df43xx[4]: DF-4350: cyclic FWD chain 6->7->6 (slots 0,1 ACTIVE). Shipped kernel: revisit double-completes slot 0 -> panic. DF-4349-fixed kernel: entries dropped, walk NEVER terminates (livelock). Both-fixed: budget break.
panic: Bad link elm 0xfffff8008f994ac0 prev->next != elm
cpuid = 3
Trace beginning at frame 0xfffff80116a7e638
adv_done() at adv_done+0x3ae 0xffffffff802e683e 
adv_done() at adv_done+0x3ae 0xffffffff802e683e 
adv_intr() at adv_intr+0x10f 0xffffffff802e69ff 
df43xx_go_sysctl() at df43xx_go_sysctl+0x1103 0xffffffff82601cd3 
sysctl_root.isra.5() at sysctl_root.isra.5+0x166 0xffffffff80683d06 
userland_sysctl() at userland_sysctl+0x111 0xffffffff806840a1 
Debugger("panic")

CPU3 stopping CPUs: 0x00000037
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>