[SR-15890] [Concurrency] swift_task_alloc crashes on Linux Armv7

[colemancda]

Previous ID	SR-15890
Radar	None
Original Reporter	@colemancda
Type	Bug
Status	In Progress
Resolution

Environment

Swift 5.5.3 StdLib cross compiled for Armv7 (Debian 11)

Additional Detail from JIRA

Votes	0
Component/s	Standard Library
Labels	Bug
Assignee	@colemancda
Priority	Medium

md5: 7bf4f333a4be27a31c1af5ff268782fd

Issue Description:

Swift concurrency is crashing on 32-bit ARM.

[colemancda]

Script to build for Debian 11 Armv7

Hello, world!
Will throw
Task ran
Segmentation fault

(LLDB)
Process 196075 launched: '/usr/local/bin/hello' (arm)
Hello, world!
Will throw
Task ran
Bye
Process 196075 stopped

• thread Initial implementation of a @_cdecl attribute to export top-level functions to C #3, name = 'hello', stop reason = signal SIGSEGV: invalid address (fault address: 0x2001500)
  frame #0: 0xf79f066a libswift_Concurrency.so`swift_task_alloc [inlined] swift::StackAllocator<1000u>::alloc(this=0x02001500, size=<unavailable>) at StackAllocator.h:276:58

(lldb) thread backtrace

• thread Initial implementation of a @_cdecl attribute to export top-level functions to C #3, name = 'hello', stop reason = signal SIGSEGV: invalid address (fault address: 0x2001500)

• frame #0: 0xf79f066a libswift_Concurrency.so`swift_task_alloc [inlined] swift::StackAllocator<1000u>::alloc(this=0x02001500, size=<unavailable>) at StackAllocator.h:276:58
  frame Redundant Load Elimination Patches #1: 0xf79f065a libswift_Concurrency.so`swift_task_alloc(size=<unavailable>) at TaskAlloc.cpp:50
  (lldb)

[colemancda]

Attaching build environment and diagnostic messages.

OS: Debian GNU/Linux bookworm/sid aarch64

Host: MediaTek krane sku176 board

Kernel: 5.17.0-rc3-cadmium

CPU: (8) @ 1.989GHz

Memory: 1766MiB / 3891MiB

Linux lenovo-duet 5.17.0-rc3-cadmium #1 SMP PREEMPT Fri Feb 11 00:51:25 PST 2022 aarch64 GNU/Linux

[colemancda]

This is the output when running via `qemu-arm-static` with concurrency debug logs enabled in a Debian 11 VM on MacBook Pro (M1 Pro)

