$ ./mongod --version
Illegal instruction
$ gdb mongod
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Reading symbols from mongod...
(gdb) b main
Breakpoint 1 at 0x1256d20: main. (6 locations)
(gdb) r --version
Starting program: /home/mzch/mongo/build/install/bin/mongod --version
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Program received signal SIGILL, Illegal instruction.
tcmalloc::SizeMap::Init (this=this@entry=0x55555a8087a0 <tcmalloc::Static::sizemap_>)
    at src/third_party/gperftools/dist/src/common.cc:319319
     num_objects_to_move_[cl] = NumMoveSize(ByteSizeForClass(cl));
(gdb) p cl
$1 = 1
(gdb) s
Program received signal SIGILL, Illegal instruction.
tcmalloc::SizeMap::NumMoveSize (size=<optimized out>, this=<optimized out>)
    at src/third_party/gperftools/dist/src/common.cc:181181
 int SizeMap::NumMoveSize(size_t size) {
(gdb) p size
$2 = <optimized out>
(gdb) s
Program received signal SIGILL, Illegal instruction.
0x00005555592318dc in tcmalloc::SizeMap::NumMoveSize (this=<optimized out>, size=<optimized out>)
    at src/third_party/gperftools/dist/src/common.cc:197197
   if (num > FLAGS_tcmalloc_transfer_num_objects)
(gdb) p num
$3 = <optimized out>
(gdb) p FLAGS_tcmalloc_transfer_num_objects
$4 = 32
(gdb) s
Program terminated with signal SIGILL, Illegal instruction.
The program no longer exists.
(gdb)