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Bug 155074 - hotplug gets stuck.
hotplug gets stuck.
Product: Fedora
Classification: Fedora
Component: hotplug (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Bill Nottingham
Brock Organ
Depends On:
  Show dependency treegraph
Reported: 2005-04-15 19:48 EDT by Dave Jones
Modified: 2015-01-04 17:18 EST (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2005-10-03 19:06:35 EDT
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Dave Jones 2005-04-15 19:48:56 EDT
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 19:54:59 EDT
killing these processes brings back a speedy desktop. The calls to swapon still
occur though. Wieeeerd.
Comment 2 Dave Jones 2005-04-15 19:57:42 EDT
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 2005-04-15 22:42:59 EDT
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 18:16:49 EDT
You still seeing this? (Woo, I get to do this this time. :) )
Comment 5 Dave Jones 2005-10-03 19:06:35 EDT
nope, only ever happened once.  *shrug* rawhide oddness of the day I suppose.

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