Re: 2.6.8-1.521 memory leak? (was: [...] FC1/i386 vs FC2/x86_64: [...] memory consumption?)

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As a follow-up, this looks familiar to the following bug reports in
bugzilla:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=131251
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=131414
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=132180

The latter two may be leaking due to the SG_IO/bio_uncopy_user memory
leak:

http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.8.1/2.6.8.1-mm3/broken-out/bio_uncopy_user-mem-leak.patch

But the system in question has no active device driven by SCSI layers
(no SATA/SCSI/CD-ROM attached, only plain-old IDE), and the memory
leak occurs when trying to rebuild 2.6.8-1.521 kernels or kernel
modules.

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,
> > configure it the same (with a different port number),
> > keep downloading the same page from it and try to grab
> > /proc/<pid>/maps
> > from both processes.
> 
> It turns out that memory gets consumed and not returned back to the
> system independent of httpd (the oom-killer just strikes there first).
> 
> 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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