Hi Brian,
thanks! I'll take a look at these and see if I can get any ideas from them.
To go back to your original e-mail, a detail that I hadn't noticed in
your original backtrace was pointed out to me and I'd like to verify
with you:
```
Core was generated by `./my_app'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 __strlen_asimd () at ../sysdeps/aarch64/multiarch/strlen_asimd.S:96
96 ../sysdeps/aarch64/multiarch/strlen_asimd.S: No such file or
directory.
[Current thread is 1 (Thread 0xffffb8e2d040 (LWP 757))]
(gdb) bt
#0 __strlen_asimd () at ../sysdeps/aarch64/multiarch/strlen_asimd.S:96
#1 0x0000ffffb86c5330 in lttng_ust_tracepoint_module_register () from
/usr/lib/liblttng-ust-tracepoint.so.1
#2 0x0000aaaab4c8da18 in lttng_ust__tracepoints__ptrs_init () at
/opt/poky/4.0.18/sysroots/cortexa53-crypto-poky-linux/usr/include/lttng/tracepoint.h:629
#3 0x0000ffffb872b30c in call_init (env=<optimized out>,
argv=0xffffe2d66098, argc=1) at ../csu/libc-start.c:145
#4 __libc_start_main_impl (main=0xaaaab4bd94e0 <main>, argc=1,
argv=0xffffe2d66098, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=<optimized out>) at
../csu/libc-start.c:376
#5 0x0000aaaab4bd9230 in _start () at ../sysdeps/aarch64/start.S:81
```
The library loaded at frame 1 is
`/usr/lib/liblttng-ust-tracepoint.so.1`; however, in frame 2 the
reference is from
`/opt/poky/4.0.18/sysroots/cortexa53-crypto-poky-linux/usr/include/lttng/tracepoint.h`.
Are the LTTng libraries in `/usr/lib` the exact same version as the
headers in
`/opt/poky/4.0.18/sysroots/cortexa53-cryptop-poky-linux/usr/include/lttng`?
If some of your app is compiled using one version of headers and a
different version of the library is loaded at runtime, there could be an
ABI mismatch.
You could check what the include paths are during compilation and
`LD_LIBRARY_PATH` at runtime. Running with the environment variable
`LD_DEBUG=bindings,libs` (see `man ld.so` for more info).
In any case, I'll take a look over the most recent backtraces and see if
anything else jumps out.
thanks,
kienan
On 7/16/24 9:27 PM, Brian Hutchinson wrote:
Hi Kienan,
On Thu, Jul 11, 2024 at 8:38 AM Kienan Stewart <kstew...@efficios.com
<mailto:kstew...@efficios.com>> wrote:
Hi Brian,
On 7/11/24 8:33 AM, Brian Hutchinson via lttng-dev wrote:
> ...
>
> I'm not sure about this, still trying to comprehend everything,
but I
> think my issue could be related to all this gcc TLS, heap,
trampoline
> talk here:
>
>
https://www.mail-archive.com/lttng-dev@lists.lttng.org/msg13584.html
<https://www.mail-archive.com/lttng-dev@lists.lttng.org/msg13584.html>
>
<https://www.mail-archive.com/lttng-dev@lists.lttng.org/msg13584.html
<https://www.mail-archive.com/lttng-dev@lists.lttng.org/msg13584.html>>
>
> Regards,
>
> Brian
>
You could try using lttng-ust 2.13.8, which includes a fix for the
discussion you referenced.
https://github.com/lttng/lttng-ust/commit/5db715e800d9b721f48495a987cd26c25965e836
<https://github.com/lttng/lttng-ust/commit/5db715e800d9b721f48495a987cd26c25965e836>
Please let us know if it doesn't solve it.
thanks,
kienan
I updated to lttng-ust 2.13.8 as you suggested. At first, I pulled in
the recipe from master branch of Yocto, but had the same problem as
before after rebuilding.
Next, I downloaded the 2.13.8 lttng-ust tarball from the lttng site and
setup a native build environment on my target and built lttng-ust 2.13.8
and my app as a second independent build method for sanity check. I can
report that I get the exact same result as before this way too.