coleman@macbook-linux:~/Developer/buildroot$ sudo chroot ~/Developer/buildroot/output/target /usr/bin/qemu-arm-static /usr/bin/hello
[999167600] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x400620a0, parent = (nil), slab 512
[999167600] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x400620a0 with parent (nil)
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0x3ffff5c0] Constructing VoucherManager
[999167600] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x400620a0)
[999167600] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x400620a0->flagAsRunning()
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0x3ffff5c0] Swapping jobs to 0x400620a0
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0x3ffff5c0] Swapping jobs to 0x400620a0, adopting voucher (nil)
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0x3ffff5c0] Saved original voucher (nil)
[999167600] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor 0x3dcd6540 to 0x3dcd6540
Hello, world!
[999167600] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x40062f90, parent = (nil), slab 512
[999167600] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x40062f90 with parent (nil)
[999167600] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x40062f90 on executor (nil)
[980411248] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0x3a6fd860] Constructing VoucherManager
[980411248] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x40062f90)
[980411248] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x40062f90->flagAsRunning()
[980411248] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0x3a6fd860] Swapping jobs to 0x40062f90
[980411248] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0x3a6fd860] Swapping jobs to 0x40062f90, adopting voucher (nil)
[980411248] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0x3a6fd860] Saved original voucher (nil)
[999167600] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x40063288, parent = (nil), slab 512
[999167600] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x40063288 with parent (nil)
[999167600] [../stdlib/public/Concurrency/TaskPrivate.h:399](flagAsSuspended) 0x400620a0->flagAsSuspended()
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:103](restoreVoucher) [0x3ffff5c0] Restoring voucher on task 0x400620a0
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:55](leave) [0x3ffff5c0] Leaving empty VoucherManager
Will throw
[980411248] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor (nil) to 0x3dcd6540
[980411248] [../stdlib/public/Concurrency/Actor.cpp:1887](swift_task_switchImpl) switch failed, task 0x40062f90 enqueued on executor 0x3dcd6540
[980411248] [../stdlib/public/Concurrency/TaskPrivate.h:399](flagAsSuspended) 0x40062f90->flagAsSuspended()
[980411248] [../stdlib/public/Concurrency/VoucherSupport.h:103](restoreVoucher) [0x3a6fd860] Restoring voucher on task 0x40062f90
[980411248] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x40062f90 on executor 0x3dcd6540
[980411248] [../stdlib/public/Concurrency/VoucherSupport.h:55](leave) [0x3a6fd860] Leaving empty VoucherManager
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0x392fe268] Constructing VoucherManager
[959443824] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x40062f90)
[959443824] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x40062f90->flagAsRunning()
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0x392fe268] Swapping jobs to 0x40062f90
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0x392fe268] Swapping jobs to 0x40062f90, adopting voucher (nil)
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0x392fe268] Saved original voucher (nil)
Task ran
[959443824] [../stdlib/public/Concurrency/Task.cpp:328](completeTaskImpl) task 0x40062f90 completed
[959443824] [../stdlib/public/Concurrency/Task.cpp:161](completeFuture) complete future = 0x40062f90
[959443824] [../stdlib/public/Concurrency/Task.cpp:198](completeFuture) task 0x40062f90 had no waiting tasks
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:46](leave) [0x392fe268] Restoring original voucher (nil)
[969929584] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0x39cfe1e0] Constructing VoucherManager
[969929584] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x40063288)
[969929584] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x40063288->flagAsRunning()
[969929584] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0x39cfe1e0] Swapping jobs to 0x40063288
[969929584] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0x39cfe1e0] Swapping jobs to 0x40063288, adopting voucher (nil)
[969929584] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0x39cfe1e0] Saved original voucher (nil)
[969929584] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x400620a0 on executor (nil)
[999154544] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0x3b8dd860] Constructing VoucherManager
[999154544] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x400620a0)
[999154544] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x400620a0->flagAsRunning()
[999154544] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0x3b8dd860] Swapping jobs to 0x400620a0
[999154544] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0x3b8dd860] Swapping jobs to 0x400620a0, adopting voucher (nil)
[999154544] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0x3b8dd860] Saved original voucher (nil)
[969929584] [../stdlib/public/Concurrency/Task.cpp:328](completeTaskImpl) task 0x40063288 completed
[969929584] [../stdlib/public/Concurrency/Task.cpp:161](completeFuture) complete future = 0x40063288
[969929584] [../stdlib/public/Concurrency/Task.cpp:198](completeFuture) task 0x40063288 had no waiting tasks
[969929584] [../stdlib/public/Concurrency/TaskPrivate.h:432](flagAsCompleted) task completed 0x40063288
[999154544] [../stdlib/public/Concurrency/TaskStatus.cpp:358](swift_task_removeStatusRecordImpl) remove status record = 0x40062350, from current task = 0x400620a0
[999154544] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor (nil) to 0x3dcd6540
[999154544] [../stdlib/public/Concurrency/Actor.cpp:1887](swift_task_switchImpl) switch failed, task 0x400620a0 enqueued on executor 0x3dcd6540
[999154544] [../stdlib/public/Concurrency/TaskPrivate.h:399](flagAsSuspended) 0x400620a0->flagAsSuspended()
[999154544] [../stdlib/public/Concurrency/VoucherSupport.h:103](restoreVoucher) [0x3b8dd860] Restoring voucher on task 0x400620a0
[999154544] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x400620a0 on executor 0x3dcd6540
[999154544] [../stdlib/public/Concurrency/VoucherSupport.h:55](leave) [0x3b8dd860] Leaving empty VoucherManager
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0x392fe268] Constructing VoucherManager
[959443824] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x400620a0)
[959443824] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x400620a0->flagAsRunning()
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0x392fe268] Swapping jobs to 0x400620a0
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0x392fe268] Swapping jobs to 0x400620a0, adopting voucher (nil)
[959443824] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0x392fe268] Saved original voucher (nil)
[959443824] [../stdlib/public/Concurrency/TaskPrivate.h:432](flagAsCompleted) task completed 0x40062f90
[959443824] [../stdlib/public/Concurrency/Task.cpp:255](destroyTask) destroy task 0x40062f90
[959443824] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor 0x3dcd6540 to 0x3dcd6540

