220641 2021-01-14 16:44:21 -0800 Add JSC API configuring GC signals in Linux 2021-03-17 02:51:10 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Linux RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=223069 InRadar P2 Normal --- 221081 1 gjp ysuzuki benjamin cdumez cmarcelo ews-watchlist keith_miller mark.lam msaboff saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1719748 0 gjp 2021-01-14 16:44:21 -0800 JSC uses SIGUSR1 to suspend/resume threads on Linux. However, this signal handler can segfault if a process using JSC receives a SIGUSR1 at a very particular time: after JSC initialization (i.e. when the signal handler is installed), but before the first time that JSC actually does a Thread suspend. I believe (from stack traces) that this is coming from this line: https://trac.webkit.org/browser/webkit/trunk/Source/WTF/wtf/posix/ThreadingPOSIX.cpp?rev=270806#L121 Specifically, the `targetThread` global is still nullptr in this situation. Perhaps a null check will suffice as a fix? 1719926 1 ysuzuki 2021-01-15 11:00:29 -0800 This is a nice catch! 1719927 2 ysuzuki 2021-01-15 11:04:53 -0800 I think JSC is not considering about the pattern emitting SIGUSR1 without interacting with JSC code, but just adding nullptr check is free, and if it can fix some usage, let's just add it. 1719930 3 ysuzuki 2021-01-15 11:28:46 -0800 (In reply to George Pittarelli from comment #0) > JSC uses SIGUSR1 to suspend/resume threads on Linux. However, this signal > handler can segfault if a process using JSC receives a SIGUSR1 at a very > particular time: after JSC initialization (i.e. when the signal handler is > installed), but before the first time that JSC actually does a Thread > suspend. > > I believe (from stack traces) that this is coming from this line: > https://trac.webkit.org/browser/webkit/trunk/Source/WTF/wtf/posix/ > ThreadingPOSIX.cpp?rev=270806#L121 > > Specifically, the `targetThread` global is still nullptr in this situation. > Perhaps a null check will suffice as a fix? I looked into it deeply, and I have some thoughts. Can you share your story about why emitting SIGUSR1? To handle your use case better, we need know how you are using SIGUSR1. In JSC on Linux, JSC is not assuming SIGUSR1 is emitted outside of JSC. JSC strongly assumes that targetThread is filled with argument thread before the signal is invoked, and this invariant is kept in JSC code. So, JSC will never see nullptr in targetThread without emitting SIGUSR1 outside of JSC. Even though we insert null check against targetThread, it is still possible that, 1. targetThread is filled with already-freed Thread pointer (since JSC does not clear it after using, and it is still possible) 2. Conflict with JSC's suspension mechanism (like, sending this signal while JSC is about to sending this signal to suspend). Several ways can be considered. 1. If you are using Linux, and if you are not using pthread_sigqueue to emit SIGUSR1, then JSC can switch to use pthread_sigqueue to emit signal in Linux, and check `if (info->si_code == SI_QUEUE)` to make signal sender narrower. 2. If you are sending a signal outside of the process using JSC, JSC can use si_pid to check wether the signal is sent by own process, and exclude handling. 1720051 4 gjp 2021-01-15 15:10:26 -0800 Hi Yusuke, thank you for the investigation! > Can you share your story about why emitting SIGUSR1? > To handle your use case better, we need know how you are using SIGUSR1. We have a binary that uses JSC, among other libraries. One of those other libraries also sets a SIGUSR1 handler, but that handler is effectively a no-op when triggered unintentionally. That handler is triggered from another process at arbitrary times. (Yes, there's a performance question here of JSC's SIGUSR1 triggering that other handler repeatedly, but we're addressing that separately.) > 1. If you are using Linux, and if you are not using pthread_sigqueue to emit SIGUSR1, then