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Atomic test-and-set instruction does not work on qemu-user
I try to compile and run PostgreSQL/Greenplum database inside docker container/qemu-aarch64-static:
```
host: CentOS7 x86_64
container: centos:centos7.9.2009 --platform linux/arm64/v8
qemu-user-static: https://github.com/multiarch/qemu-user-static/releases/
```
However, GP/PG's spinlock always gets stuck and reports PANIC errors. It seems its spinlock
has something wrong.
```
https://github.com/greenplum-db/gpdb/blob/master/src/include/storage/s_lock.h
https://github.com/greenplum-db/gpdb/blob/master/src/backend/storage/lmgr/s_lock.c
```
So I extract its spinlock implementation into one test C source file (see attachment file),
and get reprodcued:
```
$ gcc spinlock_qemu.c
$ ./a.out
C -- slock inited, lock value is: 0
parent 139642, child 139645
P -- slock lock before, lock value is: 0
P -- slock locked, lock value is: 1
P -- slock unlock after, lock value is: 0
C -- slock lock before, lock value is: 1
P -- slock lock before, lock value is: 1
C -- slock locked, lock value is: 1
C -- slock unlock after, lock value is: 0
C -- slock lock before, lock value is: 1
P -- slock locked, lock value is: 1
P -- slock unlock after, lock value is: 0
P -- slock lock before, lock value is: 1
C -- slock locked, lock value is: 1
C -- slock unlock after, lock value is: 0
P -- slock locked, lock value is: 1
C -- slock lock before, lock value is: 1
P -- slock unlock after, lock value is: 0
C -- slock locked, lock value is: 1
P -- slock lock before, lock value is: 1
C -- slock unlock after, lock value is: 0
P -- slock locked, lock value is: 1
C -- slock lock before, lock value is: 1
P -- slock unlock after, lock value is: 0
C -- slock locked, lock value is: 1
P -- slock lock before, lock value is: 1
C -- slock unlock after, lock value is: 0
P -- slock locked, lock value is: 1
C -- slock lock before, lock value is: 1
P -- slock unlock after, lock value is: 0
P -- slock lock before, lock value is: 1
spin timeout, lock value is 1 (pid 139642)
spin timeout, lock value is 1 (pid 139645)
spin timeout, lock value is 1 (pid 139645)
spin timeout, lock value is 1 (pid 139642)
spin timeout, lock value is 1 (pid 139645)
spin timeout, lock value is 1 (pid 139642)
...
...
...
```
NOTE: this code always works on PHYSICAL ARM64 server.
|