FYI: macOS 26 beta 3 linker crash #146
Description
I analysed the failure, under macOS 26 beta 3, of:
FAIL: objc.dg/gnu-api-2-protocol.m -fnext-runtime (test for excess errors)
UNRESOLVED: objc.dg/gnu-api-2-protocol.m -fnext-runtime compilation failed to produce executable
and filed it as FB18879030 "ld crash when linking object file"
Linking the attached object file with ld (from CLT 26 beta 3) leads to a crash of the ld process. The crash log is attached (ld-2025-07-16-145422.ips). The command that triggers the crash (not always, but about 15% of the time) is:
/usr/bin/ld -syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX26.sdk/ -dynamic -o ./gnu-api-2-protocol.exe ./gnu-api-2-protocol.o -lobjc -lSystemI believe the object file is valid, and even if it is not valid, it should be rejected with an error message and not cause a crash. To give more context, the object file is produced by the following clang command line:
"/Library/Developer/CommandLineTools/usr/bin/clang" -cc1as -triple arm64-apple-macosx26.0.0 -target-sdk-version=26.0 -filetype obj -main-file-name gnu-api-2-protocol.s -target-cpu apple-m1 -target-feature +zcm -target-feature +zcz -target-feature +v8.5a -target-feature +aes -target-feature +altnzcv -target-feature +ccdp -target-feature +complxnum -target-feature +crc -target-feature +dotprod -target-feature +fp-armv8 -target-feature +fp16fml -target-feature +fptoint -target-feature +fullfp16 -target-feature +jsconv -target-feature +lse -target-feature +neon -target-feature +pauth -target-feature +perfmon -target-feature +predres -target-feature +ras -target-feature +rcpc -target-feature +rdm -target-feature +sb -target-feature +sha2 -target-feature +sha3 -target-feature +specrestrict -target-feature +ssbs -fdebug-compilation-dir=/Users/fx/ibin/gcc/testsuite -dwarf-debug-producer "Apple clang version 17.0.0 (clang-1700.3.13.4)" -dwarf-version=5 -mrelocation-model pic -o ./gnu-api-2-protocol.o ./gnu-api-2-protocol.sBased on the gnu-api-2-protocol.s asm file also attached.
The crash report is as follows:
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Process: ld [31541]
Path: /Library/Developer/CommandLineTools/usr/bin/ld
Identifier: ld
Version: ???
Code Type: ARM-64 (Native)
Role: Unspecified
Parent Process: zsh [30067]
Coalition: com.googlecode.iterm2 [1414]
Responsible Process: iTerm2 [30060]
User ID: 501
Date/Time: 2025-07-16 14:54:22.1976 +0200
Launch Time: 2025-07-16 14:54:22.1514 +0200
Hardware Model: Mac14,12
OS Version: macOS 26.0 (25A5306g)
Release Type: User
Crash Reporter Key: AAA777FE-1B6F-066E-28D4-1DE9D1C0D2AF
Incident Identifier: F40E7361-0CB6-4F4E-9ACF-00AED183981F
Sleep/Wake UUID: 46EF3502-7525-4BE7-9FED-D47EEE14A9B7
Time Awake Since Boot: 24000 seconds
Time Since Wake: 934 seconds
System Integrity Protection: enabled
Triggered by Thread: 0
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x000000019ed665b8
Termination Reason: Namespace SIGNAL, Code 5, Trace/BPT trap: 5
Terminating Process: exc handler [31541]
Application Specific Information:
BUG IN CLIENT OF LIBMALLOC: memory corruption of free block
