"Richard Purdie" <[email protected]> writes:
> On Mon, 2023-12-18 at 10:07 -0800, Khem Raj wrote: >> On Mon, Dec 18, 2023 at 9:58 AM Richard Purdie >> <[email protected]> wrote: >> > >> > On Mon, 2023-12-18 at 09:45 -0800, Khem Raj wrote: >> > > I tried the two patches in this series. It did improve the situation >> > > but I am still getting SSH timeouts. But this time its 13 tests >> > > earlier it used to be 40+ >> > > btw. my images are using systemd. So it might be good to see if we see >> > > this with poky-altcfg as well or not. >> > >> > Do you have the log.do_testimage and the ${WORKDIR}/testimage/ files? >> >> yes, further I ran the failing tests in loop one after another still >> one test gzip fails with ssh timeouts >> >> https://busybox.net/~kraj/log.do_testimage.503 >> https://busybox.net/~kraj/testimage/ >> >> there are two runs in the testimages folder. In one you see the RCU >> stall and in second you do not >> but it fails with same ssh timeout issue. >> >> > >> > Did you still see rcu stalls in the logs? > > What is interesting is there is ~3MB of nulls in the .2 serial log. The > rcu stall is also: > > [ 88.261687] serial8250_tx_chars+0xea/0x2b0 > [ 88.261689] serial8250_handle_irq+0x1e9/0x330 > [ 88.261691] serial8250_default_handle_irq+0x4a/0x90 > [ 88.261693] serial8250_interrupt+0x66/0xc0 > [ 88.261696] __handle_irq_event_percpu+0x54/0x1c0 > [ 88.261701] handle_irq_event+0x3d/0x80 > > i.e. it is stalled in the serial TX path. > > The big question is why is there so many nulls on the serial port. I > see a few on my local x86 test runs but only ~4kb, not megabytes of > them. I hadn't worked out where/what they are from yet. > > I suspect something in the serial/kernel/qemu space isn't interacting > correctly. We generally don't model FIFOs in QEMU and also we will block the main thread if we can't write data out. > > Find the cause of the nulls and we might make progress on this. > > Cheers, > > Richard > > > > -- Alex Bennée Virtualisation Tech Lead @ Linaro
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