1286946 - Certain reg exp makes the browser very slow

Status: RESOLVED DUPLICATE of bug 1276626

(Core :: JavaScript Engine, defect)

Description

[iammaxmaxmaximus]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36

Steps to reproduce:

this is work
"qqqqqqqqqqqqqqqq wwwwwwwwwwwwwww".replace(/\w+(\w+(=('|").*\3)?\s*)*/, '')

this crash browser (i add > to the regExp end)
"qqqqqqqqqqqqqqqq wwwwwwwwwwwwwww".replace(/\w+(\w+(=('|").*\3)?\s*)*>/, '')

Comment 1

[Tooru Fujisawa [:arai]]

it takes long time and pops up "slow script dialog", and it could result in executing RegExp in interpreter, and takes much more time.
so it should be related to bug 1276626.

but It doesn't cause crash for me.

Comment 2

[Tooru Fujisawa [:arai]]

Do you have crash report ID for the crash?

https://support.mozilla.org/en-US/kb/mozillacrashreporter

Comment 3

[iammaxmaxmaximus]

no, this chash charhed in all browsers

Comment 4

[Tooru Fujisawa [:arai]]

(In reply to iammaxmaxmaximus from comment #3)
> no, this chash charhed in all browsers

Sorry, what do you mean?

Comment 5

[iammaxmaxmaximus]

Sorry, i from Russia, and use translator), i no understand your question =)

Comment 6

[Tooru Fujisawa [:arai]]

I want a "Crash Report" of the RegExp crash.

Please follow this document.
https://support.mozilla.org/ru/kb/otchet-o-padeniyah-mozilla

Then
  1. do comment #0 in browser
  2. (when browser crash) submit a crash report
  3. post the "Report ID" here

Comment 7

[iammaxmaxmaximus]

its not crash its very slow, and user needs restart browser, cuz another tabs not works TOO

Comment 8

[Tooru Fujisawa [:arai]]

Thank you :)

Then, it is the same bug as bug 1276626.