PT-2026-64636 · Linux · Linux
CVE-2026-64415
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Published
2026-07-25
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Updated
2026-07-25
None
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In the Linux kernel, the following vulnerability has been resolved:
mm/swap: add cond resched() in swap reclaim full clusters to prevent softlockup
We hit a real softlockup in an internal stress test environment. The
workload was LTP memory/swap stress on a large arm64 machine, with 320
CPUs, about 1TB memory and an 8.6GB swap device. The system was under
heavy load and the swap device had a large number of full clusters. The
softlockup was triggered during a stress test after about 3 days.
So, add periodic cond resched() calls during large full clusters
reclaim operations to prevent softlockup issues.
Detailed call trace as follow:
PID: 3817773 TASK: ffff0883bb28b780 CPU: 48 COMMAND: "kworker/48:7"
#0 [ffff800080183d10] crash kexec at ffffa4c1361e5de4
#1 [ffff800080183d90] panic at ffffa4c1360d5e9c
#2 [ffff800080183e20] watchdog timer fn at ffffa4c136231fa8
...
#16 [ffff8000c4ad3cb0] swap cache del folio at ffffa4c1363e1614
#17 [ffff8000c4ad3ce0] try to reclaim swap at ffffa4c1363e4bfc
#18 [ffff8000c4ad3d40] swap reclaim full clusters at ffffa4c1363e5474
#19 [ffff8000c4ad3da0] swap reclaim work at ffffa4c1363e550c
#20 [ffff8000c4ad3dc0] process one work at ffffa4c136102edc
#21 [ffff8000c4ad3e10] worker thread at ffffa4c136103398
#22 [ffff8000c4ad3e70] kthread at ffffa4c13610d95c
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Related Identifiers
Affected Products
Linux