kernel memory leak on x86_64 in ia32 emulation mode (was: 2.6.8-1.521 memory leak?)
Axel Thimm
Axel.Thimm at ATrpms.net
Mon Sep 20 10:32:14 UTC 2004
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 at 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 at 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 at 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
>
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--
Axel.Thimm at ATrpms.net
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