coleman@macbook-linux:~/Developer/buildroot$ sudo chroot ~/Developer/buildroot/output/target /usr/bin/qemu-arm-static /usr/bin/hello
[999167600] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x400620a0, parent = (nil), slab 512
[999167600] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x400620a0 with parent (nil)
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0x3ffff5c0] Constructing VoucherManager
[999167600] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x400620a0)
[999167600] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x400620a0->flagAsRunning()
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0x3ffff5c0] Swapping jobs to 0x400620a0
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0x3ffff5c0] Swapping jobs to 0x400620a0, adopting voucher (nil)
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0x3ffff5c0] Saved original voucher (nil)
[999167600] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor 0x3dcd6540 to 0x3dcd6540
Hello, world!
[999167600] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x40062f90, parent = (nil), slab 512
[999167600] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x40062f90 with parent (nil)
[999167600] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x40062f90 on executor (nil)
[999167600] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x40063288, parent = (nil), slab 512
[999167600] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x40063288 with parent (nil)
[999167600] [../stdlib/public/Concurrency/TaskPrivate.h:399](flagAsSuspended) 0x400620a0->flagAsSuspended()
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:103](restoreVoucher) [0x3ffff5c0] Restoring voucher on task 0x400620a0
[999167600] [../stdlib/public/Concurrency/VoucherSupport.h:55](leave) [0x3ffff5c0] Leaving empty VoucherManager
qemu: uncaught target signal 4 (Illegal instruction) - core dumped
Illegal instruction

[colemancda]

[3070162544] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x1c280a0, parent = (nil), slab 512

[3070162544] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x1c280a0 with parent (nil)

[3070162544] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0xbe8bfba0] Constructing VoucherManager

[3070162544] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x1c280a0)

[3070162544] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x1c280a0->flagAsRunning()

[3070162544] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0xbe8bfba0] Swapping jobs to 0x1c280a0

[3070162544] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0xbe8bfba0] Swapping jobs to 0x1c280a0, adopting voucher (nil)

[3070162544] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0xbe8bfba0] Saved original voucher (nil)

[3070162544] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor 0xb54d0540 to 0xb54d0540

Hello, world!

[3070162544] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x1c28f78, parent = (nil), slab 512

[3070162544] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x1c28f78 with parent (nil)

[3070162544] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x1c28f78 on executor (nil)

[3070162544] [../stdlib/public/Concurrency/Task.cpp:567](swift_task_create_commonImpl) allocate task 0x1c29288, parent = (nil), slab 512

[3070162544] [../stdlib/public/Concurrency/Task.cpp:646](swift_task_create_commonImpl) creating task 0x1c29288 with parent (nil)

[3070162544] [../stdlib/public/Concurrency/TaskPrivate.h:399](flagAsSuspended) 0x1c280a0->flagAsSuspended()

[3070162544] [../stdlib/public/Concurrency/VoucherSupport.h:103](restoreVoucher) [0xbe8bfba0] Restoring voucher on task 0x1c280a0

[3070162544] [../stdlib/public/Concurrency/VoucherSupport.h:55](leave) [0xbe8bfba0] Leaving empty VoucherManager

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0xb30dd860] Constructing VoucherManager

[3004031856] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x1c28f78)

[3004031856] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x1c28f78->flagAsRunning()

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0xb30dd860] Swapping jobs to 0x1c28f78

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0xb30dd860] Swapping jobs to 0x1c28f78, adopting voucher (nil)

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0xb30dd860] Saved original voucher (nil)

Will throw

[3004031856] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor (nil) to 0xb54d0540

[3004031856] [../stdlib/public/Concurrency/Actor.cpp:1887](swift_task_switchImpl) switch failed, task 0x1c28f78 enqueued on executor 0xb54d0540

[3004031856] [../stdlib/public/Concurrency/TaskPrivate.h:399](flagAsSuspended) 0x1c28f78->flagAsSuspended()

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:103](restoreVoucher) [0xb30dd860] Restoring voucher on task 0x1c28f78

[3004031856] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x1c28f78 on executor 0xb54d0540

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:55](leave) [0xb30dd860] Leaving empty VoucherManager

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0xb14fe268] Constructing VoucherManager

[2974806896] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x1c28f78)

[2974806896] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x1c28f78->flagAsRunning()

