wafer.space Community - `librelane-magicdrc` crashes

7:20 a.m.

No, that is not expected. librelane-magicdrc only skips the KLayout.DRC step. Streamout, however, should still be done with both magic and KLayout in order to compare the GDS. Can you verify that both 56-magic-streamout and 57-klayout-streamout contain a GDS?

Haha ok, I'll dig in a bit more this evening! Thanks

1

so yeah, the .magic.drc has a size of 0 bytes, and the previous step failed, citing:

Cell nmos_1p2_02_R270_512x8m81 read from path /home/luke/proj/riscboy-180/gf180mcu/gf180mcuD/libs.ref/gf180mcu_fd_ip_sram/mag
File /home/luke/proj/riscboy-180/gf180mcu/gf180mcuD/libs.ref/gf180mcu_fd_ip_sram/mag/M1_PSUB_05_512x8m81.mag couldn't be read
Failure to read entire subtree of the cell.
Failed on cell M1_PSUB_05_512x8m81.
I/O error in writing file /home/luke/proj/riscboy-180/librelane/runs/RUN_2025-11-19_18-47-13/56-magic-streamout/chip_top.magic.gds.
File may be incompletely written.
[INFO] GDS Write Complete

That SRAM filename does look wrong to me. This similar filename does exist: ./gf180mcu/gf180mcuD/libs.ref/gf180mcu_fd_ip_sram/mag/M1_PSUB_05_512x8m81.mag Not totally sure where the incorrect filename is coming from. I don't see it in my config.yaml

7:11 p.m.

oh wait no, that filename (from find) does match the one that magic couldn't read

Hm, maybe too many file handlers open? On what platform are you building?

ahhh that could be it

7:12 p.m.

I'm on Ubuntu

On Debian I haven't had this issue before

luke@triton:~/proj/riscboy-180/hdl$ cat /proc/sys/fs/file-max
9223372036854775807
luke@triton:~/proj/riscboy-180/hdl$ ulimit -Hn
1048576
luke@triton:~/proj/riscboy-180/hdl$ ulimit -Sn
1024
luke@triton:~/proj/riscboy-180/hdl$

wat

7:16 p.m.

thanks that was a good tip, I'll try with an increased limit. Somehow never hit this before

I only thought of it because ReJ has hit it on macOS recently ^^

1

you do tend to develop these spidey senses over time on a project

1

It seems much happier now. Thank you very much for your help

Glad I could help!

@Leo Moser (mole99) - Maybe LibreLane should have a check that ulimit is a reasonable value?

Tim 'mithro' Ansell

@Leo Moser (mole99) - Maybe LibreLane should have a check that ulimit is a reasonable value?

Working on it: https://github.com/librelane/librelane/issues/818

Check or set the maximum number of open file descriptors · Issue #...

Description Leading up to the first wafer.space shuttle, two users faced the issue that the max open file descriptors count was set too low by default. One user is on Ubuntu and the other on macOS,...