On Fri, Oct 7, 2016 at 4:08 PM, Lentes, Bernd <bernd.len...@helmholtz-muenchen.de> wrote: > > > ----- On Oct 7, 2016, at 3:59 PM, Eugene Syromyatnikov evg...@gmail.com wrote: > > >>> Starting a process give me this error in the log: >>> traps: nsrexecd[12162] general protection ip:7f085e4cb960 sp:7f085a4e9278 >>> error:0 in libpthread-2.23.so[7f085e4b9000+18000] >>> It seems that the kernel is stopping the process because of ... what with a >>> signal. >> For debugging segmentation faults, i'd recommend installing debuginfo >> packages, >> enabling core file saving and then checking them out with gdb, usually it >> allows >> pinpointing problem rather quickly. > > Is that a segmentation fault ? Well, I assume so by "general protection" message from your excerpt, which is printed when there is unhandled SIGSEGV, iirc.
> >> Clone is rather comprehensive syscall by means that it is used for several >> different tasks. Which arguments are used depends on flags provided, and >> strace >> prints only arguments actually used (for brevity, i suppose). Syscall >> arguments >> parsing for clone call is done as follows (clone.c in strace source): >> > > Ah. So clone is called with all arguments but strace shows just the relevant ? > Does strace have this behaviour also with other system calls ? Yes. futex, fcntl, prctl, quotact, keyctl, ptrace are examples of such syscalls. >>> What means the return code 13025 ? I didn't find anything about it in the >>> net. >>> Is there s.th. where i can get further information ? >> On success, clone returns ID of the child process to the parent. You can >> check >> it out in the "RETURN VALUE" section of the manual. >> > > Sorry, i didn't read completely. Because the return code was != 0, i thought > it's an error code. Some syscalls return positive values in case of success, mostly the ones which provide fd as a result, but there are other examples of such behaviour. Only negative value indicates an error (in all cases i'm aware of, at least). >>> I installed the kernel sources and searched for a file like clone.h or >>> clone.c, >>> but didn't find anything. >> Please check out kernel/fork.c file in kernel tree, it contains >> SYSCALL_DEFINE[56](clone, ...), which calls _do_fork(). >> > > I installed the debian-kerbel via apt. > But it didn't install it completely, just downloaded a tar which i need to > extract manually. > Why do i have a package management ? There is linux-source package available in Debian. You can also do apt-get source linux-image and obtain deb-src which would also contain kernel sources. > > Bernd > > > Helmholtz Zentrum Muenchen > Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) > Ingolstaedter Landstr. 1 > 85764 Neuherberg > www.helmholtz-muenchen.de > Aufsichtsratsvorsitzende: MinDir'in Baerbel Brumme-Bothe > Geschaeftsfuehrer: Prof. Dr. Guenther Wess, Dr. Alfons Enhsen > Registergericht: Amtsgericht Muenchen HRB 6466 > USt-IdNr: DE 129521671 > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Strace-devel mailing list > Strace-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/strace-devel -- Eugene "eSyr" Syromyatnikov mailto:evg...@gmail.com xmpp:eSyr@jabber.{ru|org} ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Strace-devel mailing list Strace-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/strace-devel
