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From: "dinc.tarkan at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/27627] New: GDB cannot get long threadinfo data over UDP
Date: Tue, 23 Mar 2021 08:05:25 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27627

            Bug ID: 27627
           Summary: GDB cannot get long threadinfo data over UDP
           Product: gdb
           Version: 9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: dinc.tarkan at gmail dot com
  Target Milestone: ---

I am using remote-target debugging and connected to target over UDP.
I have one process and 60 threads and every thread has 30 characters long n=
ame
and using a non-stop debug. So the thread info xml data is over 1kB.
gdb first ask for process info with "qXfer:osdata:read:processes:0,283"
Since the data is bigget than 643 (0x283) byte, the answer is "m<osdata
type=3D"processes">...". gdb understands the multiple packet format and con=
tinues
to ask for osdata information "qXfer:osdata:read:processes:283,283"
and so on until it receives the package startind with 'l'.
Later gdb asks for thread info "qXfer:thread:read::0,44b" and the answer is
"m<threads>...." but after that gdb stop asking the remaining thread info. =
The
xml data is incomplete and when it trys to parse the data, gdb terminates d=
ue
to an error.
I changed the connection type to TCP, nothing else changed and it works as
expected.

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