Every time I do "nginx -s reload" I see a process:

nginx: worker process is shutting down

This process never stops even after a long time.

Any idea what cause this issue?

From truss (similar to strace):

kevent(13,{},0,{},512,{0.602000000 }) = 0 (0x0)
kevent(13,{},0,{},512,{3.000000000 }) = 0 (0x0)
kevent(13,{},0,{0xc,EVFILT_READ,0x0,0,0x20,0x802530068},512,{3.000000000 }) = 1 (0x1)
recvmsg(0xc,0x7fffffffe5a0,0x0,0x80248d068,0xffffffff,0x0) = 32 (0x20)
recvmsg(0xc,0x7fffffffe5a0,0x0,0x80248d068,0xffff,0x0) ERR#35 'Resource temporarily unavailable'
kevent(13,{},0,{0xc,EVFILT_READ,0x0,0,0x20,0x802530068},512,{1.287000000 }) = 1 (0x1)
recvmsg(0xc,0x7fffffffe5a0,0x0,0x80248d068,0xffffffff,0x7fffffffe678) = 32 (0x20)
recvmsg(0xc,0x7fffffffe5a0,0x0,0x80248d068,0xffff,0x7fffffffe678) ERR#35 'Resource temporarily unavailable'
kevent(13,{},0,{0xc,EVFILT_READ,0x0,0,0x20,0x802530068},512,{1.286000000 }) = 1 (0x1)
recvmsg(0xc,0x7fffffffe5a0,0x0,0x80248d068,0xffffffff,0x7fffffffe678) = 32 (0x20)
recvmsg(0xc,0x7fffffffe5a0,0x0,0x80248d068,0xffffffff,0x7fffffffe678) ERR#35 'Resource temporarily unavailable'
getpid() = 9230 (0x240e)
__sysctl(0x7fffffffe690,0x4,0x0,0x0,0x802451000,0x27) = 0 (0x0)
close(5) = 0 (0x0)
kevent(13,{},0,{0xc,EVFILT_READ,0x0,0,0x20,0x802530068},512,{1.180000000 }) = 1 (0x1)
recvmsg(0xc,0x7fffffffe5a0,0x0,0x80248d068,0xffffffff,0x7fffffffe678) = 32 (0x20)
close(4) = 0 (0x0)
recvmsg(0xc,0x7fffffffe5a0,0x0,0x80248d068,0xffffffff,0x7fffffffe678) ERR#35 'Resource temporarily unavailable'
kevent(13,{},0,{},512,{1.180000000 }) = 0 (0x0)
kevent(13,{},0,{},512,{3.000000000 }) = 0 (0x0)
kevent(13,{},0,{},512,{3.000000000 }) = 0 (0x0)
kevent(13,{},0,{},512,{3.000000000 }) = 0 (0x0)
kevent(13,{},0,{},512,{3.000000000 }) = 0 (0x0)
kevent(13,{},0,{},512,{3.000000000 }) = 0 (0x0)
kevent(13,{},0,{},512,{3.000000000 }) = 0 (0x0)

It keeps looping with: kevent(13,{},0,{},512,{3.000000000 }) = 0 (0x0)

And lsof:

nginx 9230 www cwd VDIR 0,142 512 823526 /usr/ports/www/nginx-devel
nginx 9230 www rtd VDIR 0,138 512 2 /
nginx 9230 www txt VREG 0,142 774696 160619 /usr (/dev/mirror/gm0p6)
nginx 9230 www txt VREG 0,138 128312 20 /libexec/ld-elf.so.1
nginx 9230 www txt VREG 0,138 102472 240934 /lib/libthr.so.3
nginx 9230 www txt VREG 0,138 62040 240920 /lib/libcrypt.so.5
nginx 9230 www txt VREG 0,142 480888 1766349 /usr/local/lib/libpcre.so.1.2.5
nginx 9230 www txt VREG 0,142 529223 1765851 /usr/local/lib/libssl.so.8
nginx 9230 www txt VREG 0,142 2716684 1765720 /usr/local/lib/libcrypto.so.8
nginx 9230 www txt VREG 0,138 89584 240937 /lib/libz.so.6
nginx 9230 www txt VREG 0,142 279168 1766158 /usr/local/lib/libGeoIP.so.1.6.6
nginx 9230 www txt VREG 0,138 1642936 240860 /lib/libc.so.7
nginx 9230 www 0u VCHR 0,11 0t0 11 /dev/null
nginx 9230 www 1u VCHR 0,11 0t0 11 /dev/null
nginx 9230 www 2u VCHR 0,169 0t45 169 /dev/pts/0
nginx 9230 www 3u unix 0xfffff80069985000 0t0 ->0xfffff800698e2828
nginx 9230 www 6u unix 0xfffff8017f141000 0t0 ->0xfffff8017f141570
nginx 9230 www 7u unix 0xfffff8017f1662b8 0t0 ->0xfffff80069271000
nginx 9230 www 11w VREG 0,141 1146 1444622 /var (/dev/mirror/gm0p5)
nginx 9230 www 12u unix 0xfffff8017f26a570 0t0 ->0xfffff80069987000
nginx 9230 www 13u KQUEUE 0xfffff8000e5b4500 count=0, state=0x2
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