Description
In the Linux kernel, the following vulnerability has been resolved: md: wake raid456 reshape waiters before suspend During raid456 reshape, direct IO across the reshape position can sleep in raid5_make_request() waiting for reshape progress while still holding an active_io reference. If userspace then freezes reshape and writes md/suspend_lo or md/suspend_hi, mddev_suspend() kills active_io and waits for all in-flight IO to drain. This can deadlock: the IO needs reshape progress to continue, but the reshape thread is already frozen, so the active_io reference is never dropped and suspend never completes. raid5_prepare_suspend() already wakes wait_for_reshape for dm-raid. Do the same for normal md suspend when reshape is already interrupted, so waiting raid456 IO can abort, drop its reference, and let suspend finish. The mdadm test tests/25raid456-reshape-deadlock reproduces the hang.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
714d20150ed85811193ae07a494d91f9927c590f to < 8b6a72420821e6da2cab6a69d5233500d2698b93affected714d20150ed85811193ae07a494d91f9927c590f to < ff6b93410192b812d73cc54062529715b2dc849faffected714d20150ed85811193ae07a494d91f9927c590f to < 8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0affected714d20150ed85811193ae07a494d91f9927c590f to < cf86bb53b9c92354904a328e947a05ffbfdd1840affected2284eab166f2df83f94f0422e15dc9e73b278abfaffected6.6.160 to < 6.7affected
Linux Linux
Default version status: affected
6.7affected0 to < 6.7unaffected6.12.91 to ≤ 6.12.*unaffected6.18.33 to ≤ 6.18.*unaffected7.0.10 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected