.
Thread 3 (process 1878):
#0  0xb7795424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb73e3e96 in *__GI___poll (fds=0xa2e9098, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:87
	resultvar = <value optimized out>
	oldtype = -516
	result = <value optimized out>
#2  0xffffffff in ?? ()
No symbol table info available.
#3  0x89fffff0 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
.
Thread 2 (process 1739):
#0  0xb7795424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb73e3e96 in *__GI___poll (fds=0x9d82690, nfds=3, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:87
	resultvar = <value optimized out>
	oldtype = -516
	result = <value optimized out>
#2  0xffffffff in ?? ()
No symbol table info available.
#3  0x89fffff0 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
.
Thread 1 (process 1731):
#0  0xb738e4d2 in malloc_consolidate (av=0xb0d00010) at arena.c:275
	fb = (mfastbinptr *) 0xb0d0001c
	maxfb = (mfastbinptr *) 0xb0d0003c
	p = (mchunkptr) 0xaa7dc898
	nextp = (mchunkptr) 0x30
	unsorted_bin = (mchunkptr) 0xb0d00040
	first_unsorted = <value optimized out>
	nextchunk = (mchunkptr) 0x54fb9140
	size = 2860370088
	nextsize = <value optimized out>
	prevsize = <value optimized out>
	nextinuse = <value optimized out>
	bck = <value optimized out>
	fwd = <value optimized out>
	__func__ = "malloc_consolidate"
#1  0xb738fa8a in _int_free (av=<value optimized out>, p=0xaa6da1e0)
    at arena.c:275
	size = 78928
	fb = <value optimized out>
	nextchunk = (mchunkptr) 0xaa6ed630
	nextsize = 104
	nextinuse = <value optimized out>
	prevsize = <value optimized out>
	bck = <value optimized out>
	fwd = <value optimized out>
	errstr = Unhandled dwarf expression opcode 0x9f