Re: Memory leak in migration on Xen 4.4

[Matthew Vernon <mcv21@cam.ac.uk>]

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Hello,

On 19/11/15 14:51, Ian Campbell wrote:
> Following on from IRC conversation regarding an issue similar to [0] (which
> was reported by someone else).
> 
> I've implemented the missing hypercall support in valgrind, see attached
> which applies to SVN r15732. This is migrating cleanly (i.e. no
> "README_MISSING_SYSCALL_OR_IOCTL" spew) for me with the attached
> suppression file which knocks out one known (benign) issue.

I applied this patch to unstable's valgrind, and have now performed a
migration in both directions (see attached).

> With this things appear pretty clean using the Jessie packages for
> everything. Just a few k lost or remaining reachable at the end (see
> attached logs).

Can I suggest you try the kernel from jessie-backports? That's what I'm
using; I have kernel 4.2.0 (I needed this because 3.6 from jessie
doesn't support some of my hardware when running Xen).

This is a 1G guest again, and you'll see that receiving version gets
through over 4G.

Regards,

Matthew


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==17035== Memcheck, a memory error detector
==17035== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==17035== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==17035== Command: /usr/lib/xen-4.4/bin/libxl-save-helper.orig --restore-domain 6 9 1 0 2 0 0 1 0 1 0 0
==17035== Parent PID: 17034
==17035== 
==17035== Warning: set address range perms: large range [0x395dc040, 0x795dc040) (defined)
==17035== Warning: set address range perms: large range [0x795dd040, 0xb95dd040) (defined)
==17035== Warning: set address range perms: large range [0xb95de040, 0xf93de040) (undefined)
==17035== Warning: set address range perms: large range [0xf93df000, 0x1393df000) (defined)
==17035== Warning: set address range perms: large range [0xf93df000, 0x1393df000) (noaccess)
==17035== Warning: set address range perms: large range [0x395dc028, 0x795dc058) (noaccess)
==17035== Warning: set address range perms: large range [0x795dd028, 0xb95dd058) (noaccess)
==17035== Warning: set address range perms: large range [0xb95de028, 0xf93de058) (noaccess)
==17035== 
==17035== HEAP SUMMARY:
==17035==     in use at exit: 2,098,392 bytes in 4 blocks
==17035==   total heap usage: 2,822 allocs, 2,818 frees, 4,342,797,896 bytes allocated
==17035== 
==17035== 8 bytes in 1 blocks are definitely lost in loss record 1 of 4
==17035==    at 0x4C28CA0: malloc (vg_replace_malloc.c:299)
==17035==    by 0x4C2B04F: realloc (vg_replace_malloc.c:785)
==17035==    by 0x5064405: ??? (in /usr/lib/x86_64-linux-gnu/libxenguest-4.4.so)
==17035==    by 0x5063E02: ??? (in /usr/lib/x86_64-linux-gnu/libxenguest-4.4.so)
==17035==    by 0x5065ADB: xc_domain_restore (in /usr/lib/x86_64-linux-gnu/libxenguest-4.4.so)
==17035==    by 0x4014AF: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==17035==    by 0x54C6B44: (below main) (libc-start.c:287)
==17035== 
==17035== 24 bytes in 1 blocks are still reachable in loss record 2 of 4
==17035==    at 0x4C28CA0: malloc (vg_replace_malloc.c:299)
==17035==    by 0x401774: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==17035==    by 0x401456: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==17035==    by 0x54C6B44: (below main) (libc-start.c:287)
==17035== 
==17035== 1,208 bytes in 1 blocks are still reachable in loss record 3 of 4
==17035==    at 0x4C28CA0: malloc (vg_replace_malloc.c:299)
==17035==    by 0x4E4A08A: ??? (in /usr/lib/x86_64-linux-gnu/libxenctrl-4.4.so)
==17035==    by 0x4017CC: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==17035==    by 0x401456: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==17035==    by 0x54C6B44: (below main) (libc-start.c:287)
==17035== 
==17035== 2,097,152 bytes in 1 blocks are definitely lost in loss record 4 of 4
==17035==    at 0x4C28CA0: malloc (vg_replace_malloc.c:299)
==17035==    by 0x5065806: xc_domain_restore (in /usr/lib/x86_64-linux-gnu/libxenguest-4.4.so)
==17035==    by 0x4014AF: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==17035==    by 0x54C6B44: (below main) (libc-start.c:287)
==17035== 
==17035== LEAK SUMMARY:
==17035==    definitely lost: 2,097,160 bytes in 2 blocks
==17035==    indirectly lost: 0 bytes in 0 blocks
==17035==      possibly lost: 0 bytes in 0 blocks
==17035==    still reachable: 1,232 bytes in 2 blocks
==17035==         suppressed: 0 bytes in 0 blocks
==17035== 
==17035== For counts of detected and suppressed errors, rerun with: -v
==17035== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)

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==6331== Memcheck, a memory error detector
==6331== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==6331== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==6331== Command: /usr/lib/xen-4.4/bin/libxl-save-helper.orig --save-domain 8 9 0 0 1 0 0 12 8 72
==6331== Parent PID: 6330
==6331== 
==6331== Warning: set address range perms: large range [0xa292000, 0x2a692000) (defined)
==6331== Warning: set address range perms: large range [0x395dc000, 0x795dc000) (defined)
==6331== Warning: set address range perms: large range [0x395dc000, 0x795dc000) (noaccess)
==6331== Warning: set address range perms: large range [0xa292000, 0x2a692000) (noaccess)
==6331== 
==6331== HEAP SUMMARY:
==6331==     in use at exit: 1,232 bytes in 2 blocks
==6331==   total heap usage: 697 allocs, 695 frees, 38,370,651 bytes allocated
==6331== 
==6331== 24 bytes in 1 blocks are still reachable in loss record 1 of 2
==6331==    at 0x4C28CA0: malloc (vg_replace_malloc.c:299)
==6331==    by 0x401774: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==6331==    by 0x40128C: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==6331==    by 0x54C6B44: (below main) (libc-start.c:287)
==6331== 
==6331== 1,208 bytes in 1 blocks are still reachable in loss record 2 of 2
==6331==    at 0x4C28CA0: malloc (vg_replace_malloc.c:299)
==6331==    by 0x4E4A08A: ??? (in /usr/lib/x86_64-linux-gnu/libxenctrl-4.4.so)
==6331==    by 0x4017CC: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==6331==    by 0x40128C: ??? (in /usr/lib/xen-4.4/bin/libxl-save-helper.orig)
==6331==    by 0x54C6B44: (below main) (libc-start.c:287)
==6331== 
==6331== LEAK SUMMARY:
==6331==    definitely lost: 0 bytes in 0 blocks
==6331==    indirectly lost: 0 bytes in 0 blocks
==6331==      possibly lost: 0 bytes in 0 blocks
==6331==    still reachable: 1,232 bytes in 2 blocks
==6331==         suppressed: 0 bytes in 0 blocks
==6331== 
==6331== For counts of detected and suppressed errors, rerun with: -v
==6331== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 1 from 1)

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