278016 2024-08-13 02:36:07 -0700 REGRESSION(275829@main): [GTK] PSON improperly enabled by default in GTK 3 API versions 2024-09-23 12:56:31 -0700 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 enometh webkit-unassigned aperez bugs-noreply cgarcia enometh mcatanzaro webkit-bug-importer oldest_to_newest 2052323 0 472131 enometh 2024-08-13 02:36:07 -0700 Created attachment 472131 log for 2.46.5 with webext-surf When a new webprocess is swapped in, it appears to be unable to communicate with the ui process. typically the page-created is used to communicate to the parent process to negotiate an IPC channel and/or register the page-id for further communication, this seems to be failing, and messages and IPC to the parent process seem to be dropped. For a concrete case consider the suckless surf browser git://git.suckless.org/surf branch origin/surf-webkit2 commit 9ef79bf7106496c736, patchs (to make it use webkit2gtk-4.1), and add some debugging messages. weburf-ext.c uses usermessages to communicate with the ui process and get a ipc fd for further communications, it provides minimal functionality by implementing scrolling via javascript. To show the problem I use these steps first with with webkit-2.43.1 and then with webkit-2.45.6. 1. run "surf webkit://gpu" 2. Ctrl-g , enter "file:///tmp" (to navigate to a new url with pages of scroll) 3. type Ctrl-SPC Ctrl-b to scroll the page (via the extension) There is no process swapping im 2.43.1, and in the step where the communication is supposed to happen in webext-surf.c:(pagecreated), i see a ``` Unhandled message WebPageProxy_SendMessageToWebViewWithReply from provisional process ``` The UI process doesn't see any message from the the web process. Other browsers that use IPC without webkit user messages also seem to be unable to communicate with the ui process (through unix send() on a unix socket). The ui process cannot get to know how to contact the webprocess, though the new WebPage is reflected in the WebView page-id. I'll be glad to supply more information and logs if needed. Can you spot if surf is doing something wrong? or perhaps "process suspension" stops the IPC messaging somehow 2052350 1 mcatanzaro 2024-08-13 06:47:38 -0700 If your process is suspended, it wouldn't be able to send messages at all. It uses SIGSTOP/SIGCONT. 2052374 2 472140 enometh 2024-08-13 08:37:13 -0700 Created attachment 472140 patch for the surf browser mentioned in comment 1 (needed if surf is to be used to bisect) 2052379 3 mcatanzaro 2024-08-13 08:59:36 -0700 I checked the surf source code, and I don't think it enables PSON at all. 2058112 4 enometh 2024-09-05 21:42:06 -0700 Changing the Summary is misleading, It is true that the immediate regression is that pson is getting enabled on 4.1 api, where is should not be enabled. But the problem I'm reporting is a bug in the IPC when PSON is enabled. "[Bug 278016] 2.45.6 communication with web processes under PSON" The choice of my test case is unfortunate since surf is not set up for pson and IPC, but the problem I want to demonstrate here is when the security context changes, a new extension process is created, and a new page is created in the extension process, but user mesages sent when by the web page to the ui process are not being delivered. at the point the new page is created in the extension process, other IPC mechanisms like send(2) to the UI process also fail 2058207 5 mcatanzaro 2024-09-06 08:17:30 -0700 Your original summary here was "2.45.6 communication with web processes under PSON" which describes a topic rather than a bug. Feel free to reword it. 2058208 6 mcatanzaro 2024-09-06 08:18:03 -0700 BTW: next step here is for somebody to bisect and figure out when this broke. 