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[Bug gdb/15828] New: GDB crashed during process attachment when that process was dumping its own core due to a fault


http://sourceware.org/bugzilla/show_bug.cgi?id=15828

            Bug ID: 15828
           Summary: GDB crashed during process attachment when that
                    process was dumping its own core due to a fault
           Product: gdb
           Version: 7.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: jaydesh9 at gmail dot com

While attaching GDB to already running process with -p option, gdb crashed as ,
corresponding process was in the middle of its own crash .




Reading symbols from /lib64/libpthread.so.0...(no debugging symbols found).    
                                                                             
..done.

warning: td_ta_new failed: generic error

warning: td_ta_new failed: generic error

warning: Unable to find libthread_db matching inferior's thread library, th    
                                                                             
read debugging will not be available.
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done    
                                                                              .
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols fo    
                                                                             
und)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib64/libcxgb3-rdmav2.so...done.
Loaded symbols for /usr/lib64/libcxgb3-rdmav2.so
Reading symbols from /usr/lib64/libmthca-rdmav2.so...done.
Loaded symbols for /usr/lib64/libmthca-rdmav2.so
Reading symbols from /usr/lib64/libnes-rdmav2.so...done.
Loaded symbols for /usr/lib64/libnes-rdmav2.so
Reading symbols from /usr/lib64/libmlx4-rdmav2.so...done.
Loaded symbols for /usr/lib64/libmlx4-rdmav2.so
Reading symbols from /usr/lib64/libmlx4-m-rdmav2.so...done.
Loaded symbols for /usr/lib64/libmlx4-m-rdmav2.so
Cannot access memory at address 0x7f0bff1eb188

warning: td_ta_new failed: generic error

warning: td_ta_new failed: generic error

warning: Unable to find libthread_db matching inferior's thread library, th    
                                                                             
read debugging will not be available.
Failed to read a valid object file image from memory.
0x00007f0bf4e85f95 in pthread_join () from /lib64/libpthread.so.0
(gdb) c
Continuing.
0x00007f0bf4e85f95 in pthread_join () from /lib64/libpthread.so.0
ptrace: No such process.
(gdb) c
Continuing.
0x00007f0bf4e85f95 in pthread_join () from /lib64/libpthread.so.0
ptrace: No such process.
(gdb) c
Continuing.
0x00007f0bf4e85f95 in pthread_join () from /lib64/libpthread.so.0
ptrace: No such process.
(gdb) q
A debugging session is active.

        Inferior 1 [process 11892] will be detached.

Quit anyway? (y or n) n
Not confirmed.
(gdb) q
A debugging session is active.

        Inferior 1 [process 11892] will be detached.

Quit anyway? (y or n) y
[process 11892 exited]

linux-nat.c:1766: internal-error: linux_nat_detach: Assertion `num_lwps (GE    
                                                                             
T_PID (inferior_ptid)) == 1' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

linux-nat.c:1766: internal-error: linux_nat_detach: Assertion `num_lwps (GE    
                                                                             
T_PID (inferior_ptid)) == 1' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y

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