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[SR-9481] Swift 5: Memory mismanagement on Linux #51943

Open Lukasa opened 5 years ago

Lukasa commented 5 years ago
Previous ID SR-9481
Radar rdar://47020961
Original Reporter @Lukasa
Type Bug

Attachment: Download

Environment Swift version 5.0-dev (LLVM 9a8bf9ce12, Clang eba26b8d1c, Swift b74d54a27c) Target: x86_64-unknown-linux-gnu
Additional Detail from JIRA | | | |------------------|-----------------| |Votes | 1 | |Component/s | Compiler | |Labels | Bug, 5.0Regression, Miscompile, RunTimeCrash | |Assignee | None | |Priority | Medium | md5: 65641d9eaf1880afa480ebf91c9c2308

Issue Description:

When running the unit tests for swift-nio-http2 (https://github.com/apple/swift-nio-http2)'s master branch on Linux under the latest Swift 5 snapshot, the tests reliably segmentation fault partway through their execution.

When the tests are run under valgrind, we get substantial output. The full output is attached, but here is a sample:

==412== Invalid read of size 8
==412==    at 0x51D4EB3: _swift_release_(swift::HeapObject*) (in /root/.swift/usr/lib/swift/linux/libswiftCore.so)
==412==    by 0x1AF36B: outlined consume of NIO.IOData (Bootstrap.swift:0)
==412==    by 0x3D5A3C: outlined consume of NIOHTTP2.HTTP2Frame.FramePayload (<compiler-generated>:0)
==412==    by 0x3D6F7C: outlined destroy of NIOHTTP2.HTTP2Frame (<compiler-generated>:0)
==412==    by 0x4AE6A3: NIOHTTP2Tests.SimpleClientServerTests.testBasicRequestResponse() throws -> () (SimpleClientServerTests.swift:216)
==412==    by 0x4A82A5: partial apply forwarder with unmangled suffix ".270" (<compiler-generated>:0)
==412==    by 0x18C2E5: reabstraction thunk helper from @escaping @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) (<compiler-generated>:0)
==412==    by 0x4A822A: partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) (<compiler-generated>:0)
==412==    by 0x4146600: partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@error @owned Swift.Error) (in /root/.swift/usr/lib/swift/linux/libXCTest.so)
==412==    by 0x414642B: partial apply forwarder for closure #&#8203;1 (XCTest.XCTestCase) throws -> () in XCTest.(test in _3BE257A46ADB477C7BF2D39968B39F9D)<A where A: XCTest.XCTestCase>((A) -> () throws -> ()) -> (XCTest.XCTestCase) throws -> () (in /root/.swift/usr/lib/swift/linux/libXCTest.so)
==412==    by 0x4146393: partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error) (in /root/.swift/usr/lib/swift/linux/libXCTest.so)
==412==    by 0x4146668: reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error)partial apply forwarder with unmangled suffix ".37" (in /root/.swift/usr/lib/swift/linux/libXCTest.so)
==412==  Address 0x12567d48 is 8 bytes inside a block of size 72 free'd
==412==    at 0x4C30D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==412==    by 0x1B7E9E: NIO.ByteBuffer._Storage.__deallocating_deinit (ByteBuffer-core.swift:0)
