276437 - Browser locks up

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[Fernando Mendes]

Hello,

I was browsing from a link in http://pensadoresbrasileiros.home.comcast.net/ 
pointing to http://aletraescarlate.blig.ig.com.br/inicial.html
and the browser froze up.

I then fired up Visual Studio's debug and noticed the cpu was trapped in the 
following loop:

Point A:

00627FF6 8B 4B 28         mov         ecx,dword ptr [ebx+28h]
00627FF9 8B 43 08         mov         eax,dword ptr [ebx+8] 
00627FFC C1 E9 0C         shr         ecx,0Ch 
00627FFF EB 0A            jmp         0062800B 
00628001 3B C6            cmp         eax,esi 
00628003 74 12            je          00628017 
00628005 89 45 F4         mov         dword ptr [ebp-0Ch],eax 
00628008 8B 40 20         mov         eax,dword ptr [eax+20h] 
0062800B 49               dec         ecx  
0062800C 79 F3            jns         00628001 
0062800E 8B 1B            mov         ebx,dword ptr [ebx] 
00628010 8D 47 38         lea         eax,[edi+38h] 
00628013 3B D8            cmp         ebx,eax 
00628015 75 DF            jne         00627FF6 

at this point it went back to point A.

Then I forced it to proceed to the code below instead of executing jne 00627FF6 
and I was able to regain control of the browser and close it. 

00628017 8D 47 38         lea         eax,[edi+38h] 
0062801A 3B D8            cmp         ebx,eax 
0062801C 75 0A            jne         00628028 
0062801E B8 05 40 00 80   mov         eax,80004005h 
00628023 E9 76 01 00 00   jmp         0062819E 
00628028 8D 47 38         lea         eax,[edi+38h] 
0062802B 3B D8            cmp         ebx,eax 
0062802D 89 45 F0         mov         dword ptr [ebp-10h],eax 
00628030 0F 84 2E 01 00 00 je          00628164 

After that, I was able to switch to any of the other tabs I had open (about 5) 
except the one that triggered the problem. It did not browse anymore or respond 
to other commands such as bookmark/save page, so I closed the browser.

Hope this helps.

Regards,
Fernando

Comment 1

[Olivier Cahagne]

According to http://web-sniffer.net/
The page http://aletraescarlate.blig.ig.com.br/index.html is compressed with
Gzip and is about 5.7MB once uncompressed, it could explain why Firefox locks up
for a few seconds before displaying the page.
Once loaded, the page displays fine and works ok.