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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0000560 | mercury | Bug | public | 2022-05-27 17:37 | 2022-05-31 16:24 | ||||||||
| Reporter | wangp | ||||||||||||
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| Priority | normal | Severity | crash | Reproducibility | always | ||||||||
| Status | new | Resolution | open | ||||||||||
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| Target Version | Fixed in Version | ||||||||||||
| Summary | 0000560: asm_fast.gc crashes on aarch64 with gcc 10.2 | ||||||||||||
| Description | Configure enables asm_fast.gc by default on aarch64 but it doesn't work with newer versions of gcc: gcc 10.2, Debian 11 - crash gcc 8.3.0, Debian 10 - ok gcc 6.3.0, Debian 9 - ok reg.gc works so far on a few small programs. I have not tried a bootcheck yet (emulation is slow). | ||||||||||||
| Tags | No tags attached. | ||||||||||||
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juliensf (administrator) 2022-05-27 17:50 |
Does the crash with the sample programs occur with GCC 10.2 occur with: a. --mercury-linkage shared b. --mercury-linkage static c. both Have you tried compiling with gcc -O0? |
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wangp (developer) 2022-05-30 12:10 |
It crashes in all three cases (--mercury-linkage shared, --mercury-linkage static, compiling the standard library and hello.m with gcc -O0). |
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wangp (developer) 2022-05-31 12:37 |
Debian 11 also has a package for gcc version 9.3.0. The sample programs also crash in asm_fast.gc using gcc 9.3.0 in all three cases (--mercury-linkage shared, --mercury-linkage static, compiling the standard library and hello.m with gcc -O0). |
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juliensf (administrator) 2022-05-31 14:18 |
In the absence of an immediate fix, I suggest we disable the use of asm_fast as the LLDS base grade on aarch64 for GCC >= 9 on both the master and release branches (assuming reg.gc is ok.) |
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wangp (developer) 2022-05-31 16:24 |
It has something to do with PIC. Adding this to Mmake.params and compiling the sample programs without PIC makes them not crash: EXTRA_CFLAGS = -fno-pic -fno-PIC -static EXTRA_MLFLAGS = -static (That makes me a bit suspicious that it is something similar to the PIC register issue on x86, but it might be completely unrelated.) For now I agree we should disable asm_fast on aarch64 with GCC >= 9. I'm doing a partial bootcheck on reg.gc to make sure that works ok. |
| Notes |
| Issue History |
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| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2022-05-27 17:37 | wangp | New Issue | |
| 2022-05-27 17:38 | wangp | Severity | minor => crash |
| 2022-05-27 17:50 | juliensf | Note Added: 0001195 | |
| 2022-05-30 12:10 | wangp | Note Added: 0001196 | |
| 2022-05-31 12:37 | wangp | Note Added: 0001197 | |
| 2022-05-31 14:18 | juliensf | Note Added: 0001198 | |
| 2022-05-31 16:24 | wangp | Note Added: 0001199 | |
| Issue History |