==412==    by 0x51D5AAA: _swift_release_dealloc (in /root/.swift/usr/lib/swift/linux/libswiftCore.so)
==412==    by 0x1AF36B: outlined consume of NIO.IOData (Bootstrap.swift:0)
==412==    by 0x3D5A3C: outlined consume of NIOHTTP2.HTTP2Frame.FramePayload (<compiler-generated>:0)
==412==    by 0x3D77BC: destroy value witness for NIOHTTP2.HTTP2Frame (<compiler-generated>:0)
==412==    by 0x51CD63A: swift_arrayDestroy (in /root/.swift/usr/lib/swift/linux/libswiftCore.so)
==412==    by 0x4FB7F36: Swift._ContiguousArrayStorage.__deallocating_deinit (in /root/.swift/usr/lib/swift/linux/libswiftCore.so)
==412==    by 0x51D5AAA: _swift_release_dealloc (in /root/.swift/usr/lib/swift/linux/libswiftCore.so)
==412==    by 0x4ADA6C: NIOHTTP2Tests.SimpleClientServerTests.testBasicRequestResponse() throws -> () (SimpleClientServerTests.swift:207)
==412==    by 0x4A82A5: partial apply forwarder with unmangled suffix ".270" (<compiler-generated>:0)
==412==    by 0x18C2E5: reabstraction thunk helper from @escaping @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) (<compiler-generated>:0)
==412==  Block was alloc'd at
==412==    at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==412==    by 0x51D4931: swift_slowAlloc (in /root/.swift/usr/lib/swift/linux/libswiftCore.so)
==412==    by 0x51D499E: _swift_allocObject_(swift::TargetHeapMetadata<swift::InProcess> const*, unsigned long, unsigned long) (in /root/.swift/usr/lib/swift/linux/libswiftCore.so)
==412==    by 0x1B79FA: NIO.ByteBuffer._Storage.__allocating_init(bytesNoCopy: Swift.UnsafeMutableRawPointer, capacity: Swift.UInt32, allocator: NIO.ByteBufferAllocator) -> NIO.ByteBuffer._Storage (ByteBuffer-core.swift:0)
==412==    by 0x1B8F07: static NIO.ByteBuffer._Storage.reallocated(minimumCapacity: Swift.UInt32, allocator: NIO.ByteBufferAllocator) -> NIO.ByteBuffer._Storage (ByteBuffer-core.swift:280)
==412==    by 0x1B74EA: NIO.ByteBuffer.init(allocator: NIO.ByteBufferAllocator, startingCapacity: Swift.Int) -> NIO.ByteBuffer (ByteBuffer-core.swift:419)
==412==    by 0x1B73CA: NIO.ByteBufferAllocator.buffer(capacity: Swift.Int) -> NIO.ByteBuffer (ByteBuffer-core.swift:104)
==412==    by 0x4AD3E0: NIOHTTP2Tests.SimpleClientServerTests.testBasicRequestResponse() throws -> () (SimpleClientServerTests.swift:199)
==412==    by 0x4A82A5: partial apply forwarder with unmangled suffix ".270" (<compiler-generated>:0)
==412==    by 0x18C2E5: reabstraction thunk helper from @escaping @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) (<compiler-generated>:0)
==412==    by 0x4A822A: partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) (<compiler-generated>:0)
==412==    by 0x4146600: partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@error @owned Swift.Error) (in /root/.swift/usr/lib/swift/linux/libXCTest.so)

