[Bug gdb/16818] New: GDB crashes when using name for target remote hostname:port

[Bug gdb/16818] New: GDB crashes when using name for target remote hostname:port

[bruce.fleming at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

            Bug ID: 16818
           Summary: GDB crashes when using name for target remote
                    hostname:port
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: critical
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: bruce.fleming at gmail dot com

GDB generates a SIGSEGV whenever target remote hostname:port command is used
(either in .gdbinit or by command).  Tracked this down to what appears to be a
namespace conflict for timeval_add.  Stack trace inserted below.  There is a
global symbol in libsamba-util.so.0 (timeval_add) and also in libiberty which
is part of GDB.  This is version Fedora 7.6.1-46.fc19.

[fc19 gdb-7.6.1]$ readelf -s /lib64/libsamba-util.so.0 | grep timeval_add
   326: 0000003d78a0f0a0    59 FUNC    GLOBAL DEFAULT   12
timeval_add@@SAMBA_UTIL_0.0.1
[fc19 gdb-7.6.1]$ readelf -s /lib64/libsamba-util.so.0 | grep
timeval_current_ofs
   231: 0000003d78a0f130    63 FUNC    GLOBAL DEFAULT   12
timeval_current_ofs_msec@@SAMBA_UTIL_0.0.1
   343: 0000003d78a0f100    43 FUNC    GLOBAL DEFAULT   12
timeval_current_ofs@@SAMBA_UTIL_0.0.1
   691: 0000003d78a0f170    59 FUNC    GLOBAL DEFAULT   12
timeval_current_ofs_usec@@SAMBA_UTIL_0.0.1


#0  timeval_add (result=0x7fffffffd850, a=0x0, b=0x3d090) at
../../libiberty/timeval-utils.c:57
#1  0x0000003d78a0f124 in timeval_current_ofs () from /lib64/libsamba-util.so.0
#2  0x0000003d71e12b84 in name_query () from /usr/lib64/samba/libgse.so
#3  0x00007ffff0d3d489 in _nss_wins_gethostbyname_r () from
/lib64/libnss_wins.so.2
#4  0x0000003d3ad0ebd3 in gethostbyname_r@@GLIBC_2.2.5 () from /lib64/libc.so.6
During symbol reading, Child DIE 0xa7383 and its abstract origin 0xa7e56 have
different tags.
During symbol reading, Child DIE 0xa7383 and its abstract origin 0xa7e56 have
different parents.
#5  0x0000003d3ad0e316 in gethostbyname () from /lib64/libc.so.6
#6  0x000000000047d69a in net_open (scb=0xdb30d0, name=<optimized out>) at
../../gdb/ser-tcp.c:194
During symbol reading, cannot get low and high bounds for subprogram DIE at
1217621.
During symbol reading, Multiple children of DIE 0x12ba07 refer to DIE 0x129485
as their abstract origin.
During symbol reading, DW_AT_GNU_call_site_target target DIE has invalid low
pc, for referencing DIE 0x12efd3 [in module
/home/bruce/rpmbuild/BUILD/gdb-7.6.1/build-x86_64-redhat-linux/gdb/gdb].
#7  0x0000000000637f04 in serial_open (name=<optimized out>,
name@entry=0xc2219e "office:1234") at ../../gdb/serial.c:221
#8  0x00000000004a3eac in remote_serial_open (name=0xc2219e "hdev:1234") at
../../gdb/remote.c:3712
#9  remote_open_1 (name=<optimized out>, from_tty=0, target=0xb22160
<remote_ops>, extended_p=0) at ../../gdb/remote.c:4257
#10 0x000000000064127a in execute_command (p=0xc221a8 "4", p@entry=0xc22190
"target remote office:1234", from_tty=0) at ../../gdb/top.c:487
#11 0x0000000000641efb in command_loop () at ../../gdb/top.c:590
#12 0x0000000000641fb9 in read_command_file (stream=stream@entry=0xcd51a0) at
../../gdb/top.c:330
#13 0x00000000004bcc42 in script_from_file (stream=stream@entry=0xcd51a0,
file=file@entry=0xd48860 "/home/bruce/.gdbinit") at
../../gdb/cli/cli-script.c:1654
#14 0x00000000004bd366 in source_script_from_stream (stream=0xcd51a0,
file=0xd48860 "/home/bruce/.gdbinit") at ../../gdb/cli/cli-cmds.c:545
#15 0x00000000004bf04f in source_script_with_search (file=0xd48860
"/home/bruce/.gdbinit", from_tty=<optimized out>, search_path=0)
    at ../../gdb/cli/cli-cmds.c:582
#16 0x0000000000584a2e in catch_command_errors (command=0x4bf170
<source_script>, arg=0xd48860 "/home/bruce/.gdbinit",
from_tty=from_tty@entry=0, 
    mask=mask@entry=6) at ../../gdb/exceptions.c:573
#17 0x000000000058773f in captured_main (data=data@entry=0x7fffffffe010) at
../../gdb/main.c:958
#18 0x000000000058495a in catch_errors (func=func@entry=0x586430
<captured_main>, func_args=func_args@entry=0x7fffffffe010, 
    errstring=errstring@entry=0x7207cb "", mask=mask@entry=6) at
../../gdb/exceptions.c:546
#19 0x00000000005878d4 in gdb_main (args=args@entry=0x7fffffffe010) at
../../gdb/main.c:1144
#20 0x00000000004543de in main (argc=<optimized out>, argv=<optimized out>) at
../../gdb/gdb.c:34
(top-gdb)

