154457 2016-02-19 09:28:14 -0800 Modern IDB: Crash seen under fireEventListeners in IDB code 2016-03-25 15:55:54 -0700 1 1 1 Unclassified WebKit WebCore Misc. Safari 9 Unspecified Unspecified RESOLVED FIXED P2 Normal --- 149117 1 beidson webkit-unassigned oldest_to_newest 1166434 0 beidson 2016-02-19 09:28:14 -0800 Modern IDB: Crash seen under fireEventListeners in IDB code https://build.webkit.org/results/Apple%20Yosemite%20Release%20WK1%20(Tests)/r196819%20(12196)/storage/indexeddb/opencursor-key-crash-log.txt 1166482 1 beidson 2016-02-19 11:51:16 -0800 Crash log clearly shows something is null but... it's unclear to me what (release build so there's inlining) 1169733 2 beidson 2016-03-01 21:52:06 -0800 AFAIK, we haven't seen this in high numbers - just this report. It's a release build, and therefore optimized, and therefore the backtrace probably does not tell the whole story. I suspect the explanation could be the "thread safety in IDBDatabaseInfo" issue that I fixed earlier today in http://trac.webkit.org/changeset/197405 Because of the low frequency and the possibility that this is already fixed, I"m reversing the blocking relationship with the master bug. 1178156 3 beidson 2016-03-25 15:55:54 -0700 This was almost certainly the afore mentioned thread safety issue, and hasn't shown up since.