On Sun, Jun 18, 2017 at 06:20:20AM -0400, Tejun Heo wrote: > If you "cd /sys/kernel/debug/tracing; cd -" before doing the find, > does it succeed the first time? It could be that the on-demand > mounting of tracefs is giving incoherent results across the mounting > and confusing find. Yes, that works fine: root@testvm:~# cd /sys/kernel/debug/tracing; cd - /root root@testvm:~# find /sys -name uuid /sys/devices/virtual/nvme-fabrics/ctl/nvme3/nvme3n1/uuid /sys/devices/virtual/nvme-fabrics/ctl/nvme2/nvme2n1/uuid