selftests/ublk: add test for async partition scan

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Add test_generic_15.sh to verify that async partition scan prevents
IO hang when reading partition tables.

The test creates ublk devices with fault_inject target and very large
delay (60s) to simulate blocked partition table reads, then kills the
daemon to verify proper state transitions without hanging:

1. Without recovery support:
   - Create device with fault_inject and 60s delay
   - Kill daemon while partition scan may be blocked
   - Verify device transitions to DEAD state

2. With recovery support (-r 1):
   - Create device with fault_inject, 60s delay, and recovery
   - Kill daemon while partition scan may be blocked
   - Verify device transitions to QUIESCED state

Before the async partition scan fix, killing the daemon during
partition scan would cause deadlock as partition scan held ub->mutex
while waiting for IO. With the async fix, partition scan happens in
a work function and flush_work() ensures proper synchronization.

Add _add_ublk_dev_no_settle() helper function to skip udevadm settle,
which would otherwise hang waiting for partition scan events to
complete when partition table read is delayed.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

This commit is contained in:

Ming Lei 2025-12-23 11:27:41 +08:00 • committed by Jens Axboe

parent 7fc4da6a30

commit 60cf863720

3 changed files with 81 additions and 4 deletions

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1

tools/testing/selftests/ublk/Makefile

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16

tools/testing/selftests/ublk/test_common.sh

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68

tools/testing/selftests/ublk/test_generic_15.sh Executable file

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