Re: [9front] acme: suicide when using upas/Mail

[ori@eigenstate.org]

Quoth unobe@cpan.org:
> read error from temp file

Are you sure? The code says:

		if(nr <= 0)
			error("read error from temp file");

and error does:

	fprint(2, "acme: %s: %r\n", s);


so at minimum, I'd expect the full error to start with 'acme:',
and a second ':' after "read error from temp file". Those are
both bits of information that are useful to match things up
with what happened.

If there's an empty error string, which is printed by the '%r'
in error(), that means we got the only possible non-error
condition reading the temp file, an EOF (r == 0). I don't
know why we'd get that, but it leads down a different path
to investigate than a disk read error.

> Quoth ori@eigenstate.org:
> > what's the exact error? this is acme suiciding after a pread() fails,
> > and the errstr says why.
> > '
> > Quoth unobe@cpan.org:
> > > Has anyone come across acme suicide not being able to read a temporary
> > > file?  My HEAD is slightly behind:
> > > 	Hash:	a327175a3c01d18e3e4c061ce4579cc420ee3561
> > > 	Author:	cinap_lenrek <cinap_lenrek@felloff.net>
> > > 	Date:	Sat Sep 30 10:06:58 -0700 2023
> > > 
> > > I thought there might have recent work in caching for Mail, but a
> > > quick scan of the git/log didn't bring up any commit.  upas/Mail was
> > > the only program I was running in acme.  Here's the lstk() output:
> > > 
> > > cpu% acid 1486111
> > > /proc/1486111/text:amd64 plan 9 executable
> > > /sys/lib/acid/port
> > > /sys/lib/acid/amd64
> > > acid: lstk()
> > > abort()+0x0 /sys/src/libc/9sys/abort.c:6
> > > error()+0x2f /sys/src/cmd/acme/util.c:55
> > > diskread(d=0x448f80,b=0x454d60,n=0x36d4,r=0x497ef0)+0xa6 /sys/src/cmd/acme/disk.c:138
> > > 	p=0x497ef0
> > > 	tot=0x203f6700000000
> > > 	nr=0xffffffff
> > > setcache(q0=0x0,b=0x449fe0)+0xf4 /sys/src/cmd/acme/buff.c:118
> > > 	q=0x3400045a240
> > > 	blp=0x4089b0
> > > 	i=0x454d6000000340
> > > 	bl=0x454d60
> > > bufread(b=0x449fe0,q0=0x0,n=0x1,s=0x49598c)+0x47 /sys/src/cmd/acme/buff.c:288
> > > 	m=0x21ccf700000000
> > > textreadc(q=0x0)+0x46 /sys/src/cmd/acme/text.c:509
> > > 	r=0x20322500000000
> > > number(dir=0x0,line=0x8,t=0x449b38,.ret=0x495a38,size=0x100000001,r=0x0,evalp=0x495b54,md=0x4490c0)+0x25a /sys/src/cmd/acme/addr.c:98
> > > 	q0=0x20397900000000
> > > 	q1=0x1
> > > address(.ret=0x495af0,ar=0x0,q0=0x0,q1=0x1,a=0x45a250,getc=0x220bdb,qp=0x495b5c,t=0x449b38,md=0x4490c0,lim=0xffffffffffffffff,evalp=0x495b54)+0x58d /sys/src/cmd/acme/addr.c:247
> > > 	r=0x0
> > > 	q=0x800000001
> > > 	dir=0x224d1100000000
> > > 	size=0x1
> > > 	prevc=0x100000000
> > > 	nr=0x495a5c
> > > 	c=0x38
> > > 	n=0x4089b000000008
> > > 	npat=0x100000001
> > > 	pat=0x0
> > > xfidwrite(x=0x493ad0)+0x5d1 /sys/src/cmd/acme/xfid.c:459
> > > 	w=0x4499e0
> > > 	qid=0xa
> > > 	fc=0x4810b0
> > > 	t=0x449b38
> > > 	nr=0x100000001
> > > 	r=0x45a250
> > > 	eval=0x100000001
> > > 	a=0x1
> > > 	nb=0xa00000001
> > > 	err=0x497c00
> > > 	q0=0x449b3800000000
> > > 	tq0=0x23396a
> > > 	tq1=0x23396a00000000
> > > 	buf=0x41e8e000000000
> > > xfidctl(arg=0x493ad0)+0x35 /sys/src/cmd/acme/xfid.c:52
> > > 	x=0x493ad0
> > > launcheramd64(arg=0x493ad0,f=0x22373a)+0x10 /sys/src/libthread/amd64.c:11
> > > 0xfefefefefefefefe ?file?:0
> > > 
> > 
>