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fce9a2 |
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fce9a2 |
Fix the extension trace.so for RHEL7.6, which moved
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ftrace_event_call.data into an anonymous union, and the
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previous offset has changed, so the trace.so extension
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module fails to load, indicating "no commands registered:
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shared object unloaded".
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fce9a2 |
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--- crash-trace-command-2.0/trace.c.orig
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+++ crash-trace-command-2.0/trace.c
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@@ -853,8 +853,18 @@ static int syscall_get_enter_fields(ulon
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inited = 1;
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data_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "data"),
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MEMBER_OFFSET("trace_event_call", "data"));
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- if (data_offset < 0)
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- return -1;
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+ if (data_offset < 0) {
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+ /*
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+ * rhel-7.6 moved the .data member into an anonymous union.
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+ */
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+ if (MEMBER_EXISTS("ftrace_event_call", "rh_data") &&
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+ MEMBER_EXISTS("ftrace_event_data", "data")) {
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+ data_offset = MEMBER_OFFSET("ftrace_event_call", "rh_data") +
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+ MEMBER_OFFSET("ftrace_event_data", "data");
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+ inited = 2;
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+ } else
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+ return -1;
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+ }
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enter_fields_offset = MEMBER_OFFSET("syscall_metadata", "enter_fields");
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if (enter_fields_offset < 0)
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@@ -868,6 +878,12 @@ work:
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"read ftrace_event_call data", RETURN_ON_ERROR))
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return -1;
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+ if (inited == 2) {
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+ if (!readmem(metadata, KVADDR, &metadata, sizeof(metadata),
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+ "read ftrace_event_call data (indirect rh_data)", RETURN_ON_ERROR))
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+ return -1;
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+ }
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+
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*fields = metadata + enter_fields_offset;
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return 0;
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}
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