Unaccountable memory usage due to out-of-tree kernel module [b9k_87144]

Solution Verified - Updated -

Issue

  • Unable to account for high memory usage in the system.
The total used memory is 7 GiB (excluding Buffer, Cache, and Slab).

# free -m
              total        used        free      shared  buff/cache   available
Mem:           7442        7213         131           0          97          40
Swap:         16383        1165       15218

# cat /proc/meminfo
MemTotal:        7621416 kB
MemFree:          135140 kB
MemAvailable:      42332 kB
Buffers:              16 kB
Cached:            49176 kB
SwapCached:        15740 kB
Active:            43156 kB
Inactive:          53056 kB
Active(anon):      19968 kB
Inactive(anon):    40048 kB
Active(file):      23188 kB
Inactive(file):    13008 kB
Unevictable:       32412 kB
Mlocked:           32412 kB
SwapTotal:      16777212 kB
SwapFree:       15584164 kB
Dirty:               252 kB
Writeback:             0 kB
AnonPages:         78148 kB
Mapped:            40120 kB
Shmem:                72 kB
KReclaimable:      50744 kB
Slab:             580368 kB
SReclaimable:      50744 kB
SUnreclaim:       529624 kB
KernelStack:        8800 kB
PageTables:        16116 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    20587920 kB
Committed_AS:    1795744 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
Percpu:             2896 kB
HardwareCorrupted:     0 kB
AnonHugePages:     12288 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
FileHugePages:         0 kB
FilePmdMapped:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:               0 kB
DirectMap4k:     7298468 kB
DirectMap2M:     1089536 kB
DirectMap1G:     2097152 kB

Total memory usage from user space is 0.19 GiB.

# ps aux | tail -n +2 | cut -b2- | gawk '{mem += $6} END {print "Total RSS of user-mode: " mem/1048576 " GiB"}'
Total RSS of user-mode: 0.197514 GiB

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • VMware Carbon Black Bit9 Agent kernel module: [b9k_87144]

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