Abort Cause 38705562912
Thread 0 Crashed:
0 libsystem_malloc.dylib 0x19ed665b8 _xzm_xzone_malloc_freelist_outlined + 748
1 libc++abi.dylib 0x19eef8a78 operator new(unsigned long) + 52
2 ld 0x104e9d4e0 std::__1::pair<std::__1::__hash_iterator<std::__1::__hash_node<std::__1::__hash_value_type<unsigned int, unsigned int>, void*>*>, bool> std::__1::__hash_table<std::__1::__hash_value_type<unsigned int, unsigned int>, std::__1::__unordered_map_hasher<unsigned int, std::__1::__hash_value_type<unsigned int, unsigned int>, std::__1::hash<unsigned int>, std::__1::equal_to<unsigned int>, true>, std::__1::__unordered_map_equal<unsigned int, std::__1::__hash_value_type<unsigned int, unsigned int>, std::__1::equal_to<unsigned int>, std::__1::hash<unsigned int>, true>, std::__1::allocator<std::__1::__hash_value_type<unsigned int, unsigned int>>>::__emplace_unique_key_args<unsigned int, std::__1::piecewise_construct_t const&, std::__1::tuple<unsigned int const&>, std::__1::tuple<>>(unsigned int const&, std::__1::piecewise_construct_t const&, std::__1::tuple<unsigned int const&>&&, std::__1::tuple<>&&) + 208
3 ld 0x104e9b254 mach_o::CompactUnwindWriter::makeCompressedSecondLevelPage(std::__1::vector<mach_o::CompactUnwindWriter::WriterUnwindInfo, std::__1::allocator<mach_o::CompactUnwindWriter::WriterUnwindInfo>> const&, std::__1::unordered_map<unsigned int, unsigned int, std::__1::hash<unsigned int>, std::__1::equal_to<unsigned int>, std::__1::allocator<std::__1::pair<unsigned int const, unsigned int>>> const&, unsigned int, unsigned long&, unsigned char*&, unwind_info_section_header_lsda_index_entry*&) + 248
4 ld 0x104e9b9b4 mach_o::CompactUnwindWriter::CompactUnwindWriter(mach_o::Architecture, std::__1::vector<mach_o::CompactUnwindWriter::WriterUnwindInfo, std::__1::allocator<mach_o::CompactUnwindWriter::WriterUnwindInfo>>) + 716
5 ld 0x104f7a570 invocation function for block in ld::LayoutExecutable::assignAddresses() + 3988
6 libdispatch.dylib 0x19ed9dabc _dispatch_client_callout2 + 16
7 libdispatch.dylib 0x19ed987c8 _dispatch_apply_invoke3 + 336
8 libdispatch.dylib 0x19ed9daa4 _dispatch_client_callout + 16
9 libdispatch.dylib 0x19ed86a40 _dispatch_once_callout + 32
10 libdispatch.dylib 0x19ed98e70 _dispatch_apply_invoke_and_wait + 372
11 libdispatch.dylib 0x19ed97f64 _dispatch_apply_with_attr_f + 1312
12 libdispatch.dylib 0x19ed980ec dispatch_apply + 96
13 ld 0x104f78828 ld::LayoutExecutable::assignAddresses() + 3180
14 ld 0x104f2173c main + 9908
15 dyld 0x19eb89924 start + 6400
Thread 1:
0 libsystem_pthread.dylib 0x19ef3bb6c start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x19ef3bb6c start_wqthread + 0
Thread 3:
0 libsystem_pthread.dylib 0x19ef3bb6c start_wqthread + 0
Thread 4:
0 libsystem_pthread.dylib 0x19ef3bb6c start_wqthread + 0
Thread 5:
0 libsystem_kernel.dylib 0x19eefdca0 syscall_thread_switch + 8
1 libdispatch.dylib 0x19ed962a0 __DISPATCH_ROOT_QUEUE_CONTENDED_WAIT__ + 112
2 libdispatch.dylib 0x19ed96164 _dispatch_root_queue_drain + 808
3 libdispatch.dylib 0x19ed96764 _dispatch_worker_thread2 + 180
