What's going on?

[ghost]

$ pacman -Syu
:: Synchronizing package databases...
 mingw64 is up to date
 clang64 is up to date
 msys is up to date
:: Starting core system upgrade...
warning: terminate other MSYS2 programs before proceeding
resolving dependencies...
looking for conflicting packages...

Packages (3) msys2-runtime-3.5.3-1  msys2-runtime-devel-3.5.3-1  pacman-6.0.2-15

Total Download Size:    8.54 MiB
Total Installed Size:  50.40 MiB
Net Upgrade Size:       0.35 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages...
 msys2-runtime-devel-3.5.3-1-x86_64                                                336.0 KiB   116 KiB/s 00:03 [#################################################################] 100%
 pacman-6.0.2-15-x86_64                                                              6.4 MiB  1347 KiB/s 00:05 [#################################################################] 100%
 msys2-runtime-3.5.3-1-x86_64                                                     1868.7 KiB   356 KiB/s 00:05 [#################################################################] 100%
 Total (3/3)                                                                         8.5 MiB  1559 KiB/s 00:06 [#################################################################] 100%
(3/3) checking keys in keyring                                                                                 [#################################################################] 100%
(3/3) checking package integrity                                                                               [#################################################################] 100%
(3/3) loading package files                                                                                    [#################################################################] 100%
(3/3) checking for file conflicts                                                                              [#################################################################] 100%
(3/3) checking available disk space                                                                            [#################################################################] 100%
:: Processing package changes...
(1/3) upgrading msys2-runtime                                                                                  [#################################################################] 100%
      0 [main] pacman (2420) shared_info::initialize: size of shared memory region changed from 58296 to 57272
                                                                                                                    0 [main] pacman 46 dofork: child -1 - forked process 2420 died unexpectedly, retry 0, exit code 0xC0000142, errno 11
                                                error: could not fork a new process (Resource temporarily unavailable)
(2/3) upgrading msys2-runtime-devel                                                                            [#################################################################] 100%
(3/3) upgrading pacman                                                                                         [#################################################################] 100%
:: To complete this update all MSYS2 processes including this terminal will be closed. Confirm to proceed [Y/n]

After I proceed to close the shell and reopen it to run pacman -Syu again, everything seems to be normal. I'm using Windows 8.1 64 bit.

[lazka]

I guess the new install script gets executed after update, which forks, which doesn't work.

Nothing to worry about but can be improved