So, after experiencing unexpected segfaults in one of my projects, I made a new one.
dub init crashtest
Then, I wrote this:
import std.stdio;
class testing
{
void init()
{}
}
void main()
{
testing one;
one.init();
writeln("Edit source/app.d to start your project.");
}
The segfault seems to originate at one.init(). Basically, calling class functions triggers it. But why?
I spent a few minutes adding `writefln("test"); throughout the program. It that the code never reaches the init function. No code inside init() will be executed.
As I was on OS X, I checked the crash report:
Process: crashtest [40968]
Path: /Users/USER/Desktop/*/crashtest
Identifier: crashtest
Version: 0
Code Type: X86-64 (Native)
Parent Process: dub [40962]
Responsible: Terminal [40321]
User ID: 502
Date/Time: 2016-03-23 20:46:35.822 +0800
OS Version: Mac OS X 10.11.2 (15C50)
Report Version: 11
Anonymous UUID: F5455E23-366C-B9FD-16B2-B02588FCBE4A
Sleep/Wake UUID: FA8990E8-D5F1-423E-A600-67148EB87B24
Time Awake Since Boot: 120000 seconds
Time Since Wake: 3600 seconds
System Integrity Protection: disabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
VM Regions Near 0:
-->
__TEXT 000000010b26e000-000000010b29b000 [ 180K] r-x/rwx SM=COW /Users/USER/Desktop/*
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 crashtest 0x000000010b26ed11 _Dmain + 17 (app.d:11)
1 crashtest 0x000000010b284684 D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv + 40
2 crashtest 0x000000010b2845c9 D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ7tryExecMFMDFZvZv + 45
3 crashtest 0x000000010b284629 D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZv + 45
4 crashtest 0x000000010b2845c9 D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ7tryExecMFMDFZvZv + 45
5 crashtest 0x000000010b28453f _d_run_main + 499
6 crashtest 0x000000010b26edea main + 34
7 libdyld.dylib 0x00007fff90e8e5ad start + 1
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x00007fff54991ab0 rcx: 0x00007fff8e373446 rdx: 0x00007fff549919d8
rdi: 0x0000000000000000 rsi: 0x00007fff549919d8 rbp: 0x00007fff54991880 rsp: 0x00007fff54991870
r8: 0x0000000000000008 r9: 0x0000000000000000 r10: 0x00007fff8e373446 r11: 0x0000000000000206
r12: 0x00007fff54991a08 r13: 0x00007fff549919f3 r14: 0x0000000000000001 r15: 0x00007fff54991a08
rip: 0x000000010b26ed11 rfl: 0x0000000000010246 cr2: 0x0000000000000000
Logical CPU: 2
Error Code: 0x00000004
Trap Number: 14
Binary Images:
0x10b26e000 - 0x10b29afff +crashtest (0) <A987930C-05C4-369D-8DDB-823C515D9BF4> /Users/USER/Desktop/*/crashtest
0x7fff65b6e000 - 0x7fff65ba4fa7 dyld (360.18) <1A7F8274-FC32-3B86-9979-66B8F2B7B5E2> /usr/lib/dyld
0x7fff86f6f000 - 0x7fff86f70fff libsystem_blocks.dylib (65) <49D42329-7DE9-3413-92C3-A473A7E9CF35> /usr/lib/system/libsystem_blocks.dylib
0x7fff8881e000 - 0x7fff88826fe7 libsystem_platform.dylib (74.10.3) <D3A27E10-7F08-3603-ACC8-7A92B2C04BAB> /usr/lib/system/libsystem_platform.dylib
0x7fff89e22000 - 0x7fff89e22ff7 liblaunch.dylib (756.20.4) <EDF719D6-D2BB-38DD-8C94-4272BEFDA2CD> /usr/lib/system/liblaunch.dylib
0x7fff8bcee000 - 0x7fff8bcf7ff7 libsystem_pthread.dylib (138.10.4) <327CECD0-B881-3153-8FCC-4FD4818B7F16> /usr/lib/system/libsystem_pthread.dylib
