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linux/tools/testing/selftests/ublk
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Ming Lei 87d0740b7c selftests: ublk: cap nthreads to kernel's actual nr_hw_queues 
dev->nthreads is derived from the user-requested queue count before the
ADD command, but the kernel may reduce nr_hw_queues (capped to
nr_cpu_ids). When the VM has fewer CPUs than requested queues, the
daemon creates more handler threads than there are kernel queues.

In non-batch mode, the extra threads access uninitialized queues
(q_depth=0), submit zero io_uring SQEs, and block forever in
io_cqring_wait. In batch mode, the extra threads cause similar hangs
during device removal.

In both cases, the stuck threads prevent the daemon from closing the
char device, holding the last ublk_device reference and causing
ublk_ctrl_del_dev() to hang in wait_event_interruptible().

Fix by capping dev->nthreads to the kernel-returned nr_hw_queues after
the ADD command completes. per_io_tasks mode is excluded because threads
interleave across all queues, so nthreads > nr_hw_queues is valid.

Fixes: abe54c1603 ("selftests: ublk: kublk: decouple ublk_queues from ublk server threads")
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Link: https://patch.msgid.link/20260513101941.1373998-1-tom.leiming@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2026-05-13 07:55:39 -06:00
..
trace selftests: ublk: improve I/O ordering test with bpftrace 2026-01-31 14:56:28 -07:00
.gitignore selftests: ublk: add missing gitignore for metadata_size binary 2026-01-25 10:11:32 -07:00
batch.c selftests: ublk: support arbitrary threads/queues combination 2026-01-22 20:05:41 -07:00
common.c selftests: ublk: replace assert() with ublk_assert() 2026-01-22 20:05:41 -07:00
config
fault_inject.c selftests: ublk: test that teardown after incomplete recovery completes 2026-04-06 08:37:48 -06:00
file_backed.c selftests/ublk: add UBLK_F_SHMEM_ZC support for loop target 2026-04-07 07:42:23 -06:00
kublk.c selftests: ublk: cap nthreads to kernel's actual nr_hw_queues 2026-05-13 07:55:39 -06:00
kublk.h selftests/ublk: add read-only buffer registration test 2026-04-07 07:42:39 -06:00
Makefile selftests: ublk: add ublk auto integrity test 2026-04-23 04:52:43 -06:00
metadata_size.c selftests: ublk: add utility to get block device metadata size 2026-01-12 09:16:38 -07:00
null.c selftests: ublk: add ublk_io_buf_idx() for returning io buffer index 2026-01-22 20:05:41 -07:00
settings selftests: ublk: increase timeout to 150 seconds 2026-01-22 20:05:41 -07:00
stripe.c selftests: ublk: add ublk_io_buf_idx() for returning io buffer index 2026-01-22 20:05:41 -07:00
test_batch_01.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_batch_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_batch_03.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_common.sh selftests/ublk: add filesystem fio verify test for shmem_zc 2026-04-07 07:42:23 -06:00
test_generic_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_03.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_06.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_07.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_08.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_09.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_10.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_12.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_13.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_16.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_generic_17.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_integrity_01.sh selftests: ublk: reorganize tests into integrity and recover groups 2026-01-31 14:56:28 -07:00
test_integrity_02.sh selftests: ublk: enable test_integrity_02.sh on fio 3.42 2026-04-23 04:52:43 -06:00
test_integrity_03.sh selftests: ublk: add ublk auto integrity test 2026-04-23 04:52:43 -06:00
test_loop_01.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_loop_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_loop_03.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_loop_04.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_loop_05.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_loop_06.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_loop_07.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_null_01.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_null_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_null_03.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_part_01.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_part_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_recover_01.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_recover_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_recover_03.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_recover_04.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_shmemzc_01.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_shmemzc_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_shmemzc_03.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_shmemzc_04.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_01.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_03.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_04.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_05.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_06.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_07.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_08.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stress_09.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stripe_01.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stripe_02.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stripe_03.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stripe_04.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stripe_05.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
test_stripe_06.sh selftests: ublk: remove unused argument to _cleanup 2026-04-23 04:52:43 -06:00
ublk_dep.h selftests: ublk: add one dependency header 2025-03-20 17:18:55 -06:00
utils.h selftests: ublk: add batch buffer management infrastructure 2026-01-22 20:05:41 -07:00