On Tue, 19 Nov 2024 15:24:00 +0100 Jean-Michel Hautbois <[email protected]> wrote:
> Indeed printf gave me clues ! > It appears to be a bug in libtracefs (v1.8.1). rtla segfaults when > calling tracefs_local_events() in trace_instance_init(). > > Debugging libtracefs pointed me to the load_events() function, and the > segfault happens after tep_parse_event() is called for > "/sys/kernel/debug/tracing/events/vmscan/mm_vmscan_write_folio/format". > > Going through the calls I get to event_read_print_args(). > I changed libtraceevent log level to get the warnings, and it says: > libtraceevent: Resource temporarily unavailable > unknown op '.' > Segmentation fault Can you do me a favor and send me privately a tarball of: # cp -r /sys/kernel/tracing/events /tmp/events # cd /tmp # tar -cvjf events.tar.bz2 events You can't call tar on the /sys/kernel/tracing files as those are pseudo files with size of zero, and tar will just record empty files :-p -- Steve
