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#uml IRC Logs for 2007-11-23

---Logopened Fri Nov 23 00:00:03 2007
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08:03<IntuitiveNipple-#uml->>2.6.22 x86_64 host (no SKAS3 patch), 2.6.22 x86 guest, with SKAS0. When /sbin/init calls mmap() for a config-file mmap() returns a pointer and sets length, but *any* attempt to access the data in the mmap (e.g. size_t total=0; const char *p=mmap(...); total+=p[0];) causes the CPU to spin hard and the only recovery is to kill the UML kernel processes on the host. Any ideas what is going on?
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13:24|-|karol changed nick to Magotari
13:24<Magotari-#uml->>No jdike again?
13:24<IntuitiveNipple-#uml->>probably having a well-deserved rest :)
13:25<Magotari-#uml->>Yeah, he is quite hard working.
13:25<IntuitiveNipple-#uml->>I'm chasing down a confusing bug... wish I was away from it too!
13:25<Magotari-#uml->>I wish it were my job for a living too...
13:25<Magotari-#uml->>Yeah, bug? What is it this time?
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13:26<IntuitiveNipple-#uml->>It might be the same recurring.. I may have somehow got a false solution last time...
13:26<IntuitiveNipple-#uml->>2.6.22 x86_64 host (no SKAS3 patch), 2.6.22 x86 guest, with SKAS0. When /sbin/init calls mmap() for a config-file mmap() returns a pointer and sets length, but *any* attempt to access the data in the mmap (e.g. size_t total=0; const char *p=mmap(...); total+=p[0];) causes the CPU to spin hard and the only recovery is to kill the UML kernel processes on the host. Any ideas what is going on?
13:26<Magotari-#uml->>God.
13:26<Magotari-#uml->>No, no ideas at all.
13:27<IntuitiveNipple-#uml->>I'm dropping code into init, and any attempt to access the data at the mmap-ed pointer causes it.
13:27<Magotari-#uml->>Does bash misbehave too?
13:27<Magotari-#uml->>It would be an idea to see if syscalls in general are a problem.
13:27<IntuitiveNipple-#uml->>anything that uses mmap, hence can't start the userspace
13:28<IntuitiveNipple-#uml->>I've been trying to cherry-pick some recent patches related to i386 on 64-bit, but no luck so far
13:28<Magotari-#uml->>How about a new kernel?
13:28<IntuitiveNipple-#uml->>For the guest?
13:29<Magotari-#uml->>Yeah.
13:30<IntuitiveNipple-#uml->>I'll try that after dinner... because this was working (maybe only at times) as I've been progressing with UML, I thought it was a temporary problem in my userspace distro config, but now I've traced it, it feels/looks like a 32<>64 bit issue
13:36<Magotari-#uml->>I gather you are in Europe?
13:42<IntuitiveNipple-#uml->>Yes, UK
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13:43<IntuitiveNipple-#uml->>Is it worth going for the latest 2.6.23-rc2 ?
13:44<Magotari-#uml->>It is worth a try, I think.
13:45<IntuitiveNipple-#uml->>If it saves me having to debug instead of get on with things... yes :)
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15:04<caker-#uml->>IntuitiveNipple: ITYM 2.6.24-rc3 ?
15:05<IntuitiveNipple-#uml->>I'm not sure atm... I grabbed Linus's latest head
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---Logclosed Sat Nov 24 00:00:32 2007