cpu% mount /srv/9660 /n/iso /usr/cinap_lenrek/www/9front/9front-8593*386.iso
cpu% cd /n/iso
cpu% cd 386
cpu% acid -
cpu% ktrace -i 9pc f01077f0 f0018c65
src(0xf01077f0); // dumpstack+0x10
// data at 0xf0018c6d? f017528a
src(0xf017528a); // panic+0xd2
// data at 0xf0018d95? f0107b8d
src(0xf0107b8d); // fault386+0xe7
// data at 0xf0018e45? f01065c9
src(0xf01065c9); // irqhandled+0x3f
// data at 0xf0018e6d? f0107155
src(0xf0107155); // trap+0x2a
// data at 0xf0018e91? f01006cd
src(0xf01006cd); // forkret
//passing interrupt frame; last pc found at sp=0xf0018e91
// data at 0xf0018ed1? f01ed810
src(0xf01ed810); // i82563detach+0x2c
// data at 0xf0018ef1? 
//didn't find pc at sp=0xf0018ef1, last pc found at sp=0xf0018ed1
cpu% acid 9pc
9pc:386 plan 9 boot image
/sys/lib/acid/port
/sys/lib/acid/386
acid: asm(i82563detach)
i82563detach 0xf01ed7e4	SUBL	$0x14,SP
i82563detach+0x3 0xf01ed7e7	MOVL	ctlr+0x0(FP),DX
i82563detach+0x7 0xf01ed7eb	MOVL	0xcc(DX),AX
i82563detach+0xd 0xf01ed7f1	CMPL	$0x2000,AX
i82563detach+0x12 0xf01ed7f6	JLE	i82563detach+0x2d(SB)
i82563detach+0x14 0xf01ed7f8	MOVL	0x14(DX),AX
i82563detach+0x17 0xf01ed7fb	LEAL	0x0(AX)(AX*2),AX
i82563detach+0x1a 0xf01ed7fe	SHLL	$0x2,AX
i82563detach+0x1d 0xf01ed801	MOVL	cttab+0x8(SB)(AX*1),AX
i82563detach+0x24 0xf01ed808	ANDL	$0x8,AX
i82563detach+0x27 0xf01ed80b	JNE	i82563detach+0x26c(SB)

*instruction boundary expected at 0xf01ed810* IMPOSSIBLE!

i82563detach+0x2d 0xf01ed811	MOVL	0x14(DX),AX
i82563detach+0x30 0xf01ed814	CMPL	AX,$0x6
i82563detach+0x33 0xf01ed817	JNE	i82563detach+0x46(SB)
i82563detach+0x35 0xf01ed819	MOVL	0xcc(DX),AX
i82563detach+0x3b 0xf01ed81f	CMPL	$0x5ea,AX
i82563detach+0x40 0xf01ed824	JGT	i82563detach+0x257(SB)
i82563detach+0x46 0xf01ed82a	MOVL	0xd0(DX),CX
i82563detach+0x4c 0xf01ed830	MOVL	0x1000(CX),CX
i82563detach+0x52 0xf01ed836	MOVL	CX,0x548(DX)
i82563detach+0x58 0xf01ed83c	MOVL	0xd0(DX),AX
i82563detach+0x5e 0xf01ed842	MOVL	$0xffffffff,0xd8(AX)
i82563detach+0x68 0xf01ed84c	MOVL	0xd0(DX),AX
i82563detach+0x6e 0xf01ed852	MOVL	$0x0,0x100(AX)
i82563detach+0x78 0xf01ed85c	MOVL	0xd0(DX),AX
i82563detach+0x7e 0xf01ed862	MOVL	0xd0(DX),CX
i82563detach+0x84 0xf01ed868	MOVL	0x400(CX),CX
i82563detach+0x8a 0xf01ed86e	ANDL	$0xfffffffd,CX
i82563detach+0x8d 0xf01ed871	MOVL	CX,0x400(AX)
i82563detach+0x93 0xf01ed877	MOVL	$0xa,AX
acid: src(0xf01ed810)
/sys/src/9/pc/ether82563.c:1452
 1447	i82563detach(Ctlr *ctlr)
 1448	{
 1449		int r, timeo;
 1450	
 1451		/* balance rx/tx packet buffer; survives reset */
>1452		if(ctlr->rbsz > 8192 && cttab[ctlr->type].flag & Fpba){ <---- total nonsense
 1453			ctlr->pba = csr32r(ctlr, Pba);
 1454			r = ctlr->pba >> 16;
 1455			r += ctlr->pba & 0xffff;
 1456			r >>= 1;
 1457			csr32w(ctlr, Pba, r);
acid: 
cpu% sha1sum 9pc
97ca052c7a2dff3ac2caeaa6c05956ce50539b4a	9pc
cpu% sha1sum /usr/cinap_lenrek/www/9front/9front-8593*386.iso
1e2a08aaa2704e7423af31ad1ecd6d5a820866ce	/usr/cinap_lenrek/www/9front/9front-8593.acc504c319a4b4188479cfa602e40cb6851c0528.386.iso