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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Nov 2023 16:40:33.5289 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 76356250-5e49-46c7-8afb-08dbeab094d6 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DU6PEPF00009527.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB9362 X-Spam-Status: No, score=-6.3 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 11/14/23 15:09, Simon Marchi wrote: > On 11/13/23 10:26, Tom de Vries wrote: >> On a pinebook (aarch64 with 64-bit kernel and 32-bit userland) with test-case >> gdb.base/gdb-sigterm.exp I run into: >> ... >> intrusive_list.h:458: internal-error: erase_element: \ >> Assertion `elem_node->prev != INTRUSIVE_LIST_UNLINKED_VALUE' failed.^M >> ... >> >> Fix this similar to: >> - commit c0afd99439f ("[gdb/tui] Fix assert in ~gdbpy_tui_window_maker"), and >> - commit 995a34b1772 ("Guard against frame.c destructors running before >> frame-info.c's" >> by checking is_linked () before attempting to remove from breakpoint_chain. >> >> Tested on the pinebook and x86_64-linux. >> >> PR gdb/31061 >> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31061 > > Hi Tom, > > Did you dig a little bit to understand why this happened specifically > with this setup, and that it's indeed expected that the breakpoint is > not in the breakpoint chain? The stack trace you showed contains (with > names demangled): > > 0xaae1d42b delete_breakpoint(breakpoint*)^M > /home/rock/gdb/src/gdb/breakpoint.c:12636^M > 0xab1ed045 delete_thread_breakpoint^M > /home/rock/gdb/src/gdb/thread.c:98^M > 0xab1ed0ab delete_single_step_breakpoints(thread_info*)^M > /home/rock/gdb/src/gdb/thread.c:123^M > 0xab021e81 delete_thread_infrun_breakpoints^M > /home/rock/gdb/src/gdb/infrun.c:3733^M > 0xab021edd for_each_just_stopped_thread^M > /home/rock/gdb/src/gdb/infrun.c:3752^M > 0xab021f79 delete_just_stopped_threads_infrun_breakpoints^M > /home/rock/gdb/src/gdb/infrun.c:3768^M > > It looks like this is specific to architectures that use software > single stepping? Does "32-bit userland on 64-bit kernel on aarch64" use > software single stepping, like 32-bit ARM? Given AArch64 supports hardware single-stepping, I'd expect 32-bit userspace running on 64-bit Linux Kernel to also support it.