running low on vm reserve

[eleven110807]

Hello,

 I run firefox with my DR client, but I'm getting a "running low on vm reserve" ,then a "segmentation fault".
Why am I getting this message? How do I fix it?

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Best Regards~
Liang Shuhuan

[Derek Bruening]

On Wed, Apr 18, 2012 at 3:33 AM, eleven110807 <eleven...@163.com> wrote:

 I run firefox with my DR client, but I'm getting a "running low on vm reserve"

This is just a warning that can usually be ignored.

 

,then a "segmentation fault".
Why am I getting this message? How do I fix it?

Probably a bug in your client; possibly one in DR, but you're not providing nearly enough information to act on.  See http://code.google.com/p/dynamorio/wiki/Debugging

- Derek

[Reid Kleckner]

On Wed, Apr 18, 2012 at 9:54 AM, Derek Bruening <brue...@google.com> wrote:

On Wed, Apr 18, 2012 at 3:33 AM, eleven110807 <eleven...@163.com> wrote:

 I run firefox with my DR client, but I'm getting a "running low on vm reserve"

This is just a warning that can usually be ignored.

DR reserves a chunk of address space during initialization, and if that's not enough, it will print this warning and request more memory from the OS.

This can be caused by having a really large application (like Firefox), or by allocating a lot of memory in the client.  Typically I see this warning in DrMemory because we use drsyms which loads debug info which is very large.

It's hard to say if the memory usage can be avoided without doing some analysis of what's being allocated and why.

Reid

[eleven110807]

I did my best to find the error in my client, but still not succeed.
Is there a option to set the vm size reserved? How do I use Windbg to check the vm size?
 
Thanks a lot.

--
Best Regards~
Liang Shuhuan

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网易Lofter，专注兴趣，分享创作！

[Reid Kleckner]

Raising the reservation size shouldn't be necessary.  DynamoRIO will request more memory automatically.  The warning is just there to indicate that DR is using an unusually large amount of memory.

The cause of your segmentation fault is likely elsewhere.  See the tips Derek mentioned here:

http://code.google.com/p/dynamorio/wiki/Debugging

You're already using a debug build (since you're getting the warning).  I'd recommend trying:

- Try running without any client to isolate where the error is

- Logging can be enabled with -loglevel N. Logs are written to DR-install/logs/.

Make sure you can run Firefox under plain DR (no client) first, then try to figure out what your client is doing before it crashes.  We'd be very interested to hear if you can't run Firefox under plain DR, that would be a bug you could file in our tracker.

Alternatively, try running your client on a smaller app first.

Reid

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