[root@www ~]# procstat -kk 32246
  PID    TID COMM             TDNAME           KSTACK
32246 101658 httpd            -                mi_switch+0x16f sleepq_catch_signals+0x31f
 sleepq_wait_sig+0xc _sleep+0x26b lf_advlockasync+0xf2e lf_advlock+0x47 vop_stdadvlock+0xb3
 kern_fcntl+0xd47 fcntl+0x3b syscall+0x246 Xfast_syscall+0xe1