JSC can switch to use pthread_sigqueue to emit signal in Linux, and check `if (info->si_code == SI_QUEUE)` to make signal sender narrower. > 2. If you are sending a signal outside of the process using JSC, JSC can use si_pid to check wether the signal is sent by own process, and exclude handling. Option 2 would solve our particular use case. I worry about the other case: in general, what if someone tries to use JSC alongside another library that uses SIGUSR1 in the same way that JSC does? That said, I also don't see a 100% perfect fix. Is there any reason not to do both options? And if sigqueue is used, perhaps you could narrow even further with si_value? 1720062 5 ysuzuki 2021-01-15 15:50:01 -0800 (In reply to George Pittarelli from comment #4) > Hi Yusuke, thank you for the investigation! > > > Can you share your story about why emitting SIGUSR1? > > To handle your use case better, we need know how you are using SIGUSR1. > > We have a binary that uses JSC, among other libraries. One of those other > libraries also sets a SIGUSR1 handler, but that handler is effectively a > no-op when triggered unintentionally. That handler is triggered from another > process at arbitrary times. (Yes, there's a performance question here of > JSC's SIGUSR1 triggering that other handler repeatedly, but we're addressing > that separately.) > > > 1. If you are using Linux, and if you are not using pthread_sigqueue to emit SIGUSR1, then JSC can switch to use pthread_sigqueue to emit signal in Linux, and check `if (info->si_code == SI_QUEUE)` to make signal sender narrower. > > 2. If you are sending a signal outside of the process using JSC, JSC can use si_pid to check wether the signal is sent by own process, and exclude handling. > > Option 2 would solve our particular use case. > > I worry about the other case: in general, what if someone tries to use JSC > alongside another library that uses SIGUSR1 in the same way that JSC does? > That said, I also don't see a 100% perfect fix. Is there any reason not to > do both options? And if sigqueue is used, perhaps you could narrow even > further with si_value? Unfortunately, in Linux, signaling is the most reliable way to suspend and resume the thread, and it is used in many concurrent GCes. So, I think no perfect solution exists unfortunately. JSC uses suspend and resume mechanism to drive concurrent GC. So, at least one signal is required in Linux and BSD (IIRC, BSD has a way to suspend and resume threads, but they do not have a way to extract machine context of the suspended threads. Darwin and Windows have a way to suspend and resume threads, plus, extracting machine context of suspended threads). Currently, we are using SIGUSR1. Possibly, we could offer a way to configure what signal will be used. Or we can pick a signal that is more extremely rarely used one instead. For example, in Linux, realtime signals can be used for application purpose but they are not typically used in application. Maybe, picking one of realtime signal would be better for application compatibility. What do you think of? 1720063 6 ysuzuki 2021-01-15 15:55:14 -0800 Yeah, possibly, using one of real-time signal would be better for Linux. Since real-time signals are not hardcoded, good application can search to find an appropriate signal for their purpose. So, JSC can also find one of real-time signal and use it. 1720105 7 ysuzuki 2021-01-15 18:56:56 -0800 (In reply to Yusuke Suzuki from comment #6) > Yeah, possibly, using one of real-time signal would be better for Linux. > Since real-time signals are not hardcoded, good application can search to > find an appropriate signal for their purpose. So, JSC can also find one of > real-time signal and use it. Ah, unfortunately, no. real-time signals are always queued even if we do not use pthread_sigqueue. It is not queued if we use `kill`, but (I think this is not great) if we use pthread_kill, then this is queued. And queue size is limited, so we could have a fun issue. I think we should try using SIGPWR or SIGXCPU. https://superuser.com/questions/1185603/what-can-trigger-a-sigpwr-signal-that-interrupts-a-sendmsg-system-call 1720110 8 ysuzuki 2021-01-15 19:52:50 -0800 Any signals can potentially conflict. So let's just use SIGUSR1 for now, and putting a function that allows embedders can change. 