179037 2017-10-30 16:35:09 -0700 Crash in: com.apple.WebKit: WebKit::CacheStorage::Caches::initializeSize(WTF::Function<void (std::optional<WebCore::DOMCacheEngine::Error>&&)>&&) + 30 (CacheStorageEngineCaches.cpp:163) 2017-11-28 16:18:00 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=178944 InRadar P2 Normal --- 1 jlewis3 youennf buildbot cdumez cgarcia commit-queue webkit-bug-importer youennf oldest_to_newest 1366224 0 jlewis3 2017-10-30 16:35:09 -0700 There was a flaky crash introduced after revision r224132 https://trac.webkit.org/changeset/224132/webkit The first test the flaky crash showed up on was: imported/w3c/web-platform-tests/service-workers/service-worker/fetch-event-within-sw.https.html first build: https://build.webkit.org/results/Apple%20El%20Capitan%20Release%20WK2%20(Tests)/r224136%20(5579)/results.html https://build.webkit.org/builders/Apple%20El%20Capitan%20Release%20WK2%20(Tests)/builds/5579 The test also is a flaky failure on all platforms. Attached is the crash log. 1366229 1 cdumez 2017-10-30 16:39:02 -0700 *** This bug has been marked as a duplicate of bug 179035 *** 1366280 2 youennf 2017-10-30 18:56:18 -0700 Reopening to attach new patch. 1366281 3 325408 youennf 2017-10-30 18:56:19 -0700 Created attachment 325408 Patch 1366284 4 325408 cdumez 2017-10-30 19:05:12 -0700 Comment on attachment 325408 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=325408&action=review > Source/WebKit/NetworkProcess/cache/CacheStorageEngineCaches.cpp:136 > + storeOrigin([protectedThis = makeRef(*this), this, callback = WTFMove(callback)] (std::optional<Error>&& error) mutable { Why don't you need the same in readCachesFromDisk() below? 1366287 5 325408 cdumez 2017-10-30 19:10:16 -0700 Comment on attachment 325408 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=325408&action=review >> Source/WebKit/NetworkProcess/cache/CacheStorageEngineCaches.cpp:136 >> + storeOrigin([protectedThis = makeRef(*this), this, callback = WTFMove(callback)] (std::optional<Error>&& error) mutable { > > Why don't you need the same in readCachesFromDisk() below? You initialized m_storage above, but what if somebody calls clearMemoryRepresentation() before your lambda gets called? Your lambda uses m_storage without null checking it and the crash log show it is dereferencing null. 1366288 6 youennf 2017-10-30 19:17:12 -0700 (In reply to Chris Dumez from comment #4) > Comment on attachment 325408 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=325408&action=review > > > Source/WebKit/NetworkProcess/cache/CacheStorageEngineCaches.cpp:136 > > + storeOrigin([protectedThis = makeRef(*this), this, callback = WTFMove(callback)] (std::optional<Error>&& error) mutable { > > Why don't you need the same in readCachesFromDisk() below? I got too fast, storeOrigin lambda does not protect this since it is done within storeOrigin implementation, like readCachesFromDisk. 1366289 7 youennf 2017-10-30 19:17:24 -0700 > You initialized m_storage above, but what if somebody calls > clearMemoryRepresentation() before your lambda gets called? Your lambda uses > m_storage without null checking it and the crash log show it is > dereferencing null. That is probably the actual issue. 1366460 8 325461 youennf 2017-10-31 11:14:30 -0700 Created attachment 325461 Patch 1366528 9 325461 commit-queue 2017-10-31 13:20:15 -0700 Comment on attachment 325461 Patch Clearing flags on attachment: 325461 Committed r224240: <https://trac.webkit.org/changeset/224240> 1366529 10 commit-queue 2017-10-31 13:20:16 -0700 All reviewed patches have been landed. Closing bug. 1372195 11 webkit-bug-importer 2017-11-15 12:35:36 -0800 <rdar://problem/35567834> 1375591 12 youennf 2017-11-28 16:18:00 -0800 *** Bug 179035 has been marked as a duplicate of this bug. *** 325408 2017-10-30 18:56:19 -0700 2017-10-31 11:14:29 -0700 Patch bug-179037-20171030185619.patch text/plain 4655 youennf U3VidmVyc2lvbiBSZXZpc2lvbjogMjI0MjE3CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IGIyNGQ4MzQyZWU4M2ZhZTY0 N2VjYmJmYmI5ZDE5YTdmODg5YmZmNDAuLmY1MjAyZjk4OWM2NDYxMzAyY2RjYWE4OTAwMGQyMDk4 OWVjYmIzNmIgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTMgQEAKKzIwMTctMTAtMzAgIFlvdWVubiBG YWJsZXQgIDx5b3Vlbm5AYXBwbGUuY29tPgorCisgICAgICAgIENyYXNoIGluOiAgY29tLmFwcGxl LldlYktpdDogV2ViS2l0OjpDYWNoZVN0b3JhZ2U6OkNhY2hlczo6aW5pdGlhbGl6ZVNpemUoV1RG OjpGdW5jdGlvbjx2b2lkIChzdGQ6Om9wdGlvbmFsPFdlYkNvcmU6OkRPTUNhY2hlRW5naW5lOjpF 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