Ah, right, I forgot – since this is done in the service child (right before exec) and not in the main process, you probably need to add the -f option to make strace follow forks...
On Thu, Mar 3, 2022, 22:08 Christopher Obbard <chris.obbard@xxxxxxxxxxxxx> wrote:
Hi Mantas,
On 03/03/2022 19:18, Mantas Mikulėnas wrote:
> On Thu, Mar 3, 2022 at 9:09 PM Christopher Obbard
> <chris.obbard@xxxxxxxxxxxxx <mailto:chris.obbard@xxxxxxxxxxxxx>> wrote:
>
> Hi systemd experts!
>
> I am using systemd-247 and systemd-250 on debian system, which is
> running a minimal downstream 5.4 kernel for a Qualcomm board.
>
> systemd 241 in debian buster works fine, but systemd 247 (debian
> bullseye) and systemd 250 (debian unstable) seem to get upset about
> file
> descriptors on services. These errors are consistant and the board
> boots
> just fine with init=/bin/sh
>
> I've got the required kernel config from README in my kernel, I am
> using
> a heavily patched downstream kernel, but from the following log can you
> suggest anything I can do to debug this (other than throwing the board
> out of the window) ?
>
>
> From the message, it looks like the error is returned by
> close_all_fds() in src/basic/fd-util.c, where the only major change is
> that it has been ported to call close_range() if that's available...
>
> I would boot with init=/bin/sh, then run `exec strace -D -o
> /var/log/systemd.trace /lib/systemd/systemd` to get a trace, and see if
> the EINVAL actually comes from calling close_range() or from something else.
>
> --
> Mantas Mikulėnas
Thanks for your reply. It reproduced nicely with the command you gave.
Seems like nothing related to close_range returning EINVAL, only the
following calls returned EINVAL:
cat systemd-failing.trace | grep EINVAL
prctl(PR_CAPBSET_READ, 0x30 /* CAP_??? */) = -1 EINVAL (Invalid argument)
prctl(PR_CAPBSET_READ, CAP_CHECKPOINT_RESTORE) = -1 EINVAL (Invalid
argument)
prctl(PR_CAPBSET_READ, CAP_PERFMON) = -1 EINVAL (Invalid argument)
read(4, 0x55675a75b0, 4095) = -1 EINVAL (Invalid argument)
mount("cgroup2", "/proc/self/fd/4", "cgroup2",
MS_NOSUID|MS_NODEV|MS_NOEXEC, "nsdelegate,memory_recursiveprot") = -1
EINVAL (Invalid argument)
I have attached the full strace output, in case that would be useful?
Thanks
Chris
