2022-04-06 21:03:02 sed "s:^:nbd/:" /lkp/benchmarks/blktests/tests/nbd-group-01
2022-04-06 21:03:02 ./check nbd/002 nbd/003
nbd/002 (tests on partition handling for an nbd device)     
nbd/002 (tests on partition handling for an nbd device)      [passed]
    runtime  ...  2.428s
nbd/003 (mount/unmount concurrently with NBD_CLEAR_SOCK)    
nbd/003 (mount/unmount concurrently with NBD_CLEAR_SOCK)     [failed]
    runtime  ...  34.325s
    something found in dmesg:
    [   37.820067] run blktests nbd/003 at 2022-04-06 21:03:05
    [   38.150255] nbd0: detected capacity change from 0 to 20971520
    [   38.155559] ------------[ cut here ]------------
    [   38.162025] WARNING: CPU: 0 PID: 1080 at block/blk-lib.c:62 __blkdev_issue_discard+0x52a/0x6c0
    [   38.171336] Modules linked in: nbd loop dm_multipath dm_mod btrfs blake2b_generic xor raid6_pq zstd_compress libcrc32c intel_rapl_msr intel_rapl_common ipmi_devintf sd_mod ipmi_msghandler t10_pi x86_pkg_temp_thermal intel_powerclamp crc64_rocksoft_generic crc64_rocksoft crc64 sg coretemp kvm_intel i915 kvm intel_gtt drm_buddy drm_dp_helper irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ttm ghash_clmulni_intel wmi_bmof mei_wdt rapl drm_kms_helper intel_cstate ahci syscopyarea sysfillrect sysimgblt libahci fb_sys_fops intel_uncore drm mei_me libata mei intel_pch_thermal wmi video intel_pmc_core acpi_pad ip_tables
    [   38.226743] CPU: 0 PID: 1080 Comm: mkfs.ext4 Tainted: G          I       5.18.0-rc1-00023-gee3286a02b37 #1
    [   38.237089] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.1.1 10/07/2015
    [   38.245175] RIP: 0010:__blkdev_issue_discard+0x52a/0x6c0
    [   38.251181] Code: 84 ff 44 8b 44 24 10 e9 e1 fb ff ff 44 89 44 24 18 48 89 44 24 10 e8 e5 c6 84 ff 44 8b 44 24 18 48 8b 44 24 10 e9 8a fc ff ff <0f> 0b 48 8d 6c 24 60 4c 89 e7 48 89 ee e8 c4 f2 02 00 48 c7 c6 40
    [   38.270641] RSP: 0018:ffffc900012b7ad0 EFLAGS: 00010246
    ...
    (See '/lkp/benchmarks/blktests/results/nodev/nbd/003.dmesg' for the entire message)