Description:
------------
We have been noticed that our PHP gearman daemon periodically fails with segmentation fault. Yesterday it started to fail on each task coming from queue. 
Fault appears somewhere in GearmanWorker::work() function.
Core analysis says:

Program terminated with signal 11, Segmentation fault.
[New process 88489    ]
#0  gearman_real_malloc (allocator=@0x858, size=342, 
    func=0xffff80ffb8d4411f "receiving", 
    file=0xffff80ffb8d45c34 "libgearman/connection.cc", 
    line=1037) at libgearman/allocator.cc:52
52	  if (allocator.malloc)


After increasing worker timeout from 10ms to 1000ms problem was gone.

Why 10ms? This is default hardcoded timeout in composer package sinergi/gearman.

Reproduced in:
PHP 5.4.42 + gearman 1.1.2
PHP 5.6.6 + gearman 1.1.2

Expected result:
----------------
At least an exception throwed from library if timeout is too low to process jobs

Actual result:
--------------
Segmentation fault

Program terminated with signal 11, Segmentation fault.
[New process 88489    ]
#0  gearman_real_malloc (allocator=@0x858, size=342, 
    func=0xffff80ffb8d4411f "receiving", 
    file=0xffff80ffb8d45c34 "libgearman/connection.cc", 
    line=1037) at libgearman/allocator.cc:52
52	  if (allocator.malloc)