Red Hat Bugzilla – Bug 155074
hotplug gets stuck.
Last modified: 2015-01-04 17:18:58 EST
I did an upgrade of an FC3 to rawhide, and on logging in, found that everything was really sluggish. Firing up top showed that the CPUs were both at 100% ! These two.. 3811 root 20 -5 5268 404 328 R 92.3 0.0 24:03.47 05-pam_console. 3997 root 20 -5 5268 404 328 R 90.6 0.0 23:19.10 default.hotplug Take it in turns to be scheduled, and do.. bugger all. strace of those processes shows no output whatsoever. sysrq-t shows.. 05-pam_consol R running task 0 3811 7552 (NOTLB) bash S ffff81002e4e0170 0 7571 4634 7620 7768 7449 (NOTLB) ffff81006fea3eb8 0000000000000086 ffff81002e4e0170 0000000000000002 ffffffff80543720 0000000000000239 00000074000001e3 ffff81002e4e0380 ffff81002e4e0170 ffff81002e1770f0 Call Trace:<ffffffff8013d51e>{do_wait+2798} <ffffffff80134440>{default_wake_function+0} <ffffffff8019d59c>{sys_ioctl+108} <ffffffff8010ea72>{system_call+126} default.hotpl R running task 0 3997 7674 (NOTLB) bash S ffff81002d6ad880 0 7768 4634 7813 7571 (NOTLB) ffff81002de2beb8 0000000000000082 ffff81002d6ad880 0000000000000002 ffffffff80543720 00000000000000f3 00000074000001e3 ffff81002d6ada90 ffff81002d6ad880 ffff8100302a00f0 Call Trace:<ffffffff8013d51e>{do_wait+2798} <ffffffff80134440>{default_wake_function+0} <ffffffff8019d59c>{sys_ioctl+108} <ffffffff8010ea72>{system_call+126} What they're waiting for is a mystery to me. more oddness.. something is calling sys_swapon once a second. in 30 mins of uptime, its been called over 10,000 times.
killing these processes brings back a speedy desktop. The calls to swapon still occur though. Wieeeerd.
false alarm on the sys_swapon -- wrong System.map in use. (its slab debug :-) Why hotplug went nuts is still a mystery though.
I'd love to know what that ioctl was..... if you can reproduce it, what files do they have open?
You still seeing this? (Woo, I get to do this this time. :) )
nope, only ever happened once. *shrug* rawhide oddness of the day I suppose.