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.
Metrics
Affected Vendors & Products
References
History
Thu, 07 Nov 2024 17:15:00 +0000
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MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-05-30T15:29:07.773Z
Updated: 2024-11-07T16:16:27.980Z
Reserved: 2024-05-30T15:25:07.067Z
Link: CVE-2024-36908
Vulnrichment
Updated: 2024-08-02T03:43:49.881Z
NVD
Status : Awaiting Analysis
Published: 2024-05-30T16:15:14.300
Modified: 2024-11-07T17:35:19.317
Link: CVE-2024-36908
Redhat