262100 2023-09-26 00:40:22 -0700 [GTK] webkit2gtk crashes at runtime when GDS mitigation is enabled 2023-09-26 00:42:51 -0700 1 1 1 Unclassified WebKit WebKit2 Other PC Linux NEW P2 Major --- 1 thomas-e-hansen+webkitbugzilla webkit-unassigned kkinnunen oldest_to_newest 1980087 0 467871 thomas-e-hansen+webkitbugzilla 2023-09-26 00:40:22 -0700 Created attachment 467871 systemd-logs of a crashing startup (GDS mitigation enabled) using builtins for avx(2) detection (behaviour is the same on unmodified install) When the Gather Data Sampling (GDS) mitigation in the Linux kernel is enabled, webkit2gtk will crash due to incomplete AVX2 enumeration. The mitigation is known to cause problems in these cases [1]. I tried rebuilding webkit2gtk while using the `__builtin_cpu_supports` functions instead of the bitshift checks in `JavaScriptCore/assembler/MacroAssemblerX86Common.cpp:collectCPUFeatures`, but unfortunately this does not seem to be sufficient to fix the issue. There are some further logs and discussion on the Arch bug tracker [2]. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=553a5c03e90a6087e88f8ff878335ef0621536fb [2]: https://bugs.archlinux.org/task/79444 1980089 1 467872 thomas-e-hansen+webkitbugzilla 2023-09-26 00:42:51 -0700 Created attachment 467872 Attempted, NON-FIXING patch 467871 2023-09-26 00:40:22 -0700 2023-09-26 00:40:22 -0700 systemd-logs of a crashing startup (GDS mitigation enabled) using builtins for avx(2) detection (behaviour is the same on unmodified install) gds-mitigation-enabled.log text/x-log 3962 thomas-e-hansen+webkitbugzilla QXVnIDI5IDE0OjA5OjAxIGFyY2hsaW51eCBrZXJuZWw6IExpbnV4IHZlcnNpb24gNi40LjExLWhh cmRlbmVkMS0xLWhhcmRlbmVkIChsaW51eC1oYXJkZW5lZEBhcmNobGludXgpIChnY2MgKEdDQykg MTMuMi4xIDIwMjMwODAxLCBHTlUgbGQgKEdOVSBCaW51dGlscykgMi40MS4wKSAjMSBTTVAgUFJF RU1QVF9EWU5BTUlDIFR1ZSwgMjIgQXVnIDIwMjMgMTk6MjQ6MTkgKzAwMDAKQXVnIDI5IDE0OjA5 