In both cases, I verified that I had the commit you referenced above.
I did a backtrace of the three threads captured in the coredump and show
them below in hopes it will shed light on what I need to try next.
(gdb) thread apply all backtrace
Thread 3 (Thread 0xffffbe7de7e0 (LWP 559)):
#0 syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1 0x0000ffffbeef1bb8 in lttng_ust_futex (val3=0, uaddr2=0x0,
timeout=0x0, val=0, op=0, uaddr=0xffffbefd8000) at
../../../src/lib/lttng-ust/futex.h:56
#2 lttng_ust_futex_async (op=0, val=0, timeout=0x0, uaddr2=0x0, val3=0,
uaddr=0xffffbefd8000) at ../../../src/lib/lttng-ust/futex.h:88
#3 wait_for_sessiond (sock_info=0xffffbef6b638 <global_apps>) at
lttng-ust-comm.c:1761
#4 ust_listener_thread (arg=0xffffbef6b638 <global_apps>) at
lttng-ust-comm.c:1832
#5 0x0000ffffbe9206a8 in start_thread (arg=0xffffc1bd8687) at
pthread_create.c:442
#6 0x0000ffffbe98801c in thread_start () at
../sysdeps/unix/sysv/linux/aarch64/clone.S:79
Thread 2 (Thread 0xffffbdfce7e0 (LWP 560)):
#0 syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1 0x0000ffffbeef1bb8 in lttng_ust_futex (val3=0, uaddr2=0x0,
timeout=0x0, val=0, op=0, uaddr=0xffffbefd7000) at
../../../src/lib/lttng-ust/futex.h:56
#2 lttng_ust_futex_async (op=0, val=0, timeout=0x0, uaddr2=0x0, val3=0,
uaddr=0xffffbefd7000) at ../../../src/lib/lttng-ust/futex.h:88
#3 wait_for_sessiond (sock_info=0xffffbef695e0 <local_apps>) at
lttng-ust-comm.c:1761
#4 ust_listener_thread (arg=0xffffbef695e0 <local_apps>) at
lttng-ust-comm.c:1832
#5 0x0000ffffbe9206a8 in start_thread (arg=0xffffc1bd8687) at
pthread_create.c:442
#6 0x0000ffffbe98801c in thread_start () at
../sysdeps/unix/sysv/linux/aarch64/clone.S:79
Thread 1 (Thread 0xffffbefcf460 (LWP 545)):
#0 __strlen_asimd () at ../sysdeps/aarch64/multiarch/strlen_asimd.S:96
#1 0x0000ffffbe834bd0 in lttng_ust_tp_validate_event_name
(tp=0xaaaab8f14de0
<lttng_ust_tracepoint_hello_world___my_first_tracepoint>,
tp=0xaaaab8f14de0
<lttng_ust_tracepoint_hello_world___my_first_tracepoint>) at
tracepoint.c:143
#2 add_callsite (tp=0xaaaab8f14de0
<lttng_ust_tracepoint_hello_world___my_first_tracepoint>,
lib=0xaaaae74fad30) at tracepoint.c:412
#3 lib_register_callsites (lib=0xaaaae74fad30) at tracepoint.c:552
#4 lttng_ust_tracepoint_module_register (tracepoints_start=<optimized
out>, tracepoints_count=<optimized out>) at tracepoint.c:956
#5 0x0000aaaab8758204 in lttng_ust.tracepoints.ptrs_init ()
#6 0x0000ffffbe8cb30c in call_init (env=<optimized out>,
argv=0xffffc1bd8c88, argc=1) at ../csu/libc-start.c:145
#7 __libc_start_main_impl (main=0xaaaab867aabc <main>, argc=1,
argv=0xffffc1bd8c88, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=<optimized out>) at
../csu/libc-start.c:376
#8 0x0000aaaab867a7f0 in _start () at ../sysdeps/aarch64/start.S:81
Regards,
Brian
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