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0xb14fe268] Swapping jobs to 0x1c28f78

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0xb14fe268] Swapping jobs to 0x1c28f78, adopting voucher (nil)

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0xb14fe268] Saved original voucher (nil)

Task ran

[2974806896] [../stdlib/public/Concurrency/Task.cpp:328](completeTaskImpl) task 0x1c28f78 completed

[2974806896] [../stdlib/public/Concurrency/Task.cpp:161](completeFuture) complete future = 0x1c28f78

[2974806896] [../stdlib/public/Concurrency/Task.cpp:198](completeFuture) task 0x1c28f78 had no waiting tasks

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:46](leave) [0xb14fe268] Restoring original voucher (nil)

[2995639152] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0xb28dc1e0] Constructing VoucherManager

[2995639152] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x1c29288)

[2995639152] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x1c29288->flagAsRunning()

[2995639152] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0xb28dc1e0] Swapping jobs to 0x1c29288

[2995639152] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0xb28dc1e0] Swapping jobs to 0x1c29288, adopting voucher (nil)

[2995639152] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0xb28dc1e0] Saved original voucher (nil)

[2995639152] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x1c280a0 on executor (nil)

[2995639152] [../stdlib/public/Concurrency/Task.cpp:328](completeTaskImpl) task 0x1c29288 completed

[2995639152] [../stdlib/public/Concurrency/Task.cpp:161](completeFuture) complete future = 0x1c29288

[2995639152] [../stdlib/public/Concurrency/Task.cpp:198](completeFuture) task 0x1c29288 had no waiting tasks

[2995639152] [../stdlib/public/Concurrency/TaskPrivate.h:432](flagAsCompleted) task completed 0x1c29288

[2995639152] [../stdlib/public/Concurrency/Task.cpp:255](destroyTask) destroy task 0x1c29288

[2995639152] [../stdlib/public/Concurrency/VoucherSupport.h:46](leave) [0xb28dc1e0] Restoring original voucher (nil)

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0xb30dd860] Constructing VoucherManager

[3004031856] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x1c280a0)

[3004031856] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x1c280a0->flagAsRunning()

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0xb30dd860] Swapping jobs to 0x1c280a0

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0xb30dd860] Swapping jobs to 0x1c280a0, adopting voucher (nil)

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0xb30dd860] Saved original voucher (nil)

[3004031856] [../stdlib/public/Concurrency/TaskStatus.cpp:358](swift_task_removeStatusRecordImpl) remove status record = 0x1c28350, from current task = 0x1c280a0

[3004031856] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor (nil) to 0xb54d0540

[3004031856] [../stdlib/public/Concurrency/Actor.cpp:1887](swift_task_switchImpl) switch failed, task 0x1c280a0 enqueued on executor 0xb54d0540

[3004031856] [../stdlib/public/Concurrency/TaskPrivate.h:399](flagAsSuspended) 0x1c280a0->flagAsSuspended()

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:103](restoreVoucher) [0xb30dd860] Restoring voucher on task 0x1c280a0

[3004031856] [../stdlib/public/Concurrency/Actor.cpp:1907](swift_task_enqueueImpl) enqueue job 0x1c280a0 on executor 0xb54d0540

[3004031856] [../stdlib/public/Concurrency/VoucherSupport.h:55](leave) [0xb30dd860] Leaving empty VoucherManager

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:36](VoucherManager) [0xb14fe268] Constructing VoucherManager

[2974806896] [../stdlib/public/Concurrency/Actor.cpp:1458](swift_job_runImpl) swift_job_runImpl(0x1c280a0)

[2974806896] [../stdlib/public/Concurrency/TaskPrivate.h:369](flagAsRunning) 0x1c280a0->flagAsRunning()

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:65](swapToJob) [0xb14fe268] Swapping jobs to 0x1c280a0

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:73](swapToJob) [0xb14fe268] Swapping jobs to 0x1c280a0, adopting voucher (nil)

[2974806896] [../stdlib/public/Concurrency/VoucherSupport.h:91](swapToJob) [0xb14fe268] Saved original voucher (nil)

[2974806896] [../stdlib/public/Concurrency/TaskPrivate.h:432](flagAsCompleted) task completed 0x1c28f78

[2974806896] [../stdlib/public/Concurrency/Task.cpp:255](destroyTask) destroy task 0x1c28f78

[2974806896] [../stdlib/public/Concurrency/Actor.cpp:1850](swift_task_switchImpl) trying to switch from executor 0xb54d0540 to 0xb54d0540

[colemancda]

The issue is not present when building the Std Lib in `Debug` mode, only when building in `Release` with cmake.