OjAxIGFyY2hsaW51eCBrZXJuZWw6IENvbW1hbmQgbGluZTogcHRpPW9uIHBhZ2VfYWxsb2Muc2h1 ZmZsZT0xIEJPT1RfSU1BR0U9L3ZtbGludXotbGludXgtaGFyZGVuZWQgcm9vdD1VVUlEPTJjOTFm MzVhLTA3NmItNDQ1Yi04NjM1LTQzMmQ4YTJjMjAyZSBydyByZC5sdWtzLm5hbWU9OWY4ODVkNGMt MjQ5NS00ZTA4LWE2N2YtZjYxYmNiMGQzODFiPWNyeXB0cm9vdCByb290PS9kZXYvbWFwcGVyL2Ny eXB0cm9vdCBsb2dsZXZlbD0zIHF1aWV0IGluaXRyZD1caW5pdHJhbWZzLWxpbnV4LWhhcmRlbmVk LmltZwpbLi4uXQpBdWcgMjkgMTQ6MDk6MDEgYXJjaGxpbnV4IGtlcm5lbDogR0RTOiBNaWNyb2Nv ZGUgdXBkYXRlIG5lZWRlZCEgRGlzYWJsaW5nIEFWWCBhcyBtaXRpZ2F0aW9uLgpBdWcgMjkgMTQ6 MDk6MDEgYXJjaGxpbnV4IGtlcm5lbDogR0RTOiBNaXRpZ2F0aW9uOiBBVlggZGlzYWJsZWQsIG5v IG1pY3JvY29kZQpbLi4uXQpBdWcgMjkgMTQ6MDk6MTggc2tpZGJsYWRuaXIgbGlnaHRkbS13ZWJr aXQyLWdyZWV0ZXJbMTAyN106IGJ1aWx0aW5fY3B1X3N1cHBvcnRfYXZ4OiAwCkF1ZyAyOSAxNDow OToxOCBza2lkYmxhZG5pciBsaWdodGRtLXdlYmtpdDItZ3JlZXRlclsxMDI3XTogYnVpbHRpbl9j cHVfc3VwcG9ydF9hdngyOiAwCkF1ZyAyOSAxNDowOToxOCBza2lkYmxhZG5pciBrZXJuZWw6IHRy YXBzOiBsaWdodGRtLXdlYmtpdDJbMTAyN10gdHJhcCBpbnZhbGlkIG9wY29kZSBpcDo2MzY3ZDFl ODgyNTQgc3A6NzY0NGM2YzEyNjc4IGVycm9yOjAgaW4gbGliYXRvbWljLnNvLjEuMi4wWzYzNjdk MWU4NjAwMCszMDAwXQpBdWcgMjkgMTQ6MDk6MTggc2tpZGJsYWRuaXIgc3lzdGVtZFsxXTogQ3Jl YXRlZCBzbGljZSBTbGljZSAvc3lzdGVtL3N5c3RlbWQtY29yZWR1bXAuCkF1ZyAyOSAxNDowOTox OCBza2lkYmxhZG5pciBzeXN0ZW1kWzFdOiBTdGFydGVkIFByb2Nlc3MgQ29yZSBEdW1wIChQSUQg MTAzOS9VSUQgMCkuCkF1ZyAyOSAxNDowOToxOSBza2lkYmxhZG5pciBzeXN0ZW1kLWNvcmVkdW1w WzEwNDBdOiBQcm9jZXNzIDEwMjcgKGxpZ2h0ZG0td2Via2l0Mikgb2YgdXNlciA5NzIgZHVtcGVk IGNvcmUuClsuLi5dCkF1ZyAyOSAxNDowOToyMCBza2lkYmxhZG5pciBzeXN0ZW1kWzFdOiBsaWdo dGRtLnNlcnZpY2U6IFNjaGVkdWxlZCByZXN0YXJ0IGpvYiwgcmVzdGFydCBjb3VudGVyIGlzIGF0 IDEuCkF1ZyAyOSAxNDowOToyMCBza2lkYmxhZG5pciBzeXN0ZW1kWzFdOiBTdGFydGluZyBMaWdo dCBEaXNwbGF5IE1hbmFnZXIuLi4KQXVnIDI5IDE0OjA5OjIwIHNraWRibGFkbmlyIHN5c3RlbWRb MV06IFN0YXJ0ZWQgTGlnaHQgRGlzcGxheSBNYW5hZ2VyLgpBdWcgMjkgMTQ6MDk6MjAgc2tpZGJs YWRuaXIgc3lzdGVtZC1sb2dpbmRbOTMxXTogV2F0Y2hpbmcgc3lzdGVtIGJ1dHRvbnMgb24gL2Rl di9pbnB1dC9ldmVudDIwIChHbG92ZTgwIExlZnQgS2V5Ym9hcmQpCkF1ZyAyOSAxNDowOToyMCBz a2lkYmxhZG5pciBrZXJuZWw6IG5vdXZlYXUgMDAwMDowMTowMC4wOiBncjogaW50ciAwMDAwMDA0 MApBdWcgMjkgMTQ6MDk6MjEgc2tpZGJsYWRuaXIgbGlnaHRkbVsxMDY4XTogcGFtX3VuaXgobGln aHRkbS1ncmVldGVyOnNlc3Npb24pOiBzZXNzaW9uIG9wZW5lZCBmb3IgdXNlciBsaWdodGRtKHVp ZD05NzIpIGJ5ICh1aWQ9MCkKQXVnIDI5IDE0OjA5OjIxIHNraWRibGFkbmlyIHN5c3RlbWQtbG9n aW5kWzkzMV06IE5ldyBzZXNzaW9uIGMyIG9mIHVzZXIgbGlnaHRkbS4KQXVnIDI5IDE0OjA5OjIx IHNraWRibGFkbmlyIHN5c3RlbWRbMV06IFN0YXJ0ZWQgU2Vzc2lvbiBjMiBvZiBVc2VyIGxpZ2h0 ZG0uCkF1ZyAyOSAxNDowOToyMSBza2lkYmxhZG5pciBsaWdodGRtLXdlYmtpdDItZ3JlZXRlclsx MDcyXTogYnVpbHRpbl9jcHVfc3VwcG9ydF9hdng6IDAKQXVnIDI5IDE0OjA5OjIxIHNraWRibGFk bmlyIGxpZ2h0ZG0td2Via2l0Mi1ncmVldGVyWzEwNzJdOiBidWlsdGluX2NwdV9zdXBwb3J0X2F2 eDI6IDAKQXVnIDI5IDE0OjA5OjIxIHNraWRibGFkbmlyIGtlcm5lbDogdHJhcHM6IGxpZ2h0ZG0t d2Via2l0MlsxMDcyXSB0cmFwIGludmFsaWQgb3Bjb2RlIGlwOjY4MWJmMzM5NjI1NCBzcDo3NjMw MjVhMGFjZDggZXJyb3I6MCBpbiBsaWJhdG9taWMuc28uMS4yLjBbNjgxYmYzMzk0MDAwKzMwMDBd CkF1ZyAyOSAxNDowOToyMSBza2lkYmxhZG5pciBzeXN0ZW1kWzFdOiBTdGFydGVkIFByb2Nlc3Mg Q29yZSBEdW1wIChQSUQgMTA3NS9VSUQgMCkuCkF1ZyAyOSAxNDowOToyMSBza2lkYmxhZG5pciBz eXN0ZW1kLWNvcmVkdW1wWzEwNzZdOiBQcm9jZXNzIDEwNzIgKGxpZ2h0ZG0td2Via2l0Mikgb2Yg dXNlciA5NzIgZHVtcGVkIGNvcmUuClsuLi5dCkF1ZyAyOSAxNDowOToyMiBza2lkYmxhZG5pciBz eXN0ZW1kWzFdOiBsaWdodGRtLnNlcnZpY2U6IFNjaGVkdWxlZCByZXN0YXJ0IGpvYiwgcmVzdGFy dCBjb3VudGVyIGlzIGF0IDIuCkF1ZyAyOSAxNDowOToyMiBza2lkYmxhZG5pciBzeXN0ZW1kWzFd OiBTdGFydGluZyBMaWdodCBEaXNwbGF5IE1hbmFnZXIuLi4KQXVnIDI5IDE0OjA5OjIyIHNraWRi bGFkbmlyIHN5c3RlbWRbMV06IFN0YXJ0ZWQgTGlnaHQgRGlzcGxheSBNYW5hZ2VyLgpBdWcgMjkg MTQ6MDk6MjIgc2tpZGJsYWRuaXIga2VybmVsOiBub3V2ZWF1IDAwMDA6MDE6MDAuMDogZ3I6IGlu dHIgMDAwMDAwNDAKQXVnIDI5IDE0OjA5OjIzIHNraWRibGFkbmlyIGxpZ2h0ZG1bMTEwMl06IHBh bV91bml4KGxpZ2h0ZG0tZ3JlZXRlcjpzZXNzaW9uKTogc2Vzc2lvbiBvcGVuZWQgZm9yIHVzZXIg bGlnaHRkbSh1aWQ9OTcyKSBieSAodWlkPTApCkF1ZyAyOSAxNDowOToyMyBza2lkYmxhZG5pciBz