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${ noResults }
qemu/trace
QEMU binaries no longer launch successfully with recent SystemTap releases. This is because modular QEMU builds link the sdt semaphores into the main binary instead of into the shared objects where they are used. The symbol visibility of semaphores is 'hidden' and the dynamic linker prints an error during module loading: $ ./configure --enable-trace-backends=dtrace --enable-modules ... ... Failed to open module: /builddir/build/BUILD/qemu-4.2.0/s390x-softmmu/../block-curl.so: undefined symbol: qemu_curl_close_semaphore The long-term solution is to generate per-module dtrace .o files and link them into the module instead of the main binary. In the short term we can define STAP_SDT_V2 so dtrace(1) produces a .o file with 'default' symbol visibility instead of 'hidden'. This workaround is small and easier to merge for QEMU 5.2 and downstream backports. Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1898700 Cc: wcohen@redhat.com Cc: fche@redhat.com Cc: kraxel@redhat.com Cc: rjones@redhat.com Cc: ddepaula@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Miroslav Rezanina <mrezanin@redhat.com> Message-id: 20201119141457.844452-1-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> |
5 years ago | |
|---|---|---|
| .. | ||
| control-internal.h | trace: Do not include qom/cpu.h into generated trace.h | 7 years ago |
| control-target.c | trace: switch position of headers to what Meson requires | 6 years ago |
| control-vcpu.h | hw/core: Move cpu.c, cpu.h from qom/ to hw/core/ | 7 years ago |
| control.c | trace: remove argument from trace_init_file | 5 years ago |
| control.h | trace: remove argument from trace_init_file | 5 years ago |
| event-internal.h | trace: remove the TraceEventID and TraceEventVCPUID enums | 10 years ago |
| ftrace.c | trace: handle tracefs path truncation | 7 years ago |
| ftrace.h | Clean up decorations and whitespace around header guards | 10 years ago |
| mem-internal.h | trace: Remove trace_mem_build_info_no_se_[bl]e | 6 years ago |
| mem.h | trace: add mmu_index to mem_info | 7 years ago |
| meson.build | trace: use STAP_SDT_V2 to work around symbol visibility | 5 years ago |
| qmp.c | trace: Do not include qom/cpu.h into generated trace.h | 7 years ago |
| simple.c | trace/simple: Fix unauthorized enable | 6 years ago |
| simple.h | trace/simple: Fix unauthorized enable | 6 years ago |