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
- Linux / Linux714d20150ed85811193ae07a494d91f9927c590f – 8b6a72420821e6da2cab6a69d5233500d2698b93
- Linux / Linux714d20150ed85811193ae07a494d91f9927c590f – ff6b93410192b812d73cc54062529715b2dc849f
- Linux / Linux714d20150ed85811193ae07a494d91f9927c590f – 8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0
- Linux / Linux714d20150ed85811193ae07a494d91f9927c590f – cf86bb53b9c92354904a328e947a05ffbfdd1840
- Linux / Linux6.7 – 6.7
- Linux / Linux0 – 6.7
- Linux / Linux6.12.91 – 6.12.*
- Linux / Linux6.18.33 – 6.18.*
- Linux / Linux7.0.10 – 7.0.*
- Linux / Linux7.1 – *
References
- MISChttps://git.kernel.org/stable/c/8b6a72420821e6da2cab6a69d5233500d2698b93
- MISChttps://git.kernel.org/stable/c/ff6b93410192b812d73cc54062529715b2dc849f
- MISChttps://git.kernel.org/stable/c/8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0
- MISChttps://git.kernel.org/stable/c/cf86bb53b9c92354904a328e947a05ffbfdd1840