panic: rm_rlock: recursed on non-recursive rmlock mac_policy_rm _at_ /usr/src/sys/security/mac/mac_framework.c:198

 Hello,

I see following panic of 10.0-ALPHA3 r255906

(kgdb) #0  doadump (textdump=0) at pcpu.h:232
#1  0xc0521fb1 in db_dump (dummy=-1062244387, dummy2=0, dummy3=-1,
    dummy4=0xeb36b764 "") at /usr/src/sys/ddb/db_command.c:543
#2  0xc0521a77 in db_command (cmd_table=<value optimized out>)
    at /usr/src/sys/ddb/db_command.c:449
#3  0xc0521790 in db_command_loop () at /usr/src/sys/ddb/db_command.c:502
#4  0xc0524020 in db_trap (type=<value optimized out>, code=2)
    at /usr/src/sys/ddb/db_main.c:231
#5  0xc0af7738 in kdb_trap (type=<value optimized out>,
    code=<value optimized out>, tf=<value optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:654
#6  0xc0fa6d3f in trap (frame=<value optimized out>)
    at /usr/src/sys/i386/i386/trap.c:720
#7  0xc0f8fd5c in calltrap () at /usr/src/sys/i386/i386/exception.s:170
#8  0xc0af6fdd in kdb_enter (why=0xc1111a64 "panic",
    msg=<value optimized out>) at cpufunc.h:71
#9  0xc0abe363 in vpanic (fmt=<value optimized out>, ap=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:747
#10 0xc0abe21a in kassert_panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:642
#11 0xc0abb047 in _rm_rlock_debug (rm=0xc156e764,
    tracker=<value optimized out>) at /usr/src/sys/kern/kern_rmlock.c:640
#12 0xc0ceb0aa in mac_policy_slock_nosleep (tracker=<value optimized out>)
    at /usr/src/sys/security/mac/mac_framework.c:198
#13 0xc0cf22a8 in mac_priv_check (priv=490)
    at /usr/src/sys/security/mac/mac_priv.c:75
#14 0xc0aacc15 in priv_check_cred (cred=0xc6ece600, priv=490, flags=0)
    at /usr/src/sys/kern/kern_priv.c:88
#15 0xd010cdf0 in socket_check_bind (cred=0xc6ece600,
    so=<value optimized out>, solabel=0x0, sa=<value optimized out>)
    at /usr/src/sys/modules/mac_portacl/../../security/mac_portacl/mac_portacl.c:428
#16 0xc0cf4291 in mac_socket_check_bind (so=0xcf528d40)
    at /usr/src/sys/security/mac/mac_socket.c:325
#17 0xc0b41091 in kern_bindat (td=0xc778c930, dirfd=-100,
    fd=<value optimized out>, sa=0xffff)
    at /usr/src/sys/kern/uipc_syscalls.c:279
#18 0xc0b40ea4 in sys_bind (td=0x80, uap=<value optimized out>)
    at /usr/src/sys/kern/uipc_syscalls.c:297
#19 0xc0fa7a0e in syscall (frame=<value optimized out>) at subr_syscall.c:134
#20 0xc0f8fdf1 in Xint0x80_syscall ()
    at /usr/src/sys/i386/i386/exception.s:270
#21 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)


It easy to reproduce. Just kldload mac_portacl and /etc/rc.d/syslogd restart