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# ./bin/cephfs-journal-tool --rank=a:0 event

It will crash:

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `./bin/cephfs-journal-tool --rank=a:0 event'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fd38c3cdd05 in raise () from /lib64/libpthread.so.0
[Current thread is 1 (Thread 0x7fd38bd2dc80 (LWP 14077))]
Missing separate debuginfos, use: dnf debuginfo-install fmt-5.2.1-2.fc30.x86_64 glibc-2.29-9.fc30.x86_64 gperftools-libs-2.7-5.fc30.x86_64 libblkid-2.33.2-2.fc30.x86_64 libgcc-9.2.1-1.fc30.x86_64 libibverbs-20.1-3.fc30.x86_64 libnl3-3.4.0-8.fc30.x86_64 librdmacm-20.1-3.fc30.x86_64 libstdc++-9.2.1-1.fc30.x86_64 libunwind-1.3.1-2.fc30.x86_64 libuuid-2.33.2-2.fc30.x86_64 lttng-ust-2.10.2-2.fc30.x86_64 openssl-libs-1.1.1d-2.fc30.x86_64 systemd-libs-241-12.git323cdf4.fc30.x86_64 userspace-rcu-0.10.1-5.fc30.x86_64 zlib-1.2.11-15.fc30.x86_64
(gdb) 
(gdb) bt
#0  0x00007fd38c3cdd05 in raise () from /lib64/libpthread.so.0
#1  0x0000559ef43e192e in reraise_fatal (signum=11) at /data1/ceph/src/global/signal_handler.cc:81
#2  0x0000559ef43e29f3 in handle_fatal_signal (signum=11) at /data1/ceph/src/global/signal_handler.cc:326
#3  <signal handler called>
#4  0x0000559ef3d642f0 in JournalTool::main_event (this=0x7ffcafbb9d10, argv=std::vector of length 0, capacity 0) at /data1/ceph/src/tools/cephfs/JournalTool.cc:372
#5  0x0000559ef3d61fcf in JournalTool::main (this=0x7ffcafbb9d10, argv=std::vector of length 0, capacity 2) at /data1/ceph/src/tools/cephfs/JournalTool.cc:181
#6  0x0000559ef3d5c2fa in main (argc=3, argv=0x7ffcafbba078) at /data1/ceph/src/tools/cephfs/cephfs-journal-tool.cc:51