SystemError: flush: Bad file descriptor on Travis but not on local machine

[JockLawrie]

Hi there,

I am running the tests for LoggedDicts.jl, which uses Logging.jl as a dependency. On my local machine everything works well, but on Travis I consistently get the error: SystemError: flush: Bad file descriptor

Oddly, the error occurs on a line that is called several times without issue earlier in the test suite. The failure consistently occurs at the same call site (line 44 of test/runtests.jl).

It is unclear if this is a Logging.jl issue, a Travis issue or something that I'm doing wrong.
Have you seen this problem before?

Regards,
Jock

[kmsquire]

Hi, Thanks for reporting. I haven't run across this, and I don't know what the problem is off hand. I'll try to take a look, but not sure how soon. If you discover anything about it, please post back!

Link with an example from LoggedDicts.jl: https://travis-ci.org/JockLawrie/LoggedDicts.jl/jobs/120814199#L160-L168.

[kmsquire]

Okay, a small hint: the only flush function is here. It might be that the file descriptor you're writing to (is it a file?) can't be created on travis with your current setup, or that whatever you're writing to doesn't exist on travis. Maybe that provides enough hints for digging into it more?

[JockLawrie]

The curious thing is that each call to set!, pop!, push! and delete! calls info(), which then writes to the log file. This all goes without a hitch until the end of runtests.jl. That is, the error is raised only when info() is called for the 9th time.

The only thing I can think of is that the log file is closed by some Travis setting...but then surely the test suite from Logging.jl would have encountered this problem. So I'm stumped.

[JockLawrie]

New fact: Commenting out writes (not logs) to other files passes on Linux
but still fails on OSX. Not being a Mac user, I have no idea why.

On 6 April 2016 at 13:18, Kevin Squire [email protected] wrote:

Okay, a small hint: the only flush function is here
https://github.com/kmsquire/Logging.jl/blob/master/src/Logging.jl#L74.
It might be that the file descriptor you're writing to (is it a file?)
can't be created on travis with your current setup, or that whatever you're
writing to doesn't exist on travis. Maybe that provides enough hints for
digging into it more?

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#39 (comment)

[JockLawrie]

Now passing on OSX - no issue, it just stopped so I restarted it.

So the problem seems related to writing to a stream not using Logging.jl
while also writing to a log file using Logging.jl.
The difficulty is that it reproduces on Travis, but not on my local Debian
machine.

On 6 April 2016 at 14:53, Jock Lawrie [email protected] wrote:

New fact: Commenting out writes (not logs) to other files passes on Linux
but still fails on OSX. Not being a Mac user, I have no idea why.

On 6 April 2016 at 13:18, Kevin Squire [email protected] wrote:

Okay, a small hint: the only flush function is here
https://github.com/kmsquire/Logging.jl/blob/master/src/Logging.jl#L74.
It might be that the file descriptor you're writing to (is it a file?)
can't be created on travis with your current setup, or that whatever you're
writing to doesn't exist on travis. Maybe that provides enough hints for
digging into it more?

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You are receiving this because you authored the thread.
Reply to this email directly or view it on GitHub
#39 (comment)