md/raid1: don't set array_frozen in raid1_takeover()

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raid1_takeover() sets conf->array_frozen = 1 on the newly-allocated
r1conf and nothing ever clears it, so every I/O to the array stalls
permanently once _wait_barrier() sees it stuck at 1.

This used to be harmless: level_store() called mddev_resume() right
after pers->run(), which called raid1_quiesce(mddev, 0) and cleared
array_frozen back to 0 regardless of what raid1_takeover() set. Commit
b39f35ebe8 ("md: don't quiesce in mddev_suspend()") removed that
quiesce(mddev, 0) call, so the pre-set now sticks.

setup_conf() already zero-initializes the new r1conf via kzalloc, so
just don't set array_frozen here.

Same class of bug as commit 892da88d1c ("md/raid10: fix a
'conf->barrier' leakage in raid10_takeover()"), also triggered by
b39f35ebe8.

Fixes: b39f35ebe8 ("md: don't quiesce in mddev_suspend()")
Link: https://issues.redhat.com/browse/RHEL-191802
Signed-off-by: Bruce Johnston <bjohnsto@redhat.com>
Link: https://patch.msgid.link/20260803180240.1177104-1-bjohnsto@redhat.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>

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Bruce Johnston 2026-08-03 14:02:39 -04:00 • committed by Yu Kuai

parent efdffeb6d4

commit dc386aa0ac

1 changed files with 0 additions and 2 deletions

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drivers/md/raid1.c

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