1205056 - Firefox constantly hangs in msvcr120.dll

Status: NEW

(Core :: General, defect)

Description

[Sergey Popov]

User Agent: Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240

Steps to reproduce:

No specific scenario. The problem occurs every 5-10 minutes.
- Windows 10
- Firefox 40.0.3; also occur on beta 41 (15.9.2015)
- Core 2 DUO, 2 Gb RAM


Actual results:

The function _get_flsindex() from msvcr.dll take 40-60% CPU. At this time Firefox does not response.

Comment 1

[Lance Wahrdol]

I'm experiencing the same issue but on a different operating system namely Windows Vista.

Also, thank you for your hard work guys.  Keep it up.

Comment 2

[u554753]

Hi Sergey, 

-Could you try and reproduce this bug on the newest build of Nightly 45.0a1?

-If so, can you provide steps on how to access the msvcr.dll file and the function? 

Thanks!

Comment 3

[Sergey Popov]

I tried Nightly 45.0a1 - same problem.
The is no scenario.
One time I open new tab and get 'Not responding' for Firefox window; Process Explorer shows 52% CPU for Firefox of them 44% takes _get_flsindex().
Next time, 'Not responding' causes when I press 'Allow and Remember' for flash player.

Comment 4

[Sergey Popov]

FYI: on same PC other browsers do not have the problem. Not only Chrome, but also Gecko-based Palemoon.

Comment 5

[Sergey Popov]

FYI: on same PC other browsers do not have the problem. Not only Chrome, but also Gecko-based Palemoon.
On PC with 16 Gb RAM the problem, even if there is, is not felt.