Ah, ok! Thanks for clearing that up Rasmus! :o) And thanks again everyone for helping out. Everything runs fine for me now!
Best Regards Stefan Nilsson On Wed, Jan 3, 2018 at 11:09 AM, Rasmus Villemoes < rasmus.villem...@prevas.dk> wrote: > On 2018-01-03 01:13, Steffe - wrote: > > > I tested now with s6-rc version 0.3.0.0 and skalibs 2.6.0.1 and the > SIGFPE > > is gone. If I just run everything it seems to work OK. But when I tried > to > > run it through Valgrind I did get an assert, but I don't know if that > might > > be related to valgrind or not. The output is here: > > http://steffe.net/s6/valgrind_skalib_2.6.0.1.txt > > That's unrelated to s6. Incidentally, that assert() in glibc was > introduced by me, but it is wrong in case the newly spawned process is > killed by somebody sending random signal to random pids (nobody knows > the pid of the new process until the parent runs, which it won't do > until the child has actually made the assertion true, so nobody has any > business sending a signal that way). Anyway, the assert has since been > removed, but that probably hasn't made it to a release yet. > > Normally, you'd never trigger this assert except for the > sending-lethal-signals-to-random-pids. However, valgrind's clone() > replacement doesn't support the CLONE_* combination used to implement > posix_spawn (sharing memory between parent and child, yet being > different processes), so the assert() will trigger consistently for any > program using posix_spawn and a recent enough glibc. I'm not sure > whether valgrind works after the assert has been removed - it's possible > that it works fine in the normal case where all the spawn actions and > the execve succeed, but in case the child needs to report an error (e.g. > simply execve failing with ENOENT), that error reporting won't work > under valgrind. > > In case you want to debug skaware programs under valgrind and are stuck > with glibc 2.26, I think you should be able to simply update the sysdeps > to pretend posix_spawn is not available. > > Rasmus >
