Bug 155074 - hotplug gets stuck.
Summary: hotplug gets stuck.
Alias: None
Product: Fedora
Classification: Fedora
Component: hotplug
Version: 4
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Bill Nottingham
QA Contact: Brock Organ
Depends On:
TreeView+ depends on / blocked
Reported: 2005-04-15 23:48 UTC by Dave Jones
Modified: 2015-01-04 22:18 UTC (History)
3 users (show)

Clone Of:
Last Closed: 2005-10-03 23:06:35 UTC

Attachments (Terms of Use)

Description Dave Jones 2005-04-15 23:48:56 UTC
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}
       <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}
       <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.

Comment 1 Dave Jones 2005-04-15 23:54:59 UTC
killing these processes brings back a speedy desktop. The calls to swapon still
occur though. Wieeeerd.

Comment 2 Dave Jones 2005-04-15 23:57:42 UTC
false alarm on the sys_swapon -- wrong System.map in use. (its slab debug :-)

Why hotplug went nuts is still a mystery though.

Comment 3 Bill Nottingham 2005-04-16 02:42:59 UTC
I'd love to know what that ioctl was..... if you can reproduce it, what files do
they have open?

Comment 4 Bill Nottingham 2005-10-03 22:16:49 UTC
You still seeing this? (Woo, I get to do this this time. :) )

Comment 5 Dave Jones 2005-10-03 23:06:35 UTC
nope, only ever happened once.  *shrug* rawhide oddness of the day I suppose.

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