Re: Segment fault when using wireless (adhoc mode)

[Dan Williams <dcbw redhat com>]

On Mon, 2009-03-02 at 15:44 +0800, 陈杰 wrote:
> Hi, all
> I've tried NM-0.7.1-rc1 and NM-0.7.1-rc2, and find that using wireless
> (adhoc mode) makes NM easily be terminated by signal 11.
> 
> Following the log , I've seen two or more "Stage 5 of 5 ... commit"
> sections (which were outputed by the function
> <nm_device_activate_stage5_ip_config_commit>) were ouputed one by one.
> In the last "Stage 5 of 5 ... commit" section, NM said it recived
> signal 11.

Hmm; what kind of IPv4 addressing method are you using on the adhoc
connection?  I didn't have a problem with the "Shared to other
computers" method this morning, but there may well be refcounting issues
with Manual or Automatic.

Dan

> Adding more log output code to the source of NM, I found the
> following:
> 1) In the first call of <nm_device_activate_stage5_ip_config_commit>,
> the ref_count of the instance ip4_config increased by 2 (by the func
> <nm_device_set_ip4_config>), but decreased by 1 (nm-device.c, line
> 1438, "g_object_unref (ip4_config)")
> 
> 2) In the following sequence calls of
> <nm_device_activate_stage5_ip_config_commit>, the ref_count of the
> *same* ip4_config decreased by 1 each call.
> 
> 3) At last, the ref_count of the instance ip4_config reached zero
> (then ip4_config was freed), but a following call of
> <nm_device_activate_stage5_ip_config_commit> accessed this ip4_config,
> then NM was terminated by SIGSEGV.
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