Description
In the Linux kernel, the following vulnerability has been resolved: blk-iocost: do not WARN if iocg was already offlined In iocg_pay_debt(), warn is triggered if 'active_list' is empty, which is intended to confirm iocg is active when it has debt. However, warn can be triggered during a blkcg or disk removal, if iocg_waitq_timer_fn() is run at that time: WARNING: CPU: 0 PID: 2344971 at block/blk-iocost.c:1402 iocg_pay_debt+0x14c/0x190 Call trace: iocg_pay_debt+0x14c/0x190 iocg_kick_waitq+0x438/0x4c0 iocg_waitq_timer_fn+0xd8/0x130 __run_hrtimer+0x144/0x45c __hrtimer_run_queues+0x16c/0x244 hrtimer_interrupt+0x2cc/0x7b0 The warn in this situation is meaningless. Since this iocg is being removed, the state of the 'active_list' is irrelevant, and 'waitq_timer' is canceled after removing 'active_list' in ioc_pd_free(), which ensures iocg is freed after iocg_waitq_timer_fn() returns. Therefore, add the check if iocg was already offlined to avoid warn when removing a blkcg or disk.
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
7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 56a9d07f427378eeb75b917bb49c6fbea8204126affected7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 7d215e013d097ed6fc4b0ad0272c9514214dc408affected7caa47151ab2e644dd221f741ec7578d9532c9a3 to < aed0aac18f039dd4af13c143063754efca358cb0affected7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 1c172ac7afe4442964f4153b2c78fe4e005d9d67affected7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 14b3275f93d4a0d8ddc02195bc4e9869b7a3700eaffected7caa47151ab2e644dd221f741ec7578d9532c9a3 to < 01bc4fda9ea0a6b52f12326486f07a4910666cf6affected
Linux Linux
Default version status: affected
5.4affected0 to < 5.4unaffected5.10.237 to ≤ 5.10.*unaffected5.15.181 to ≤ 5.15.*unaffected6.1.135 to ≤ 6.1.*unaffected6.6.31 to ≤ 6.6.*unaffected6.8.10 to ≤ 6.8.*unaffected6.9 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/56a9d07f427378eeb75b917bb49c6fbea8204126 ↗
- https://git.kernel.org/stable/c/7d215e013d097ed6fc4b0ad0272c9514214dc408 ↗
- https://git.kernel.org/stable/c/aed0aac18f039dd4af13c143063754efca358cb0 ↗
- https://git.kernel.org/stable/c/1c172ac7afe4442964f4153b2c78fe4e005d9d67 ↗
- https://git.kernel.org/stable/c/14b3275f93d4a0d8ddc02195bc4e9869b7a3700e ↗
- https://git.kernel.org/stable/c/01bc4fda9ea0a6b52f12326486f07a4910666cf6 ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html ↗