#3874: GHC.Exts.traceEvent segfaults
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Reporter: cjs | Owner: igloo
Type: merge | Status: closed
Priority: high | Milestone: 6.12.2
Component: Runtime System | Version: 6.12.1
Resolution: fixed | Keywords: event, eventlog
Operating System: Linux | Architecture: x86_64 (amd64)
Type of failure: Runtime crash | Test Case:
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Comment (by Austin Seipp ):
In [changeset:"a82364c9410d35fa9cb5031d553212267c3628c5/ghc"]:
{{{
#!CommitTicketReference repository="ghc"
revision="a82364c9410d35fa9cb5031d553212267c3628c5"
Don't truncate traceEvents to 512 bytes (#8309)
Summary:
Don't call postLogMsg to post a user msg, because it truncates messages to
512 bytes.
Rename traceCap_stderr and trace_stderr to vtraceCap_stderr and
trace_stderr,
to signal that they take a va_list (similar to vdebugBelch vs debugBelch).
See #3874 for the original reason behind traceFormatUserMsg.
See the commit msg in #9395 (d360d440) for a discussion about using
null-terminated strings vs strings with an explicit length.
Test Plan:
Run `cabal install ghc-events` and inspect the result of `ghc-events show`
on
an eventlog file created with `ghc -eventlog Test.hs` and `./Test +RTS
-l`,
where Test.hs contains:
```
import Debug.Trace
main = traceEvent (replicate 510 'a' ++ "bcd") $ return ()
```
Depends on D655.
Reviewers: austin
Reviewed By: austin
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D656
GHC Trac Issues: #8309
}}}
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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/3874#comment:9
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