This output seems to suggest that we are double-freeing HTTP2Frame objects that are stored in an array of some kind.

So far I have not been able to produce a smaller reproducer, though I'll work on doing this. I also have so far failed to reproduce on macOS, though I'll also pursue doing that.

belkadan commented 5 years ago

@gottesmm, @slavapestov, look familiar?

gottesmm commented 5 years ago

@belkadan nope.

@Lukasa can you provide a full reproducer using ASAN instead of valgrind?

Lukasa commented 5 years ago

Yup, but it's not very helpful. The full output is below (basically identical in release and debug modes):

AddressSanitizer:DEADLYSIGNAL
=================================================================
==207==ERROR: AddressSanitizer: SEGV on unknown address 0x56325e00003d (pc 0x7f3b0e664aa8 bp 0x7fffaa997110 sp 0x7fffaa995cf0 T0)
==207==The signal is caused by a READ memory access.
    #&#8203;0 0x7f3b0e664aa7  (/root/.swift/usr/lib/swift/linux/libswiftCore.so+0x399aa7)
    #&#8203;1 0x5632f0b7c7fe  (/code/.build/x86_64-unknown-linux/release/swift-nio-http2PackageTests.xctest+0x5fd7fe)
    #&#8203;2 0x5632f0b6b9b0  (/code/.build/x86_64-unknown-linux/release/swift-nio-http2PackageTests.xctest+0x5ec9b0)
    #&#8203;3 0x5632f0b6be18  (/code/.build/x86_64-unknown-linux/release/swift-nio-http2PackageTests.xctest+0x5ece18)
    #&#8203;4 0x5632f06b881b  (/code/.build/x86_64-unknown-linux/release/swift-nio-http2PackageTests.xctest+0x13981b)
    #&#8203;5 0x5632f0b6b9d0  (/code/.build/x86_64-unknown-linux/release/swift-nio-http2PackageTests.xctest+0x5ec9d0)
    #&#8203;6 0x5632f0b6bc08  (/code/.build/x86_64-unknown-linux/release/swift-nio-http2PackageTests.xctest+0x5ecc08)
    #&#8203;7 0x7f3b0e909600  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x30600)
    #&#8203;8 0x7f3b0e90942b  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x3042b)
    #&#8203;9 0x7f3b0e909393  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x30393)
    #&#8203;10 0x7f3b0e909668  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x30668)
    #&#8203;11 0x7f3b0e8fb4c6  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x224c6)
    #&#8203;12 0x7f3b0e907ddc  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x2eddc)
    #&#8203;13 0x7f3b0e9076dc  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x2e6dc)
    #&#8203;14 0x7f3b0e90bde1  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x32de1)
    #&#8203;15 0x7f3b0e9099d7  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x309d7)
    #&#8203;16 0x7f3b0e90bde1  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x32de1)
    #&#8203;17 0x7f3b0e9099d7  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x309d7)
    #&#8203;18 0x7f3b0e90bde1  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x32de1)
    #&#8203;19 0x7f3b0e9099ef  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x309ef)
    #&#8203;20 0x7f3b0e90bde1  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x32de1)
    #&#8203;21 0x7f3b0e906452  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x2d452)
    #&#8203;22 0x5632f0d0413f  (/code/.build/x86_64-unknown-linux/release/swift-nio-http2PackageTests.xctest+0x78513f)
    #&#8203;23 0x7f3b0bc7cb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #&#8203;24 0x5632f068f479  (/code/.build/x86_64-unknown-linux/release/swift-nio-http2PackageTests.xctest+0x110479)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/root/.swift/usr/lib/swift/linux/libswiftCore.so+0x399aa7) 
==207==ABORTING

(The reproducer is the same: swift-nio-http2's test suite. I have still not been able to reproduce this on macOS, or in a different repo, but I suspect that's because I don't know what specific situation is triggering this.

Lukasa commented 5 years ago

This continues to manifest with the most recent Swift 5 snapshot (from the 28th of December).

Lukasa commented 5 years ago

Obtaining a reproducer is simple enough if you have Docker for Mac installed:

git clone https://github.com/apple/swift-nio-http2.git && cd swift-nio-http2 && docker-compose -f docker/docker-compose.yaml -f docker/docker-compose.1804.50.yaml run test

In the absence of Docker for Mac, obtaining a machine with Ubuntu 18.04 and a recent Swift 5 snapshot can be used to hit the issue as well:

git clone https://github.com/apple/swift-nio-http2.git && cd swift-nio-http2 && swift test
Lukasa commented 5 years ago

Created tracking radar: rdar://47020961

Lukasa commented 5 years ago

Incidentally, this reproduces in both release and debug mode, so I don't think there's any concern around the behaviour of the optimiser here.

weissi commented 5 years ago

still happening with the toolchain from the 20th Jan:

(lldb) bt
* thread #&#8203;1, name = 'swift-nio-http2', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  * frame #&#8203;0: 0x0000000000000000
    frame #&#8203;1: 0x00007ffff764caab libswiftCore.so`_swift_release_dealloc + 11
    frame #&#8203;2: 0x00005555555fe7ac swift-nio-http2PackageTests.xctest`outlined consume of NIO.IOData at <compiler-generated>:0
    frame #&#8203;3: 0x000055555583147d swift-nio-http2PackageTests.xctest`outlined consume of NIOHTTP2.HTTP2Frame.FramePayload at <compiler-generated>:0
    frame #&#8203;4: 0x00005555558329bd swift-nio-http2PackageTests.xctest`outlined destroy of HTTP2Frame at <compiler-generated>:0
    frame #&#8203;5: 0x000055555590bc84 swift-nio-http2PackageTests.xctest`SimpleClientServerTests.testBasicRequestResponse(self=<unavailable>) at SimpleClientServerTests.swift:216:9
    frame #&#8203;6: 0x0000555555905826 swift-nio-http2PackageTests.xctest`partial apply at <compiler-generated>:0
    frame #&#8203;7: 0x00005555555da8c6 swift-nio-http2PackageTests.xctest`thunk for @escaping @callee_guaranteed () -> (@error @owned Error) at <compiler-generated>:0
    frame #&#8203;8: 0x00005555559057ab swift-nio-http2PackageTests.xctest`partial apply for thunk for @escaping @callee_guaranteed () -> (@error @owned Error) at <compiler-generated>:0
    frame #&#8203;9: 0x00007ffff7ed3601 libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@error @owned Swift.Error) + 17
    frame #&#8203;10: 0x00007ffff7ed342c libXCTest.so`partial apply forwarder for closure #&#8203;1 (XCTest.XCTestCase) throws -> () in XCTest.(test in _3BE257A46ADB477C7BF2D39968B39F9D)<A where A: XCTest.XCTestCase>((A) -> () throws -> ()) -> (XCTest.XCTestCase) throws -> () + 92
    frame #&#8203;11: 0x00007ffff7ed3394 libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error) + 20
    frame #&#8203;12: 0x00007ffff7ed3669 libXCTest.so`reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error)partial apply forwarder with unmangled suffix ".37" + 9
    frame #&#8203;13: 0x00007ffff7ec54c7 libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error) to @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) + 39
    frame #&#8203;14: 0x00007ffff7ed1ddd libXCTest.so`XCTest.XCTestCase.invokeTest() -> () + 77
    frame #&#8203;15: 0x00007ffff7ed16dd libXCTest.so`XCTest.XCTestCase.perform(XCTest.XCTestRun) -> () + 173
    frame #&#8203;16: 0x00007ffff7ed5de2 libXCTest.so`XCTest.XCTest.run() -> () + 194
    frame #&#8203;17: 0x00007ffff7ed39d8 libXCTest.so`XCTest.XCTestSuite.perform(XCTest.XCTestRun) -> () + 232
    frame #&#8203;18: 0x00007ffff7ed5de2 libXCTest.so`XCTest.XCTest.run() -> () + 194
    frame #&#8203;19: 0x00007ffff7ed39d8 libXCTest.so`XCTest.XCTestSuite.perform(XCTest.XCTestRun) -> () + 232
    frame #&#8203;20: 0x00007ffff7ed5de2 libXCTest.so`XCTest.XCTest.run() -> () + 194
    frame #&#8203;21: 0x00007ffff7ed0453 libXCTest.so`XCTest.XCTMain(Swift.Array<(testCaseClass: XCTest.XCTestCase.Type, allTests: Swift.Array<(Swift.String, (XCTest.XCTestCase) throws -> ())>)>) -> Swift.Never + 1091
    frame #&#8203;22: 0x000055555598f110 swift-nio-http2PackageTests.xctest`main at LinuxMain.swift:29:4
    frame #&#8203;23: 0x00007ffff548db97 libc.so.6`__libc_start_main + 231
    frame #&#8203;24: 0x00005555555b96ca swift-nio-http2PackageTests.xctest`_start + 42
weissi commented 5 years ago

and because @gottesmm requested the ASan (symbolication is at the end):

