[Bug remote/16126] New: GDB/GDBserver lose signal when reconnecting

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16126

            Bug ID: 16126
           Summary: GDB/GDBserver lose signal when reconnecting
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: remote
          Assignee: unassigned at sourceware dot org
          Reporter: palves at redhat dot com

If you disconnect from GDBserver while the program is stopped at a signal
(or gdb crashes), and then connect back, GDB/GDBserver lose the signal.

Without reconnecting:

(gdb) c
Continuing.

Program received signal SIGUSR1, User defined signal 1.
main () at threads.c:35
35          long i = 0;

(gdb) info program 
Debugging a target over a serial line.
Program stopped at 0x4006e4.
It stopped with signal SIGUSR1, User defined signal 1.

(gdb) c
Continuing.

Program terminated with signal SIGUSR1, User defined signal 1.
The program no longer exists.
(gdb) 


==============================

Reconnecting:

(gdb) c
Continuing.

Program received signal SIGUSR1, User defined signal 1.
0x00000034cf408e60 in pthread_join (threadid=140737353922304,
thread_return=0x7fffffffd8b8) at pthread_join.c:93
93          lll_wait_tid (pd->tid);
(gdb) info program 
Debugging a target over a serial line.
Program stopped at 0x34cf408e60.
It stopped with signal SIGUSR1, User defined signal 1.

(gdb) disconnect 
Ending remote debugging.

(gdb) tar remote :9999
Remote debugging using :9999
Reading symbols from /lib64/libpthread.so.0...Reading symbols from
/usr/lib/debug/lib64/libpthread-2.15.so.debug...done.
...
Loaded symbols for /lib64/ld-linux-x86-64.so.2
0x00000034cf408e60 in pthread_join (threadid=140737353922304,
thread_return=0x7fffffffd8b8) at pthread_join.c:93
93          lll_wait_tid (pd->tid);

(gdb) info program 
Debugging a target over a serial line.
Program stopped at 0x34cf408e60.
It stopped with signal SIGTRAP, Trace/breakpoint trap.

(gdb) c
Continuing.
[Inferior 1 (process 25328) exited normally]

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