Heisenbug in current?

Heisenbug in current?

[Thomas A. Schmitz via ntg-context]

Hi all,

I'm very hesitant to report this because I can't reproduce it 
consistently: some of my files don't compile with bizarre font errors, 
sometimes. At first I thought it may be a hardware problem on my laptop, 
but I've seen more or less the same error on 3 different computers now, 
intermittently. The offending call is always similar:

fonts           > otf loading > loading 
'/mnt/shared/lmtx/tex/texmf/fonts/data/public/dejavu/DejaVuSansMono.ttf', 
hash 'dejavusansmono'
otf reader      > fatal error in file 
'/mnt/shared/lmtx/tex/texmf/fonts/data/public/dejavu/DejaVuSansMono.ttf': 
...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:1040: 
attempt to call a nil value (field 'to16dot16')

It concerns several fonts, both my own and (as here) from the 
installation, and the first error is always this "field 'to16dot16.'" 
Has anybody else seen this? Do the developers have any idea what this 
could be? Has there been a change in the code concerning this field?

Sorry for being so vague, but I'm pulling my hair  because this error 
crops up totally at random, AFAICS.

All best

Thomas
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Re: Heisenbug in current?

[Hans Hagen via ntg-context]

On 11/23/2022 11:01 PM, Thomas A. Schmitz via ntg-context wrote:
> Hi all,
> 
> I'm very hesitant to report this because I can't reproduce it 
> consistently: some of my files don't compile with bizarre font errors, 
> sometimes. At first I thought it may be a hardware problem on my laptop, 
> but I've seen more or less the same error on 3 different computers now, 
> intermittently. The offending call is always similar:
> 
> fonts           > otf loading > loading 
> '/mnt/shared/lmtx/tex/texmf/fonts/data/public/dejavu/DejaVuSansMono.ttf', hash 'dejavusansmono'
> otf reader      > fatal error in file 
> '/mnt/shared/lmtx/tex/texmf/fonts/data/public/dejavu/DejaVuSansMono.ttf': ...e0dde776fb1556f32e/formats/luametatex/font-otr-macro.lua:1040: attempt to call a nil value (field 'to16dot16')
> 
> It concerns several fonts, both my own and (as here) from the 
> installation, and the first error is always this "field 'to16dot16.'" 
> Has anybody else seen this? Do the developers have any idea what this 
> could be? Has there been a change in the code concerning this field?
> 
> Sorry for being so vague, but I'm pulling my hair  because this error 
> crops up totally at random, AFAICS.
probably not that random ... can you put this on top of font-otr.lua

local number = number

and see if that helps .. if so you can then spend the rest of the 
evening figuring out where 'number' gets defined global

Hans

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Re: Heisenbug in current?

[Thomas A. Schmitz via ntg-context]

On 11/23/22 23:25, Hans Hagen via ntg-context wrote:
> probably not that random ... can you put this on top of font-otr.lua
> 
> local number = number
> 
> and see if that helps .. if so you can then spend the rest of the 
> evening figuring out where 'number' gets defined global

Yup, that seems to help! Thank you for the quick fix - I could swear it 
would pop up randomly, and sometimes not at all. As for the global 
definition - that will have to wait till tomorrow. I just had to take a 
painkiller because my back hurts and start feeling very tired... Thanks, 
as always!

Good night everybody

Thomas
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