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Cisco Bug: CSCvt25585 - 16GB DRAM Gen-1 leaf switch kernel panic'd due to memory depletion by long running log activity

Last Modified

Sep 06, 2020

Products (24)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 93120TX Switch
  • Cisco Nexus 93240YC-FX2 Switch
  • Cisco Nexus 9372TX-E Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 93108TC-EX Switch
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Known Affected Releases

14.1(2o)

Description (partial)

Symptom:
16 GB leaf switches that do not have -EX, -FX, or a later suffix in the product ID have a kernel panic without generating any core files. The dmesg output shows it was due to an out-of-memory issue.

Conditions:
The issue seems present on both 16 GB and 24 GB leaf switches that do not have -EX, -FX, or a later suffx in the product ID, but the 24 GB leaf switches are much less likely to crash due to having more memory.

The source of the problem is to be due to the fact there is a lot of memory in the SlabReclaimable section of the memory that is not being released. There is a lot dentry in the slabtop output on the affected switch. The high amount of memory usage is due to FS activity (log activity), which can lead to the high SReclaimable memory. The page cache gets filled when creating log files in the memory partition and then we moving the files to the SSD.
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