| --- | Log | opened Sat Jan 26 00:00:24 2008 |
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| 03:04 | <flips:#uml> | when I get a segfauilt inside uml I don't get a traceback of where the segfault happened, instead I get 081fbd0c: [<08066c83>] hard_handler+0xf/0x14 etc, not informative |
| 03:04 | <flips:#uml> | anybody know what's going on? |
| 03:04 | <flips:#uml> | 2.6.23.12 |
| 03:27 | <Magotari:#uml> | Hey, flips. Is the segfault in the guest kernel or the guest userspace? |
| 03:27 | <flips:#uml> | in the guest kernel |
| 03:27 | <Magotari:#uml> | This seems signal handling related. Now, my knowledge is small and I may be wrong, but here is what I know: |
| 03:28 | <Magotari:#uml> | A signal arrives, execution is put into a different track to handle it. And thus the segfault is not informative. |
| 03:28 | <flips:#uml> | bug? |
| 03:28 | <Magotari:#uml> | Just so you know, UML uses signals and segfaults internally. A segfault may be continued from if you are finding this under gdb. |
| 03:29 | <flips:#uml> | not under gdb |
| 03:29 | <Magotari:#uml> | May be a bug. I'm a junior junior junior contributor here, so I'm hardly an authority. |
| 03:29 | <flips:#uml> | behavior of a native kernel would be to produce a traceback |
| 03:29 | <Magotari:#uml> | When does this crash happen? |
| 03:29 | <flips:#uml> | it's a result of a simple segfault in my kernel code |
| 03:30 | <Magotari:#uml> | Yes, this is a different architectural port of linux. Different behavior is to be expected in different arches. |
| 03:30 | <flips:#uml> | different port? |
| 03:30 | <Magotari:#uml> | I may be wrong on this, so best talk to jdike. He will be here on monday, I think. |
| 03:30 | <flips:#uml> | oh |
| 03:30 | <Magotari:#uml> | Yes, UML is a different architecture. |
| 03:30 | <flips:#uml> | well producing tracebacks is the expected behaviour on all arches |
| 03:31 | <flips:#uml> | for oopses |
| 03:31 | <Magotari:#uml> | Take a look at arch/um/ |
| 03:31 | <flips:#uml> | which this is |
| 03:31 | <Magotari:#uml> | Yes, I hear your point there. |
| 03:31 | <Magotari:#uml> | I disagree, but as I said, I'm new. Best talk to the guy who wrote UML, he will know for sure. I'm afraid I can't help you. It could be that you indeed exposed some bug there. |
| 03:32 | <flips:#uml> | Kconfig.i386 |
| 03:32 | <Magotari:#uml> | Try the latest -mm too. Many bugs have been fixed in it, might help you out. |
| 03:32 | <Magotari:#uml> | Yes, UML has subarches too. |
| 03:32 | <flips:#uml> | disagree about what? |
| 03:33 | <Magotari:#uml> | That UML does not provide a traceback. It provides one, just a useless one. |
| 03:33 | <flips:#uml> | that is a bug then |
| 03:34 | <Magotari:#uml> | I won't argue, as I'm not an expert. I claim ignorance, and please talk to jdike. I'm not the smartest one, and its a pity that I can't help you out. |
| 03:34 | <flips:#uml> | thanks for trying |
| 03:35 | <Magotari:#uml> | Welcome. If you have any questions I can try again. |
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| 03:40 | <flips:#uml> | hmm, now I see a backtrace |
| 03:40 | <flips:#uml> | what changed |
| 03:45 | <flips:#uml> | and now the backtrace is gone again |
| 03:45 | <flips:#uml> | definitely a bug |
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| 03:48 | <Magotari:#uml> | -mm might fix your problem. Might not. Worth a shot. |
| 03:49 | <flips:#uml> | except if the kernel patch I am debugging is not ported to -mm |
| 03:49 | <flips:#uml> | 2.6.24 would be more feasible |
| 03:51 | <flips:#uml> | anyway, I get a backtrace sometimes, sometimes not. have not detected a causal relationship yet |
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| 17:31 | <ds2:#uml> | ~ |
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| --- | Log | closed Sun Jan 27 00:00:20 2008 |
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