Description
In the Linux kernel, the following vulnerability has been resolved: quota: flush quota_release_work upon quota writeback One of the paths quota writeback is called from is: freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots() Since we currently don't always flush the quota_release_work queue in this path, we can end up with the following race: 1. dquot are added to releasing_dquots list during regular operations. 2. FS Freeze starts, however, this does not flush the quota_release_work queue. 3. Freeze completes. 4. Kernel eventually tries to flush the workqueue while FS is frozen which hits a WARN_ON since transaction gets started during frozen state: ext4_journal_check_start+0x28/0x110 [ext4] (unreliable) __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0 Which is the following line: WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); Which ultimately results in generic/390 failing due to dmesg noise. This was detected on powerpc machine 15 cores. To avoid this, make sure to flush the workqueue during dquot_writeback_dquots() so we dont have any pending workitems after freeze.
Product status
d40c192e119892799dd4ddf94f5cea6fa93775ef (git) before a5abba5e0e586e258ded3e798fe5f69c66fec198
86d89987f0998c98f57d641e308b40452a994045 (git) before 6f3821acd7c3143145999248087de5fb4b48cf26
89602de9a2d7080b7a4029d5c1bf8f78d295ff5f (git) before ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb
3027e200dd58d5b437f16634dbbd355b29ffe0a6 (git) before 3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb
dabc8b20756601b9e1cc85a81d47d3f98ed4d13a (git) before bcacb52a985f1b6d280f698a470b873dfe52728a
dabc8b20756601b9e1cc85a81d47d3f98ed4d13a (git) before 8ea87e34792258825d290f4dc5216276e91cb224
dabc8b20756601b9e1cc85a81d47d3f98ed4d13a (git) before ac6f420291b3fee1113f21d612fa88b628afab5b
f3e9a2bbdeb8987508dd6bb2b701dea911d4daec (git)
903fc5d8cb48b0d2de7095ef40e39fd32bb27bd0 (git)
31bed65eecbc5ce57592cfe31947eaa64e3d678e (git)
6.6
Any version before 6.6
5.4.287 (semver)
5.10.231 (semver)
5.15.174 (semver)
6.1.120 (semver)
6.6.64 (semver)
6.12.4 (semver)
6.13 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/03/msg00001.html
lists.debian.org/debian-lts-announce/2025/03/msg00002.html
git.kernel.org/...c/a5abba5e0e586e258ded3e798fe5f69c66fec198
git.kernel.org/...c/6f3821acd7c3143145999248087de5fb4b48cf26
git.kernel.org/...c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb
git.kernel.org/...c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb
git.kernel.org/...c/bcacb52a985f1b6d280f698a470b873dfe52728a
git.kernel.org/...c/8ea87e34792258825d290f4dc5216276e91cb224
git.kernel.org/...c/ac6f420291b3fee1113f21d612fa88b628afab5b