Joining a channel crashes Zed

[bitfield]

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• Completed

Describe the bug / provide steps to reproduce it

When I click on any channel name in the collab panel, Zed reliably crashes.

Repro:

1. Open collab panel (Cmd-Shift-C)
2. Click on a channel name (for example "zed / development / ai")
3. Boom.

Unlike #9997, though, I can open the channel's chat with no problems. I'm guessing that clicking the channel name joins the audio call for the channel, and that seems to be the issue (Crashed Thread: 69 Dispatch queue: livekit.multicast).

Environment

Zed: v0.149.5 (Zed)
OS: macOS 10.15.7
Memory: 16 GiB
Architecture: x86_64

If applicable, attach your ~/Library/Logs/Zed/Zed.log file to this issue.

Nothing in Zed's log.

macOS crash report:

Process:               zed [20453]
Path:                  /Applications/Zed.app/Contents/MacOS/zed
Identifier:            zed
Version:               0.149.5 (20240822.190532)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           zed [20453]
User ID:               501
Date/Time:             2024-08-25 13:21:16.594 +0100

OS Version:            Mac OS X 10.15.7 (19H2026)

Report Version:        12

Anonymous UUID:        8487B56D-2533-0BD8-952E-DE5454B7D930
Time Awake Since Boot: 350000 seconds
System Integrity Protection: enabled
Crashed Thread:        69  Dispatch queue: livekit.multicast
Exception Type:        EXC_BAD_ACCESS (SIGSEGV)

Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000000

Exception Note:        EXC_CORPSE_NOTIFY
Termination Signal:    Segmentation fault: 11

Termination Reason:    Namespace SIGNAL, Code 0xb

Terminating Process:   exc handler [20453]
VM Regions Near 0:

-->

__TEXT                 0000000103478000-000000010a264000 [109.9M] r-x/r-x SM=COW  /Applications/Zed.app/Contents/MacOS/zed
... (other threads trimmed) ...
Thread 69 Crashed:: Dispatch queue: livekit.multicast

0   libswiftCore.dylib            	0x00007fff69461977 swift::ResolveAsSymbolicReference::operator()(swift::Demangle::SymbolicReferenceKind, swift::Demangle::Directness, int, void const*) + 55

1   libswiftCore.dylib            	0x00007fff6947d33d swift::Demangle::Demangler::demangleOperator() + 237

2   libswiftCore.dylib            	0x00007fff6947b938 swift::Demangle::Demangler::demangleType(llvm::StringRef, std::__1::function<swift::Demangle::Node* (swift::Demangle::SymbolicReferenceKind, swift::Demangle::Directness, int, void const*)>) + 168

3   libswiftCore.dylib            	0x00007fff69467156 swift_getTypeByMangledNameImpl(swift::MetadataRequest, llvm::StringRef, void const* const*, std::__1::function<swift::TargetMetadataswift::InProcess const* (unsigned int, unsigned int)>, std::__1::function<swift::TargetWitnessTableswift::InProcess const* (swift::TargetMetadataswift::InProcess const*, unsigned int)>) + 502

4   libswiftCore.dylib            	0x00007fff69464aa2 swift::swift_getTypeByMangledName(swift::MetadataRequest, llvm::StringRef, void const* const*, std::__1::function<swift::TargetMetadataswift::InProcess const* (unsigned int, unsigned int)>, std::__1::function<swift::TargetWitnessTableswift::InProcess const* (swift::TargetMetadataswift::InProcess const*, unsigned int)>) + 482

5   libswiftCore.dylib            	0x00007fff69464c99 swift_getTypeByMangledNameInContext + 153

6   dev.zed.Zed                   	0x0000000107c99a81 __swift_instantiateConcreteTypeFromMangledName + 49

7   dev.zed.Zed                   	0x0000000107cbb7be specialized Room.engine(_:didMutate:oldState:) + 1054

8   dev.zed.Zed                   	0x0000000107cb5e9d partial apply for closure #1 in closure #1 in Engine.init(connectOptions:) + 29

9   dev.zed.Zed                   	0x0000000107ce2b62 $s7LiveKit17MulticastDelegateC6notify5label_ySSycSg_yxctFyyYbcfU_AA06EngineD0_p_Tg5Tm + 930

