df5415: production fw_kqfilter with d->ir=NULL, offsetof(fw_xferq, rkq)=152 -- expect Fatal trap 12 at ~0x98 in fw_kqfilter (fwdev.c:739/740)
panic: assertion "kn->kn_status & KN_PROCESSING" failed in knote_insert at /usr/src/sys/kern/kern_event.c:1890
cpuid = 4
Trace beginning at frame 0xfffff80116e7e638
knote_insert() at knote_insert+0x5a 0xffffffff8063c8da 
knote_insert() at knote_insert+0x5a 0xffffffff8063c8da 
fw_kqfilter() at fw_kqfilter+0x8e 0xffffffff8260069e 
df5413_fire_sysctl() at df5413_fire_sysctl+0x176 0xffffffff826051c6 
sysctl_root.isra.5() at sysctl_root.isra.5+0x166 0xffffffff80683d06 
userland_sysctl() at userland_sysctl+0x111 0xffffffff806840a1 
Debugger("panic")

CPU4 stopping CPUs: 0x0000002f
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>