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I receive an intermittent error using iostat -k 5 : "Cannot open
/proc/stat: Cannot allocate memory"

This can also be simply reproduced by entering: "cat /proc/stat", one to
several (~5-10) times.

strace on the "cat /proc/stat" method:
...exclude typical run-up...

fstat(3, {st_mode=S_IFREG|0644, st_size=1607664, ...}) = 0
mmap(NULL, 1607664, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fd755b77000
close(3)                                = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 5), ...}) = 0
open("/proc/stat", O_RDONLY)            = -1 ENOMEM (Cannot allocate memory)
write(2, "cat: ", 5cat: )                    = 5
write(2, "/proc/stat", 10/proc/stat)              = 10
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd755d09000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2570
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x7fd755d09000, 4096)            = 0
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)

...exclude typical throw-error via LC_MESSAGES/libc.mo...


/proc/meminfo detail:
# cat /proc/meminfo 
MemTotal:       32947584 kB
MemFree:          302664 kB
Buffers:          154064 kB
Cached:         21284268 kB
SwapCached:      1728840 kB
Active:         12576792 kB
Inactive:       17279896 kB
Active(anon):    5097984 kB
Inactive(anon):  3320844 kB
Active(file):    7478808 kB
Inactive(file): 13959052 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:      187617276 kB
SwapFree:       185330320 kB
Dirty:               148 kB
Writeback:             0 kB
AnonPages:       7048592 kB
Mapped:           104312 kB
Shmem:               604 kB
Slab:            1947068 kB
SReclaimable:    1523288 kB
SUnreclaim:       423780 kB
KernelStack:        8800 kB
PageTables:        38260 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    204091068 kB
Committed_AS:   15333712 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      163292 kB
VmallocChunk:   34359457992 kB
HardwareCorrupted:     0 kB
AnonHugePages:     38912 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      333824 kB
DirectMap2M:    14313472 kB
DirectMap1G:    18874368 kB


This only seems to happens on specific hardware: Intel Server System P4000CP / S2600CP Motherboard, booted with kernel option: "pci=conf1"

This does NOT happen on very similar hardware: Intel Server R2312GZ /
S2600GZ Motherboard


Is there a possible memory, or kernel memory sysctl configurable I'm missing here?

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
iostat: Cannot open /proc/stat: Cannot allocate memory
https://bugs.launchpad.net/bugs/1226172
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