uftrace stucks on termux execution

[honggyukim]

uftrace gets stuck when running inside termux on my phone as follows.

~ $ uftrace --force -vvv pwd
uftrace: running uftrace v0.17 ( aarch64 dwarf python3 luajit tui perf sched dynamic )
uftrace: checking binary /data/data/com.termux/files/usr/bin/pwd
uftrace: skipping perf event due to error: Permission denied
uftrace: please check /proc/sys/kernel/perf_event_paranoid
uftrace: creating 2 thread(s) for recording
uftrace: using /data/data/com.termux/files/usr/lib/libmcount.so library for tracing
uftrace: start writer thread 0
uftrace: start writer thread 1
(... no more progress ...)

[namhyung]

It'd be great if you can bisect.

[honggyukim]

I just tested it with pkg install uftrace so not sure if I can easily build and test multiple times.

[honggyukim]

It is very weird that the pkg installed uftrace is v0.17

$ uftrace --version
uftrace v0.17 ( aarch64 dwarf python3 luajit tui perf sched dynamic )

However, if I build and run the same uftrace, then it works fine.

$ uftrace --version
uftrace v0.17 ( aarch64 dwarf python3 luajit tui perf sched dynamic )

$ uftrace --force -D1 pwd
/data/data/com.termux/files/home/uftrace
# DURATION     TID      FUNCTION
            [  23343] | __libc_init() {

uftrace stopped tracing with remaining functions
================================================
task: 23343
[0] __libc_init

There must be some differences that uftrace --version doesn't show.