Camelia, the Perl 6 bug

IRC log for #darcs, 2013-04-24

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All times shown according to UTC.

Time Nick Message
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13:53 burp hi
13:54 burp looks like my repository got corrupted, every time I try to "get" it, darcs crashes with a bus error
13:54 burp any hints on how to debug this?
13:56 owst burp: what's a bus error? What error message do you get?
13:57 burp zsh: bus error (core dumped)
13:57 burp looks like a low level error
13:58 owst Which version of darcs are you using?
13:58 owst I have no idea what a bus error is :-)
13:58 burp it's 2.8.4 :D
13:58 burp I try to make a -debug build
13:58 owst Is the repo sharable publicly?
13:59 burp sadly not :/
13:59 owst What darcs command were you trying?
13:59 burp darcs get
13:59 owst Oh sorry, you said that
13:59 burp I will try some things myself
14:00 owst Try with some other repos?
14:00 burp yea, it's just this one
14:00 burp #0  0x00007ffff642c442 in __memcpy_sse2 () from /usr/lib/libc.so.6
14:00 burp #1  0x000000000088d474 in darcs_sha256 ()
14:00 owst Trying with other versions of darcs would be easy
14:01 owst s/easy/useful/g
14:01 burp this is a gdb backtrace from non debug version build, I will use -debug now
14:03 kerneis it makes sense
14:03 kerneis sigbus happens if the data is not aligned correctly
14:04 kerneis and one of the few places where alignment still matters on x86 is for sse2
14:04 kerneis (the other possibility is when dealing with memory mapped files)
14:04 owst Interesting
14:05 kerneis (or dereferencing huge pointers, outside of your virtual memory)
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