187485 2018-07-09 14:49:35 -0700 JavaScriptCore doesn't work with musl-libc 2021-05-25 15:29:19 -0700 1 1 1 Unclassified WebKit JavaScriptCore Other PC Linux RESOLVED DUPLICATE 210068 https://bugs.webkit.org/show_bug.cgi?id=210068 P2 Major --- 208223 210068 225099 1 beb5pft5lz webkit-unassigned aperez bugs-noreply clopez contact+bugs.webkit.org h4yfx4vuvg mark.lam pwr ysuzuki oldest_to_newest 1440563 0 beb5pft5lz 2018-07-09 14:49:35 -0700 Hello there, I wanted to run luakit (a javascript based webbrowser) on Alpine Linux (uses musl libc) and noticed that it wasn't able to evaluate any javascript. After some research I found the following issue in the luakit bugtracker: * https://github.com/luakit/luakit/issues/550 According to this GitHub issue in the luakit bug tracker this isn't a problem with luakit but instead a problem with webkit itself (or more specific JavaScriptCore). I did some further research and found additional entries in bug trackers of musl-based linux distributions also claiming that this is a bug in webkit: * https://github.com/voidlinux/void-packages/issues/5360 * https://bugs.alpinelinux.org/issues/8492 Most of these bug reports claim that this might be related to the default stack size for new threads in musl. Which is a lot smaller than the default stack size in glibc (see: https://wiki.musl-libc.org/functional-differences-from-glibc.html#Thread-stack-size) To make sure that this is really a bug in webkit I came up with a little C example evaluating a simple javascript expression using JavaScriptCore. This C program is attached it is mostly based on a code snippet from `Source/JavaScriptCore/API/tests/testapi` (thus I assume that it should work). I compiled the attached code snippet with `gcc -o test test.c $(pkg-config --cflags webkit2gtk-4.0) $(pkg-config --libs webkit2gtk-4.0)` on Alpine Linux Edge (x86_64) using webkit 2.20.3. Invoking the resulting binary produces the following output: `test: JSEvaluateScript failed`. I also invoked the binary with valgrind (the output can be found here https://paste42.de/13254/) which makes me believe that this is really an issue regarding the thread stack size since various attempts are made to access memory below the stack pointer. Besides the test program segfaults when started with valgrind which is also strange. I (and the people who created the bugs linked above) would be very happy if this could be investigated further and (hopefully) be fixed soon. I would also suggest that you run your test suite on a musl-based system as well to prevent these kind of issues in the future. 1440564 1 344619 beb5pft5lz 2018-07-09 14:50:29 -0700 Created attachment 344619 Minimal test program to reproduce the issue 1440565 2 344620 beb5pft5lz 2018-07-09 14:51:13 -0700 Created attachment 344620 Valgrind output for the test program 1440989 3 ysuzuki 2018-07-10 15:15:46 -0700 Yeah, this is because musl's stack size is very small[1]. So, all the stack overflow checks fail since soft stack limit is smaller than the current stack pointer. We can make JSC work by changing MinimumReservedZoneSize.h from `static const unsigned minimumReservedZoneSize = 16 * KB;` to `static const unsigned minimumReservedZoneSize = 4 * KB;` or smaller value (At least in my Linux box using glibc, with `ulimit -s 80`). But it seems dangerous to me. Personally, I think increasing the default stack size of musl is the right way to fix. When setting `ulimit -s 100` in my Linux box (using glibc), even gdb fails to start. The difficult thing is that we cannot deploy this tweak for musl, since musl does not provide any macro / definition to detect musl intentionally[1], while musl's behavior is different from glibc (actually stack size is small) :(. Mark, what do you think of? [1]: https://wiki.musl-libc.org/functional-differences-from-glibc.html#Thread-stack-size [2]: https://wiki.musl-libc.org/faq.html#Q:-Why-is-there-no-%3Ccode%3E__MUSL__%3C/code%3E-macro? 