eXN0ZW1kLWxvZ2luZFs5MzFdOiBOZXcgc2Vzc2lvbiBjMyBvZiB1c2VyIGxpZ2h0ZG0uCkF1ZyAy OSAxNDowOToyMyBza2lkYmxhZG5pciBzeXN0ZW1kWzFdOiBTdGFydGVkIFNlc3Npb24gYzMgb2Yg VXNlciBsaWdodGRtLgpBdWcgMjkgMTQ6MDk6MjMgc2tpZGJsYWRuaXIgbGlnaHRkbS13ZWJraXQy LWdyZWV0ZXJbMTEwNl06IGJ1aWx0aW5fY3B1X3N1cHBvcnRfYXZ4OiAwCkF1ZyAyOSAxNDowOToy MyBza2lkYmxhZG5pciBsaWdodGRtLXdlYmtpdDItZ3JlZXRlclsxMTA2XTogYnVpbHRpbl9jcHVf c3VwcG9ydF9hdngyOiAwCkF1ZyAyOSAxNDowOToyMyBza2lkYmxhZG5pciBrZXJuZWw6IHRyYXBz OiBsaWdodGRtLXdlYmtpdDJbMTEwNl0gdHJhcCBpbnZhbGlkIG9wY29kZSBpcDo2MTgzNThlMzMy NTQgc3A6Nzc1MGIwMjJlYWQ4IGVycm9yOjAgaW4gbGliYXRvbWljLnNvLjEuMi4wWzYxODM1OGUz MTAwMCszMDAwXQpBdWcgMjkgMTQ6MDk6MjMgc2tpZGJsYWRuaXIgc3lzdGVtZFsxXTogU3RhcnRl ZCBQcm9jZXNzIENvcmUgRHVtcCAoUElEIDExMDkvVUlEIDApLgpBdWcgMjkgMTQ6MDk6MjQgc2tp ZGJsYWRuaXIgc3lzdGVtZC1jb3JlZHVtcFsxMTEwXTogUHJvY2VzcyAxMTA2IChsaWdodGRtLXdl YmtpdDIpIG9mIHVzZXIgOTcyIGR1bXBlZCBjb3JlLgpbLi4uXQpBdWcgMjkgMTQ6MDk6MjQgc2tp ZGJsYWRuaXIgc3lzdGVtZC1sb2dpbmRbOTMxXTogUG93ZXIga2V5IHByZXNzZWQgc2hvcnQuCkF1 ZyAyOSAxNDowOToyNCBza2lkYmxhZG5pciBzeXN0ZW1kLWxvZ2luZFs5MzFdOiBQb3dlcmluZyBv ZmYuLi4KQXVnIDI5IDE0OjA5OjI0IHNraWRibGFkbmlyIHN5c3RlbWQtbG9naW5kWzkzMV06IFN5 c3RlbSBpcyBwb3dlcmluZyBkb3duLgpbLi4uXQo= 467872 2023-09-26 00:42:51 -0700 2023-09-26 00:42:51 -0700 Attempted, NON-FIXING patch test.patch text/plain 1800 thomas-e-hansen+webkitbugzilla ZGlmZiAtLWdpdCBhL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9hc3NlbWJsZXIvTWFjcm9Bc3NlbWJs ZXJYODZDb21tb24uY3BwIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL2Fzc2VtYmxlci9NYWNyb0Fz c2VtYmxlclg4NkNvbW1vbi5jcHAKaW5kZXggN2NhY2NiNDguLjE1YzZhYmE2IDEwMDY0NAotLS0g YS9Tb3VyY2UvSmF2YVNjcmlwdENvcmUvYXNzZW1ibGVyL01hY3JvQXNzZW1ibGVyWDg2Q29tbW9u LmNwcAorKysgYi9Tb3VyY2UvSmF2YVNjcmlwdENvcmUvYXNzZW1ibGVyL01hY3JvQXNzZW1ibGVy WDg2Q29tbW9uLmNwcApAQCAtMTAzNSwxMyArMTAzNSwxNCBAQCB2b2lkIE1hY3JvQXNzZW1ibGVy WDg2Q29tbW9uOjpjb2xsZWN0Q1BVRmVhdHVyZXMoKQogICAgIHN0YXRpYyBzdGQ6Om9uY2VfZmxh