steemd crashes with Assertion `std::current_exception() == std::exception_ptr()' failed

[chriswhocodes]

Every few days my steemd will crash with the following line at the end of the log file:

steemd: /home/steem/s2/steem/libraries/fc/src/thread/thread_d.hpp:372: bool fc::thread_d::start_next_fiber(bool): Assertion `std::current_exception() == std::exception_ptr()' failed.

Happens on multiple VPS servers running various plugins.

Systems are all Ubuntu 16.04:

Linux seed 4.4.0-87-generic #110-Ubuntu SMP Tue Jul 18 12:55:35 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux```

libc:
ii  libc6:amd64                            2.23-0ubuntu9                              amd64        GNU C Library: Shared libraries
ii  libc6-dev:amd64                        2.23-0ubuntu9                              amd64        GNU C Library: Development Libraries and Header Files

Codebase was head of git cloned 30th Aug 2017.

Thanks.

[mvandeberg]

A few points:

• Are you using one of our Docker images? This is the first report I have seen of this assertion failing. It is possible a different version of a dependency is causing this behavior.

• We will be moving away from fc cooperative multitasking over the coming months, so I am hesitant to fix this unless I receive more similar bug reports.

• Because it is an assertion failing, steemd will not crash if you build a release. -DCMAKE_BUILD_TYPE=Release. However, if there is a bug here, you may encounter crashes from undefined behavior elsewhere.

[chriswhocodes]

Hi,
No, built from source, not a Docker image.
Looks like someone also reported this on the graphene project back in 2015: cryptonomex/graphene#332

It's minor and I have a restart script for the witness, feel free to wontfix if you like :)

[mvandeberg]

We have chosen to move away from fc threading. Closing, won't fix.