Comment # 9 on bug 1156421 from Fabian Vogt

Created attachment 824579 [details]
strace of journald during systemd-journal-flush.service failing

I added an strace call to systemd-journal-flush.service and rebooted and
luckily it still broke. The issue seems to be that indeed /var is still
read-only:

writev(6, [{iov_base="<46>", iov_len=4}, {iov_base="systemd-journald",
iov_len=16}, {iov_base="[815]: ", iov_len=7}, {iov_base="Received client
request to flush"..., iov_len=49}, {iov_base="\n", iov_len=1}], 5) = 77
mkdirat(AT_FDCWD, "/var/log/journal/ec14ed36308c4af2b46995c50601f402", 0755) =
-1 EROFS (Read-only file system)
openat(AT_FDCWD,
"/var/log/journal/ec14ed36308c4af2b46995c50601f402/system.journal",
O_RDWR|O_CREAT|O_NONBLOCK|O_CLOEXEC, 0640) = -1 ENOENT (No such file or
directory)
openat(AT_FDCWD, "/run/log/journal/ec14ed36308c4af2b46995c50601f402",
O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 24