BUG #16827: macOS interrupted syscall leads to a crash

The following bug has been logged on the website:

Bug reference:      16827
Logged by:          Ricardo Ungureanu
Email address:      ricardoungureanu@gmail.com
PostgreSQL version: 13.1
Operating system:   macOS 11.0
Description:

Hello,

I am using macOS 11.0 and trying to import a large dump into postgresql.
Under some circumstances, it crashes while importing. 
I inspected the logs and found out a system call is interrupted (" LOG:
could not open file "pg_wal": Interrupted system call"). Apple has added a
new feature in macOS 11.0 to audit security events. I noticed that the
kernel, while waiting on a condition variable, if it receives an interrupt,
will just pass EINTR (error code 4) back to the usermode program. Your
function XLogFileInit does not treat such cases (just ENOENT is checked) and
decides to exit with an abort(). I have attached below the crash file
generated. 

Please let me know if you need more details about this. The bug can be
easily replicated, but a fairly complicated setup has to be done beforehand
(large db dump, macOS 11.0, endpoint security events enabled).

Thanks,
Ricardo



```
Process:               postgres [52997]
Path:                  /Users/USER/*/postgres
Identifier:            postgres
Version:               ???
Code Type:             X86-64 (Native)
Parent Process:        postgres [82]
Responsible:           postgres [82]
User ID:               502

Date/Time:             2021-01-15 14:38:46.907 +0200
OS Version:            macOS 11.1 (20C69)
Report Version:        12
Anonymous UUID:        F608F4B3-1CFC-403F-896B-1127865BDCB5

Sleep/Wake UUID:       385F6270-DB7E-4813-B828-8E66FAEC4B7E

Time Awake Since Boot: 5900 seconds

System Integrity Protection: disabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
crashed on child side of fork pre-exec

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib            0x00007fff2030c462 __pthread_kill + 10
1   libsystem_pthread.dylib           0x00007fff2033a610 pthread_kill + 263
2   libsystem_c.dylib                 0x00007fff2028d720 abort + 120
3   postmaster                        0x000000010bd63987 errfinish.cold.2 +
39
4   postmaster                        0x000000010bc816b9 errfinish + 809
(elog.c:590)
5   postmaster                        0x000000010bce1981 XLogFileInit.cold.7 +
65
6   postmaster                        0x000000010b9100d1 XLogFileInit + 1073
(xlog.c:3275)
7   postmaster                        0x000000010b90f048 XLogWrite + 328
(xlog.c:2487)
8   postmaster                        0x000000010b90f6f1 XLogBackgroundFlush +
513 (xlog.c:3137)
9   postmaster                        0x000000010baf5438 WalWriterMain + 584
(walwriter.c:241)
10  postmaster                        0x000000010b924a7e AuxiliaryProcessMain +
1022 (bootstrap.c:459)
11  postmaster                        0x000000010baf0410 StartChildProcess +
560 (postmaster.c:5512)
12  postmaster                        0x000000010baefce6 reaper + 1510
(postmaster.c:3043)
13  libsystem_platform.dylib          0x00007fff2037ed7d _sigtramp + 29
14  libcrypto.1.1.dylib               0x000000010c41f641
evp_EncryptDecryptUpdate + 497
15  postmaster                        0x000000010baee52d PostmasterMain + 3725
(postmaster.c:1412)
16  postmaster                        0x000000010ba593a0 main + 784
(main.c:210)
17  libdyld.dylib                     0x00007fff20355621 start + 1

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x000000010df2be00  rcx: 0x00007ffee436dc48
rdx: 0x0000000000000000
  rdi: 0x0000000000000303  rsi: 0x0000000000000006  rbp: 0x00007ffee436dc70
rsp: 0x00007ffee436dc48
   r8: 0x00000000000130a8   r9: 0x00007fff8899a0e8  r10: 0x000000010df2be00
r11: 0x0000000000000246
  r12: 0x0000000000000303  r13: 0x0000000000000000  r14: 0x0000000000000006
r15: 0x0000000000000016
  rip: 0x00007fff2030c462  rfl: 0x0000000000000246  cr2:
0x000000010bd63960
  
Logical CPU:     0
Error Code:      0x02000148
Trap Number:     133

Thread 0 instruction stream not available.

Thread 0 last branch register state not available.


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com.apple.coreservices.BackgroundTaskManagement (1.0 - 104)
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com.apple.MetalPerformanceShaders.MPSNeuralNetwork (1.0 - 1)
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com.apple.MetalPerformanceShaders.MPSRayIntersector (1.0 - 1)
