kernel memory leak on x86_64 in ia32 emulation mode (was: 2.6.8-1.521 memory leak?)

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On Mon, Sep 13, 2004 at 11:36:28AM +0200, Axel Thimm wrote:
> On Mon, Sep 13, 2004 at 03:05:44AM +0200, Axel Thimm wrote:
> > On Fri, Sep 03, 2004 at 06:46:18AM -0400, Jakub Jelinek wrote:
> > > On Fri, Sep 03, 2004 at 12:40:53PM +0200, Axel Thimm wrote:
> > > > How can I debug the memory consumption on this box? Which figures are
> > > > the ones to look for and which ones do accumulate for the OOM killer?
> > > 
> > > IMHO best would be to install 32-bit and 64-bit httpd side by side,
> > 
> > It turns out that memory gets consumed and not returned back to the
> > system independent of httpd (the oom-killer just strikes there first).

The bug has now been identified as a kernel memory leak in
2.6.8-1.521 and 2.6.8-1.541 on a x86_64 system running ia32 bit apps
in IA32_EMULATION mode.

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=132947

It is easily reproducable, and I wonder why there have been so few
reports on the net on this (kernel 2.6.8-1.521 has been released
before a month). Probably most x86_64 users are running in 64 bits
only and don't observe the leak.

Any references/fixes are more than welcome. :)