ZyBvbmNlS2V5OwogICAgIHN0ZDo6Y2FsbF9vbmNlKG9uY2VLZXksIFtdIHsKICAgICAgICAgewor ICAgICAgICAgICAgX19idWlsdGluX2NwdV9pbml0ICgpOwogICAgICAgICAgICAgQ1BVSUQgY3B1 aWQgPSBnZXRDUFVJRCgweDEpOwogICAgICAgICAgICAgc19zc2UzQ2hlY2tTdGF0ZSA9IChjcHVp ZFsyXSAmICgxIDw8IDApKSA/IENQVUlEQ2hlY2tTdGF0ZTo6U2V0IDogQ1BVSURDaGVja1N0YXRl OjpDbGVhcjsKICAgICAgICAgICAgIHNfc3VwcGxlbWVudGFsU1NFM0NoZWNrU3RhdGUgPSAoY3B1 aWRbMl0gJiAoMSA8PCA5KSkgPyBDUFVJRENoZWNrU3RhdGU6OlNldCA6IENQVUlEQ2hlY2tTdGF0 ZTo6Q2xlYXI7CiAgICAgICAgICAgICBzX3NzZTRfMUNoZWNrU3RhdGUgPSAoY3B1aWRbMl0gJiAo MSA8PCAxOSkpID8gQ1BVSURDaGVja1N0YXRlOjpTZXQgOiBDUFVJRENoZWNrU3RhdGU6OkNsZWFy OwogICAgICAgICAgICAgc19zc2U0XzJDaGVja1N0YXRlID0gKGNwdWlkWzJdICYgKDEgPDwgMjAp KSA/IENQVUlEQ2hlY2tTdGF0ZTo6U2V0IDogQ1BVSURDaGVja1N0YXRlOjpDbGVhcjsKICAgICAg ICAgICAgIHNfcG9wY250Q2hlY2tTdGF0ZSA9IChjcHVpZFsyXSAmICgxIDw8IDIzKSkgPyBDUFVJ RENoZWNrU3RhdGU6OlNldCA6IENQVUlEQ2hlY2tTdGF0ZTo6Q2xlYXI7Ci0gICAgICAgICAgICBz X2F2eENoZWNrU3RhdGUgPSAoY3B1aWRbMl0gJiAoMSA8PCAyOCkpID8gQ1BVSURDaGVja1N0YXRl OjpTZXQgOiBDUFVJRENoZWNrU3RhdGU6OkNsZWFyOworICAgICAgICAgICAgc19hdnhDaGVja1N0 YXRlID0gKF9fYnVpbHRpbl9jcHVfc3VwcG9ydHMgKCJhdngiKSkgPyBDUFVJRENoZWNrU3RhdGU6 OlNldCA6IENQVUlEQ2hlY2tTdGF0ZTo6Q2xlYXI7CiAgICAgICAgIH0KICNpZiBPUyhEQVJXSU4p CiAgICAgICAgIHsKQEAgLTEwNTcsNyArMTA1OCw3IEBAIHZvaWQgTWFjcm9Bc3NlbWJsZXJYODZD b21tb246OmNvbGxlY3RDUFVGZWF0dXJlcygpCiAgICAgICAgIHsKICAgICAgICAgICAgIENQVUlE IGNwdWlkID0gZ2V0Q1BVSUQoMHg3KTsKICAgICAgICAgICAgIHNfYm1pMUNoZWNrU3RhdGUgPSAo Y3B1aWRbMl0gJiAoMSA8PCAzKSkgPyBDUFVJRENoZWNrU3RhdGU6OlNldCA6IENQVUlEQ2hlY2tT dGF0ZTo6Q2xlYXI7Ci0gICAgICAgICAgICBzX2F2eDJDaGVja1N0YXRlID0gKGNwdWlkWzJdICYg KDEgPDwgNSkpID8gQ1BVSURDaGVja1N0YXRlOjpTZXQgOiBDUFVJRENoZWNrU3RhdGU6OkNsZWFy OworICAgICAgICAgICAgc19hdngyQ2hlY2tTdGF0ZSA9IChfX2J1aWx0aW5fY3B1X3N1cHBvcnRz ICgiYXZ4MiIpKSA/IENQVUlEQ2hlY2tTdGF0ZTo6U2V0IDogQ1BVSURDaGVja1N0YXRlOjpDbGVh cjsKICAgICAgICAgfQogI2VuZGlmCiAgICAgICAgIHsK