Messages in this thread | | | From | Linus Torvalds <> | Date | Thu, 20 Jan 2011 13:12:52 -0800 | Subject | Re: [GIT] Networking |
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On Wed, Jan 19, 2011 at 6:04 PM, David Miller <davem@davemloft.net> wrote: > > 1) Revert a netlink flag sanity check that is causing regressions in > existing applications. ...
This is a long-shot, but I thought I'd ask before I start trying to bisect the fourth independent suspend/resume related issue in this merge window..
When I suspend/resume while logged in by closing the lid on my laptop on FC14, it causes the gnome-screensaver-dialog to start up. So far so fine, that's what I want, and it all works fin in 2.6.37.
But in current -git (and in -rc8, so it's not changed by your latest pull request), gnome-screensaver-dialog gets stuck after I type in my password, making the box basically useless.
So I straced it over the network, and if I attach _when_ it is already stuck, it immediately becomes unstuck. But if I attach to it before typing my password, I can see the hang in strace, and it looks like this:
... read(3, 0x9806500, 4096) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=12, events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=9, events=POLLIN|POLLPRI}, {fd=10, events=POLLIN|POLLPRI}, {fd=15, events=POLLIN}, {fd=16, events=POLLIN}, {fd=17, events=0}, {fd=19, events=POLLIN}], 10, -1) = ? ERESTART_RESTARTBLOCK (To be restarted) restart_syscall(
and that's it - it's now hung. So why did it work when I straced it while hung? And why is it doing that ERESTART_RESTARTBLOCK in the first place, I'm not seeing any signals there?
So I tried sending it a useless signal, which will re-animate the strace, and now I get:
restart_syscall(<... resuming interrupted call ...>) = 1 --- SIGWINCH (Window changed) @ 0 (0) --- poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
Whee. That signal got it started again, and the poll finished immediately.
And how/why did the input to the poll apparently change? That looks suspicious too. Might be some odd strace artifact, but whatever.
So I'm contacting you because that fd=3 is a socket (I didn't check details), and because anything I find in the git logs that discusses "poll" seems to be network-related. So I'm wondering it this rings any bells, because bisecting this is going to be painful as hell (since I have to carefully work around all the _other_ problems I've bisected on that machine while doing so).
Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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