(lldb) run
Process 410 launched: '/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest' (x86_64)
Test Suite 'Selected tests' started at 2019-01-21 12:08:50.001
Test Suite 'SimpleClientServerTests' started at 2019-01-21 12:08:50.004
Test Case 'SimpleClientServerTests.testBasicRequestResponse' started at 2019-01-21 12:08:50.004
Process 410 stopped
* thread #&#8203;1, name = 'swift-nio-http2', stop reason = signal SIGSEGV: invalid address (fault address: 0x55551cfffff4)
    frame #&#8203;0: 0x00007ffff764caa8 libswiftCore.so`_swift_release_dealloc + 8
libswiftCore.so`_swift_release_dealloc:
->  0x7ffff764caa8 <+8>:  callq  *-0x10(%rax)
    0x7ffff764caab <+11>: popq   %r13
    0x7ffff764caad <+13>: retq   
    0x7ffff764caae:       nop    
Target 0: (swift-nio-http2PackageTests.xctest) stopped.
(lldb) bt
* thread #&#8203;1, name = 'swift-nio-http2', stop reason = signal SIGSEGV: invalid address (fault address: 0x55551cfffff4)
  * frame #&#8203;0: 0x00007ffff764caa8 libswiftCore.so`_swift_release_dealloc + 8
    frame #&#8203;1: 0x000055555572be1c swift-nio-http2PackageTests.xctest`outlined consume of NIO.IOData at <compiler-generated>:0
    frame #&#8203;2: 0x0000555555c9e57d swift-nio-http2PackageTests.xctest`outlined consume of NIOHTTP2.HTTP2Frame.FramePayload at <compiler-generated>:0
    frame #&#8203;3: 0x0000555555ca28ed swift-nio-http2PackageTests.xctest`outlined destroy of HTTP2Frame at <compiler-generated>:0
    frame #&#8203;4: 0x0000555555e77de6 swift-nio-http2PackageTests.xctest`SimpleClientServerTests.testBasicRequestResponse(self=<unavailable>) at SimpleClientServerTests.swift:216:9
    frame #&#8203;5: 0x0000555555e68606 swift-nio-http2PackageTests.xctest`partial apply at <compiler-generated>:0
    frame #&#8203;6: 0x00005555556d05a6 swift-nio-http2PackageTests.xctest`thunk for @escaping @callee_guaranteed () -> (@error @owned Error) at <compiler-generated>:0
    frame #&#8203;7: 0x0000555555e6858b swift-nio-http2PackageTests.xctest`partial apply for thunk for @escaping @callee_guaranteed () -> (@error @owned Error) at <compiler-generated>:0
    frame #&#8203;8: 0x00007ffff7ed3601 libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@error @owned Swift.Error) + 17
    frame #&#8203;9: 0x00007ffff7ed342c libXCTest.so`partial apply forwarder for closure #&#8203;1 (XCTest.XCTestCase) throws -> () in XCTest.(test in _3BE257A46ADB477C7BF2D39968B39F9D)<A where A: XCTest.XCTestCase>((A) -> () throws -> ()) -> (XCTest.XCTestCase) throws -> () + 92
    frame #&#8203;10: 0x00007ffff7ed3394 libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error) + 20
    frame #&#8203;11: 0x00007ffff7ed3669 libXCTest.so`reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error)partial apply forwarder with unmangled suffix ".37" + 9
    frame #&#8203;12: 0x00007ffff7ec54c7 libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error) to @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) + 39
    frame #&#8203;13: 0x00007ffff7ed1ddd libXCTest.so`XCTest.XCTestCase.invokeTest() -> () + 77
    frame #&#8203;14: 0x00007ffff7ed16dd libXCTest.so`XCTest.XCTestCase.perform(XCTest.XCTestRun) -> () + 173
    frame #&#8203;15: 0x00007ffff7ed5de2 libXCTest.so`XCTest.XCTest.run() -> () + 194
    frame #&#8203;16: 0x00007ffff7ed39d8 libXCTest.so`XCTest.XCTestSuite.perform(XCTest.XCTestRun) -> () + 232
    frame #&#8203;17: 0x00007ffff7ed5de2 libXCTest.so`XCTest.XCTest.run() -> () + 194
    frame #&#8203;18: 0x00007ffff7ed39d8 libXCTest.so`XCTest.XCTestSuite.perform(XCTest.XCTestRun) -> () + 232
    frame #&#8203;19: 0x00007ffff7ed5de2 libXCTest.so`XCTest.XCTest.run() -> () + 194
    frame #&#8203;20: 0x00007ffff7ed0453 libXCTest.so`XCTest.XCTMain(Swift.Array<(testCaseClass: XCTest.XCTestCase.Type, allTests: Swift.Array<(Swift.String, (XCTest.XCTestCase) throws -> ())>)>) -> Swift.Never + 1091
    frame #&#8203;21: 0x0000555555f9c24e swift-nio-http2PackageTests.xctest`main at LinuxMain.swift:29:4
    frame #&#8203;22: 0x00007ffff5285b97 libc.so.6`__libc_start_main + 231
    frame #&#8203;23: 0x000055555566160a swift-nio-http2PackageTests.xctest`_start + 42
(lldb) cont
Process 410 resuming
AddressSanitizer:DEADLYSIGNAL
=================================================================
