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Thread: `librelane-magicdrc` crashes

17 Discord messages from 📐 - Designing/📝-project-template/threads/librelane-magicdrc-crashes.md.

Category: 📐 - Designing Parent channel: #📝-project-template Thread ID: 1440476423059013804

Messages: 17

message-1440602668757287075

2025-11-19T07:20:41.335+00:00 — Leo Moser (mole99) (@mole99)

Reply/reference

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message-1440602673681403976

2025-11-19T07:20:42.509+00:00 — Leo Moser (mole99) (@mole99)

Content

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?
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message-1440654517463945236

2025-11-19T10:46:43.03+00:00 — LukeW (@luke_w)

Content

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

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message-1440781158366580829

2025-11-19T19:09:56.574+00:00 — LukeW (@luke_w)

Content

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`
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message-1440781614711050302

2025-11-19T19:11:45.375+00:00 — LukeW (@luke_w)

Content

oh wait no, that filename (from `find`) does match the one that magic couldn't read 🤔
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message-1440781775222607953

2025-11-19T19:12:23.644+00:00 — Leo Moser (mole99) (@mole99)

Content

Hm, maybe too many file handlers open? On what platform are you building?
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message-1440781804088066239

2025-11-19T19:12:30.526+00:00 — LukeW (@luke_w)

Content

ahhh that could be it
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message-1440781823679528980

2025-11-19T19:12:35.197+00:00 — LukeW (@luke_w)

Content

I'm on Ubuntu
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message-1440781971801509998

2025-11-19T19:13:10.512+00:00 — Leo Moser (mole99) (@mole99)

Content

On Debian I haven't had this issue before 🤔
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message-1440782268577616033

2025-11-19T19:14:21.269+00:00 — LukeW (@luke_w)

Content

```
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
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message-1440782767678947468

2025-11-19T19:16:20.264+00:00 — LukeW (@luke_w)

Content

thanks that was a good tip, I'll try with an increased limit. Somehow never hit this before 😅
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message-1440783145090683041

2025-11-19T19:17:50.246+00:00 — Leo Moser (mole99) (@mole99)

Content

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

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message-1440783231808180265

2025-11-19T19:18:10.921+00:00 — LukeW (@luke_w)

Content

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

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message-1440788944072478730

2025-11-19T19:40:52.831+00:00 — LukeW (@luke_w)

Content

It seems much happier now. Thank you very much for your help
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message-1440792290833465424

2025-11-19T19:54:10.761+00:00 — Leo Moser (mole99) (@mole99)

Content

Glad I could help!
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message-1440806715737247868

2025-11-19T20:51:29.926+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

@Leo Moser (mole99) - Maybe LibreLane should have a check that ulimit is a reasonable value?
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message-1441002039063871549

2025-11-20T09:47:38.636+00:00 — Leo Moser (mole99) (@mole99)

Reply/reference

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Content

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

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