[haiku-bugs] Re: [Haiku] #9858: Ripping CDs -> page fault panic
- From: "ttcoder" <trac@xxxxxxxxxxxx>
- Date: Tue, 23 Jul 2013 16:20:31 -0000
#9858: Ripping CDs -> page fault panic
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Reporter: ttcoder | Owner: nobody
Type: bug | Status: assigned
Priority: high | Milestone: R1/beta1
Component: System/Kernel | Version: R1/Development
Resolution: | Keywords: slab
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by ttcoder):
Ingo, long story short -- SMP makes a bit of difference quantatively, but
not qualitatively, Also I did a "page_stats" in case you want to take a
look.
@korli & bonefish: in case that matters, when I toyed with Pulse to
disable a core I always disabled the ''second'' one, leaving only the
''first'' CPU running. As to the disabled SMP case, I notice Pulse and
ProcessController behave as if there is only one CPU in the system at all,
so I dunno which it is (probably same situation, it's CPU # 0 that's
running and handling interrupts?).
The long version:
After Ingo's explanation I rebooted and picked "Disable SMP" in the boot
menu. Ended up with only one CPU gauge in the deskbar ..etc as should be.
Started ripping, reading the news, listening to ripped tracks
(quitting/restarting/quitting/restarting MediaPlayer each time, so as the
"mutate" the kernel structures as much and as often as possible), doing
Alt-A select all and "Get Info" in tracker ..etc. After 4 CDs the thing
was still running like a champ so I started to feel excited, "wow this
test is hammering the machine in an unprecedented way yet it won't crash
with SMP disabled, so we have uncovered an SMP-specific bug in
Haiku"-style. On the fifth CD it KDL'ed though, sigh! So SMP is not the
culprit it seems.
I've seen in the "sister" tickets that Ingo recommended using "page_stats"
too, so I did (see attached screen grab).
Also I noticed this in my syslog, but it's there even when not ripping CDs
so probably not significant: {{{mark_page_range_in_use(0x0, 0xa0): start
page is before free list}}}
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Ticket URL: <http://dev.haiku-os.org/ticket/9858#comment:13>
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