1313624 - Large 293MB XHR throws "allocation size overflow" error on accessing xhr.responseText

Status: RESOLVED DUPLICATE of bug 1509542

(Core :: JavaScript Engine, defect, P3)

Description

[Jukka Jylänki]

STR:

1. Download http://clb.demon.fi/bugs/large_xhr_allocation_size_overflow/UnrealEngine4_Development_SafeHeap.7z

2. Uncompress (it is LZMA2), and run python -m SimpleHTTPServer in the directory, and open http://localhost:8000/MyProject.html in browser. (64-bit browser is preferred)

Observed:

Accessing the result of the XHR throws an exception "allocation size overflow" inside jQuery, when it is reading the xhr.responseText property. Happens on both FF Stable 49 and current Nightly.

Expected:

The test system has 32GB of RAM, it should easily be able to handle a 300MB JS file in a 64-bit browser. (not expecting this to not OOM on a 32-bit browser though)

Comment 1

[Olli Pettay [:smaug][[e-mail]]]

"allocation size overflow" is a JS engine message, so tentatively -> JS Engine.

That file is probably in utf8, and the data will be converted to utf16, so 2x memory, but should still be fine.

Comment 2

[Jan de Mooij [:jandem]]

Bug 1509542 should alleviate this by raising our string length limit.

Comment 3

[Jan de Mooij [:jandem]]

I'll actually just close this as duplicate. Our limit is now 1 GB instead of 256 MB and is similar to Chrome. Good enough for now I expect.