168259 2017-02-13 15:23:56 -0800 asyncDisassembly crashes on iOS 2017-02-13 17:10:31 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 msaboff msaboff commit-queue keith_miller mark.lam saam oldest_to_newest 1276401 0 msaboff 2017-02-13 15:23:56 -0800 It crashes with Bus Error right after emitting the jitWrite thunk. Looks like this is due to the mapping of the jitWrite thunk pages being changed to execute only immediately after generating and linking the code. With async disassembly, we can't read the code to disassemble. <rdar://problem/30124488> 1276404 1 301401 msaboff 2017-02-13 15:30:24 -0800 Created attachment 301401 Patch 1276461 2 msaboff 2017-02-13 17:10:31 -0800 Committed r212262: <http://trac.webkit.org/changeset/212262> 301401 2017-02-13 15:30:24 -0800 2017-02-13 15:32:45 -0800 Patch 168259.patch text/plain 1986 msaboff SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjEyMjU1KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE3IEBA CisyMDE3LTAyLTEzICBNaWNoYWVsIFNhYm9mZiAgPG1zYWJvZmZAYXBwbGUuY29tPgorCisgICAg ICAgIGFzeW5jRGlzYXNzZW1ibHkgY3Jhc2hlcyBvbiBpT1MKKyAgICAgICAgaHR0cHM6Ly9idWdz LndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE2ODI1OQorCisgICAgICAgIFJldmlld2VkIGJ5 IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEVsaW1pbmF0ZWQgdGhlIGR1bXBpbmcgb2YgIHRo ZSBkaXNhc3NlbWJseSBmb3IgdGhlIEpJVCB3cml0ZSB0aHVuay4KKyAgICAgICAgTm90IG9ubHkg ZG9lcyBpdCBmaXggdGhlIGNyYXNoLCBidXQgZ2l2ZW4gdGhlIG5hdHVyZSBvZiB0aGUgSklUCisg ICAgICAgIHdyaXRlIHRodW5rLCB3ZSBwcm9iYWJseSBkb24ndCB3YW50IHRvIGRpc2Fzc2VtYmxl IGl0IGFueXdheS4KKyAgICAgICAgCisgICAgICAgICogaml0L0V4ZWN1dGFibGVBbGxvY2F0b3JG aXhlZFZNUG9vbC5jcHA6CisgICAgICAgIChKU0M6OkZpeGVkVk1Qb29sRXhlY3V0YWJsZUFsbG9j YXRvcjo6aml0V3JpdGVUaHVua0dlbmVyYXRvcik6CisKIDIwMTctMDItMTIgIFJ5b3N1a2UgTml3 YSAgPHJuaXdhQHdlYmtpdC5vcmc+CiAKICAgICAgICAgQyBsb29wIGJ1aWxkIGZpeCBhdHRlbXB0 IGFmdGVyIHIyMTIyMDcuCkluZGV4OiBTb3VyY2UvSmF2YVNjcmlwdENvcmUvaml0L0V4ZWN1dGFi bGVBbGxvY2F0b3JGaXhlZFZNUG9vbC5jcHAKPT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291cmNlL0phdmFTY3Jp cHRDb3JlL2ppdC9FeGVjdXRhYmxlQWxsb2NhdG9yRml4ZWRWTVBvb2wuY3BwCShyZXZpc2lvbiAy MTE5NjIpCisrKyBTb3VyY2UvSmF2YVNjcmlwdENvcmUvaml0L0V4ZWN1dGFibGVBbGxvY2F0b3JG aXhlZFZNUG9vbC5jcHAJKHdvcmtpbmcgY29weSkKQEAgLTI2OSw3ICsyNjksMTIgQEAgcHJpdmF0 ZToKICAgICAgICAgaml0LnJldCgpOwogCiAgICAgICAgIExpbmtCdWZmZXIgbGlua0J1ZmZlcihq aXQsIHN0dWJCYXNlLCBzdHViU2l6ZSk7Ci0gICAgICAgIHJldHVybiBGSU5BTElaRV9DT0RFKGxp bmtCdWZmZXIsICgiQnVsbGV0cHJvb2YgSklUIHdyaXRlIHRodW5rIikpOworICAgICAgICAvLyBX ZSBkb24ndCB1c2UgRklOQUxJWkVfQ09ERSgpIGZvciB0d28gcmVhc29ucy4KKyAgICAgICAgLy8g VGhlIGZpcnN0IGlzIHRoYXQgd2UgZG9uJ3Qgd2FudCB0aGUgd3JpdGVhYmxlIGFkZHJlc3MsIGFz IGRpc2Fzc2VtYmxlZCBpbnN0cnVjdGlvbnMsCisgICAgICAgIC8vIHRvIGFwcGVhciBpbiB0aGUg Y29uc29sZSBvciBhbnl3aGVyZSBpbiBtZW1vcnksIHZpYSB0aGUgUHJpbnRTdHJlYW0gYnVmZmVy LgorICAgICAgICAvLyBUaGUgc2Vjb25kIGlzIHdlIGNhbid0IGd1YXJhbnRlZSB0aGF0IHRoZSBj b2RlIGlzIHJlYWRhYmxlIHdoZW4gdXNpbmcgdGhlCisgICAgICAgIC8vIGFzeW5jRGlzYXNzZW1i bHkgb3B0aW9uIGFzIG91ciBjYWxsZXIgd2lsbCBzZXQgb3VyIHBhZ2VzIGV4ZWN1dGUgb25seS4K KyAgICAgICAgcmV0dXJuIGxpbmtCdWZmZXIuZmluYWxpemVDb2RlV2l0aG91dERpc2Fzc2VtYmx5 KCk7CiAgICAgfQogI2Vsc2UgLy8gQ1BVKEFSTTY0KSAmJiBVU0UoRVhFQ1VURV9PTkxZX0pJVF9X UklURV9GVU5DVElPTikKICAgICBzdGF0aWMgdm9pZCBnZW5lcmljV3JpdGVUb0pJVFJlZ2lvbihv ZmZfdCBvZmZzZXQsIGNvbnN0IHZvaWQqIGRhdGEsIHNpemVfdCBkYXRhU2l6ZSkK