realloc return NULL

[hankai17]

#0 0x00002ab04102c207 in raise () from /lib64/libc.so.6
#1 0x00002ab04102da38 in abort () from /lib64/libc.so.6
#2 0x00002ab03ec48751 in ink_abort (message_format=0x2ab03ec5b010 "couldn't reallocate %zu bytes") at ink_error.cc:99
#3 0x00002ab03ec4cd0c in ats_realloc (ptr=0x13ac5010, size=262168) at ink_memory.cc:81
#4 0x00000000007c75bb in RecMessageMarshal_Realloc (msg=0x13ac5010, record=0x2ab03ea57eb8) at RecMessage.cc:112
#5 0x00000000007bd8a3 in send_push_message () at P_RecCore.cc:114
#6 0x00000000007cb374 in sync_cont::sync (this=0x2681e30) at RecProcess.cc:196
#7 0x000000000051cf1c in Continuation::handleEvent (this=0x2681e30, event=2, data=0x27b0dc0) at /home/file/trafficserver_7_1_2/iocore/eventsystem/I_Continuation.h:153
#8 0x00000000007ce700 in EThread::process_event (this=0x2ab043293010, e=0x27b0dc0, calling_code=2) at UnixEThread.cc:140
#9 0x00000000007ceb00 in EThread::execute_regular (this=0x2ab043293010) at UnixEThread.cc:221
#10 0x00000000007ced2c in EThread::execute (this=0x2ab043293010) at UnixEThread.cc:278
#11 0x00000000007cdbf5 in spawn_thread_internal (a=0x2678fd0) at Thread.cc:84
#12 0x00002ab04032edd5 in start_thread () from /lib64/libpthread.so.0
#13 0x00002ab0410f3ead in clone () from /lib64/libc.so.6

traffic_server[22832]: Fatal: couldn't reallocate 262168 bytes

Only test in 7.1.2. So strange. I don't know if it's related to the Compiler or Environment.
Memory is 128GB. There were enough free memory when broken down.