[colemancda]

[3069515376] [../stdlib/public/Concurrency/Task.cpp:567] allocate task 0x1ea8888, parent = (nil), slab 512

[3069515376] [../stdlib/public/Concurrency/Task.cpp:646] creating task 0x1ea8888 with parent (nil)

[3069515376] [../stdlib/public/Concurrency/VoucherSupport.h:36] [0xbec83bbc] Constructing VoucherManager

[3069515376] [../stdlib/public/Concurrency/Actor.cpp:1458] swift_job_runImpl(0x1ea8888)

[3069515376] [../stdlib/public/Concurrency/TaskPrivate.h:369] 0x1ea8888->flagAsRunning()

[3069515376] [../stdlib/public/Concurrency/VoucherSupport.h:65] [0xbec83bbc] Swapping jobs to 0x1ea8888

[3069515376] [../stdlib/public/Concurrency/VoucherSupport.h:73] [0xbec83bbc] Swapping jobs to 0x1ea8888, adopting voucher (nil)

[3069515376] [../stdlib/public/Concurrency/VoucherSupport.h:91] [0xbec83bbc] Saved original voucher (nil)

[3069515376] [../stdlib/public/Concurrency/Actor.cpp:1850] trying to switch from executor 0xb6083100 to 0xb6083100

Hello, world!

[3069515376] [../stdlib/public/Concurrency/Task.cpp:567] allocate task 0x1ea9388, parent = (nil), slab 512

[3069515376] [../stdlib/public/Concurrency/Task.cpp:646] creating task 0x1ea9388 with parent (nil)

[3069515376] [../stdlib/public/Concurrency/Actor.cpp:1907] enqueue job 0x1ea9388 on executor (nil)

[3069515376] [../stdlib/public/Concurrency/Task.cpp:567] allocate task 0x1ea96a8, parent = (nil), slab 512

[3069515376] [../stdlib/public/Concurrency/Task.cpp:646] creating task 0x1ea96a8 with parent (nil)

[3069515376] [../stdlib/public/Concurrency/TaskPrivate.h:399] 0x1ea8888->flagAsSuspended()

[3069515376] [../stdlib/public/Concurrency/VoucherSupport.h:103] [0xbec83bbc] Restoring voucher on task 0x1ea8888

[3069515376] [../stdlib/public/Concurrency/VoucherSupport.h:55] [0xbec83bbc] Leaving empty VoucherManager

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:36] [0xb3cc2c0c] Constructing VoucherManager

[3016504176] [../stdlib/public/Concurrency/Actor.cpp:1458] swift_job_runImpl(0x1ea9388)

[3016504176] [../stdlib/public/Concurrency/TaskPrivate.h:369] 0x1ea9388->flagAsRunning()

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:65] [0xb3cc2c0c] Swapping jobs to 0x1ea9388

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:73] [0xb3cc2c0c] Swapping jobs to 0x1ea9388, adopting voucher (nil)

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:91] [0xb3cc2c0c] Saved original voucher (nil)

Will throw

[3016504176] [../stdlib/public/Concurrency/Actor.cpp:1850] trying to switch from executor (nil) to 0xb6083100

[3016504176] [../stdlib/public/Concurrency/Actor.cpp:1887] switch failed, task 0x1ea9388 enqueued on executor 0xb6083100

[3016504176] [../stdlib/public/Concurrency/TaskPrivate.h:399] 0x1ea9388->flagAsSuspended()

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:103] [0xb3cc2c0c] Restoring voucher on task 0x1ea9388

[3016504176] [../stdlib/public/Concurrency/Actor.cpp:1907] enqueue job 0x1ea9388 on executor 0xb6083100

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:55] [0xb3cc2c0c] Leaving empty VoucherManager

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:36] [0xb18fdb5c] Constructing VoucherManager

[2978997104] [../stdlib/public/Concurrency/Actor.cpp:1458] swift_job_runImpl(0x1ea9388)

[2978997104] [../stdlib/public/Concurrency/TaskPrivate.h:369] 0x1ea9388->flagAsRunning()

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:65] [0xb18fdb5c] Swapping jobs to 0x1ea9388