1491134 4 h4yfx4vuvg 2019-01-02 03:48:23 -0800 Unfourtunatly, simply increasing the stack size is not enough. The following patch is currently used by Alpine Linux and Void Linux for their webkit2gtk package: https://git.alpinelinux.org/cgit/aports/tree/community/webkit2gtk/musl-fixes.patch?id=609fbb0235cf6440f5d502885c4e0531c835aed7 1619417 5 contact+bugs.webkit.org 2020-02-15 07:40:49 -0800 One way which seems less hacky/faulty than the alpine patch there would be to use pthread_attr_setstacksize like musl suggests (and no #ifdef should be required as it is POSIX) and/or "increasing the default stack size via the PT_GNU_STACK program header, which can be set at link time via -Wl,-z,stack-size=N". I don't have much compiling power on my musl machine now (~2012 laptop with intel vulns, will replace it) but I'll try the latter. 1623155 6 aperez 2020-02-26 13:40:10 -0800 (In reply to Haelwenn (lanodan) Monnier from comment #5) > One way which seems less hacky/faulty than the alpine patch there would be > to use pthread_attr_setstacksize like musl suggests (and no #ifdef should be > required as it is POSIX) and/or "increasing the default stack size via the > PT_GNU_STACK program header, which can be set at link time via > -Wl,-z,stack-size=N". > > I don't have much compiling power on my musl machine now (~2012 laptop with > intel vulns, will replace it) but I'll try the latter. The patch in bug #208223 adds configuring stack sizes, so once that lands maybe the only leftover thing to do in this regard is to detect if Musl is being used (tricky, maybe it's better to check for “not glibc”) and set some sane value for DEFAULT_THREAD_STACK_SIZE_IN_KB. 1696785 7 pwr 2020-10-11 20:57:08 -0700 Thank you guys for looking into this :) I'd very much like to use a WebKit browser on a musl system (Alpine Linux). (In reply to Adrian Perez from comment #6) > The patch in bug #208223 adds configuring stack sizes, so once that > lands maybe the only leftover thing to do in this regard is to detect > if Musl is being used (tricky, maybe it's better to check for “not > glibc”) and set some sane value for DEFAULT_THREAD_STACK_SIZE_IN_KB. Now that bug 208223 is resolved, is detecting mucl the only thing left to do? For what my razor-thin understanding is worth, musl is a strict C library compared to the GNU C library with its own additions? If this is the case, could the condition case not be reversed, i.e. if GNU C additions are available, target those, otherwise, target strict C? 1763704 8 aperez 2021-05-25 15:28:09 -0700 JSC is working fine after the patch for bug #210068 landed, so let's close this :) *** This bug has been marked as a duplicate of bug 210068 *** 344619 2018-07-09 14:50:29 -0700 2018-07-09 14:50:29 -0700 Minimal test program to reproduce the issue test.c text/plain 489 beb5pft5lz I2luY2x1ZGUgPGVyci5oPgojaW5jbHVkZSA8c3RkbGliLmg+CiNpbmNsdWRlIDxKYXZhU2NyaXB0 Q29yZS9KYXZhU2NyaXB0Lmg+CgpzdGF0aWMgSlNHbG9iYWxDb250ZXh0UmVmIGNvbnRleHQ7Cgpp bnQKbWFpbih2b2lkKQp7CglKU1N0cmluZ1JlZiBzY3JpcHQ7CglKU1ZhbHVlUmVmIHJlc3VsdCwg ZXhjZXB0aW9uID0gTlVMTDsKCgljb250ZXh0ID0gSlNHbG9iYWxDb250ZXh0Q3JlYXRlSW5Hcm91 cChOVUxMLCBOVUxMKTsKCglzY3JpcHQgPSBKU1N0cmluZ0NyZWF0ZVdpdGhVVEY4Q1N0cmluZygi WyBdIik7CglyZXN1bHQgPSBKU0V2YWx1YXRlU2NyaXB0KGNvbnRleHQsIHNjcmlwdCwgTlVMTCwg 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