[Bug threads/9817] New: GDB goes to 100% CPU usage indefinitely if pthread stack address is modified

["mihai dot stanescu at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

The particular thing about the program is that is doing a pthread_attr_setstack
to setup the thread stack to a dynamically allocated memory area on heap.

pthread_attr_setstack(&attr, alignedStackBase, THREAD_STACK_SIZE -
2*PTHREAD_STACK_MIN)

When attaching to an already running program (which uses pthreads) on
gentoo/x86, GDB loops indefinitely 

Here is a small dump from strace which goes forever

open("/proc/6204/mem", O_RDONLY|O_LARGEFILE) = 7
pread64(7,"\220{\237\266\220\r\253\27\220{\237\266\1\0\0\0\200\351\363\267\0\0\n\377,DRv\0\0\0\0"...,1136,
3063905168) = 1136
close(7) = 0
open("/proc/6204/mem", O_RDONLY|O_LARGEFILE) = 7
pread64(7,
"\220;\254\266\210\1\253\27\220;\254\266\1\0\0\0\200\351\363\267\0\0\n\377,DRv\0\0\0\0"...,1136,
3064740752) = 1136
close(7)                                = 0
open("/proc/6204/mem", O_RDONLY|O_LARGEFILE) = 7
pread64(7,"\220;\254\266\210\1\253\27\220;\254\266\1\0\0\0\200\351\363\267\0\0\n\377,DRv\0\0\0\0"...,1136,
3064740752) = 1136
close(7)                                = 0

-- 
           Summary: GDB goes to 100% CPU usage indefinitely if pthread stack
                    address is modified
           Product: gdb
           Version: 6.8
            Status: UNCONFIRMED
          Severity: normal
          Priority: P1
         Component: threads
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: mihai dot stanescu at gmail dot com
                CC: gdb-prs at sourceware dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=9817

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