4 libsystem_pthread.dylib 0x19ef3ce2c _pthread_wqthread + 232
5 libsystem_pthread.dylib 0x19ef3bb74 start_wqthread + 8
Thread 6:
0 libsystem_pthread.dylib 0x19ef3bb6c start_wqthread + 0
Thread 7:
0 libsystem_pthread.dylib 0x19ef3bb6c start_wqthread + 0
Thread 8:
0 libsystem_pthread.dylib 0x19ef3bb6c start_wqthread + 0
Thread 9:
0 libsystem_kernel.dylib 0x19eefdca0 syscall_thread_switch + 8
1 libdispatch.dylib 0x19ed962a0 __DISPATCH_ROOT_QUEUE_CONTENDED_WAIT__ + 112
2 libdispatch.dylib 0x19ed96164 _dispatch_root_queue_drain + 808
3 libdispatch.dylib 0x19ed96764 _dispatch_worker_thread2 + 180
4 libsystem_pthread.dylib 0x19ef3ce2c _pthread_wqthread + 232
5 libsystem_pthread.dylib 0x19ef3bb74 start_wqthread + 8
Thread 10:
0 libsystem_pthread.dylib 0x19ef3bb6c start_wqthread + 0
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x000000010524c000 x1: 0x000000010524c5a0 x2: 0x0000000000000000 x3: 0x0000000105251dc0
x4: 0x0000000903080520 x5: 0x0000000000000000 x6: 0x0000000902041da0 x7: 0x001b10d2004ec852
x8: 0x0000000903080520 x9: 0x0000000000000000 x10: 0x9fd9f3ba31c5d409 x11: 0x001b10d2004ec852
x12: 0x0000000903080000 x13: 0x0000000000000001 x14: 0xffffffffb00007ff x15: 0x00000000003ff800
x16: 0x00000002a3309e88 x17: 0xfffff0003ffff800 x18: 0x0000000000000000 x19: 0x0000000000000018
x20: 0x00000c00413a7538 x21: 0x000000016af64ea8 x22: 0x0000000000000005 x23: 0x00000000030000a0
x24: 0x0000000000000003 x25: 0x0000000000000028 x26: 0x0000000000000fdc x27: 0x000000090348007c
x28: 0x0000000000000003 fp: 0x000000016af64e00 lr: 0x000000019eef8a78
sp: 0x000000016af64da0 pc: 0x000000019ed665b8 cpsr: 0xa0001000
far: 0x0000000000000000 esr: 0xf2000001 (Breakpoint) brk 1
Binary Images:
0x104e98000 - 0x104ffbfff ld (*) <1d3f29a3-17f7-3542-952f-afe2ddabda17> /Library/Developer/CommandLineTools/usr/bin/ld
0x105138000 - 0x105177fff libtapi.dylib (*) <9c5f7052-ea8c-3e69-9590-dc06d6100254> /Library/Developer/CommandLineTools/usr/lib/libtapi.dylib
0x1051b0000 - 0x1051b3fff libcodedirectory.dylib (*) <a375f776-4806-3c4f-abc5-3ff06a14b466> /Library/Developer/CommandLineTools/usr/lib/libcodedirectory.dylib
0x10d4dc000 - 0x11038ffff libLTO.dylib (*) <36b992c9-75d4-30b9-bcd0-a4522c6e5b7f> /Library/Developer/CommandLineTools/usr/lib/libLTO.dylib
0x105374000 - 0x1053e7fff libswiftDemangle.dylib (*) <db27dbac-a229-3330-b4c6-e3a71d8d0cbe> /Library/Developer/CommandLineTools/usr/lib/libswiftDemangle.dylib
0x19ed38000 - 0x19ed81717 libsystem_malloc.dylib (*) <7440e252-03d5-3eb5-ade6-64622d1a294c> /usr/lib/system/libsystem_malloc.dylib
0x19eee2000 - 0x19eefc92f libc++abi.dylib (*) <160ddaad-783d-359f-ad62-4d6404540944> /usr/lib/libc++abi.dylib
0x19ed82000 - 0x19edc8e5f libdispatch.dylib (*) <a9e1f982-bffc-3c91-9162-aec420eb9ce1> /usr/lib/system/libdispatch.dylib
0x19eb81000 - 0x19ec1eff3 dyld (*) <ff357121-622e-3ea0-9ef0-8d706f44dc1a> /usr/lib/dyld
0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
0x19ef3a000 - 0x19ef46a47 libsystem_pthread.dylib (*) <2343bc28-5611-33e3-8973-ec65386b41b4> /usr/lib/system/libsystem_pthread.dylib
