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(at)gmail(dot)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.

Binary Images:
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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
```