[Bug remote/19863] New: 7.10 regression: gdb remote.c due to "setfs" with gdbserver <=7.9

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19863

            Bug ID: 19863
           Summary: 7.10 regression: gdb remote.c due to "setfs" with
                    gdbserver <=7.9
           Product: gdb
           Version: 7.10
            Status: NEW
          Severity: normal
          Priority: P2
         Component: remote
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
  Target Milestone: ---

gdb-7.9 gdbserver-7.9 PASS:
host1$ gdbserver-7.9 :1234 /root/inferior
host2$ gdb-7.9 -ex 'set sysroot remote:' -ex 'file
/root/inferior-copy-from-host1' -ex 'target remote host1:1234' 
Reading symbols from /root/inferior-copy-from-host1...done.
Remote debugging using host1:1234
Reading symbols from remote:/lib64/ld-linux-x86-64.so.2...(no debugging symbols
found)...done.
0x00007ffff7ddc430 in _start () from remote:/lib64/ld-linux-x86-64.so.2
(gdb) b main
Breakpoint 1 at 0x40071a: file threadit.c, line 18.
(gdb) c
Continuing.
Breakpoint 1, main () at threadit.c:18
18        var++;
(gdb) info sharedlibrary 
>From                To                  Syms Read   Shared Object Library
0x00007ffff7ddbae0  0x00007ffff7df627a  Yes (*)    
remote:/lib64/ld-linux-x86-64.so.2
0x00007ffff7bc48a0  0x00007ffff7bcf514  Yes (*)    
remote:/lib64/libpthread.so.0
0x00007ffff781d3e0  0x00007ffff7960c10  Yes (*)     remote:/lib64/libc.so.6
(*): Shared library is missing debugging information.

gdb-7.10 gdbserver-7.9 FAIL:
host1$ gdbserver-7.9 :1234 /root/inferior
                 ^^^
host2$ gdb-7.10 -ex 'set sysroot remote:' -ex 'file
/root/inferior-copy-from-host1' -ex 'target remote host1:1234' 
warning: "remote:" is deprecated, use "target:" instead.
warning: sysroot set to "target:".
Reading symbols from /root/inferior-copy-from-host1...done.
Remote debugging using host1:1234
Reading /lib64/ld-linux-x86-64.so.2 from remote target...
warning: File transfers from remote targets can be slow. Use "set sysroot" to
access files locally instead.
warning: Unable to find dynamic linker breakpoint function.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
0x00007ffff7ddc430 in ?? ()
(gdb) b main
Breakpoint 1 at 0x40071a: file threadit.c, line 18.
(gdb) c
Continuing.
Reading /lib64/libpthread.so.0 from remote target...
Error while mapping shared library sections:
Could not open `target:/lib64/libpthread.so.0' as an executable file: Invalid
argument
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Reading /lib64/libc.so.6 from remote target...
Error while mapping shared library sections:
Could not open `target:/lib64/libc.so.6' as an executable file: Invalid
argument
Reading /lib64/ld-linux-x86-64.so.2 from remote target...
Error while mapping shared library sections:
Could not open `target:/lib64/ld-linux-x86-64.so.2' as an executable file:
Invalid argument
Breakpoint 1, main () at threadit.c:18
18        var++;
(gdb) info sharedlibrary 
>From                To                  Syms Read   Shared Object Library
                                        No          /lib64/libpthread.so.0
                                        No          /lib64/libc.so.6
                                        No          /lib64/ld-linux-x86-64.so.2

Re: [patch] Suggest newer gdbserver if it has no qXfer:exec-file:read
https://sourceware.org/ml/gdb-patches/2016-03/msg00487.html

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