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SubjectRe: [ANNOUNCE][RFC] trace-cmd - command line reader for ftrace


On Fri, 17 Jul 2009, Noah Watkins wrote:

> root@martini:~/Projects/trace-cmd# ./trace-cmd record -p function_graph ls /bin
> plugin function_graph
> bash bzip2recover dash dumpkeys gunzip login
> <... directory listing pruned ...>
> ntfs-3g.probe rm stty uname zforce
> *** glibc detected *** ./trace-cmd: malloc(): memory corruption (fast):

Was this on the trace-cmd record or report? If it was the record, do not
use function_graph with "optimize_for_size", there's a known issue on
x86_32 with that option that gcc breaks the function graph tracer.

Try one of the other trace plugins, and if you still have issues, let
me know. Also, I just updated the code, because I found a bug in the
reporting on 32bit archs.

-- Steve



> 0x09c70038 ***
> ======= Backtrace: =========
> /lib/tls/i686/cmov/libc.so.6[0xb7efa604]
> /lib/tls/i686/cmov/libc.so.6[0xb7efd5b6]
> /lib/tls/i686/cmov/libc.so.6(__libc_malloc+0x95)[0xb7efe9c5]
> ./trace-cmd[0x804948a]
> ./trace-cmd[0x804963f]
> ./trace-cmd[0x804b06e]
> ./trace-cmd[0x804b84f]
> /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5)[0xb7ea1775]
> ./trace-cmd[0x8049191]
> ======= Memory map: ========
> 08048000-08054000 r-xp 00000000 08:08 62598
> /home/nwatkins/Projects/trace-cmd/trace-cmd
> 08054000-08055000 r--p 0000b000 08:08 62598
> /home/nwatkins/Projects/trace-cmd/trace-cmd
> 08055000-08056000 rw-p 0000c000 08:08 62598
> /home/nwatkins/Projects/trace-cmd/trace-cmd
> 09c70000-09c91000 rw-p 00000000 00:00 0 [heap]
> b7d00000-b7d21000 rw-p 00000000 00:00 0
> b7d21000-b7e00000 ---p 00000000 00:00 0
> b7e8a000-b7e8b000 rw-p 00000000 00:00 0
> b7e8b000-b7fe7000 r-xp 00000000 08:07 6174 /lib/tls/i686/cmov/libc-2.9.so
> b7fe7000-b7fe8000 ---p 0015c000 08:07 6174 /lib/tls/i686/cmov/libc-2.9.so
> b7fe8000-b7fea000 r--p 0015c000 08:07 6174 /lib/tls/i686/cmov/libc-2.9.so
> b7fea000-b7feb000 rw-p 0015e000 08:07 6174 /lib/tls/i686/cmov/libc-2.9.so
> b7feb000-b7fee000 rw-p 00000000 00:00 0
> b7ff2000-b7fff000 r-xp 00000000 08:07 2596 /lib/libgcc_s.so.1
> b7fff000-b8000000 r--p 0000c000 08:07 2596 /lib/libgcc_s.so.1
> b8000000-b8001000 rw-p 0000d000 08:07 2596 /lib/libgcc_s.so.1
> b8001000-b8004000 rw-p 00000000 00:00 0
> b8004000-b8005000 r-xp 00000000 00:00 0 [vdso]
> b8005000-b8021000 r-xp 00000000 08:07 2554 /lib/ld-2.9.so
> b8021000-b8022000 r--p 0001b000 08:07 2554 /lib/ld-2.9.so
> b8022000-b8023000 rw-p 0001c000 08:07 2554 /lib/ld-2.9.so
> bfb81000-bfb96000 rw-p 00000000 00:00 0 [stack]
> Aborted
> root@martini:~/Projects/trace-cmd#
>
>


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