MIPS Creator CI20 Development,
	Discussions about the Letux Kernel, linux-mips,
	Linux Kernel Mailing List

I am trying to run v5.4-rc6 on the CI20 board (jz4780) and it
is almost ok. Except one strange thing.

If I install a v4.19.81 kernel I can initialize the
ethernet interface and dhclient works.

If I install a v5.4-rc6 kernel on exactly the same
rootfs dhclient fails with

root@letux:~# dhclient
../../../../lib/isc/unix/time.c:200: Operation not permitted

I have done some strace and the first significant difference
is that with v5.4-rc6 there is no gettimeofday syscall.

Another symptom pointing in the same direction is that
after manually assigning an IP address I can run ping
but get strange time values.

So it may be that

24640f233b46 mips: Add support for generic vDSO

did break gettimeofday when used with latest Debian Stretch
libraries. I tried to git revert but there are conflicts.

Just a side-note: both kernels work with Debian Jessie,
which likely has an older gettimeofday wrapper that
is not influenced by some subtle change.

BR and thanks,
Nikolaus Schaller

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2019-11-07 16:21 MIPS: bug: gettimeofday syscall broken on CI20 board? H. Nikolaus Schaller

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