> > On an FC2/x86_64 system (Tyan S2880 with one processor only) with
> > untained 2.6.8-1.521 on 1GB RAM simple compilations can eat up all the
> > memory. I trimmed down such a system up to basic networking to detect
> > which processes were locking the memory, and no userland processes are
> > holding the memory. But almost all memory is flagged as "used" (with
> > negligible size of buffers and cache).
> > 
> > Is this a kernel memory leak? Any other information I should collect?
> > 
> > (I still cannot judge whether the change from kernel 2.4 to 2.6 or the
> > architecture change i386 to x86_64 is responsible for this due to lack
> > of different combinations)
> > 
> > # free
> >              total       used       free     shared    buffers     cached
> > Mem:       1027016    1022600       4416          0        992       7288
> > -/+ buffers/cache:    1014320      12696
> > Swap:      2047992       4496    2043496
> > # vmstat -a
> > procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
> >  r  b   swpd   free  inact active   si   so    bi    bo   in    cs us sy id wa
> >  0  0   4496   4352   4548   6556    1    1   399    80 1517   162  2  2 88  8
> > # cat /proc/meminfo
> > MemTotal:      1027016 kB
> > MemFree:          4352 kB
> > Buffers:          1008 kB
> > Cached:           7316 kB
> > SwapCached:       1148 kB
> > Active:           6528 kB
> > Inactive:         4536 kB
> > HighTotal:           0 kB
> > HighFree:            0 kB
> > LowTotal:      1027016 kB
> > LowFree:          4352 kB
> > SwapTotal:     2047992 kB
> > SwapFree:      2043496 kB
> > Dirty:             236 kB
> > Writeback:           0 kB
> > Mapped:           5296 kB
> > Slab:            14388 kB
> > Committed_AS:   535496 kB
> > PageTables:     494900 kB
> > VmallocTotal: 536870911 kB
> > VmallocUsed:      1568 kB
> > VmallocChunk: 536869323 kB
> > HugePages_Total:     0
> > HugePages_Free:      0
> > Hugepagesize:     2048 kB
> > # ps uaxwwf
> > USER       PID %CPU %MEM   VSZ  RSS TTY      STAT START   TIME COMMAND
> > root         1  0.0  0.0  3472  428 ?        S    Sep12   0:01 init [3]       
> > root         2  0.0  0.0     0    0 ?        SWN  Sep12   0:00 [ksoftirqd/0]
> > root         3  0.0  0.0     0    0 ?        SW<  Sep12   0:00 [events/0]
> > root         4  0.0  0.0     0    0 ?        SW<  Sep12   0:00  \_ [khelper]
> > root         5  0.0  0.0     0    0 ?        SW<  Sep12   0:00  \_ [kacpid]
> > root        30  0.0  0.0     0    0 ?        SW<  Sep12   0:00  \_ [kblockd/0]
> > root        44  0.0  0.0     0    0 ?        SW   Sep12   0:00  \_ [pdflush]
> > root        45  0.0  0.0     0    0 ?        SW   Sep12   0:02  \_ [pdflush]
> > root        47  0.0  0.0     0    0 ?        SW<  Sep12   0:00  \_ [aio/0]
> > root       186  0.0  0.0     0    0 ?        SW<  Sep12   0:00  \_ [ata/0]
> > root        31  0.0  0.0     0    0 ?        SW   Sep12   0:00 [khubd]
> > root        46  0.0  0.0     0    0 ?        SW   Sep12   0:01 [kswapd0]
> > root       151  0.0  0.0     0    0 ?        SW   Sep12   0:00 [kseriod]
> > root       188  0.0  0.0     0    0 ?        SW   Sep12   0:00 [scsi_eh_0]
> > root       189  0.0  0.0     0    0 ?        SW   Sep12   0:00 [scsi_eh_1]
> > root       204  0.0  0.0     0    0 ?        SW   Sep12   0:00 [kjournald]
> > root       339  0.0  0.0  2336  216 ?        S<   Sep12   0:00 udevd
> > root       896  0.0  0.0     0    0 ?        SW   Sep12   0:00 [kjournald]
> > root       897  0.0  0.0     0    0 ?        SW   Sep12   0:00 [kjournald]
> > root       898  0.0  0.0     0    0 ?        SW   Sep12   0:00 [kjournald]
> > root       899  0.0  0.0     0    0 ?        SW   Sep12   0:00 [kjournald]
> > root      1637  0.0  0.0     0    0 ?        SW<  Sep12   0:00 [krfcommd]
> > root      1946  0.0  0.0 18104  748 ?        S    Sep12   0:00 /usr/sbin/sshd
> > root      5189  0.0  0.1 37540 1056 ?        S    02:04   0:00  \_ sshd: root@pts/0
> > root      5195  0.0  0.0 45656 1020 pts/0    S    02:04   0:00  |   \_ -bash
> > root      5255  0.0  0.1 104764 1892 pts/0   S    02:04   0:00  |       \_ gkrellm
> > root     29075  0.0  0.0 44836  500 pts/0    S    02:38   0:00  |       \_ sleep 10
> > root      6119  0.0  0.0 37284 1020 ?        S    02:19   0:00  \_ sshd: root@pts/1
> > root      6133  0.0  0.1 45656 1120 pts/1    S    02:19   0:00  |   \_ -bash
> > root     29079  0.0  0.0 44476  924 pts/1    S    02:38   0:00  |       \_ /bin/sh ./memory.sh
> > root     29083  0.0  0.0  5228  784 pts/1    R    02:38   0:00  |           \_ ps uaxwwf
> > root      6193  0.0  0.0 37284 1020 ?        S    02:20   0:00  \_ sshd: root@pts/2
> > root      6212  0.0  0.1 45656 1136 pts/2    S    02:20   0:00  |   \_ -bash
> > root     29077  0.0  0.1 35936 1932 ?        S    02:38   0:00  \_ sshd: bin [priv]
> > sshd     29078  0.0  0.1 19448 1120 ?        S    02:38   0:00      \_ sshd: bin [net]
> > root      2542  0.0  0.0  2344  272 tty1     S    Sep12   0:00 /sbin/mingetty tty1
> > root      2543  0.0  0.0  2344  272 tty2     S    Sep12   0:00 /sbin/mingetty tty2
> > root      2544  0.0  0.0  2344  272 tty3     S    Sep12   0:00 /sbin/mingetty tty3
> > root      2545  0.0  0.0  2344  276 tty4     S    Sep12   0:00 /sbin/mingetty tty4
> > root      2546  0.0  0.0  2344  276 tty5     S    Sep12   0:00 /sbin/mingetty tty5
> > root      2547  0.0  0.0  2344  276 tty6     S    Sep12   0:00 /sbin/mingetty tty6
> 
> 
> 
> 
> 





-- 
Axel.Thimm at ATrpms.net

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