533736 - Firefox 3.5.6 throwing malloc errors

Status: NEW

(Firefox :: General, defect)

Description

[John O'Duinn [:joduinn] (please use "needinfo?" flag)]

Using Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5

Since moving from 3.5.4 -> 3.5.5, I'm hitting hangs-when-resuming-laptop, or hangs-when-left-idle for meeting/lunch approx once a day or so. I found a lot of identical malloc errors in /var/system/log like this:
...
Dec  6 23:56:11 Macintosh-7 firefox-bin[1287]:
firefox-bin(1287,0xa02ee720) malloc: *** mmap(size=33554432) failed
(error code=12)\n*** error: can't allocate region\n*** set a breakpoint
in malloc_error_break to debug
Dec  6 23:56:14: --- last message repeated 1612 times --- 
...

Note: My mac has 3gb ram.
Note: I'm running with ~300 tabs/windows. This is a lot, but afaict, this has been working just fine on this same machine using FF3.5.3 and before. Is there a regression in FF3.5.4/FF3.5.5?

Not sure where to file this, but after discussions offline, have been asked to file this here for triage. Please DUP or reassign as appropriate.

Comment 1

[John O'Duinn [:joduinn] (please use "needinfo?" flag)]

Still hitting this, even after upgrading to FF3.5.6

Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6

Dec 24 03:58:07 Macintosh-7 firefox-bin[4724]: firefox-bin(4724,0xa02f7720) malloc: *** mmap(size=33554432) failed (error code=12)\n*** error: can't allocate region\n*** set a breakpoint in malloc_error_break to debug
Dec 24 03:58:37: --- last message repeated 38508 times ---
Dec 24 03:58:36 Macintosh-7 firefox-bin[4724]: firefox-bin(4724,0xa02f7720) malloc: *** mmap(size=33554432) failed (error code=12)\n*** error: can't allocate region\n*** set a breakpoint in malloc_error_break to debug
Dec 24 03:58:44: --- last message repeated 5193 times ---