[BUG][2.4] /proc/kcore is a random generator ?
From: Willy Tarreau (willy_at_w.ods.org)
Date: 02/26/04
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Date: Thu, 26 Feb 2004 17:16:37 +0100 To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Hi all,
I'm encountering a rather strange behaviour here with 2.4.25 on a P4 HT,
even when I boot it with "nosmp" :
- du /proc/kcore says '525255' (I have 512 MB RAM)
- if I do it again many several times, sometimes it says '0'
- after a moment (or several tests, I don't know), it stabilizes to some
value (either 0 or 525255).
- then, just starting vmstat, or logging into the system is enough to
make it switch to the other value.
At first, I had the feeling that it displayed '0' when I have an even number
of processes, and 525255 when I have an odd number, but it's not even the case.
Once it doesn't move by itself, a few fork/exec are enough to switch the value.
If I boot in HT mode, sometimes I can reliably make it display 0 and 525255
alternatively, just as if the pid parity or CPU number was involved in the
result.
Update: same results with 2.4.26-pre1. du from coreutils 4.5.4 and 5.0.
This is amazing. Did anyone notice this ? A friend just told me that plain
2.4.22 on his notebook does the same !
Regards,
Willy
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- Previous message: Shailabh Nagar: "[RFC] New API and design for Class-based Kernel Resource Management"
- In reply to: Marcelo Tosatti: "linux-2.4.25 released"
- Next in thread: Richard B. Johnson: "Re: [BUG][2.4] /proc/kcore is a random generator ?"
- Reply: Richard B. Johnson: "Re: [BUG][2.4] /proc/kcore is a random generator ?"
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