Open
Description
Both ci.swift.org's Fedora 39 and my Fedora 40 systems are experiencing the same issue with lldb's TestSwiftConsumeOperatorAsync.py. The test fails with the following error message:
Details
FAIL: test_swift_consume_operator_async_dwarf (TestSwiftConsumeOperatorAsync.TestSwiftConsumeOperatorAsyncType)
Check that we properly show variables at various points of the CFG while
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/build-user/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1692, in test_method
return attrvalue(self)
^^^^^^^^^^^^^^^
File "/home/build-user/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 169, in wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File "/home/build-user/llvm-project/lldb/test/API/lang/swift/variables/consume_operator_async/TestSwiftConsumeOperatorAsync.py", line 45, in test_swift_consume_operator_async
self.do_check_copyable_value_test()
File "/home/build-user/llvm-project/lldb/test/API/lang/swift/variables/consume_operator_async/TestSwiftConsumeOperatorAsync.py", line 75, in do_check_copyable_value_test
self.assertGreater(varK.unsigned, 0, "varK not initialized?!")
AssertionError: 0 not greater than 0 : varK not initialized?!
Config=x86_64-/home/build-user/build/buildbot_linux/llvm-linux-x86_64/bin/clang
Relevant CI job: https://ci.swift.org/job/oss-swift-package-fedora-39/165
I manually built the test code and ran it with lldb. The results seem different from what is expected in llvm-project/lldb/test/API/lang/swift/variables/consume_operator_async/TestSwiftConsumeOperatorAsync.py.
Details
$ /path/to/build/usr/bin/lldb ./a.out
(lldb) target create "./a.out"
Current executable set to '/path/to//swift/a.out' (x86_64).
(lldb) b main.swift:24
Breakpoint 1: where = a.out`copyableValueTest() + 48 at main.swift:24:11, address = 0x0000000000001530
(lldb) b main.swift:27
Breakpoint 2: 3 locations.
(lldb) b main.swift:28
Breakpoint 3: where = a.out`copyableValueTest() + 63 at main.swift:28:11, address = 0x00000000000016ef
(lldb) b main.swift:30
Breakpoint 4: where = a.out`copyableValueTest() + 217 at main.swift:30:7, address = 0x0000000000001789
(lldb) b main.swift:32
Breakpoint 5: where = a.out`copyableValueTest() + 46 at main.swift:32:7, address = 0x000000000000185e
(lldb) c
error: Command requires a current process.
(lldb) r
Process 2644725 launched: '/path/to//swift/a.out' (x86_64)
warning: (x86_64) /lib64/libstdc++.so.6 No LZMA support found for reading .gnu_debugdata section
warning: (x86_64) /lib64/libm.so.6 No LZMA support found for reading .gnu_debugdata section
warning: (x86_64) /lib64/libgcc_s.so.1 No LZMA support found for reading .gnu_debugdata section
Process 2644725 stopped
* thread #2, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x0000555555555530 a.out`copyableValueTest() at main.swift:24:11
21 //////////////////
22
23 public func copyableValueTest() async {
-> 24 print("stop here") // Set breakpoint 00
25 let k = Klass()
26 k.doSomething()
27 await forceSplit() // Set breakpoint 01
Target 0: (a.out) stopped.
(lldb) p k
error: Error while searching for SDK: HostInfoError
error: <EXPR>:2:1: cannot find 'k' in scope/path/to/swift/build-full/usr/lib/swift/linux/_StringPro...
k
^
(lldb) c
Process 2644725 resuming
stop here
Process 2644725 stopped
* thread #2, name = 'a.out', stop reason = breakpoint 2.1
frame #0: 0x00005555555555ec a.out`copyableValueTest() at main.swift:27:11
24 print("stop here") // Set breakpoint 00
25 let k = Klass()
26 k.doSomething()
-> 27 await forceSplit() // Set breakpoint 01
28 print("stop here") // Set breakpoint 02
29 let m = consume k
30 m.doSomething() // Set breakpoint 03
Target 0: (a.out) stopped.
(lldb) p k
(a.Klass) <uninitialized>
(lldb) c
Process 2644725 resuming
Process 2644725 stopped
* thread #2, name = 'a.out', stop reason = breakpoint 2.2
frame #0: 0x0000555555555658 a.out`copyableValueTest() at main.swift:27:11
24 print("stop here") // Set breakpoint 00
25 let k = Klass()
26 k.doSomething()
-> 27 await forceSplit() // Set breakpoint 01
28 print("stop here") // Set breakpoint 02
29 let m = consume k
30 m.doSomething() // Set breakpoint 03
Target 0: (a.out) stopped.
(lldb) p k
(a.Klass) 0x00007ffff0002850 {}
(lldb) c
Process 2644725 resuming
Process 2644725 stopped
* thread #2, name = 'a.out', stop reason = breakpoint 2.3
frame #0: 0x00005555555556d1 a.out`copyableValueTest() at main.swift:27:11
24 print("stop here") // Set breakpoint 00
25 let k = Klass()
26 k.doSomething()
-> 27 await forceSplit() // Set breakpoint 01
28 print("stop here") // Set breakpoint 02
29 let m = consume k
30 m.doSomething() // Set breakpoint 03
Target 0: (a.out) stopped.
(lldb) p k
error: <EXPR>:2:1: cannot find 'k' in scope
k
^
(lldb) c
Process 2644725 resuming
Process 2644725 stopped
* thread #2, name = 'a.out', stop reason = breakpoint 3.1
frame #0: 0x00005555555556ef a.out`copyableValueTest() at main.swift:28:11
25 let k = Klass()
26 k.doSomething()
27 await forceSplit() // Set breakpoint 01
-> 28 print("stop here") // Set breakpoint 02
29 let m = consume k
30 m.doSomething() // Set breakpoint 03
31 await forceSplit()
Target 0: (a.out) stopped.
(lldb) p k
(a.Klass) <uninitialized>
(lldb) c
Process 2644725 resuming
stop here
Process 2644725 stopped
* thread #2, name = 'a.out', stop reason = breakpoint 4.1
frame #0: 0x0000555555555789 a.out`copyableValueTest() at main.swift:30:7
27 await forceSplit() // Set breakpoint 01
28 print("stop here") // Set breakpoint 02
29 let m = consume k
-> 30 m.doSomething() // Set breakpoint 03
31 await forceSplit()
32 m.doSomething() // Set breakpoint 04
33 }
Target 0: (a.out) stopped.
(lldb) p k
error: <EXPR>:2:1: cannot find 'k' in scope
k
^
(lldb) c
Process 2644725 resuming
Process 2644725 stopped
* thread #2, name = 'a.out', stop reason = breakpoint 5.1
frame #0: 0x000055555555585e a.out`copyableValueTest() at main.swift:32:7
29 let m = consume k
30 m.doSomething() // Set breakpoint 03
31 await forceSplit()
-> 32 m.doSomething() // Set breakpoint 04
33 }
34
35 public func copyableVarTest() async {
Target 0: (a.out) stopped.
(lldb) p k
error: <EXPR>:2:1: cannot find 'k' in scope
k
^
(lldb) c
Process 2644725 resuming
stop here
stop here
stop here
Process 2644725 exited with status = 0 (0x00000000)
(lldb) q
Even when running lldb, I don't see how varK is initialized on line 24. Additionally, line 27 (await forceSplit()) creates three breakpoints, whereas the test code expects only two breakpoints.
The question is: why does this issue occur only on Fedora? Further investigation is needed.