This is the mail archive of the gdb-prs@sourceware.org mailing list for the GDB project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

[Bug gdb/19676] gdb fails with assert error if /proc is not mounted


https://sourceware.org/bugzilla/show_bug.cgi?id=19676

--- Comment #8 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The gdb-7.11-branch branch has been updated by Pedro Alves
<palves@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=4e57eb7028442f0e771c815d755b64daf7394e68

commit 4e57eb7028442f0e771c815d755b64daf7394e68
Author: Pedro Alves <palves@redhat.com>
Date:   Tue Mar 15 16:33:04 2016 +0000

    Fix PR gdb/19676: Disable displaced stepping if /proc not mounted

    On GNU/Linux archs that support displaced stepping, if /proc is not
    mounted, GDB gets stuck not able to step past breakpoints:

     (gdb) c
     Continuing.
     dl_main (phdr=<optimized out>, phnum=<optimized out>,
user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:2163
     2163      LIBC_PROBE (init_complete, 2, LM_ID_BASE, r);
     Cannot find AT_ENTRY auxiliary vector entry.
     (gdb) c
     Continuing.
     dl_main (phdr=<optimized out>, phnum=<optimized out>,
user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:2163
     2163      LIBC_PROBE (init_complete, 2, LM_ID_BASE, r);
     Cannot find AT_ENTRY auxiliary vector entry.
     (gdb)

    That's because GDB can't figure out where the scratch pad is.

    This is a regression introduced by the earlier changes to make the
    Linux native target always work in non-stop mode.

    This commit makes GDB detect the case and fallback to stepping over
    breakpoints in-line.

    gdb/ChangeLog:
    2016-03-15  Pedro Alves  <palves@redhat.com>

        PR gdb/19676
        * infrun.c (displaced_step_prepare): Also disable displaced
        stepping on NOT_SUPPORTED_ERROR.
        * linux-tdep.c (linux_displaced_step_location): If reading auxv
        fails, throw NOT_SUPPORTED_ERROR instead of generic error.

-- 
You are receiving this mail because:
You are on the CC list for the bug.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]