http://llvm.org/bugs/show_bug.cgi?id=12152
Bug #: 12152
Summary: some piped commands hang infinitely when input pipe is
broken/terminated
Product: new-bugs
Version: trunk
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
gtimeout 5m /Users/fang/local/src/LLVM-svn/gcc40-cmake-build/bin/./clang -cc1
-internal-isystem
/Volumes/Isolde/builds/LLVM/gcc40-cmake-build/bin/../lib/clang/3.1/include
/Users/fang/local/src/LLVM-svn/clang/test/CodeGen/2006-01-13-StackSave.c
-emit-llvm -o - | opt -std-compile-opts | llvm-dis | grep llvm.stacksave
When the built clang times out (reason not yet known), the opt program seems to
hang on an infinite loop.
Perhaps there's a missing check for input stream state somewhere, and it's
trying to read from a closed pipe infinitely?
Looks like culprit of several tests is hanging 'opt'.
Such failures plague TONS of CodeGen tests on powerpc-darwin8, which is now
seeing a lot more timeouts on clang than before, indicating possible infinite
looping.
possible workaround might be to attempt to 'timeout' every piped command, but
that requires hacking more than the lit dispatcher test scripts.
These tests were last known to run to completion with r150570, current version
tested is r151632.
To reproduce, trying running a test with sufficiently long input piping into
opt, and kill the input pipe, or time it out.
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