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:73] [0xb18fdb5c] Swapping jobs to 0x1ea9388, adopting voucher (nil)

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:91] [0xb18fdb5c] Saved original voucher (nil)

Task ran

[2978997104] [../stdlib/public/Concurrency/Task.cpp:328] task 0x1ea9388 completed

[2978997104] [../stdlib/public/Concurrency/Task.cpp:161] complete future = 0x1ea9388

[2978997104] [../stdlib/public/Concurrency/Task.cpp:198] task 0x1ea9388 had no waiting tasks

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:46] [0xb18fdb5c] Restoring original voucher (nil)

[3008111472] [../stdlib/public/Concurrency/VoucherSupport.h:36] [0xb34c1b24] Constructing VoucherManager

[3008111472] [../stdlib/public/Concurrency/Actor.cpp:1458] swift_job_runImpl(0x1ea96a8)

[3008111472] [../stdlib/public/Concurrency/TaskPrivate.h:369] 0x1ea96a8->flagAsRunning()

[3008111472] [../stdlib/public/Concurrency/VoucherSupport.h:65] [0xb34c1b24] Swapping jobs to 0x1ea96a8

[3008111472] [../stdlib/public/Concurrency/VoucherSupport.h:73] [0xb34c1b24] Swapping jobs to 0x1ea96a8, adopting voucher (nil)

[3008111472] [../stdlib/public/Concurrency/VoucherSupport.h:91] [0xb34c1b24] Saved original voucher (nil)

[3008111472] [../stdlib/public/Concurrency/Actor.cpp:1907] enqueue job 0x1ea8888 on executor (nil)

[3008111472] [../stdlib/public/Concurrency/Task.cpp:328] task 0x1ea96a8 completed

[3008111472] [../stdlib/public/Concurrency/Task.cpp:161] complete future = 0x1ea96a8

[3008111472] [../stdlib/public/Concurrency/Task.cpp:198] task 0x1ea96a8 had no waiting tasks

[3008111472] [../stdlib/public/Concurrency/TaskPrivate.h:432] task completed 0x1ea96a8

[3008111472] [../stdlib/public/Concurrency/Task.cpp:255] destroy task 0x1ea96a8

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:36] [0xb3cc2c0c] Constructing VoucherManager

[3016504176] [../stdlib/public/Concurrency/Actor.cpp:1458] swift_job_runImpl(0x1ea8888)

[3016504176] [../stdlib/public/Concurrency/TaskPrivate.h:369] 0x1ea8888->flagAsRunning()

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:65] [0xb3cc2c0c] Swapping jobs to 0x1ea8888

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:73] [0xb3cc2c0c] Swapping jobs to 0x1ea8888, adopting voucher (nil)

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:91] [0xb3cc2c0c] Saved original voucher (nil)

[3016504176] [../stdlib/public/Concurrency/TaskStatus.cpp:358] remove status record = 0x1ea8ec0, from current task = 0x1ea8888

[3016504176] [../stdlib/public/Concurrency/Actor.cpp:1850] trying to switch from executor (nil) to 0xb6083100

[3016504176] [../stdlib/public/Concurrency/Actor.cpp:1887] switch failed, task 0x1ea8888 enqueued on executor 0xb6083100

[3016504176] [../stdlib/public/Concurrency/TaskPrivate.h:399] 0x1ea8888->flagAsSuspended()

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:103] [0xb3cc2c0c] Restoring voucher on task 0x1ea8888

[3016504176] [../stdlib/public/Concurrency/Actor.cpp:1907] enqueue job 0x1ea8888 on executor 0xb6083100

[3016504176] [../stdlib/public/Concurrency/VoucherSupport.h:55] [0xb3cc2c0c] Leaving empty VoucherManager

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:36] [0xb18fdb5c] Constructing VoucherManager

[2978997104] [../stdlib/public/Concurrency/Actor.cpp:1458] swift_job_runImpl(0x1ea8888)

[2978997104] [../stdlib/public/Concurrency/TaskPrivate.h:369] 0x1ea8888->flagAsRunning()

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:65] [0xb18fdb5c] Swapping jobs to 0x1ea8888

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:73] [0xb18fdb5c] Swapping jobs to 0x1ea8888, adopting voucher (nil)

[2978997104] [../stdlib/public/Concurrency/VoucherSupport.h:91] [0xb18fdb5c] Saved original voucher (nil)

