mallinfo01 from ubuntu_ltp_syscalls failed on X-4.15 / T-4.15

Issue found on X-oracle 4.15

This is a new test cases:
https://github.com/linux-test-project/ltp/commit/7eb7a97a1a28c2f498f89d6baf42c7581a519703

not a regression:
 startup='Sat Feb 27 07:16:17 2021'
 tst_test.c:1288: TINFO: Timeout per run is 0h 05m 00s
 mallinfo_common.h:16: TINFO: Start...
 mallinfo_common.h:18: TINFO: arena: 135168
 mallinfo_common.h:19: TINFO: ordblks: 2
 mallinfo_common.h:20: TINFO: smblks: 2
 mallinfo_common.h:21: TINFO: hblks: 0
 mallinfo_common.h:22: TINFO: hblkhd: 0
 mallinfo_common.h:23: TINFO: usmblks: 0
 mallinfo_common.h:24: TINFO: fsmblks: 240
 mallinfo_common.h:25: TINFO: uordblks: 176
 mallinfo_common.h:26: TINFO: fordblks: 134992
 mallinfo_common.h:27: TINFO: keepcost: 134608
 mallinfo_common.h:16: TINFO: Test uordblks...
 mallinfo_common.h:18: TINFO: arena: 135168
 mallinfo_common.h:19: TINFO: ordblks: 3
 mallinfo_common.h:20: TINFO: smblks: 0
 mallinfo_common.h:21: TINFO: hblks: 0
 mallinfo_common.h:22: TINFO: hblkhd: 0
 mallinfo_common.h:23: TINFO: usmblks: 0
 mallinfo_common.h:24: TINFO: fsmblks: 0
 mallinfo_common.h:25: TINFO: uordblks: 34096
 mallinfo_common.h:26: TINFO: fordblks: 101072
 mallinfo_common.h:27: TINFO: keepcost: 100688
 mallinfo01.c:46: TPASS: mallinfo() uordblks passed
 mallinfo_common.h:16: TINFO: Test ordblks...
 mallinfo_common.h:18: TINFO: arena: 135168
 mallinfo_common.h:19: TINFO: ordblks: 4
 mallinfo_common.h:20: TINFO: smblks: 0
 mallinfo_common.h:21: TINFO: hblks: 0
 mallinfo_common.h:22: TINFO: hblkhd: 0
 mallinfo_common.h:23: TINFO: usmblks: 0
 mallinfo_common.h:24: TINFO: fsmblks: 0
 mallinfo_common.h:25: TINFO: uordblks: 32480
 mallinfo_common.h:26: TINFO: fordblks: 102688
 mallinfo_common.h:27: TINFO: keepcost: 100688
 mallinfo01.c:58: TFAIL: mallinfo() ordblks failed

 Summary:
 passed 1
 failed 1
 broken 0
 skipped 0
 warnings 0
 tag=mallinfo01 stime=1614410177 dur=0 exit=exited stat=1 core=no cu=0 cs=0