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Date: Sat, 9 Aug 2014 17:42:25 +0200
From: cinap_lenrek@felloff.net
To: 9front@9front.org
Subject: Re: [9front] stats(1) suicide
In-Reply-To: <7DA01EF3-861B-4638-B9E7-A03D7933956D@ar.aichi-u.ac.jp>
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many thanks kenji. i see whats wrong now. the bug is in iobufinit().

	xiop = ialloc(niob * RBUFSIZE, 0);

niob is uint so we get 32bit result.

iobufinit+0x114 0x000000000021ecd2	MOVL	niob(SB),BP
iobufinit+0x11b 0x000000000021ecd9	SHLL	$0xe,BP				/* multiplication by shift */
iobufinit+0x11e 0x000000000021ecdc	MOVL	BP,BP
iobufinit+0x120 0x000000000021ecde	MOVL	$0x0,0x8(SP)
iobufinit+0x128 0x000000000021ece6	CALL	ialloc(SB)

you must have raised fsmempercent so that it used more than 4g
for buffers causing the overflow.

i pushed fix now that does 64bit multiplications on amd64 so it
should work now after pull and recompiling cwfs and kernel.

--
cinap