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* [Bug server/31526] New: GDBServer crashes with an internal error cannot find "ymm0h"
@ 2024-03-21 23:31 wmessmer at microsoft dot com
2024-04-02 1:53 ` [Bug server/31526] " tromey at sourceware dot org
0 siblings, 1 reply; 2+ messages in thread
From: wmessmer at microsoft dot com @ 2024-03-21 23:31 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=31526
Bug ID: 31526
Summary: GDBServer crashes with an internal error cannot find
"ymm0h"
Product: gdb
Version: 14.1
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: server
Assignee: unassigned at sourceware dot org
Reporter: wmessmer at microsoft dot com
Target Milestone: ---
WinDbg recently added support for connecting to and debugging Linux processes
via gdbserver. On gdbserver 12.1, the connection works fine. On gdbserver
14.x, the initial connection results in an immediate internal error in
gdbserver claiming that it cannot find "ymm0h"
Looking through things, it appears that this is caused by the WinDbg plug-in
which provides this functionality inadvertently sending a "qSupported:" packet
without "xmlRegisters=..." after having sent one with
"xmlRegisters=aarch64,i386".
On 12.1, this clears x86_xcr0 of the AVX flag and causes utilization of a
target description without AVX registers (which largely works fine). On 14.x,
this does NOT clear x86_xcr0 of the AVX flag but still causes utilization of a
target description without AVX registers. The next time the plug-in sends a
packet across the RSP which involves register state read, gdbserver attempts to
read AVX registers and faults with the internal error because the target
description does not contain them.
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* [Bug server/31526] GDBServer crashes with an internal error cannot find "ymm0h"
2024-03-21 23:31 [Bug server/31526] New: GDBServer crashes with an internal error cannot find "ymm0h" wmessmer at microsoft dot com
@ 2024-04-02 1:53 ` tromey at sourceware dot org
0 siblings, 0 replies; 2+ messages in thread
From: tromey at sourceware dot org @ 2024-04-02 1:53 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=31526
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at sourceware dot org
--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
While I think it would be fine to fix this in gdbserver,
I tend to think that a session should only involve
a single qSupported, and that this is a bug in the client.
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2024-03-21 23:31 [Bug server/31526] New: GDBServer crashes with an internal error cannot find "ymm0h" wmessmer at microsoft dot com
2024-04-02 1:53 ` [Bug server/31526] " tromey at sourceware dot org
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