Touching compile.ekam-rule crashes Ekam about ekam

[jyn514]

It looks like this only happens if you touch it after ekam has finished building all pending tasks - if you touch it while it's still compiling, it will correctly rebuild the whole source tree instead.

✔ test: kj/string-tree-test
↺ compile: kj/compat/http-test.c++
  compile: kj/filesystem-disk-test.c++
↺ compile: kj/compat/http-test.c++
↺ compile: kj/compat/http-test.c++
↺ learn: ekam/rules/compile.ekam-rule
  learn: ekam/rules/compile.ekam-rule
↺ compile: ekam/rules/intercept.c
↺ compile: capnp/reconnect.c++
↺ compile: capnp/afl-testcase.c++
↺ compile: capnp/test-util.c++
↺ compile: capnp/capability.c++
↺ compile: capnp/blob-test.c++
↺ compile: capnp/message-test.c++
↺ compile: capnp/serialize-packed-test.c++

[jyn514]

Here's a backtrace:

ekam: /ekam-provider/canonical/ekam/Driver.cpp:404: void ekam::Driver::ActionDriver::reset(): Assertion `!currentlyExecutingReturned' failed.

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) where
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7a77859 in __GI_abort () at abort.c:79
#2  0x00007ffff7a77729 in __assert_fail_base (
    fmt=0x7ffff7c0d588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", 
    assertion=0x4bd9b8 "!currentlyExecutingReturned", 
    file=0x4bd9d4 "/ekam-provider/canonical/ekam/Driver.cpp", line=404, 
    function=<optimized out>) at assert.c:92
#3  0x00007ffff7a88f36 in __GI___assert_fail (
    assertion=0x4bd9b8 "!currentlyExecutingReturned", 
    file=0x4bd9d4 "/ekam-provider/canonical/ekam/Driver.cpp", line=404, 
    function=0x4bdb96 "void ekam::Driver::ActionDriver::reset()") at assert.c:101
#4  0x0000000000478df3 in ekam::Driver::ActionDriver::reset (this=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:404
#5  0x0000000000479034 in ekam::Driver::resetDependentActions (this=<optimized out>, 
    this@entry=0x7fffffffdc88, provision=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:750
#6  0x0000000000478b8d in ekam::Driver::ActionDriver::reset (this=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:445
#7  0x0000000000479034 in ekam::Driver::resetDependentActions (this=<optimized out>, 
    this@entry=0x7fffffffdc88, provision=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:750
#8  0x0000000000478b8d in ekam::Driver::ActionDriver::reset (this=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:445
#9  0x0000000000478f1f in ekam::Driver::resetDependentActions (
    this=this@entry=0x7fffffffdc88, provision=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:730
#10 0x0000000000478b8d in ekam::Driver::ActionDriver::reset (this=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:445
#11 0x0000000000479034 in ekam::Driver::resetDependentActions (this=<optimized out>, 
    this@entry=0x7fffffffdc88, provision=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:750
#12 0x0000000000478b8d in ekam::Driver::ActionDriver::reset (this=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:445
#13 0x0000000000478f1f in ekam::Driver::resetDependentActions (
    this=this@entry=0x7fffffffdc88, provision=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:730
#14 0x0000000000478b8d in ekam::Driver::ActionDriver::reset (this=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:445
#15 0x0000000000478c98 in ekam::Driver::ActionDriver::reset (this=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:460
#16 0x0000000000479034 in ekam::Driver::resetDependentActions (this=<optimized out>, 
    this@entry=0x7fffffffdc88, provision=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:750
#17 0x0000000000478b8d in ekam::Driver::ActionDriver::reset (this=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:445
#18 0x0000000000479034 in ekam::Driver::resetDependentActions (this=<optimized out>, 
--Type <RET> for more, q to quit, c to continue without paging--
    this@entry=0x7fffffffdc88, provision=<optimized out>)
    at /ekam-provider/canonical/ekam/Driver.cpp:750
#19 0x0000000000479430 in ekam::Driver::addSourceFile (this=0x7fffffffdc88, 
    file=<optimized out>) at /ekam-provider/canonical/ekam/Driver.cpp:572
#20 0x000000000042444d in ekam::FileWatcher::modified (this=<optimized out>)
    at /ekam-provider/canonical/ekam/ekam.cpp:200
#21 0x00000000004231a6 in ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}::operator()(ekam::EventManager::FileChangeType) const (
    this=this@entry=0x7fffffffd9f0, changeType=(unknown: -13488))
