[Bug runtime/26673] New: The kernel backtrace dumper should not use stack array which may lead to compilation errors

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26673

            Bug ID: 26673
           Summary: The kernel backtrace dumper should not use stack array
                    which may lead to compilation errors
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

Consider the following example when using a MAXBACKTRACE macro value larger
than 60 and the kernel backtrace dumper in the stap runtime, it will lead to
compilation errors due to the on-stack array "entries" in the function of the
stap runt

```
$ /opt/stap/bin/stap -DMAXBACKTRACE=61 -e 'probe begin { print_backtrace() }'
In file included from
/tmp/stapy7pTmc/stap_ec9093ee0dc3ecaa0481bbf9075a06bf_1049_src.c:79:
/opt/stap/share/systemtap/runtime/stack.c: In function
‘_stp_stack_print_fallback.isra.33.constprop’:
/opt/stap/share/systemtap/runtime/stack.c:235:1: error: the frame size of 520
bytes is larger than 512 bytes [-Werror=frame-larger-than=]
 }
 ^
cc1: all warnings being treated as errors
make[1]: *** [scripts/Makefile.build:276:
/tmp/stapy7pTmc/stap_ec9093ee0dc3ecaa0481bbf9075a06bf_1049_src.o] Error 1
make: *** [Makefile:1581: _module_/tmp/stapy7pTmc] Error 2
WARNING: kbuild exited with status: 2
Pass 4: compilation failed.  [man error::pass4]
```

-- 
You are receiving this mail because:
You are the assignee for the bug.