2062269 7 472637 enometh 2024-09-23 02:38:10 -0700 Created attachment 472637 fix unconditional pson on 4.1 api I spotted this with a git grep psonEnabled, a misplaced ifdef CAIRO in the 2.45.1 snapshot. The patch fixes the clients using webkit2-4.1 without turning on PSON However when process-swap-on-cross-site-navigation-enabled is turned on , the IPC communication bug I reported here is still present. webkit_web_page_send_message_to_view messages are not delivered at all from the "page-created" callback to the WebView. webkit_web_extension_send_message_to_context is delivered to the WebContext in the UI process but the WeBPage page_id is not yet initialized, and there is no reliable way to assciate the WebProcess with the WebPage on the page-created signal. Any insights (into what I may be missing) or advice welcome 2062306 8 ews-feeder 2024-09-23 06:00:18 -0700 No reviewer information in commit message, blocking PR #None. Details: [Build #1804](https://ews-build.webkit.org/#/builders/27/builds/1804) 2062308 9 472637 mcatanzaro 2024-09-23 06:11:44 -0700 Comment on attachment 472637 fix unconditional pson on 4.1 api Thanks. You'll need to fix the commit message format. An application that expects PSON will presumably not use these APIs in the same way surf is doing. 2062309 10 mcatanzaro 2024-09-23 06:13:05 -0700 Proper commit message format is: REGRESSION(275829@main): Communication with web processes broken in surf browser https://bugs.webkit.org/show_bug.cgi?id=278016 Reviewed by NOBODY (OOPS!) do not turn on pson unconditionally on 4.1 api when using skia * Source/WebKit/UIProcess/API/glib/WebKitWebContext.cpp: (webkitWebContextConstructed): PSON was getting turned on unconditionally in non-cairo builds. 2062349 11 472644 mcatanzaro 2024-09-23 09:37:55 -0700 Created attachment 472644 Patch attempt #2 Here's the same patch with a different commit message. Let's see if this works. 2062362 12 ews-feeder 2024-09-23 10:30:39 -0700 Committed 284088@main (911966a71e7c): <https://commits.webkit.org/284088@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 472644. 2062417 13 aperez 2024-09-23 12:56:31 -0700 The patch is now backported into the 2.46 branch in this commit: https://commits.webkit.org/282416.127@webkitglib/2.46 472131 2024-08-13 02:36:07 -0700 2024-08-13 02:36:07 -0700 log for 2.46.5 with webext-surf 2.46.5-log-checked.out text/plain 2716 enometh Mi40NS42LWxvZyAtIGNsZWFuZWQgKHJlbW92ZWQgVU5JTVBMRU1FTlRFRCwgVW5rbm93biBsb2dn aW5nLCBldGMuKQooUHJvY2Vzc1N3YXBwaW5nKSBSZW1vdmluZyBwcm9jZXNzIHdpdGggcGlkIDAg ZnJvbSB0aGUgb3JpZ2luIGNhY2hlIHNldAppbml0d2ViZXh0ZW5zaW9uczogVXNpbmcgV0VCS0lU X0VYVF9ESVI9L2Rldi9zaG0vc3VyZgppbml0d2ViZXh0ZW5zaW9uczogIC9kZXYvc2htL3N1cmYK RVJST1I6IEZhaWxlZCB0byBjb25uZWN0IHRvIFJlYWx0aW1lS2l0OiBDb3VsZCBub3QgY29ubmVj dDogTm8gc3VjaCBmaWxlIG9yIGRpcmVjdG9yeQouLi9Tb3VyY2UvV1RGL3d0Zi9saW51eC9SZWFs VGltZVRocmVhZHMuY3BwKDE5MikgOiB2b2lkIFdURjo6UmVhbFRpbWVUaHJlYWRzOjpyZWFsVGlt ZUtpdE1ha2VUaHJlYWRSZWFsVGltZSh1aW50NjRfdCwgdWludDY0X3QsIHVpbnQzMl90KQoKKiog 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09:38:10 -0700 fix unconditional pson on 4.1 api file_278016.txt text/plain 1455 enometh RnJvbSA1MjAxNmQ0YTEyYmQ1NTlmZjJhMjI4MWRlOTgwZGNjMjRhNTQ5MTcyIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQ0KRnJvbTogTWFkaHUgPGVub21ldGhAbmV0Lm1lZXI+DQpEYXRlOiBTdW4s IDIyIFNlcCAyMDI0IDIyOjMxOjE3ICswNTMwDQpTdWJqZWN0OiBbUEFUQ0hdIGRvIG5vdCB0dXJu IG9uIHBzb24gdW5jb25kaXRpb25hbGx5IG9uIDQuMSBhcGkgd2hlbiB1c2luZw0KIHNraWENCg0K KiBTb3VyY2UvV2ViS2l0L1VJUHJvY2Vzcy9BUEkvZ2xpYi9XZWJLaXRXZWJDb250ZXh0LmNwcDoN Cih3ZWJraXRXZWJDb250ZXh0Q29uc3RydWN0ZWQpOiBQU09OIHdhcyBnZXR0aW5nIHR1cm5lZCBv bg0KdW5jb25kaXRpb25hbGx5IGluIG5vbi1jYWlybyBidWlsZHMuDQotLS0NCiBTb3VyY2UvV2Vi S2l0L1VJUHJvY2Vzcy9BUEkvZ2xpYi9XZWJLaXRXZWJDb250ZXh0LmNwcCB8IDQgKysrLQ0KIDEg ZmlsZSBjaGFuZ2VkLCAzIGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkNCg0KZGlmZiAtLWdp dCBhL1NvdXJjZS9XZWJLaXQvVUlQcm9jZXNzL0FQSS9nbGliL1dlYktpdFdlYkNvbnRleHQuY3Bw IGIvU291cmNlL1dlYktpdC9VSVByb2Nlc3MvQVBJL2dsaWIvV2ViS2l0V2ViQ29udGV4dC5jcHAN 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