==410==ERROR: AddressSanitizer: SEGV on unknown address 0x55551cfffff4 (pc 0x7ffff764caa8 bp 0x7fffffffce20 sp 0x7fffffffcdf0 T0)
==410==The signal is caused by a READ memory access.
    #&#8203;0 0x7ffff764caa7  (/root/.swift/usr/lib/swift/linux/libswiftCore.so+0x399aa7)
    #&#8203;1 0x55555572be1b  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0x1d7e1b)
    #&#8203;2 0x555555c9e57c  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0x74a57c)
    #&#8203;3 0x555555ca28ec  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0x74e8ec)
    #&#8203;4 0x555555e77de5  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0x923de5)
    #&#8203;5 0x555555e68605  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0x914605)
    #&#8203;6 0x5555556d05a5  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0x17c5a5)
    #&#8203;7 0x555555e6858a  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0x91458a)
    #&#8203;8 0x7ffff7ed3600  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x30600)
    #&#8203;9 0x7ffff7ed342b  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x3042b)
    #&#8203;10 0x7ffff7ed3393  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x30393)
    #&#8203;11 0x7ffff7ed3668  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x30668)
    #&#8203;12 0x7ffff7ec54c6  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x224c6)
    #&#8203;13 0x7ffff7ed1ddc  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x2eddc)
    #&#8203;14 0x7ffff7ed16dc  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x2e6dc)
    #&#8203;15 0x7ffff7ed5de1  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x32de1)
    #&#8203;16 0x7ffff7ed39d7  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x309d7)
    #&#8203;17 0x7ffff7ed5de1  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x32de1)
    #&#8203;18 0x7ffff7ed39d7  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x309d7)
    #&#8203;19 0x7ffff7ed5de1  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x32de1)
    #&#8203;20 0x7ffff7ed0452  (/root/.swift/usr/lib/swift/linux/libXCTest.so+0x2d452)
    #&#8203;21 0x555555f9c24d  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0xa4824d)
    #&#8203;22 0x7ffff5285b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #&#8203;23 0x555555661609  (/code/.build/x86_64-unknown-linux/debug/swift-nio-http2PackageTests.xctest+0x10d609)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/root/.swift/usr/lib/swift/linux/libswiftCore.so+0x399aa7) 
==410==ABORTING
Process 410 exited with status = 1 (0x00000001) 
(lldb) image lookup --address 0x7ffff764caa7
      Address: libswiftCore.so[0x0000000000399aa7] (libswiftCore.so..text + 2556039)
      Summary: libswiftCore.so`_swift_release_dealloc + 7
(lldb) image lookup --address 0x55555572be1b
      Address: swift-nio-http2PackageTests.xctest[0x00000000001d7e1b] (swift-nio-http2PackageTests.xctest..text + 829499)
      Summary: swift-nio-http2PackageTests.xctest`outlined consume of NIO.IOData + 43
(lldb) image lookup --address 0x555555c9e57c
      Address: swift-nio-http2PackageTests.xctest[0x000000000074a57c] (swift-nio-http2PackageTests.xctest..text + 6541212)
      Summary: swift-nio-http2PackageTests.xctest`outlined consume of NIOHTTP2.HTTP2Frame.FramePayload + 92
(lldb) image lookup --address 0x555555ca28ec
      Address: swift-nio-http2PackageTests.xctest[0x000000000074e8ec] (swift-nio-http2PackageTests.xctest..text + 6558476)
      Summary: swift-nio-http2PackageTests.xctest`outlined destroy of NIOHTTP2.HTTP2Frame + 76 at <compiler-generated>
(lldb) image lookup --address 0x555555e77de5
      Address: swift-nio-http2PackageTests.xctest[0x0000000000923de5] (swift-nio-http2PackageTests.xctest..text + 8480773)
      Summary: swift-nio-http2PackageTests.xctest`NIOHTTP2Tests.SimpleClientServerTests.testBasicRequestResponse() throws -> () + 13509 at SimpleClientServerTests.swift:216:9
(lldb) image lookup --address 0x555555e68605
      Address: swift-nio-http2PackageTests.xctest[0x0000000000914605] (swift-nio-http2PackageTests.xctest..text + 8417317)
      Summary: swift-nio-http2PackageTests.xctest`partial apply forwarder with unmangled suffix ".270" + 37 at <compiler-generated>
(lldb) image lookup --address 0x5555556d05a5
      Address: swift-nio-http2PackageTests.xctest[0x000000000017c5a5] (swift-nio-http2PackageTests.xctest..text + 454597)
