Let's CC netdev and linux-pm since this is obviously a suspend issue, and may have something to do with ethtool. On Sun, Jun 12, 2011 at 04:11:43PM -0700, Andy Isaacson wrote: > On Sun, Jun 12, 2011 at 12:58:56PM -0700, Andy Isaacson wrote: > > My Thinkpad x201s threw some errors (?) a few minutes after resuming > > from suspend-to-ram this morning. > > > > [56415.672140] INFO: rcu_sched_state detected stall on CPU 0 (t=15000 jiffies) > > > > Nothing jumps out of the backtraces at me. Full dmesg and config > > attached. This was my first StR since upgrading from 2.6.39, let's see > > if it fails again when I suspend after sending this email. :) > > I haven't had a fully successful StR cycle yet (in 5 tries), although I > can't pin them all on RCU. On try 2 it hung completely about 10 seconds > after I unlocked the screensaver, on try 3 it came back to a black > console, and on try 4 it didn't suspend at all (blinking moon LED but > battery LED and CPU fan still on). Of course now that I'm trying to debug, I am seeing many successful suspend-resume cycles. I don't see any signs of difference between the cases that hung and the cases that are now succeeding. CCing netdev, because I suspend by running pm-suspend, and in at least one failure, an ethtool running under pm-suspend seemed to be the problem: root 11558 pts/8 S+ \_ /bin/sh /usr/lib/pm-utils/sleep.d/00powers root 11559 pts/8 S+ \_ /bin/sh /usr/sbin/pm-powersave root 11576 pts/8 S+ \_ /bin/sh /usr/lib/pm-utils/power.d/ root 11577 pts/8 D+ \_ ethtool -s eth0 wol g many processes were stuck in D: USER PID VSZ RSS STAT START COMMAND root 11493 0 0 D 16:11 \_ [kworker/u:15] nobody 1707 21472 992 D 14:31 dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override adi 11606 41004 2424 D+ 16:13 | \_ ssh hex root 11577 4092 324 D+ 16:11 | \_ ethtool -s eth0 wol g root 11595 22108 892 D+ 16:12 | \_ sudo cat /proc/11577/stack root 11604 22108 900 D+ 16:13 | \_ sudo cat /proc/11577/stack ==> /proc/11577/wchan <== synchronize_sched -andy
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