237398 2022-03-02 16:18:28 -0800 [macOS] WebContent processes crash with XPC_EXIT_REASON_SIGTERM_TIMEOUT when logging out 2022-03-10 16:29:20 -0800 1 1 1 Unclassified WebKit WebKit2 WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 cdumez cdumez achristensen ap darin ggaren kkinnunen sam webkit-bug-importer oldest_to_newest 1847666 0 cdumez 2022-03-02 16:18:28 -0800 WebContent processes crash with XPC_EXIT_REASON_SIGTERM_TIMEOUT when logging out of macOS. 1847667 1 cdumez 2022-03-02 16:18:39 -0800 <rdar://88940229> 1847669 2 453674 cdumez 2022-03-02 16:23:58 -0800 Created attachment 453674 Patch 1847720 3 453674 ap 2022-03-02 19:05:16 -0800 Comment on attachment 453674 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=453674&action=review > Source/WebKit/Shared/EntryPointUtilities/Cocoa/XPCService/XPCServiceEntryPoint.mm:178 > + exit(0); Is it safe to call exit from a signal handler? atexit functions could do arbitrary work, so I’d be looking at _exit(). 1847728 4 cdumez 2022-03-02 20:18:05 -0800 (In reply to Alexey Proskuryakov from comment #3) > Comment on attachment 453674 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=453674&action=review > > > Source/WebKit/Shared/EntryPointUtilities/Cocoa/XPCService/XPCServiceEntryPoint.mm:178 > > + exit(0); > > Is it safe to call exit from a signal handler? atexit functions could do > arbitrary work, so I’d be looking at _exit(). Well, we do want those atexit handlers to run though I think. It minimizes the odds of losing cookies and storage data. What is the concern exactly? That the atexit handlers take too long and we reach the timeout and still get killed? Even if that’s the case, I would think it is preferable to at least try and run those handlers. Would be sad to lose some cookies or local storage data when logging out. 1847972 5 ap 2022-03-03 10:35:23 -0800 My concern is that atexit handlers will be using functions that are unsafe in signal handler context (which is extremely restrictive), so we'll be getting memory corruption, hangs and such. If we need to run these even after receiving SIGTERM, we need to ignore the signal, and to initiate a clean exit from run loop somehow (I don't know how exactly to do that from signal handler context). 1848005 6 cdumez 2022-03-03 11:34:33 -0800 (In reply to Alexey Proskuryakov from comment #5) > My concern is that atexit handlers will be using functions that are unsafe > in signal handler context (which is extremely restrictive), so we'll be > getting memory corruption, hangs and such. > > If we need to run these even after receiving SIGTERM, we need to ignore the > signal, and to initiate a clean exit from run loop somehow (I don't know how > exactly to do that from signal handler context). I may be able to do the following in my signal handler: 1. Clear the OS transaction 2. Reset to the default signal handler 3. raise() the signal again I need to validate this to make sure it actually works in practice though. 1848014 7 453770 cdumez 2022-03-03 11:48:36 -0800 Created attachment 453770 Patch 1848015 8 cdumez 2022-03-03 11:49:37 -0800 (In reply to Chris Dumez from comment #6) > (In reply to Alexey Proskuryakov from comment #5) > > My concern is that atexit handlers will be using functions that are unsafe > > in signal handler context (which is extremely restrictive), so we'll be > > getting memory corruption, hangs and such. > > > > If we need to run these even after receiving SIGTERM, we need to ignore the > > signal, and to initiate a clean exit from run loop somehow (I don't know how > > exactly to do that from signal handler context). > > I may be able to do the following in my signal handler: > 1. Clear the OS transaction > 2. Reset to the default signal handler > 3. raise() the signal again > > I need to validate this to make sure it actually works in practice though. Ok, I implemented this alternative proposal that should be less controversial I hope. I tested it manually and it seems to work just as well. 1848021 9 453770 darin 2022-03-03 12:01:15 -0800 Comment on attachment 453770 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=453770&action=review > Source/WebKit/Shared/EntryPointUtilities/Cocoa/XPCService/XPCServiceEntryPoint.mm:180 > + signal(SIGTERM, [](int) { > + globalTransaction.get() = nullptr; > + signal(SIGTERM, SIG_DFL); > + raise(SIGTERM); > + }); This looks great. Really glad Alexey pointed out it was not OK to call exit. I tried to do some more research on "cleanup and re-raise signal" and see if it’s more elegantly done with sigaction instead of signal, but the examples I found are all like what you wrote here. 1848030 10 ap 2022-03-03 12:13:24 -0800 Looks good to me too. I'm far from being an expert on writing code that works in signal handlers, but I couldn't find anything against this approach with a few web searches. 1848032 11 cdumez 2022-03-03 12:14:27 -0800 (In reply to Alexey Proskuryakov from comment #10) > Looks good to me too. I'm far from being an expert on writing code that > works in signal handlers, but I couldn't find anything against this approach > with a few web searches. Ok, thanks for pointing out the issue in the original proposal. TIL :) 1848072 12 ews-feeder 2022-03-03 14:40:02 -0800 Committed r290795 (248035@main): <https://commits.webkit.org/248035@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 453770. 1850102 13 cdumez 2022-03-10 08:01:22 -0800 Reverted r290795 for reason: Caused crashes <rdar://problem/89970722> Committed r291110 (248272@trunk): <https://commits.webkit.org/248272@trunk> 1850104 14 454364 cdumez 2022-03-10 08:08:07 -0800 Created attachment 454364 Patch 1850105 15 454364 cdumez 2022-03-10 08:17:15 -0800 Comment on attachment 454364 Patch Turns out I cannot even release the OS transaction in the signal handler. As a result, I am going back to Alexey's original proposal to call _exit(0). Eventually we should just stop leaking this transaction (and adopt RunningBoard) but this is quite a bit of work and not risk free. 1850250 16 454364 ap 2022-03-10 14:42:09 -0800 Comment on attachment 454364 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=454364&action=review > Source/WebKit/ChangeLog:14 > + To address the issue, we now set our own SIGTERM handler that releases the OS transaction and calls _exit(0) Please update the ChangeLog for updated patch. 1850252 17 454403 cdumez 2022-03-10 14:47:42 -0800 Created attachment 454403 Patch for landing 1850308 18 ews-feeder 2022-03-10 16:29:14 -0800 Committed r291137 (248297@main): <https://commits.webkit.org/248297@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 454403. 453674 2022-03-02 16:23:58 -0800 2022-03-03 11:48:34 -0800 Patch bug-237398-20220302162357.patch text/plain 5353 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMjkwNzU5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IGRkYzUyMmJmYzg1MDcyYThj OWYzMzVjMzQ1ZDI5MzhiZWIxNDljYTguLjM1ZWQxZTk5MDkxMjI5MDlmN2RlZjlkNTExZmMzNWU5 OGRkMDk4MmYgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMjcgQEAKKzIwMjItMDMtMDIgIENocmlzIER1 bWV6ICA8Y2R1bWV6QGFwcGxlLmNvbT4KKworICAgICAgICBbbWFjT1NdIFdlYkNvbnRlbnQgcHJv Y2Vzc2VzIGNyYXNoIHdpdGggWFBDX0VYSVRfUkVBU09OX1NJR1RFUk1fVElNRU9VVCB3aGVuIGxv Z2dpbmcgb3V0CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9p ZD0yMzczOTgKKyAgICAgICAgPHJkYXI6Ly84ODk0MDIyOT4KKworICAgICAgICBSZXZpZXdlZCBi eSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBCZWNhdXNlIHdlIGRvbid0IHVzZSBSdW5uaW5n 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