On Wed, Sep 21, 2022 at 08:02:50PM +0900, Chan Kim wrote:
> Hello kernel experts and users,
>
> I'm trying to boot linux-5.10.0-rc5 on our arm64 board (using neoverse-v1
> core).
5.10-rc5 is very very very old and obsolete, and not even a real
release. Why are you using that specific kernel version?
At the very least, use a released and supported 5.10.y tree, but even
better, use the latest 5.19.y release.
> After the shell comes up, when I press enter key at the prompt, it gives me
> another prompt.
> But when I press enter key again, it stops responding.
> After inspecting where the program hangs, I found it hangs in function
> tty_set_termios while downing the rwsem.
> Please see below where I marked "<===== this line "". (in file
> drivers/tty/tty_ioctl.c)
>
> int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
> {
> struct ktermios old_termios;
> struct tty_ldisc *ld;
>
> WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY &&
> tty->driver->subtype == PTY_TYPE_MASTER);
> /*
> * Perform the actual termios internal changes under lock.
> */
>
>
> /* FIXME: we need to decide on some locking/ordering semantics
> for the set_termios notification eventually */
> down_write(&tty->termios_rwsem); <====== this
> line
What serial driver are you using that is causing this problem?
thanks,
greg k-h
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