    at /ekam-provider/canonical/ekam/ekam.cpp:157
#22 0x0000000000423130 in ekam::promiseInternal::CallAndFulfillFunctor<void>::operator()<ekam::PromiseFulfiller<void>::Callback, ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}, ekam::EventManager::FileChangeType>(ekam::WeakLink*, ekam::PromiseFulfiller<void>::Callback*, ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}&, ekam::EventManager::FileChangeType&&) const (this=this@entry=0x7fffffffd938, 
    linkToFulfiller=linkToFulfiller@entry=0x7fffffffd9e0, callback=callback@entry=0x5c9138, 
    func=..., params=<optimized out>) at /ekam-provider/c++header/base/Promise.h:610
#23 0x00000000004230fe in ekam::promiseInternal::DependentPromiseFulfiller<void, ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}, ekam::promiseInternal::ForceErrorFunctor<void>, ekam::ValuePack<ekam::Promise<ekam::EventManager::FileChangeType> > >::DoReadyFunctor::operator()<ekam::Promise>(ekam::WeakLink*, ekam::PromiseFulfiller<void>::Callback*, {lambda(ekam::EventManager::FileChangeType)#1}&, ekam::Promise&&) const (
    this=this@entry=0x7fffffffd9d0, linkToFulfiller=0x7fffffffcb50, 
    linkToFulfiller@entry=0x7fffffffd9e0, callback=0x0, callback@entry=0x5c9138, func=..., 
    params=...) at /ekam-provider/c++header/base/Promise.h:703
#24 0x0000000000423094 in ekam::ValuePack<>::applyMoving<ekam::promiseInternal::DependentPromiseFulfiller<void, ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}, ekam::promiseInternal::ForceErrorFunctor<void>, ekam::ValuePack<ekam::Promise<ekam::EventManager::FileChangeType> > >::DoReadyFunctor, ekam::WeakLink*, ekam::PromiseFulfiller<void>::Callback*&, {lambda(ekam::EventManager::FileChangeType)#1}&, ekam::Promise> (
    this=this@entry=0x7fffffffd9d8, func=..., params=..., params=..., params=..., 
    params=...) at /ekam-provider/c++header/base/Promise.h:89
#25 0x0000000000423035 in ekam::ValuePack<ekam::Promise<ekam::EventManager::FileChangeType> >::applyMoving<ekam::promiseInternal::DependentPromiseFulfiller<void, ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}, ekam::promiseInternal::ForceErrorFunctor<void>, ekam::ValuePack<ekam::Promise<ekam::EventManager::FileChangeType> > >::DoReadyFunctor, ekam::WeakLink*, ekam::PromiseFulfiller<void>::Callback*&, {lambda(ekam::EventManager::FileChangeType)#1}&> (this=this@entry=0x7fffffffd9d8, func=..., params=..., params=..., 
    params=...) at /ekam-provider/c++header/base/Promise.h:68
#26 0x0000000000422bd5 in ekam::promiseInternal::DependentPromiseFulfiller<void, ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}, ekam::promiseInternal::ForceErrorFunctor<void>, ekam::ValuePack<ekam::Promise<ekam::EventManager::FileChangeType> > >::ready() (this=this@entry=0x5c9140) at /ekam-provider/c++header/base/Promise.h:714
#27 0x0000000000422a7e in ekam::promiseInternal::DependentPromiseFulfiller<void, ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}, ekam::promiseInternal::ForceErrorFunctor<void>, ekam::ValuePack<ekam::Promise<ekam::EventManager::FileChangeType> > >::--Type <RET> for more, q to quit, c to continue without paging--c
readyLater()::{lambda()#1}::operator()() const (this=<optimized out>) at /ekam-provider/c++header/base/Promise.h:754
#28 0x0000000000422a4a in ekam::LambdaRunnable<ekam::promiseInternal::DependentPromiseFulfiller<void, ekam::Watcher::waitForEvent()::{lambda(ekam::EventManager::FileChangeType)#1}, ekam::promiseInternal::ForceErrorFunctor<void>, ekam::ValuePack<ekam::Promise<ekam::EventManager::FileChangeType> > >::readyLater()::{lambda()#1}>::run() (this=<optimized out>) at /ekam-provider/c++header/base/Promise.h:170
#29 0x000000000040be27 in ekam::EpollEventManager::AsyncCallbackHandler::run (this=this@entry=0x12ef990) at /ekam-provider/canonical/os/EpollEventManager.cpp:294
#30 0x000000000040b023 in ekam::EpollEventManager::handleEvent (this=this@entry=0x545fe0) at /ekam-provider/canonical/os/EpollEventManager.cpp:848
#31 0x000000000040afd8 in ekam::EpollEventManager::loop (this=0x545fe0) at /ekam-provider/canonical/os/EpollEventManager.cpp:839
#32 0x000000000041ed65 in ekam::main (argc=<optimized out>, argv=<optimized out>) at /ekam-provider/canonical/ekam/ekam.cpp:573
#33 0x000000000041f266 in main (argc=2, argv=0x7fffffffcb50) at /ekam-provider/canonical/ekam/ekam.cpp:605

For some reason this only happens when capnp is in the sources somewhere, if it's only kj then it works fine.