Is this bug still alive ? If so you may try this program on the frozen process. Simply compile with : cc survfutex.c -o survfutex And try survfutex -u -p {pid_of_frozen}. It uses ptrace(2) to attach process (just like strace does) then checks it is frozen on a sys_futex wait, then poke a 0 at the waiting address. This should warm up a bit ... What is the nature of your frozen process ? I experienced same trouble on program that uses "unsafe" function from a signal handler (free, fprintf, ...).
Cheers, -Rogers ** Attachment added: "sys_futex wait watcher and unfreezer." http://librarian.launchpad.net/6853960/survfutex.c -- [sparc] OOo build hangs in futex call https://launchpad.net/bugs/59537 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs