Bug #18240: Random segfault on a local Rails server

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 3.0.2
• Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[Benoit_Tigeot (Benoit Tigeot)]

Hello

I am having random segfault locally when rails a basic rails app.

The control frame is weird:

| -- Control frame information -----------------------------------------------
web | c:0073 p:---- s:0470 e:000469 CFUNC :append_features
web | c:0072 p:---- s:0467 e:000466 CFUNC :include

[jeremyevans0 (Jeremy Evans)]

Unfortunately, I don't think there is enough information provided to help diagnose the specific cause of the issue (the general cause is likely to be memory corruption). The following 3rd party C-extensions are in use:

nio4r
bindex
byebug
stackprof
bcrypt
panko_serializer
oj
ffi
puma
pg
nokogiri
bootsnap
msgpack

A memory issue in any of those could cause a segfault in append_features. If it is possible to disable the use of all or most of the external C extensions and see if that makes that problem go away, that would be one way to go about diagnosing the problem.

[Benoit_Tigeot (Benoit Tigeot)]

Thanks Jeremy for your answer. We're gonna try to disable the C extensions one by one to identify if one behaves badly.

I think the ticket can be marked as closed, we will publish our result here.

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed