Your message dated Sat, 14 Nov 2009 20:59:44 +0100 with message-id <[email protected]> has caused the report #556133, regarding libdw1: causes segfault in systemtap when used with split debuginfo for kernel modules to be marked as having been forwarded to the upstream software author(s) [email protected]
(NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 556133: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=556133 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Hi, It seems that there is a problem with reading files that only have debug information. The file with debug info is split in a file without debug info and one with only debug info. Such a file still contains the section headers but not the actual data the belongs to that section. The type has been changed from PROGBITS to NOBITS. Because it's set to NOBITS, nothing gets read from the file (in __libelf_set_rawdata_wrlock()). In relocate_section() it seems to assume that the section was loaded in memory, but it isn't. tdata->d_buf is NULL. This later results in a segfault. This can be reproduced with "eu-readelf -a tst.debug". I've attached a small test case which source was: int main(){return 0;} I then used: gcc tst.c -o tst -g objcopy --only-keep-debug tst tst.debug elflint produces a whole bunch of warnings on that file, mostly saying "wrong type: expected PROGBITS, is NOBITS" There is also a little more information and an other testcase at http://bugs.debian.org/556133 Kurt
tst.debug
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