0x7fff8be5e000 - 0x7fff8be5eff7 libunc.dylib (29) <1D0F8265-F026-3CBD-93D3-F8DF14FFCE68> /usr/lib/system/libunc.dylib
0x7fff8c266000 - 0x7fff8c267fff libDiagnosticMessagesClient.dylib (100) <4243B6B4-21E9-355B-9C5A-95A216233B96> /usr/lib/libDiagnosticMessagesClient.dylib
0x7fff8c487000 - 0x7fff8c7f2657 libobjc.A.dylib (680) <58CB8CFC-7DBD-3A53-BD72-A42FF799B21E> /usr/lib/libobjc.A.dylib
0x7fff8cff1000 - 0x7fff8d01afff libc++abi.dylib (125) <DCCC8177-3D09-35BC-9784-2A04FEC4C71B> /usr/lib/libc++abi.dylib
0x7fff8d649000 - 0x7fff8d649ff7 libkeymgr.dylib (28) <09397E01-6066-3179-A50C-2CE666FDA929> /usr/lib/system/libkeymgr.dylib
0x7fff8d64a000 - 0x7fff8d651ff7 libcompiler_rt.dylib (62) <D3C4AB40-23B4-3BC6-8C38-5B8758D14E80> /usr/lib/system/libcompiler_rt.dylib
0x7fff8e35c000 - 0x7fff8e37afff libsystem_kernel.dylib (3248.20.55) <0E688457-4915-36DD-8798-5C2EDEE3F1A3> /usr/lib/system/libsystem_kernel.dylib
0x7fff8eab9000 - 0x7fff8eae2fff libsystem_info.dylib (477.20.1) <6513635B-4ADE-3B45-BF63-ED7AC565B0C9> /usr/lib/system/libsystem_info.dylib
0x7fff9023d000 - 0x7fff90242ff7 libmacho.dylib (875.1) <CB745E1F-4885-3F96-B38B-2093DF488FD5> /usr/lib/system/libmacho.dylib
0x7fff90801000 - 0x7fff9080aff3 libsystem_notify.dylib (150.20.3) <243FADE1-255A-3B78-8033-F336CD64B817> /usr/lib/system/libsystem_notify.dylib
0x7fff90e8b000 - 0x7fff90e8effb libdyld.dylib (360.18) <5F3777A7-F07E-3D5F-BFA3-A920FF4170ED> /usr/lib/system/libdyld.dylib
0x7fff911fb000 - 0x7fff91203ffb libsystem_dnssd.dylib (625.20.4) <945B5FB1-DA91-3D45-A961-A8FAD53C1E7E> /usr/lib/system/libsystem_dnssd.dylib
0x7fff916e5000 - 0x7fff916edfff libsystem_networkextension.dylib (385.20.6) <DC8A102A-BF02-31A4-8914-65C34DF6B592> /usr/lib/system/libsystem_networkextension.dylib
0x7fff9213a000 - 0x7fff92167fff libdispatch.dylib (501.20.1) <324C9189-2AF3-3356-847F-6F4CE1C6E901> /usr/lib/system/libdispatch.dylib
0x7fff922e8000 - 0x7fff922eaff7 libsystem_configuration.dylib (802.20.7) <5FD79070-36CC-3D02-BEA7-BB5D2AE97D5D> /usr/lib/system/libsystem_configuration.dylib
0x7fff923d9000 - 0x7fff923eaff7 libsystem_trace.dylib (201.10.3) <F0B7622B-FB6B-31E1-8703-38F57BE84553> /usr/lib/system/libsystem_trace.dylib
0x7fff929db000 - 0x7fff929dcffb libremovefile.dylib (41) <B8D1A5FC-CFD5-3AAB-8A10-14DDC129710A> /usr/lib/system/libremovefile.dylib
0x7fff92b8e000 - 0x7fff92b8ffff libsystem_secinit.dylib (20) <FD6ECF2C-1489-32CA-981B-9045B5EB1FAA> /usr/lib/system/libsystem_secinit.dylib
0x7fff95027000 - 0x7fff9502bfff libcache.dylib (75) <6B245C0A-F3EA-383B-A542-5B0D0456A41B> /usr/lib/system/libcache.dylib
0x7fff95919000 - 0x7fff95990fe7 libcorecrypto.dylib (335.20.1) <C6BD205F-4ECE-37EE-BCAB-A76F39CDCFFA> /usr/lib/system/libcorecrypto.dylib
0x7fff95b1b000 - 0x7fff95b32fff libsystem_asl.dylib (322) <3C2D3ACD-0DD1-337A-8247-44A910D67A65> /usr/lib/system/libsystem_asl.dylib
0x7fff95f3c000 - 0x7fff95f52ff7 libsystem_coretls.dylib (83.20.8) <30AF7134-6CA7-3582-B9D3-507D6ED19A88> /usr/lib/system/libsystem_coretls.dylib
0x7fff97311000 - 0x7fff97314ff7 libsystem_sandbox.dylib (460.20.9) <1C891336-1B25-365D-B43E-96D5B3BE66B0> /usr/lib/system/libsystem_sandbox.dylib
0x7fff977ab000 - 0x7fff977c7ff7 libsystem_malloc.dylib (67) <9EECAB18-F025-34C4-8E32-7EFFA6720EFC> /usr/lib/system/libsystem_malloc.dylib
