[haiku-bugs] Re: [Haiku] #10694: Somewhat reproducible KDL: power_daemon in wait_for_objects()
- From: "ttcoder" <trac@xxxxxxxxxxxx>
- Date: Mon, 24 Mar 2014 11:56:59 -0000
#10694: Somewhat reproducible KDL: power_daemon in wait_for_objects()
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Reporter: ttcoder | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Servers/power_daemon | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by ttcoder):
Making the steps available for others to try this out, as I've managed to
reproduce this on another machine for the first time yesterday, so I
assumed wrong it thinking nobody else could ever see this, I just hadn't
tried hard enough.
Again, this pretty much requires a ca. ''46368'' nightly as this is the
one that exposes a vulnerability in the kernel. The ones before did not
have the CPU-hog code, and neither did the ones soon after (would
appreciate confirmation of my working theory from the haiku head-honchos:
revisions around this one exhibit kernel instability and sometimes also
userland crashes; starting with hrev46370 korli fixed the 100% CPU usage
kernel thread and it became much more difficult to expose this kernel
flaw; '''am I right in assuming that hrev46370 does not fix any memory
corruption related bug, it only fixes excessive CPU usage, hence the
crashes in previous revs were possibly due to "pressure" put on the kernel
?''' That would be something worth investigating if so, as that might
still be present in the current 47xxx revs, but tell me if my intuition is
dead wrong again :-) (heck, maybe somebody could even try building a
current nightly with current baseline code except for a reversal of
hrev46370, to see if the 100% CPU usage pressure still crashes current
nightlies; there's probably a multitude of other ways to induce 100%
kernelland CPU usage too!)
=======
Ingredients:
- Tracker
- Terminal
- Filetypes
Recipe:
- cold boot
- wait for things to settle down (the Network notification window i.e.)
- Alt-Opt-F to '''open Filetypes''' 's main window
- click on the desktop, then Alt-N, then <enter> <enter> to open the
created '''New Folder'''
- with the new folder selected, alt-N/enter/enter again; repeat until you
have 4 windows open
- Alt-Opt-T to '''open a Terminal'''
- Alt-N, until you have 4 terminals open
- select the first created New Folder on the desktop, Alt-T to '''trash
that folder'''. All its children windows disappear too.
- in quick succession, click Terminal 4 and Alt-W to '''close that
terminal''', same with 3 2 and 1.
- '''close Filetypes'''
- Deskbar > shutdown > restart (or power off)
With some luck you'll get the attached kernel panic.
--
Ticket URL: <https://dev.haiku-os.org/ticket/10694#comment:1>
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