On an old Tyan Tomcat P200 running as a diskless bridge,
we tried unpatched 2.4.21.  A few seconds after boot:

# kernel BUG at dev.c:991!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c02adfa3>]    Not tainted
EFLAGS: 00010212
eax: 00010001   ebx: c10dfda0   ecx: 36b8c947   edx: 0000002e
esi: 0000ffff   edi: c3e7e030   ebp: c3c55800   esp: c03f5e20
ds: 0018   es: 0018   ss: 0018
Process swapper (pid: 0, stackpage=c03f5000)
Stack: c10dfda0 c03ad840 c3ed15c0 c02ae08a c10dfda0 00000000 00000246 c012c631
        c039ae30 c10dfda0 00000000 c031346f c10dfda0 c10dfda0 c0313496 c10dfda0
        c031396b c10dfda0 c10dfda0 c3e5e000 00000000 51eb815f 00000000 c3e92960
Call Trace:    [<c02ae08a>] [<c012c631>] [<c031346f>] [<c0313496>] [<c031369b>]
   [<c03136f9>] [<c0313500>] [<c0313ea8>] [<c0314009>] [<c02ae639>] [<c0316100>]
   [<c0316100>] [<c0314f58>] [<c02ae763>] [<c02ae88c>] [<c0109dca>] [<c01192e3>]
   [<c0109f7c>] [<c0106e40>] [<c010c3d8>] [<c0106e40>] [<c0106e64>] [<c0106ed2>]
   [<c0105000>]
Code: 0f 0b df 03 e3 5a 38 c0 89 c8 c1 e1 10 25 00 00 ff ff 01 c8
  <0>Kernel panic: Aiee, killing interrupt handler!
In interrupt handler - not syncing

Caps lock and Scroll lock blinking