[Bug libdw/21602] New: dwfl_addrmodule reports bogus modules for unmapped areas

[jan.kratochvil at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21602

Bug ID: 21602
   Summary: dwfl_addrmodule reports bogus modules for unmapped
areas
   Product: elfutils
   Version: unspecified
Status: NEW
  Severity: normal
  Priority: P2
 Component: libdw
  Assignee: unassigned at sourceware dot org
  Reporter: jan.kratochvil at redhat dot com
CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

LD_LIBRARY_PATH=./libdw/ ./src/addr2line -p $p 0x7f7d33043000

Actual:
insert: 0x55be1a359000..0x55be1a561000 i=0 segndx=-1 need_start=1 need_end=1
insert: 0x7f7d2c0e7000..0x7f7d32c8 i=2 segndx=-1 need_start=1 need_end=1
insert: 0x7f7d33046000..0x7f7d3326d000 i=4 segndx=-1 need_start=1 need_end=1
insert: 0x7ffdcf1bc000..0x7ffdcf1be000 i=6 segndx=-1 need_start=1 need_end=1
0x7f7d33043000 -> /usr/lib64/libc-2.24.so
??:0

Expected:
0x7f7d33043000 -> null
??:0

reify_segments() seems to do something wrong.  That lookup_addr array seems to
be wrongly built.


55be1a359000-55be1a36 r-xp  fd:00 13636393  
/usr/bin/sleep
55be1a55f000-55be1a56 r--p 6000 fd:00 13636393  
/usr/bin/sleep
55be1a56-55be1a561000 rw-p 7000 fd:00 13636393  
/usr/bin/sleep
55be1be9b000-55be1bebc000 rw-p  00:00 0  [heap]
7f7d2c0e7000-7f7d32c8 r--p  fd:00 13651402  
/usr/lib/locale/locale-archive
7f7d32c8-7f7d32e3d000 r-xp  fd:00 13632051  
/usr/lib64/libc-2.24.so
7f7d32e3d000-7f7d3303c000 ---p 001bd000 fd:00 13632051  
/usr/lib64/libc-2.24.so
7f7d3303c000-7f7d3304 r--p 001bc000 fd:00 13632051  
/usr/lib64/libc-2.24.so
7f7d3304-7f7d33042000 rw-p 001c fd:00 13632051  
/usr/lib64/libc-2.24.so
7f7d33042000-7f7d33046000 rw-p  00:00 0 
^^^ 0x7f7d33043000 belongs here with no mapped file
7f7d33046000-7f7d3306b000 r-xp  fd:00 13632665  
/usr/lib64/ld-2.24.so
7f7d3323d000-7f7d3323f000 rw-p  00:00 0 
7f7d33269000-7f7d3326b000 rw-p  00:00 0 
7f7d3326b000-7f7d3326c000 r--p 00025000 fd:00 13632665  
/usr/lib64/ld-2.24.so
7f7d3326c000-7f7d3326d000 rw-p 00026000 fd:00 13632665  
/usr/lib64/ld-2.24.so

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[Bug libdw/21602] dwfl_addrmodule reports bogus modules for unmapped areas

[jan.kratochvil at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21602

Jan Kratochvil  changed:

   What|Removed |Added

 CC||jan.kratochvil at redhat dot 
com

--- Comment #1 from Jan Kratochvil  ---
Created attachment 10149
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10149&action=edit
shown debugging output patch

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[Bug debuginfod/25548] also support canonicalized source-file name lookups in webapi

[jan.kratochvil at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25548

--- Comment #1 from Jan Kratochvil  ---
// g++ -o x x.cpp -Wall $(llvm-config --cxxflags --libs)
#include 
#include 
#include 
int main(int argc, char **argv) {
  while (*++argv) {
llvm::SmallString<128> path(*argv);
if (llvm::sys::path::remove_dots(path, true /*remove_dot_dot*/,
 llvm::sys::path::Style::posix))
  puts(path.c_str());
  }
}

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