0x19eefd000 - 0x19ef3945f libsystem_kernel.dylib (*) <1e34cd87-f0a3-376f-b87f-a4e18d29771c> /usr/lib/system/libsystem_kernel.dylib
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: 1
thread_create: 0
thread_set_state: 10
VM Region Summary:
ReadOnly portion of Libraries: Total=958.6M resident=0K(0%) swapped_out_or_unallocated=958.6M(100%)
Writable regions: Total=143.2M written=288K(0%) resident=288K(0%) swapped_out=0K(0%) unallocated=142.9M(100%)
VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 256K 1
ColorSync 48K 2
Kernel Alloc Once 32K 1
MALLOC 128.8M 22
MALLOC guard page 32K 2
STACK GUARD 56.2M 11
Stack 13.3M 11
VM_ALLOCATE 528K 2
__AUTH 1229K 170
__AUTH_CONST 19.2M 381
__CTF 824 1
__DATA 5302K 342
__DATA_CONST 16.8M 388
__DATA_DIRTY 1392K 317
__FONT_DATA 2352 1
__LINKEDIT 607.0M 6
__OBJC_RO 77.9M 1
__OBJC_RW 2559K 1
__TEXT 351.6M 399
__TPRO_CONST 128K 2
dyld private memory 160K 2
mapped file 1520K 44
page table in kernel 288K 1
shared memory 96K 4
=========== ======= =======
TOTAL 1.3G 2112
-----------
Full Report
-----------
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{
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"procRole" : "Unspecified",
"version" : 2,
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"modelCode" : "Mac14,12",
"coalitionID" : 1414,
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"build" : "25A5306g",
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"captureTime" : "2025-07-16 14:54:22.1976 +0200",
"codeSigningMonitor" : 2,
"incident" : "F40E7361-0CB6-4F4E-9ACF-00AED183981F",
"pid" : 31541,
"translated" : false,
"cpuType" : "ARM-64",
"roots_installed" : 0,
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"procLaunch" : "2025-07-16 14:54:22.1514 +0200",
"procStartAbsTime" : 599232818945,
"procExitAbsTime" : 599233916856,
"procName" : "ld",
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"parentPid" : 30067,
"coalitionName" : "com.googlecode.iterm2",
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"responsiblePid" : 30060,
"responsibleProc" : "iTerm2",
"codeSigningID" : "com.apple.ld",
"codeSigningTeamID" : "",
"codeSigningFlags" : 570442241,
"codeSigningValidationCategory" : 1,
"codeSigningTrustLevel" : 4294967295,
"codeSigningAuxiliaryInfo" : 0,
"instructionByteStream" : {"beforePC":"\/w9f1ugDBKr0V7+ptAAA0JSOJ5HVVDWQteIRkbQGAPmoHgD59FfBqA==","atPC":"IAAg1Kj8\/1QfAQDxyF82sAjRJJEIAUC5AAlCeuknnxoqAIBSPwEAcQ=="},
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"wakeTime" : 934,
"sleepWakeUUID" : "46EF3502-7525-4BE7-9FED-D47EEE14A9B7",
"sip" : "enabled",
"exception" : {"codes":"0x0000000000000001, 0x000000019ed665b8","rawCodes":[1,6959818168],"type":"EXC_BREAKPOINT","signal":"SIGTRAP"},
"termination" : {"flags":0,"code":5,"namespace":"SIGNAL","indicator":"Trace\/BPT trap: 5","byProc":"exc handler","byPid":31541},
"os_fault" : {"process":"ld"},
"asi" : {"libsystem_malloc.dylib":["BUG IN CLIENT OF LIBMALLOC: memory corruption of free block","Abort Cause 38705562912"]},
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"faultingThread" : 0,
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