Due to locking constraints the nfit_test implementation is not able to internally trigger ARS, so just run and wait for ARS manually in this test. For example, here is what happens if nfit_test call acpi_nfit_ars_rescan() from within the ioctl path. WARNING: possible circular locking dependency detected 4.16.0-rc4+ #1686 Tainted: G OE ------------------------------------------------------ kworker/u80:0/6 is trying to acquire lock: (&nvdimm_bus->reconfig_mutex){+.+.}, at: [<0000000048851014>] nvdimm_badblocks_populate+0x41/0x150 [libnvdimm] but task is already holding lock: (&acpi_desc->init_mutex){+.+.}, at: [<00000000016af3e5>] acpi_nfit_scrub+0x3b/0x2d0 [nfit] which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&acpi_desc->init_mutex){+.+.}: acpi_nfit_ars_rescan+0x28/0x160 [nfit] nfit_test_ctl+0x976/0x1040 [nfit_test] __nd_ioctl+0x5d8/0x650 [libnvdimm] nd_ioctl+0xa4/0xb0 [libnvdimm] do_vfs_ioctl+0xa5/0x6d0 SyS_ioctl+0x74/0x80 do_syscall_64+0x79/0x230 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&nvdimm_bus->reconfig_mutex){+.+.}: __mutex_lock+0x7f/0xa00 nvdimm_badblocks_populate+0x41/0x150 [libnvdimm] nd_region_notify+0x95/0xb0 [libnvdimm] nd_device_notify+0x40/0x50 [libnvdimm] ars_complete.isra.19+0x5d/0xb0 [nfit] ars_complete_all+0x42/0x60 [nfit] acpi_nfit_scrub+0x84/0x2d0 [nfit] process_one_work+0x212/0x660 worker_thread+0x3a/0x390 kthread+0x11e/0x140 ret_from_fork+0x3a/0x50 Signed-off-by: Dan Williams <dan.j.williams(a)intel.com&gt; --- test/pmem-errors.sh | 1 + 1 file changed, 1 insertion(+) diff --git a/test/pmem-errors.sh b/test/pmem-errors.sh index 7c0487d1ac49..e0ab9e866b92 100755 --- a/test/pmem-errors.sh +++ b/test/pmem-errors.sh @@ -59,6 +59,7 @@ err_sector="$(((size/512) / 2))" err_count=8 if ! read sector len < /sys/block/$blockdev/badblocks; then $NDCTL inject-error --block="$err_sector" --count=$err_count $dev + $NDCTL start-scrub; $NDCTL wait-scrub fi read sector len < /sys/block/$blockdev/badblocks [ $((sector * 2)) -ne $((size /512)) ] && echo "fail: $LINENO" && false