Greeting, FYI, we noticed the following commit (built with gcc-9): commit: c514f02a2b5b2dedb96e25fec5a516d8fb711525 ("nbd: use set_capacity_revalidate_and_notify") git://git.infradead.org/users/hch/misc.git nbd-set-size-fix in testcase: blktests version: blktests-x86_64-20445c5-1_20201007 with following parameters: test: nbd-group1 ucode: 0xdc on test machine: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz with 32G memory 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; 2020-11-02 20:28:51 sed "s:^:nbd/:" /lkp/benchmarks/blktests/tests/nbd-group1 2020-11-02 20:28:51 ./check nbd/001 nbd/002 nbd/003 nbd/001 (resize a connected nbd device) nbd/001 (resize a connected nbd device) [failed] runtime ... 1.095s --- tests/nbd/001.out 2020-10-07 22:29:16.000000000 +0000 +++ /lkp/benchmarks/blktests/results/nodev/nbd/001.out.bad 2020-11-02 20:28:52.308301248 +0000 @@ -1,5 +1,4 @@ Running nbd/001 -Disk /dev/nbd0: 10.7GB nbd0 43:0 0 10G 0 disk Setting size to 1gib nbd0 43:0 0 1G 0 disk nbd/002 (tests on partition handling for an nbd device) nbd/002 (tests on partition handling for an nbd device) [failed] runtime ... 0.341s --- tests/nbd/002.out 2020-10-07 22:29:16.000000000 +0000 +++ /lkp/benchmarks/blktests/results/nodev/nbd/002.out.bad 2020-11-02 20:28:52.684301245 +0000 @@ -1,4 +1,3 @@ Running nbd/002 Testing IOCTL path -Testing the netlink path -Test complete +Didn't have partition on ioctl path nbd/003 (mount/unmount concurrently with NBD_CLEAR_SOCK) nbd/003 (mount/unmount concurrently with NBD_CLEAR_SOCK) [passed] runtime ... 67.534s To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Rong Chen