It seems that mm->vm_total is decreased too many times and wraps below
zero:
$ cat /proc/16736/status
Name: XFree86
State: S (sleeping)
SleepAVG: 98%
Tgid: 16736
Pid: 16736
PPid: 16735
TracerPid: 0
Uid: 916 0 0 0
Gid: 1500 0 0 0
FDSize: 256
Groups: 1500
VmSize: 4294966376 kB <==
VmLck: 0 kB
VmRSS: 30996 kB
VmData: 4294960304 kB <==
VmStk: 88 kB
VmExe: 1512 kB
VmLib: 1584 kB
VmPTE: 176 kB
Threads: 1
SigQ: 0/8180
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000010000000
SigIgn: 8000000000301000
SigCgt: 00000000418066cb
CapInh: 0000000000000000
CapPrm: 00000000fffffeff
CapEff: 00000000fffffeff
$ cat /proc/16736/maps
000a0000-000c0000 rwxs 000a0000 08:02 502100 /dev/mem
000f0000-00100000 r-xs 000f0000 08:02 502100 /dev/mem
08048000-081c2000 r-xp 00000000 08:02 598142 /usr/X11R6/bin/XFree86
081c2000-081f3000 rwxp 00179000 08:02 598142 /usr/X11R6/bin/XFree86
081f3000-0906b000 rwxp 081f3000 00:00 0 [heap]
aecb4000-aecb6000 rwxp aecb4000 00:00 0
aed27000-aed29000 rwxp aee7c000 00:00 0
aed5e000-aed60000 rwxp afb4c000 00:00 0
aed98000-aed9a000 rwxp aed98000 00:00 0
aedd1000-aedd3000 rwxp aedd1000 00:00 0
aee0a000-aee0c000 rwxp aee0a000 00:00 0
aee43000-aee45000 rwxp aee43000 00:00 0
aee7d000-aee7f000 rwxp aed5f000 00:00 0
aeeb4000-aeeb6000 rwxp aeeb5000 00:00 0
aeeee000-aef4e000 rwxs 00000000 00:07 2654229 /SYSV00000000 (deleted)
aef4e000-aef51000 rwxs 00000000 00:07 2621460 /SYSV00000000 (deleted)
aef51000-af452000 rwxp aef51000 00:00 0
af452000-af4b2000 rwxs 00000000 00:07 2588691 /SYSV00000000 (deleted)
af4b2000-af9b3000 rwxp af4b2000 00:00 0
af9d8000-afa38000 rwxs 00000000 00:07 2555922 /SYSV00000000 (deleted)
afa38000-afa98000 rwxs 00000000 00:07 2523153 /SYSV00000000 (deleted)
afa98000-afaf8000 rwxs 00000000 00:07 2490384 /SYSV00000000 (deleted)
afb13000-afb15000 rwxp afb13000 00:00 0
afb85000-afbe5000 rwxs 00000000 00:07 2457614 /SYSV00000000 (deleted)
afbe5000-afc45000 rwxs 00000000 00:07 2424845 /SYSV00000000 (deleted)
afc45000-afc7e000 rwxp afd29000 00:00 0
afc7e000-afcb7000 rwxp afd29000 00:00 0
afcb7000-afcf0000 rwxp afd29000 00:00 0
afcf0000-afd29000 rwxp afd29000 00:00 0
afd60000-b7d50000 rwxs d0000000 08:02 502100 /dev/mem
b7d50000-b7d60000 rwxs dfde0000 08:02 502100 /dev/mem
b7d60000-b7e00000 rwxp b7d60000 00:00 0
b7e00000-b7f2a000 r-xp 00000000 08:02 259908 /lib/tls/libc-2.3.2.so
b7f2a000-b7f33000 rwxp 00129000 08:02 259908 /lib/tls/libc-2.3.2.so
b7f33000-b7f35000 rwxp b7f33000 00:00 0
b7f35000-b7f3d000 r-xp 00000000 08:02 258997 /lib/libgcc_s.so.1
b7f3d000-b7f3e000 rwxp 00007000 08:02 258997 /lib/libgcc_s.so.1
b7f3e000-b7f40000 r-xp 00000000 08:02 259910 /lib/tls/libdl-2.3.2.so
b7f40000-b7f41000 rwxp 00002000 08:02 259910 /lib/tls/libdl-2.3.2.so
b7f41000-b7f62000 r-xp 00000000 08:02 259911 /lib/tls/libm-2.3.2.so
b7f62000-b7f63000 rwxp 00020000 08:02 259911 /lib/tls/libm-2.3.2.so
b7f63000-b7f64000 rwxp b7f63000 00:00 0
b7f64000-b7f75000 r-xp 00000000 08:02 674545 /usr/lib/libz.so.1.2.2
b7f75000-b7f76000 rwxp 00010000 08:02 674545 /usr/lib/libz.so.1.2.2
b7f8c000-b7f8d000 rwxp b7f8c000 00:00 0
b7f8d000-b7fa3000 r-xp 00000000 08:02 258972 /lib/ld-2.3.2.so
b7fa3000-b7fa4000 rwxp 00015000 08:02 258972 /lib/ld-2.3.2.so
bfd8d000-bfda3000 rwxp bfd8d000 00:00 0 [stack]
ffffe000-fffff000 ---p 00000000 00:00 0 [vdso]
--
Frank
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