Description of problem:

失败用例集中在mm、syscalls等分类下，并且存在反复测试输出结果不一致的问题，概率性失败。

成功日志：
tst_test.c:1669: TINFO: === Testing on vfat ===
tst_test.c:1118: TINFO: Formatting /dev/loop1 with vfat opts='' extra opts=''
tst_test.c:1132: TINFO: Mounting /dev/loop1 to /tmp/ltp-wc5ESfcq0H/LTP_fan9ovxiO/mntpoint fstyp=vfat flags=0
fanotify15.c:87: TINFO: Test #0: FAN_REPORT_FID on filesystem including FAN_DELETE_SELF
失败日志：
tst_test.c:1669: TINFO: === Testing on vfat ===
tst_test.c:1118: TINFO: Formatting /dev/loop1 with vfat opts='' extra opts=''
mkfs.vfat: unable to open /dev/loop1: Device or resource busy
tst_test.c:1118: TBROK: mkfs.vfat failed with exit code 1
失败日志：
tst_device.c:264: TWARN: ioctl(/dev/loop1, LOOP_CLR_FD, 0) no ENXIO for too long
失败日志：
tst_test.c:1669: TINFO: === Testing on ext3 ===
tst_test.c:1118: TINFO: Formatting /dev/loop4 with ext3 opts='' extra opts=''
mke2fs 1.46.0 (29-Jan-2020)
/dev/loop4 已经挂载； 取消建立 文件系统 ！
tst_test.c:1118: TBROK: mkfs.ext3 failed with exit code 1
tst_device.c:264: TWARN: ioctl(/dev/loop4, LOOP_CLR_FD, 0) no ENXIO for too long


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