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com.apple.MetalPerformanceShaders.MPSMatrix (1.0 - 1)
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com.apple.MetalPerformanceShaders.MPSNDArray (1.0 - 1)
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com.apple.MetalPerformanceShaders.MPSImage (1.0 - 1)
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/System/Library/PrivateFrameworks/AppleSauce.framework/Versions/A/AppleSauce
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com.apple.MetalPerformanceShaders.MetalPerformanceShaders (1.0 - 1)
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/System/Library/Frameworks/MetalPerformanceShaders.framework/Versions/A/MetalPerformanceShaders
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/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/DictionaryServices.framework/Versions/A/DictionaryServices
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    0x7fff2abd4000 -     0x7fff2accdfff  com.apple.APFS (1677.60.23 -
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/System/Library/PrivateFrameworks/APFS.framework/Versions/A/APFS
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<219319E1-BDBD-34D1-97B7-E46256785D3C>
/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
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    0x7fff2b678000 -     0x7fff2b738fff  com.apple.Heimdal (4.0 - 2.0)
<8BB18335-5DD3-3154-85C8-0145C64556A2>
/System/Library/PrivateFrameworks/Heimdal.framework/Versions/A/Heimdal
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<9957A6F4-8B66-3429-86CD-6DF4993EB6F5> /usr/lib/libresolv.9.dylib
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/System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
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<2A38D59F-5F3A-3779-A421-2F8128F22B95>
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/usr/lib/system/libsystem_product_info_filter.dylib
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/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
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/System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
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Accelerate 1.11) <F2FFCC7B-EE3D-3768-A73B-342851B53741>
/System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
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/System/Library/PrivateFrameworks/AppleSRP.framework/Versions/A/AppleSRP
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(1.3 - 1.3) <96849317-5346-3D5D-95B7-6C48C3015427>
/System/Library/PrivateFrameworks/CoreDaemon.framework/Versions/B/CoreDaemon
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194.5) <C3E9E36B-B981-3FAD-A8EA-9BADE5F2B30D>
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<1BD94BF6-8E63-3B21-95DC-E5EEEBFB8AE8>
/System/Library/Frameworks/Kerberos.framework/Versions/A/Libraries/libHeimdalProxy.dylib
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<4ECE128D-5E79-3ADF-8FE7-4FE8F565F8AA>
/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCoreFSCache.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 2
    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: 3225
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=618.6M resident=0K(0%)
swapped_out_or_unallocated=618.6M(100%)
Writable regions: Total=204.9M written=0K(0%) resident=0K(0%)
swapped_out=0K(0%) unallocated=204.9M(100%)
 
                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Kernel Alloc Once                    8K        1 
MALLOC                            54.2M       19 
MALLOC guard page                   16K        4 
STACK GUARD                       56.0M        1 
Stack                             8192K        1 
VM_ALLOCATE                      142.2M        5 
__DATA                            3517K      164 
__DATA_CONST                      6360K       97 
__DATA_DIRTY                       291K       60 
__LINKEDIT                       492.9M       10 
__OBJC_RO                         60.5M        1 
__OBJC_RW                         2452K        2 
__TEXT                           125.7M      163 
__UNICODE                          588K        1 
shared memory                        8K        2 
===========                     =======  ======= 
TOTAL                            952.6M      531 
```