This is a segfault case of ctracer with vmlinux(4.20.0-rc3).
I used ctracer as below and I found it.
How to fix it ?
In addition, how to get function names
associated with a struct (e.g. sock) using ctracer ?
I want to just see the function names.
Thanks,
Taeung
$ ls /home/taeung/workspace/ctracer_test/
ctracer_relay.c ctracer_relay.h linux.blacklist.cu Makefile
$ ctracer --version
v1.12
$ ctracer --src_dir /home/taeung/workspace/ctracer_test/ ./vmlinux
--cu_blacklist /usr/share/dwarves/runtime/linux.blacklist.cu sock
Segmentation fault (core dumped)
$ gdb ./vmlinux core
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Reading symbols from ./vmlinux...done.
warning: core file may not match specified executable file.
[New LWP 32667]
warning: .dynamic section for "/usr/local/lib/libdwarves_emit.so.1" is
not at the expected address (wrong library or version mismatch?)
warning: .dynamic section for
"/usr/local/lib/libdwarves_reorganize.so.1" is not at the expected
address (wrong library or version mismatch?)
warning: .dynamic section for "/usr/local/lib/libdwarves.so.1" is not at
the expected address (wrong library or version mismatch?)
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `ctracer ./vmlinux request_queue'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007fae49d3d445 in elf_symtab__new (name=0x0 <irq_stack_union>,
elf=0x0 <irq_stack_union>,
ehdr=0x0 <irq_stack_union>) at
/home/taeung/git/opensource/pahole/elf_symtab.c:43
43 if (symtab->syms == NULL)
(gdb) bt
#0 0x00007fae49d3d445 in elf_symtab__new (name=0x0 <irq_stack_union>,
elf=0x0 <irq_stack_union>,
ehdr=0x0 <irq_stack_union>) at
/home/taeung/git/opensource/pahole/elf_symtab.c:43
#1 0x000055d29a3c50a1 in ?? ()
#2 0xffffffff00000000 in ?? ()
#3 0x000055d29ab468e0 in ?? ()
#4 0x00007ffeb1c21530 in ?? ()
#5 0x00007fae49d288f1 in sysfs__sprintf_build_id (root_dir=0x0
<irq_stack_union>,
sbuild_id=0x0 <irq_stack_union>) at
/home/taeung/git/opensource/pahole/dwarves.c:1702
Backtrace stopped: frame did not save the PC