1720111 9 ysuzuki 2021-01-15 19:53:10 -0800 Since there is no way in Linux, I think this is the best path. 1720116 10 417759 ysuzuki 2021-01-15 20:56:17 -0800 Created attachment 417759 Patch 1720117 11 417760 ysuzuki 2021-01-15 21:10:27 -0800 Created attachment 417760 Patch 1720149 12 417760 mark.lam 2021-01-16 15:18:38 -0800 Comment on attachment 417760 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=417760&action=review r=me with suggested improvement. > Source/WTF/wtf/posix/ThreadingPOSIX.cpp:80 > +int sigThreadSuspendResume { -1 }; > +bool sigThreadSuspendResumeIsFrozen { false }; Why not store these as fields in WTFConfig where they can actually get frozen? 1720162 13 417760 ysuzuki 2021-01-16 22:49:39 -0800 Comment on attachment 417760 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=417760&action=review >> Source/WTF/wtf/posix/ThreadingPOSIX.cpp:80 >> +bool sigThreadSuspendResumeIsFrozen { false }; > > Why not store these as fields in WTFConfig where they can actually get frozen? It makes initialization code a bit complicated (we need to insert WTF::initialize() in TLS initialization) and we need another two flags because WTFConfig cannot initialize field with -1, but changed. 1720163 14 417775 ysuzuki 2021-01-16 22:51:28 -0800 Created attachment 417775 Patch 1720164 15 417776 ysuzuki 2021-01-16 22:56:08 -0800 Created attachment 417776 Patch 1720166 16 ysuzuki 2021-01-17 00:50:55 -0800 Committed r271560: <https://trac.webkit.org/changeset/271560> 1720167 17 webkit-bug-importer 2021-01-17 00:51:13 -0800 <rdar://problem/73292189> 1720168 18 ysuzuki 2021-01-17 00:59:29 -0800 @George Added `JSConfigureSignalForGC` SPI (not an API yet), so for now, you can use it by including `JSBasePrivate.h`. We could promote it to API later. By default, JSC uses SIGUSR1. And embedder can select different signal if an embedder is using it e.g. SIGPWR, SIGXCPU etc. (for example, dotnet (mono), BoehmGC uses SIGPWR / SIGXCPU. Hotspot VM uses SIGUSR2.) Call this function before initializing any part of JSC. After JSC initialization, JSConfigureSignalForGC fails (returning false). 1720169 19 ysuzuki 2021-01-17 01:23:28 -0800 (In reply to Yusuke Suzuki from comment #18) > @George > > Added `JSConfigureSignalForGC` SPI (not an API yet), so for now, you can use > it by including `JSBasePrivate.h`. We could promote it to API later. > By default, JSC uses SIGUSR1. And embedder can select different signal if an > embedder is using it e.g. SIGPWR, SIGXCPU etc. (for example, dotnet (mono), > BoehmGC uses SIGPWR / SIGXCPU. Hotspot VM uses SIGUSR2.) > Call this function before initializing any part of JSC. After JSC > initialization, JSConfigureSignalForGC fails (returning false). Maybe, we also add environment variable thing too later. 417759 2021-01-15 20:56:17 -0800 2021-01-15 21:11:57 -0800 Patch bug-220641-20210115205616.patch text/plain 11464 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjcxNTQ0CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBk NmU2NTA2NTkyOTkyYmJjNTVkZmIwMWQyNDVmYTdlMmE2Mzk5NTk3Li43MDdhNmNmMmZiNGE4OTI0 MjIzZDZjMjQ4MGM3NjQ5OTIwYWZlMDIwIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxNiBAQAorMjAyMS0wMS0xNSAgWXVzdWtlIFN1enVraSAgPHlzdXp1a2lAYXBwbGUuY29t PgorCisgICAgICAgIEFkZCBKU0MgQVBJIGNvbmZpZ3VyaW5nIEdDIHNpZ25hbHMgaW4gTGludXgK KyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIyMDY0MQor CisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEFkZCBKU0Nv bmZpZ3VyZVNpZ25hbEZvckdDIGZ1bmN0aW9uIGZvciBMaW51eCBhbmQgRnJlZUJTRCAobm9uIEFw 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