[Bug breakpoints/16812] New: SIGSEGV running program after using dprintf-style call and -dprintf-insert

[Bug breakpoints/16812] New: SIGSEGV running program after using dprintf-style call and -dprintf-insert

[malaperle at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

            Bug ID: 16812
           Summary: SIGSEGV running program after using dprintf-style call
                    and -dprintf-insert
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: malaperle at gmail dot com

Using gdb 7.7 on Ubuntu 13.10 64 bit.

gdb test -i mi
(gdb) 
-gdb-set dprintf-style call
^done
(gdb) 
-dprintf-insert test.cpp:13 "hello"
^done,bkpt={number="1",type="dprintf",disp="keep",enabled="y",addr="0x0000000000400861",func="main()",file="../src/test.cpp",fullname="/home/mark/Documents/dev/eclipse-4.4/workspace/test/src/test.cpp",line="13",thread-groups=["i1"],times="0",script={"call
(void) printf (\"hello\")"},original-location="test.cpp:13"}
(gdb) 
r
&"r\n"
~"Starting program:
/home/mark/Documents/dev/eclipse-4.4/workspace/test/Debug/test \n"
=thread-group-started,id="i1",pid="8685"
=thread-created,id="1",group-id="i1"
^running
...

=library-loaded,id="/lib/x86_64-linux-gnu/libgcc_s.so.1",target-name="/lib/x86_64-linux-gnu/libgcc_s.so.1",host-name="/lib/x86_64-linux-gnu/libgcc_s.so.1",symbols-loaded="0",thread-group="i1"
=breakpoint-modified,bkpt={number="1",type="dprintf",disp="keep",enabled="y",addr="0x0000000000400861",func="main()",file="../src/test.cpp",fullname="/home/mark/Documents/dev/eclipse-4.4/workspace/test/src/test.cpp",line="13",thread-groups=["i1"],times="0",script={"call
(void) printf (\\"hello\\")"},original-location="test.cpp:13"}
=breakpoint-modified,bkpt={number="1",type="dprintf",disp="keep",enabled="y",addr="0x0000000000400861",func="main()",file="../src/test.cpp",fullname="/home/mark/Documents/dev/eclipse-4.4/workspace/test/src/test.cpp",line="13",thread-groups=["i1"],times="1",script={"call
(void) printf (\\"hello\\")"},original-location="test.cpp:13"}
~"\nProgram terminated with signal "
~"SIGSEGV, Segmentation fault.\n"
~"The program no longer exists.\n"
=thread-exited,id="1",group-id="i1"
=thread-group-exited,id="i1"
*stopped
Aborted (core dumped)


The core dump doesn't seem very helpful:
Core was generated by
`/home/mark/Documents/dev/eclipse-4.4/workspace/test/Debug/test'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007fffffffddff in ?? ()
(gdb) bt
#0  0x00007fffffffddff in ?? ()
#1  0x0000000000601060 in data_start ()
#2  0xcc007ffff774a358 in ?? ()
#3  0x0000000000000001 in ?? ()
#4  0x00007fffffffde30 in ?? ()
#5  0x0000000000600df8 in ?? ()
#6  0x00000000004008bf in __static_initialization_and_destruction_0
(__initialize_p=32767, __priority=-8728)
    at /usr/include/c++/4.8/iostream:74
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

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[Bug breakpoints/16812] SIGSEGV running program after using dprintf-style call and -dprintf-insert

[malaperle at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

--- Comment #1 from Marc-Andre Laperle <malaperle at gmail dot com> ---
Created attachment 7537
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7537&action=edit
test source file

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[Bug breakpoints/16812] SIGSEGV running program after using dprintf-style call and -dprintf-insert

[malaperle at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

Marc-Andre Laperle <malaperle at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marc.khouzam at ericsson dot com

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[Bug breakpoints/16812] SIGSEGV running program after using dprintf-style call and -dprintf-insert

[simon.marchi at polymtl dot ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

Simon Marchi <simon.marchi at polymtl dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |simon.marchi at polymtl dot ca

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[Bug breakpoints/16812] SIGSEGV running program after using dprintf-style call and -dprintf-insert

[malaperle at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

--- Comment #2 from Marc-Andre Laperle <malaperle at gmail dot com> ---
I'm sorry, I have to rectify the steps to reproduce the bug. I had a .gdbinit
file in my home directory that affected the behavior. Here are the correct
steps:

