Our slurm epilog runs a script that cats the files

/proc/fs/lustre/ldlm/namespaces/*/lock_count
/proc/fs/lustre/ldlm/namespaces/*/lock_unused
/proc/fs/lustre/ldlm/namespaces/*/resource_count

One such cat process on a Lustre 2.1 client hit a GPF with the backtrace below.

machine_kexec
crash_kexec
oops_end
die
do_general_protection
general_protection
[exception RIP:lprocfs_rd_ns_locks+88]
lprocfs_fops_read
proc_reg_read
vfs_read
sys_read
system_call_fastpath

We have a crash dump for analysis on our classified network, so please let us know if there's any data structures you want to see.