btsync segmentation fault

[MixedBeef]

Hi,

I tried to install BitTorrent Sync from the AUR but unfortunately it does not work. It worked the last couple of months but since today it stopped working. I don't know if the btsync binary is damaged or some of the last Arch Updates (gcc, kernel and so on) damaged it.

$this->bbcode_second_pass_code('', '❯ btsync -h
[1] 11105 segmentation fault (core dumped) btsync -h')

Also I tried to install older versions than 2.3.7 like 2.3.6, 2.3.5 and 2.3.3 which worked in the past but now they stopped working so I guess that some other update is responsible for the segmentation fault maybe

[zifnab]

just to confirm MixedBeef allegations.
as can be seen in the aur btsync forum he linked, this issue was confirmed by many users:
- seems to only happen on Arch ARM (x86, x64 works fine), be it v6h, v7h (different v7 boards)
- even older versions of btsync that have been working for months started to fail (segmentation fault, even with something as simple/straight/ignoring settings as "btsync --help": segmentation fault right away)
- started happening around a week ago
so something apart from btsync has been updated in this timeframe that is causing the issue
any help is greatly appreciated as many btsync "servers" are mourning at the moment

[brokenpipe]

Same issues here after the latest updates. Unfortunately didn't keep the old packages in cache. Are there any servers with older versions of the packages?

[MixedBeef]

Finally I've got it running!

Just download the alternative binary armhf and it should work. I verified that on my armv7 machine and it works fine.

[moonman]

You might wanna let the package maintainer know in AUR to use armhf source for armv7h/6h

[zifnab]

- works for armv7h (cubox-i4pro here)
- still doesn't work for armv6h (raspberry pi 1)

[moonman]

Armhf might be compiled for armv7 only. Too bad they only provide binaries and no sourcecode

[MixedBeef]

But there is one thing I don't understand: why did it work the last couple of months without any modifications or alternative binaries and now, since one week, it stopped working? What for an Arch update broke the compatibility and especially why?

[mpyth]

I've been having the same problem on my B+, and I've narrowed it down to glibc-2.23-4 (and maybe gcc-libs-6.1.1-1). I've been stepping through the updates one at a time, and trying ./btsync --help. It worked until I installed glibc. I haven't tried it with gcc-libs yet, but that's next.

I can't give you a definite 'why' answer, but my guess is that some new 'feature' in glibc breaks the btsync build for arm6. If we could re-compile the btsync binary, it would give us the specifics, but that's not an option.

[brokenpipe]

glibc causes the error because it was built with a newer toolchain than the btsync binary