Please, try this patch maybe it can help localize your problem.
drivers/tty/n_tty.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 05e72be..28f15d0 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -230,6 +230,7 @@ static void reset_buffer_flags(struct tty_struct *tty)
ldata->canon_head = ldata->canon_data = ldata->erasing = 0;
bitmap_zero(ldata->read_flags, N_TTY_BUF_SIZE);
n_tty_set_room(tty);
+ check_unthrottle(tty);
}
/**
--
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