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Quoting https://github.com/systemd/systemd/issues/14828#issuecomment-635212615: > [kernel uses] msleep_interruptible() and that means when the process receives > any kind of signal masked or not this will abort with EINTR. systemd-logind > gets signals from the TTY layer all the time though. > Here's what might be happening: while logind reads the EFI stuff it gets a > series of signals from the TTY layer, which causes the read() to be aborted > with EINTR, which means logind will wait 50ms and retry. Which will be > aborted again, and so on, until quite some time passed. If we'd not wait for > the 50ms otoh we wouldn't wait so long, as then on each signal we'd > immediately retry again.
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