      Summary: swift-nio-http2PackageTests.xctest`reabstraction thunk helper from @escaping @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) + 21 at <compiler-generated>
(lldb) image lookup --address 0x555555e6858a
      Address: swift-nio-http2PackageTests.xctest[0x000000000091458a] (swift-nio-http2PackageTests.xctest..text + 8417194)
      Summary: swift-nio-http2PackageTests.xctest`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) + 26 at <compiler-generated>
(lldb) image lookup --address 0x7ffff7ed3600
      Address: libXCTest.so[0x0000000000030600] (libXCTest.so..text + 81440)
      Summary: libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@error @owned Swift.Error) + 16
(lldb) image lookup --address 0x7ffff7ed342b
      Address: libXCTest.so[0x000000000003042b] (libXCTest.so..text + 80971)
      Summary: libXCTest.so`partial apply forwarder for closure #&#8203;1 (XCTest.XCTestCase) throws -> () in XCTest.(test in _3BE257A46ADB477C7BF2D39968B39F9D)<A where A: XCTest.XCTestCase>((A) -> () throws -> ()) -> (XCTest.XCTestCase) throws -> () + 91
(lldb) image lookup --address 0x7ffff7ed3393
      Address: libXCTest.so[0x0000000000030393] (libXCTest.so..text + 80819)
      Summary: libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error) + 19
(lldb) image lookup --address 0x7ffff7ed3668
      Address: libXCTest.so[0x0000000000030668] (libXCTest.so..text + 81544)
      Summary: libXCTest.so`reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error)partial apply forwarder with unmangled suffix ".37" + 8
(lldb) image lookup --address 0x7ffff7ec54c6
      Address: libXCTest.so[0x00000000000224c6] (libXCTest.so..text + 23782)
      Summary: libXCTest.so`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@in_guaranteed XCTest.XCTestCase) -> (@out (), @error @owned Swift.Error) to @escaping @callee_guaranteed (@guaranteed XCTest.XCTestCase) -> (@error @owned Swift.Error) + 38
(lldb) image lookup --address 0x7ffff7ed1ddc
      Address: libXCTest.so[0x000000000002eddc] (libXCTest.so..text + 75260)
      Summary: libXCTest.so`XCTest.XCTestCase.invokeTest() -> () + 76
(lldb) image lookup --address 0x7ffff7ed16dc
      Address: libXCTest.so[0x000000000002e6dc] (libXCTest.so..text + 73468)
      Summary: libXCTest.so`XCTest.XCTestCase.perform(XCTest.XCTestRun) -> () + 172
(lldb) image lookup --address 0x7ffff7ed5de1
      Address: libXCTest.so[0x0000000000032de1] (libXCTest.so..text + 91649)
      Summary: libXCTest.so`XCTest.XCTest.run() -> () + 193
(lldb) image lookup --address 0x7ffff7ed39d7
      Address: libXCTest.so[0x00000000000309d7] (libXCTest.so..text + 82423)
      Summary: libXCTest.so`XCTest.XCTestSuite.perform(XCTest.XCTestRun) -> () + 231
(lldb) image lookup --address 0x7ffff7ed5de1
      Address: libXCTest.so[0x0000000000032de1] (libXCTest.so..text + 91649)
      Summary: libXCTest.so`XCTest.XCTest.run() -> () + 193
(lldb) image lookup --address 0x7ffff7ed39d7
      Address: libXCTest.so[0x00000000000309d7] (libXCTest.so..text + 82423)
      Summary: libXCTest.so`XCTest.XCTestSuite.perform(XCTest.XCTestRun) -> () + 231
(lldb) image lookup --address 0x7ffff7ed5de1
      Address: libXCTest.so[0x0000000000032de1] (libXCTest.so..text + 91649)
      Summary: libXCTest.so`XCTest.XCTest.run() -> () + 193
(lldb) image lookup --address 0x7ffff7ed0452
      Address: libXCTest.so[0x000000000002d452] (libXCTest.so..text + 68722)
      Summary: libXCTest.so`XCTest.XCTMain(Swift.Array<(testCaseClass: XCTest.XCTestCase.Type, allTests: Swift.Array<(Swift.String, (XCTest.XCTestCase) throws -> ())>)>) -> Swift.Never + 1090
(lldb) image lookup --address 0x555555f9c24d
      Address: swift-nio-http2PackageTests.xctest[0x0000000000a4824d] (swift-nio-http2PackageTests.xctest..text + 9677933)
      Summary: swift-nio-http2PackageTests.xctest`main + 2269 at LinuxMain.swift:29:4
(lldb) image lookup --address 0x7ffff5285b96
      Address: libc.so.6[0x0000000000021b96] (libc.so.6..text + 2246)
      Summary: libc.so.6`__libc_start_main + 230
(lldb) image lookup --address 0x555555661609
      Address: swift-nio-http2PackageTests.xctest[0x000000000010d609] (swift-nio-http2PackageTests.xctest..text + 41)
      Summary: swift-nio-http2PackageTests.xctest`_start + 41