looks like there is a small residual crash of about 1-6 crashes every few days on 4.0betas with millions of users, but a volume regression looks like it might have started on this mar2 in builds from march1. memcpy...nsCacheMetaData::SetElement.char.const.,.char.const.. date total breakdown by build crashes count build, count build, ... 20110301 20110302 4 4.0b13pre2011030103 4 , 20110303 20110304 2 4.0b13pre2011030103 2 , 20110305 3 2 4.0b13pre2011030403, 1 4.0b13pre2011030103, 20110306 5 4 4.0b13pre2011030503, 1 4.0b13pre2011030603, 20110307 3 2 4.0b13pre2011030703, 1 4.0b112011020314, 20110308 15 9 4.0b13pre2011030703, 3 4.0b13pre2011030803, 3 4.0b13pre2011030603, stack looks like https://crash-stats.mozilla.com/report/index/7099852a-a0bd-4879-b102-281122110309 Frame Module Signature [Expand] Source 0 mozcrt19.dll memcpy memcpy.asm:198 1 xul.dll nsCacheMetaData::SetElement netwerk/cache/nsCacheMetaData.cpp:98 2 nspr4.dll PR_Lock nsprpub/pr/src/threads/combined/prulock.c:233 3 xul.dll xul.dll@0x19b89f 4 xul.dll nsCacheEntryDescriptor::SetMetaDataElement netwerk/cache/nsCacheEntryDescriptor.cpp:496 5 xul.dll nsHttpChannel::AddCacheEntryHeaders netwerk/protocol/http/nsHttpChannel.cpp:3063 6 kernel32.dll kernel32.dll@0x4bbe5 7 nspr4.dll PR_NormalizeTime nsprpub/pr/src/misc/prtime.c:488 8 nspr4.dll PR_AttachThread nsprpub/pr/src/threads/prcthr.c:174 9 nspr4.dll PR_ImplodeTime nsprpub/pr/src/misc/prtime.c:273 10 xul.dll nsTArray<nsStyleContext*,nsTArrayDefaultAllocator>::RemoveElementsAt obj-firefox/dist/include/nsTArray.h:835 11 nspr4.dll PR_AssertCurrentThreadOwnsLock nsprpub/pr/src/threads/combined/prulock.c:404 12 xul.dll nsCacheEntryDescriptor::SetExpirationTime netwerk/cache/nsCacheEntryDescriptor.cpp:175 13 xul.dll nsHttpChannel::UpdateExpirationTime netwerk/protocol/http/nsHttpChannel.cpp:2407 14 xul.dll nsHttpChannel::InitCacheEntry netwerk/protocol/http/nsHttpChannel.cpp:2943 15 xul.dll nsHttpChannel::ContinueProcessNormal netwerk/protocol/http/nsHttpChannel.cpp:1189 16 mozcrt19.dll arena_dalloc obj-firefox/memory/jemalloc/crtsrc/jemalloc.c:4291 17 mozcrt19.dll arena_dalloc_small obj-firefox/memory/jemalloc/crtsrc/jemalloc.c:4213 18 mozcrt19.dll arena_dalloc obj-firefox/memory/jemalloc/crtsrc/jemalloc.c:4291 19 user32.dll user32.dll@0x1c332 20 xul.dll nsHttpChannelAuthProvider::`scalar deleting destructor' more reports at https://crash-stats.mozilla.com/report/list?signature=memcpy%20|%20nsCacheMetaData::SetElement%28char%20const*,%20char%20const*%29

not enough here to block on yet, but I suspect it could go higher in volume as more people get post b12 builds.

memcpy...nsCacheMetaData::SetElement.char.const.,.char.const.. crashes pct. all 355934 15 4.21426e-05 4.0b13pre 1374 15 0.010917 os breakdown memcpy...nsCacheMetaData::SetElement.char.const.,.char.const..Total 15 Win5.1 0.00 Win6.0 0.27 Win6.1 0.73 urls for testing 4 http://www.thefind.com/search?query=corner+desk+design&filter%5Bquery%5D=corner+desk+design&filter[category]=office 4 \N 3 http://www.skroutz.gr/s/322720/Toshiba-Satellite-L650-1NC.html 1 http://www.skroutz.gr/search?from=suggest&keyphrase=Toshiba%20Satellite%20L650-1NC 1 http://www.popphoto.com/interstitial-ad/ad 1 http://www.mywot.com/scorecard/ninjalane.com 1 http://projects.apathyant.com/wikipediainline/

Michal, Bjarne, Jason, etc..., this looks like it started happening very recently. I don't know of anything that changed anywhere near the cache code, but please do have a look. If this spikes badly we may choose to hold the release for this, so the more we know up front the better.

Dup of 529733?

Yup, I think so. Michal et al, please speak up if you disagree.