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[Bug gdb/16818] GDB crashes when using name for target remote hostname:port

[bruce.fleming at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

bruce.fleming at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |UNCONFIRMED
     Ever confirmed|1                           |0

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[Bug gdb/16818] GDB crashes when using name for target remote hostname:port

[bruce.fleming at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

bruce.fleming at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-04-09
     Ever confirmed|0                           |1

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[Bug gdb/16818] GDB crashes when using name for target remote hostname:port

[palves at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |palves at redhat dot com

--- Comment #1 from Pedro Alves <palves at redhat dot com> ---
Interesting...  I wonder if there might be a general solution for this.  I
asked the glibc folks: https://sourceware.org/bugzilla/show_bug.cgi?id=16881

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[Bug gdb/16818] GDB crashes when using name for target remote hostname:port

[bruce.fleming at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

bruce.fleming at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bruce.fleming at gmail dot com

--- Comment #2 from bruce.fleming at gmail dot com ---
Hi Pedro,

>> There may be some amount of dlmopen() usage that we can do to ensure the 
>> implementation loaded modules are hidden from the user modules, but eventually 
>> the breakage will happen and the only solution is to alter the linkage scope 
>> (drawing a wall around things) or fix the symbols.

Looks like the they are passing the token back to the others to resolve.

Bruce

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[Bug gdb/16818] GDB crashes when using name for target remote hostname:port

[palves at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

--- Comment #3 from Pedro Alves <palves at redhat dot com> ---
Yeah.  Even if there were a good solution for this, there is still the issue
that we need to cope with existing systems.  So seems like the easiest is for
someone rename the libiberty function.   Note that libiberty is actually owned
by GCC.

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[Bug gdb/16818] GDB crashes when using name for target remote hostname:port

[bruce.fleming at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

--- Comment #4 from bruce.fleming at gmail dot com ---
Yes - I agree.  Since libiberty is owned by GCC, do we need to submit a new bug
there and reference this one?

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[Bug gdb/16818] GDB crashes when using name for target remote hostname:port

[palves at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

--- Comment #5 from Pedro Alves <palves at redhat dot com> ---
Sure.  I'd just suggest making sure the bug description is self contained
enough that GCC developers don't actually have to click through the gdb url to
understand the issue, otherwise, I suspect nobody will look at it.

Thanks.

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[Bug gdb/16818] GDB crashes when using name for target remote hostname:port

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16818

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ssbssa at sourceware dot org

--- Comment #10 from Hannes Domani <ssbssa at sourceware dot org> ---
(In reply to Sourceware Commits from comment #9)
> The master branch has been updated by Pedro Alves <palves@sourceware.org>:
> 
> https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;
> h=a4a1c15754d144d14dc48cd8ff62601f977e908c
> 
> commit a4a1c15754d144d14dc48cd8ff62601f977e908c
> Author: Pedro Alves <palves@redhat.com>
> Date:   Tue May 3 10:30:51 2016 +0100
> 
>     Fix PR gdb/16818, workaround Python's forcing of -export-dynamic

Can this be closed?

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