Segmentation fault (core dumped)

[colemancda]

Process 600680 launched: '/home/coleman/Developer/swift-armv7/build/swift-hello/armv7-unknown-linux-gnueabihf/debug/swift-hello' (arm)
swift-hello: /home/coleman/Developer/swift-armv7/downloads/swift-swift-5.6.1-RELEASE/stdlib/public/Concurrency/../runtime/StackAllocator.h:291: void *swift::StackAllocator<1000, &swift::TaskAllocatorSlabMetadata>::alloc(size_t) [SlabCapacity = 1000, SlabMetadataPtr = &swift::TaskAllocatorSlabMetadata]: Assertion `llvm::isAddrAligned(llvm::Align(alignment), allocation->getAllocatedMemory())' failed.
This version of LLDB has no plugin for the mipsassem language. Inspection of frame variables will be limited.
Process 600680 stopped
* thread #1, name = 'swift-hello', stop reason = signal SIGABRT
    frame #0: 0xf670bc66 libc.so.6`__libc_do_syscall at libc-do-syscall.S:47
(lldb) thread backtrace'
error: unknown command shorthand suffix: '''
(lldb) thread backtrace
* thread #1, name = 'swift-hello', stop reason = signal SIGABRT
  * frame #0: 0xf670bc66 libc.so.6`__libc_do_syscall at libc-do-syscall.S:47
    frame #1: 0xf671aea0 libc.so.6`__GI_raise at internal-signals.h:86:3
    frame #2: 0xf671ae90 libc.so.6`__GI_raise(sig=<unavailable>) at raise.c:48
    frame #3: 0xf670b7a2 libc.so.6`__GI_abort at abort.c:79:7
    frame #4: 0xf6716140 libc.so.6`__assert_fail_base(fmt="", assertion="llvm::isAddrAligned(llvm::Align(alignment), allocation->getAllocatedMemory())", file=0x00000000, line=291, function="void *swift::StackAllocator<1000, &swift::TaskAllocatorSlabMetadata>::alloc(size_t) [SlabCapacity = 1000, SlabMetadataPtr = &swift::TaskAllocatorSlabMetadata]") at assert.c:92:3
    frame #5: 0xf67161ca libc.so.6`__GI___assert_fail(assertion=0x00000000, file="", line=291, function="") at assert.c:101:3
    frame #6: 0xf76814c0 libswift_Concurrency.so`swift::StackAllocator<1000u, &(swift::TaskAllocatorSlabMetadata)>::alloc(this=0x004643d0, size=36) at StackAllocator.h:290:5
    frame #7: 0xf768131a libswift_Concurrency.so`::swift_task_alloc(size=32) at TaskAlloc.cpp:51:45
    frame #8: 0x0043941c swift-hello`$sIetH_yts5Error_pIegHrzo_TRTA at <compiler-generated>:0
    frame #9: 0xf7675e66 libswift_Concurrency.so`swift::runJobInEstablishedExecutorContext(job=0x004643a0) at Actor.cpp:238:11
    frame #10: 0xf7676860 libswift_Concurrency.so`swift_job_runImpl(job=0x004643a0, executor=ExecutorRef @ 0xfffef4c0) at Actor.cpp:1488:3
    frame #11: 0xf767681e libswift_Concurrency.so`::swift_job_run(job=0x004643a0, executor=ExecutorRef @ 0xfffef4e0) at CompatibilityOverrideConcurrency.def:76:1
    frame #12: 0x00439308 swift-hello`main at Hello.swift:0
    frame #13: 0xf670ba20 libc.so.6`__libc_start_main(main=(swift-hello`main), argc=1, argv=0xfffef664, init=<unavailable>, fini=(swift-hello`__libc_csu_fini + 1), rtld_fini=(ld-2.31.so`_dl_fini + 1 at dl-fini.c:30:1), stack_end=0xfffef664) at libc-start.c:308:16
    frame #14: 0x004373ac swift-hello`_start + 52

[colemancda]

@buttaface is this reproducible on Android? It's only reproducible for me with debug builds on Swift 5.5 - 5.6.

[finagolfin]

I don't build the debug stdlib for armv7 unless I'm debugging something in particular, which I haven't been lately. I will build it and let you know.

[colemancda]

Not reproducible with Swift 5.7.1 built with -RA or --debug-swift-stdlib.