FYI, we noticed the following commit (built with gcc-7): commit: 8c7829b04c523cdc732cb77f59f03320e09f3386 ("mm: fix false-positive OVERCOMMIT_GUESS failures") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: ltp with following parameters: disk: 1HDD test: mm-01 test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features. test-url: http://linux-test-project.github.io/ on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 4G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): If you fix the issue, kindly add following tag Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; [ 554.112267 ] <<<test_start>>> [ 554.112269 ] [ 554.115806 ] tag=overcommit_memory01 stime=1558074982 [ 554.115809 ] [ 554.119303 ] cmdline="overcommit_memory" [ 554.119306 ] [ 554.121962 ] contacts="" [ 554.121965 ] [ 554.124459 ] analysis=exit [ 554.124463 ] [ 554.127140 ] <<<test_output>>> [ 554.127144 ] [ 554.131401 ] tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s [ 554.131404 ] [ 554.136248 ] overcommit_memory.c:117: INFO: MemTotal is 4033124 kB [ 554.136251 ] [ 554.141365 ] overcommit_memory.c:119: INFO: SwapTotal is 268435452 kB [ 554.141368 ] [ 554.146664 ] overcommit_memory.c:123: INFO: CommitLimit is 270452012 kB [ 554.146666 ] [ 554.151375 ] mem.c:814: INFO: set overcommit_ratio to 50 [ 554.151378 ] [ 554.155796 ] mem.c:814: INFO: set overcommit_memory to 2 [ 554.155799 ] [ 554.159951 ] overcommit_memory.c:190: INFO: malloc 538608648 kB failed [ 554.159953 ] [ 554.164801 ] overcommit_memory.c:211: PASS: alloc failed as expected [ 554.164804 ] [ 554.170196 ] overcommit_memory.c:190: INFO: malloc 270452012 kB failed [ 554.170199 ] [ 554.175344 ] overcommit_memory.c:211: PASS: alloc failed as expected [ 554.175347 ] [ 554.180932 ] overcommit_memory.c:186: INFO: malloc 134651878 kB successfully [ 554.180935 ] [ 554.186522 ] overcommit_memory.c:205: PASS: alloc passed as expected [ 554.186524 ] [ 554.191234 ] mem.c:814: INFO: set overcommit_memory to 0 [ 554.191237 ] [ 554.196930 ] overcommit_memory.c:186: INFO: malloc 134734122 kB successfully [ 554.196933 ] [ 554.202738 ] overcommit_memory.c:205: PASS: alloc passed as expected [ 554.202742 ] [ 554.208563 ] overcommit_memory.c:190: INFO: malloc 538936488 kB failed [ 554.208566 ] [ 554.214355 ] overcommit_memory.c:211: PASS: alloc failed as expected [ 554.214357 ] [ 554.220506 ] overcommit_memory.c:186: INFO: malloc 272468576 kB successfully [ 554.220509 ] [ 554.226564 ] overcommit_memory.c:213: FAIL: alloc passed, expected to fail [ 554.226568 ] [ 554.231870 ] mem.c:814: INFO: set overcommit_memory to 1 [ 554.231873 ] [ 554.237819 ] overcommit_memory.c:186: INFO: malloc 136234288 kB successfully [ 554.237821 ] [ 554.243711 ] overcommit_memory.c:205: PASS: alloc passed as expected [ 554.243713 ] [ 554.249791 ] overcommit_memory.c:186: INFO: malloc 272468576 kB successfully [ 554.249794 ] [ 554.255069 ] overcommit_memory.c:205: PASS: alloc passed as expected [ 554.255073 ] [ 554.261594 ] overcommit_memory.c:186: INFO: malloc 544937152 kB successfully [ 554.261597 ] [ 554.267855 ] overcommit_memory.c:205: PASS: alloc passed as expected [ 554.267858 ] [ 554.273445 ] mem.c:814: INFO: set overcommit_memory to 0 [ 554.273448 ] [ 554.278882 ] mem.c:814: INFO: set overcommit_ratio to 50 [ 554.278885 ] [ 554.282419 ] [ 554.284170 ] Summary: [ 554.284173 ] [ 554.287476 ] passed 8 [ 554.287480 ] [ 554.290740 ] failed 1 [ 554.290743 ] [ 554.293971 ] skipped 0 [ 554.293974 ] [ 554.297123 ] warnings 0 [ 554.297126 ] [ 554.300746 ] <<<execution_status>>> [ 554.300749 ] [ 554.304489 ] initiation_status="ok" [ 554.304492 ] [ 554.309762 ] duration=0 termination_type=exited termination_id=1 corefile=no [ 554.309765 ] [ 554.313681 ] cutime=0 cstime=0 [ 554.313685 ] [ 554.316880 ] <<<test_end>>> To reproduce: # build kernel cd linux cp config-5.1.0-10246-g8c7829b .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email Thanks, Rong Chen