A significant delay observed between the syscalls entry point and start of the syscall when running `ls -Ri`

Issue

• ls -Ri takes too long to finish.
• ls -Ri takes 20 to 60 times longer than in the fast machines

Slow # time ls -Ri /path/to/dir >/dev/null
real    0m2.715s
user    0m0.039s
sys     0m2.663s

Fast # time ls -Ri /path/to/dir >/dev/null
real    0m0.094s
user    0m0.023s
sys     0m0.070s

• When analyzing traces we saw that in the slow machines there is a significant delay between the syscalls entry point and the start of the syscall:

xxxx-python-663424 [077] 5937352.986718: sys_enter_newlstat:   filename: 0x7f8f00392b40, statbuf: 0x7fff7d8e04d0
xxxx-python-663424 [077] 5937352.986844: funcgraph_entry:                   |  __x64_sys_newlstat() {

• While in the fast machines there is none:

xxxx-python-768887 [027] 5939143.807240: sys_enter_newlstat:   filename: 0x7f42a29d4b90, statbuf: 0x7ffd70340c50                                                                                                                   
xxxx-python-768887 [027] 5939143.807241: funcgraph_entry:                   |  __x64_sys_newlstat() {