10  dev.zed.Zed                   	0x0000000107ce67da $s7LiveKit17MulticastDelegateC6notify5label_ySSycSg_yxctFyyYbcfU_AA012SignalClientD0_p_Tg5TATm + 42

11  dev.zed.Zed                   	0x0000000107cd15d9 $sIegh_IeyBh_TR + 25

12  libdispatch.dylib             	0x00007fff69ad16c4 _dispatch_call_block_and_release + 12

13  libdispatch.dylib             	0x00007fff69ad2658 _dispatch_client_callout + 8

14  libdispatch.dylib             	0x00007fff69ad7c44 _dispatch_lane_serial_drain + 597

15  libdispatch.dylib             	0x00007fff69ad85d6 _dispatch_lane_invoke + 363

16  libdispatch.dylib             	0x00007fff69ae1c09 _dispatch_workloop_worker_thread + 596

17  libsystem_pthread.dylib       	0x00007fff69d30a3d _pthread_wqthread + 290

18  libsystem_pthread.dylib       	0x00007fff69d2fb77 start_wqthread + 15
... (other threads trimmed) ...
Thread 69 crashed with X86 Thread State (64-bit):

rax: 0x0000000000000001  rbx: 0x0000700005315a18  rcx: 0x000000000043b921  rdx: 0x0000000000000000

rdi: 0x0000700005315a18  rsi: 0x0000000000000000  rbp: 0x00007000053156a0  rsp: 0x0000700005315680

r8: 0x0000000109e2925f   r9: 0x00007000053163e0  r10: 0x00007ffeec787c80  r11: 0x00007fff694708a0

r12: 0x00007000053157f0  r13: 0x00007000053163e0  r14: 0x0000000000000001  r15: 0x0000000000000000

rip: 0x00007fff69461977  rfl: 0x0000000000010246  cr2: 0x0000000107c92900
Logical CPU:     0

Error Code:      0x0100001f

Trap Number:     133
... (binary images trimmed) ...
External Modification Summary:

Calls made by other processes targeting this process:

task_for_pid: 0

thread_create: 0

thread_set_state: 0

Calls made by this process:

task_for_pid: 0

thread_create: 0

thread_set_state: 0

Calls made by all processes on this machine:

task_for_pid: 284714

thread_create: 0

thread_set_state: 0
VM Region Summary:

ReadOnly portion of Libraries: Total=809.3M resident=0K(0%) swapped_out_or_unallocated=809.3M(100%)

Writable regions: Total=1.9G written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=1.9G(100%)
                            VIRTUAL   REGION

REGION TYPE                        SIZE    COUNT (non-coalesced)

===========                     =======  =======

Accelerate framework               384K        3

Activity Tracing                   256K        1

CG backing stores                  592K        2

CG image                            52K        9

CoreAnimation                      132K       19

CoreGraphics                         8K        1

CoreImage                           24K        6

CoreUI image data                  420K        8

Foundation                           4K        1

IOKit                             23.3M        3

Image IO                             4K        1

Kernel Alloc Once                    8K        1

MALLOC                             1.3G      265

MALLOC guard page                   32K        7

MALLOC_LARGE (reserved)           10.0M        5         reserved VM address space (unallocated)

MALLOC_NANO (reserved)           384.0M        1         reserved VM address space (unallocated)

STACK GUARD                        304K       76

Stack                            138.1M       78

Stack Guard                       56.0M        1

VM_ALLOCATE                      152.0G      775

VM_ALLOCATE (reserved)            17.2M       81         reserved VM address space (unallocated)

__DATA                            35.0M      375

__DATA_CONST                      3944K       31

__DATA_DIRTY                        128        1

__FONT_DATA                          4K        1

__LINKEDIT                       428.6M        7

__OBJC_RO                         32.3M        1

__OBJC_RW                         1860K        2

__TEXT                           380.7M      369

__UNICODE                          564K        1

mapped file                        2.3G       37

shared memory                      648K       18

===========                     =======  =======

TOTAL                            157.1G     2187

TOTAL, minus reserved VM space   156.7G     2187

[bitfield]

Most likely a dupe of #5384, but I'm not sure.

[bitfield]

Yep, this is #5384.