0x7fff98144000 - 0x7fff981a5ff7 libsystem_network.dylib (583.20.10) <1C0410F3-F66E-3B0D-B8AD-0D49AB15A529> /usr/lib/system/libsystem_network.dylib
0x7fff99376000 - 0x7fff99377ffb libSystem.B.dylib (1226.10.1) <54388DF0-3813-33E4-BE8D-7743A81ACF4D> /usr/lib/libSystem.B.dylib
0x7fff9956c000 - 0x7fff9956eff7 libquarantine.dylib (80) <163CF63A-7455-3D1F-AE57-8C4475A9204C> /usr/lib/system/libquarantine.dylib
0x7fff9a7c9000 - 0x7fff9a7f2fff libxpc.dylib (756.20.4) <61AB4610-9304-354C-9E9B-D57198AE9866> /usr/lib/system/libxpc.dylib
0x7fff9ace5000 - 0x7fff9acedfff libcopyfile.dylib (127) <F5133269-0B22-388C-A57C-079667B6291E> /usr/lib/system/libcopyfile.dylib
0x7fff9bae8000 - 0x7fff9bb2eff7 libauto.dylib (186) <999E610F-41FC-32A3-ADCA-5EC049B65DFB> /usr/lib/libauto.dylib
0x7fff9bc62000 - 0x7fff9bc6dff7 libcommonCrypto.dylib (60075.20.1) <766BC3F5-41F3-3315-BABC-72718A98EA92> /usr/lib/system/libcommonCrypto.dylib
0x7fff9bf1e000 - 0x7fff9bfabfff libsystem_c.dylib (1082.20.4) <EAB38A6C-8671-3B13-B500-90EC1B912063> /usr/lib/system/libsystem_c.dylib
0x7fff9cabd000 - 0x7fff9caecffb libsystem_m.dylib (3105) <26655445-CA97-321E-B221-801CB378D1AA> /usr/lib/system/libsystem_m.dylib
0x7fff9caf0000 - 0x7fff9caf2fff libsystem_coreservices.dylib (19.2) <1B3F5AFC-FFCD-3ECB-8B9A-5538366FB20D> /usr/lib/system/libsystem_coreservices.dylib
0x7fff9d1e9000 - 0x7fff9d1eeff3 libunwind.dylib (35.3) <124E0F05-2350-3774-A32C-7F5BF38EDE73> /usr/lib/system/libunwind.dylib
0x7fff9d234000 - 0x7fff9d287ff7 libc++.1.dylib (120.1) <8FC3D139-8055-3498-9AC5-6467CB7F4D14> /usr/lib/libc++.1.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: 95315
thread_create: 0
thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=99.2M resident=0K(0%) swapped_out_or_unallocated=99.2M(100%)
Writable regions: Total=20.4M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=20.4M(100%)
VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 2048K 2
Kernel Alloc Once 4K 2
MALLOC 9396K 8
MALLOC guard page 16K 4
STACK GUARD 56.0M 2
Stack 8192K 2
VM_ALLOCATE 1028K 3
__DATA 1516K 42
__LINKEDIT 91.5M 4
__TEXT 7836K 43
shared memory 8K 3
=========== ======= =======
TOTAL 176.8M 104
Model: MacBookAir5,2, BootROM MBA51.00EF.B04, 2 processors, Intel Core i5, 1.8 GHz, 4 GB, SMC 2.5f7
Graphics: Intel HD Graphics 4000, Intel HD Graphics 4000, Built-In
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1600 MHz, 0x802C, 0x384B54463235363634485A2D3147364D3120
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1600 MHz, 0x802C, 0x384B54463235363634485A2D3147364D3120
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xE9), Broadcom BCM43xx 1.0 (7.21.94.136.1a1)
Bluetooth: Version 4.4.3f4 16616, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD SM256E, 251 GB
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: Hub
USB Device: Card Reader
USB Device: Apple Internal Keyboard / Trackpad
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: FaceTime HD Camera (Built-in)
USB Device: USB 3.0 Bus
Thunderbolt Bus: MacBook Air, Apple Inc., 23.4
So why is this happening? EXC_BAD_ACCESS is being reported, but it seems to be something about corrupted pointers. I don't understand how that could be.
Replace the line
testing one;
by:
testing one = new testing();
That should get you going