(gdb) 
handle SIGSEGV nostop noprint
&"handle SIGSEGV nostop noprint\n"
~"Signal        Stop\tPrint\tPass to program\tDescription\n"
~"SIGSEGV       No\tNo\tYes\t\tSegmentation fault\n"
^done
(gdb) 
-gdb-set dprintf-style call
^done
(gdb) 
-dprintf-insert test.cpp:13 "hello"
^done,bkpt={number="1",type="dprintf",disp="keep",enabled="y",addr="0x0000000000400861",func="main()",file="test.cpp",fullname="/home/emalape/git/gdb-7.7/install/bin/test.cpp",line="13",thread-groups=["i1"],times="0",script={"call
(void) printf (\"hello\")"},original-location="test.cpp:13"}
(gdb) 
r
&"r\n"
~"Starting program: /home/emalape/git/gdb-7.7/install/bin/test \n"
=thread-group-started,id="i1",pid="28110"
=thread-created,id="1",group-id="i1"
^running
...
=library-loaded,id="/lib/x86_64-linux-gnu/libgcc_s.so.1",target-name="/lib/x86_64-linux-gnu/libgcc_s.so.1",host-name="/lib/x86_64-linux-gnu/libgcc_s.so.1",symbols-loaded="0",thread-group="i1"
=breakpoint-modified,bkpt={number="1",type="dprintf",disp="keep",enabled="y",addr="0x0000000000400861",func="main()",file="test.cpp",fullname="/home/emalape/git/gdb-7.7/install/bin/test.cpp",line="13",thread-groups=["i1"],times="0",script={"call
(void) printf (\\"hello\\")"},original-location="test.cpp:13"}
=breakpoint-modified,bkpt={number="1",type="dprintf",disp="keep",enabled="y",addr="0x0000000000400861",func="main()",file="test.cpp",fullname="/home/emalape/git/gdb-7.7/install/bin/test.cpp",line="13",thread-groups=["i1"],times="1",script={"call
(void) printf (\\"hello\\")"},original-location="test.cpp:13"}
~"\nProgram terminated with signal "
~"SIGSEGV, Segmentation fault.\n"
~"The program no longer exists.\n"
=thread-exited,id="1",group-id="i1"
=thread-group-exited,id="i1"
*stopped
Aborted



If only nostop is used then it works correctly:
handle SIGSEGV nostop

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[Bug breakpoints/16812] SIGSEGV running program after using dprintf-style call and -dprintf-insert

[antoine.tremblay at ericsson dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

Antoine Tremblay <antoine.tremblay at ericsson dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |antoine.tremblay at ericsson dot c
                   |                            |om
           Assignee|unassigned at sourceware dot org   |antoine.tremblay at ericsson dot c
                   |                            |om

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[Bug breakpoints/16812] SIGSEGV running program after using dprintf-style call and -dprintf-insert

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Antoine Tremblay <hexa@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c9587f88230e9df836f17c195181aaf50c3a1117

commit c9587f88230e9df836f17c195181aaf50c3a1117
Author: Antoine Tremblay <antoine.tremblay@ericsson.com>
Date:   Thu Feb 12 14:55:08 2015 -0500

    Fix non executable stack handling when calling functions in the inferior.

    When gdb creates a dummy frame to execute a function in the inferior,
    the process may generate a SIGSEGV, SIGTRAP or SIGILL because the stack
    is non executable. If the signal handler set in gdb has option print
    or stop enabled for these signals gdb handles this correctly.

    However, in the case of noprint and nostop the signal is short-circuited
    and the inferior process is sent the signal directly. This causes the
    inferior to crash because of gdb.

    This patch adds a check for SIGSEGV, SIGTRAP or SIGILL so that these
    signals are sent to gdb rather than short-circuited in the inferior.
    gdb then handles them properly and the inferior process does not
    crash.

    This patch also fixes the same behavior in gdbserver.

    Also added a small testcase to test the issue called
catch-gdb-caused-signals.

    This applies to Linux only, tested on Linux.

    gdb/ChangeLog:
        PR breakpoints/16812
        * linux-nat.c (linux_nat_filter_event): Report SIGTRAP,SIGILL,SIGSEGV.
        * nat/linux-ptrace.c (linux_wstatus_maybe_breakpoint): Add.
        * nat/linux-ptrace.h: Add linux_wstatus_maybe_breakpoint.

    gdb/gdbserver/ChangeLog:
        PR breakpoints/16812
        * linux-low.c (wstatus_maybe_breakpoint): Remove.
        (linux_low_filter_event): Update wstatus_maybe_breakpoint name.
        (linux_wait_1): Report SIGTRAP,SIGILL,SIGSEGV.

    gdb/testsuite/ChangeLog:
        PR breakpoints/16812
        * gdb.base/catch-gdb-caused-signals.c: New file.
        * gdb.base/catch-gdb-caused-signals.exp: New file.

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[Bug breakpoints/16812] SIGSEGV running program after using dprintf-style call and -dprintf-insert

[antoine.tremblay at ericsson dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

Antoine Tremblay <antoine.tremblay at ericsson dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
           Severity|normal                      |enhancement

--- Comment #4 from Antoine Tremblay <antoine.tremblay at ericsson dot com> ---
Fixed by c9587f88230e9df836f17c195181aaf50c3a1117

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[Bug breakpoints/16812] SIGSEGV running program after using dprintf-style call and -dprintf-insert

[palves at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16812

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |Claude at renegat dot net

--- Comment #5 from Pedro Alves <palves at redhat dot com> ---
*** Bug 17970 has been marked as a duplicate of this bug. ***

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