[Bug 234846] [lagg] race condition when adding port

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234846

--- Comment #7 from Alexandre martins <alexandre.martins at stormshield.eu> ---
I have only the network thread, the ifconfig thread have its backtrace
truncated, but the td->td_proc show me that the command was "ifconfig lagg0
aggport em0"

The crash is due to the "lp_psc" field that is NULL into the "struct lagg_port"

There it is:

(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:219
#1  doadump (textdump=<optimized out>) at ../../../kern/kern_shutdown.c:298
#2  0xffffffff80459680 in kern_reboot (howto=260) at
../../../kern/kern_shutdown.c:486
#3  0xffffffff80459a25 in vpanic (fmt=<optimized out>, ap=<optimized out>) at
../../../kern/kern_shutdown.c:889

#4  0xffffffff804598f3 in panic (fmt=<unavailable>) at
../../../kern/kern_shutdown.c:818
#5  0xffffffff8067e848 in trap_fatal (frame=<optimized out>, eva=<optimized
out>) at ../../../amd64/amd64/trap.c:858

#6  0xffffffff8067ec27 in trap_pfault (frame=<unavailable>, usermode=<optimized
out>) at 
../../../amd64/amd64/trap.c:713
#7  0xffffffff8067e24a in trap (frame=0xfffffe0d900b4630) at
../../../amd64/amd64/trap.c:447
#8  <signal handler called>
#9  lacp_iscollecting (lgp=0xfffff80572adbe00) at
../../../net/ieee8023ad_lacp.h:324
#10 lagg_lacp_input (sc=<optimized out>, lp=0xfffff80572adbe00, m=<optimized
out>) at ../../../net/if_lagg.c:2176

#11 0xffffffff80521155 in lagg_proto_input (sc=<optimized out>, m=<optimized
out>, sc=<optimized 
out>, lp=<optimized out>, m=<optimized out>) at ../../../net/if_lagg.c:362
#12 lagg_input (ifp=0xfffff8034bfc3800, m=0xfffff8065cb60a00) at
../../../net/if_lagg.c:1667
#13 0xffffffff8051d555 in ether_input (ifp=0xfffff8034bfc3800,
m=0xfffff8065cb60a00) at ../../../net/if_ethersubr.c:794

#14 0xffffffff8052d0fa in pollif_recv () at ../../../net/netisr_pollif.c:529
#15 0xffffffff8052c7a5 in swi_net (arg=0xfffffe10ca797880) at
../../../net/netisr.c:824
#16 0xffffffff8042fe5b in intr_event_execute_handlers (p=<optimized out>,
ie=0xfffff8034bf12a00) 
at ../../../kern/kern_intr.c:1297
#17 0xffffffff80430456 in ithread_execute_handlers (ie=<optimized out>,
p=<optimized out>) 
at ../../../kern/kern_intr.c:1310
#18 ithread_loop (arg=0xfffff8034befd7c0) at ../../../kern/kern_intr.c:1394
#19 0xffffffff8042d595 in fork_exit (callout=0xffffffff804303c0 <ithread_loop>,
arg=0xfffff8034befd7c0, 
frame=0xfffffe0d900b49c0) at ../../../kern/kern_fork.c:1027
#20 <signal handler called>

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