#4993: getDirectoryContents goes into an infinite loop -----------------------+---------------------------------------------------- Reporter: bos | Owner: Type: bug | Status: new Priority: normal | Component: libraries/directory Version: 7.0.1 | Keywords: Testcase: | Blockedby: Os: Linux | Blocking: Architecture: x86 | Failure: Runtime crash -----------------------+---------------------------------------------------- This is a really peculiar bug. Prepare for some fun!
I'm using a tool called boxgrinder to create a virtual machine image for running in Amazon's EC2 compute environment. The virtual machine is intended to contain GHC and a few libraries. I'm running boxgrinder itself in an EC2 virtual machine. boxgrinder works fine on a 64-bit virtual machine, when creating a 64-bit virtual machine, but gets stuck forever when I try to run it in a 32-bit VM to create a 32-bit image. The reason for boxgrinder hanging is that when installing {{{GHC}}}, {{{ghc-pkg}}} is going into an infinite loop. I've got a super simple reproduction: {{{ import System.Directory main = getDirectoryContents "." >>= print }}} If compiled, the above command runs fine in the regular 32-bit system image, but not in the {{{chroot}}} filesystem created by boxgrinder. In there, it goes into an infinite loop right after reading some of the directory contents: {{{ ... everything looks normal ... open(".", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 3 getdents64(3, /* 25 entries */, 32768) = 640 getdents64(3, /* 0 entries */, 32768) = 0 --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- sigreturn() = ? (mask now []) ... and no more life! ... }}} I have verified that this infinite loop occurs both with 6.12.3 and 7.0.2 RC2. Investigating further at the moment. -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4993> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs