I upgraded my 11.0-CURRENT machine to r258504 to get past the uma panic
that I stumbled across earlier.  Now I got this when I started upgrading

Unread portion of the kernel message buffer:

Fatal double fault:
eip = 0xc0b158e0
esp = 0xe4f62000
ebp = 0xe4f62010
cpuid = 0; apic id = 00
panic: double fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper(c113340c,2,10000000,c15a0cf0,c15a0ce8,...) at 
db_trace_self_wrapper+0x2d/frame 0xc15a0cb0
kdb_backtrace(c12f143f,0,c12f2aea,c15a0d6c,0,...) at kdb_backtrace+0x30/frame 
vpanic(c15a0d6c,c15a0d84,c0fc14fb,c12f2aea,0,...) at vpanic+0x11f/frame 
panic(c12f2aea,0,0,0,e4f62010,...) at panic+0x12/frame 0xc15a0d60
dblfault_handler() at dblfault_handler+0xab/frame 0xc15a0d60
--- trap 0x17, eip = 0xc0b158e0, esp = 0xe4f62000, ebp = 0xe4f62010 ---
vprintf(c12f2900,c,fffffe7f,fffffeff,bfff75ed,...) at vprintf/frame 0xe4f62010
trap(e4f62164) at trap+0x18a/frame 0xe4f62158
calltrap() at calltrap+0x6/frame 0xe4f62158
--- trap 0xc, eip = 0xc0b145dd, esp = 0xe4f621a4, ebp = 0xe4f62270 ---
kvprintf(c12f2900,c0b15210,e4f62290,a,e4f6235c,...) at kvprintf+0x1cd/frame 
vprintf(c12f2900,e4f6235c,e4f6235c) at vprintf+0x7f/frame 0xe4f6233c
printf(c12f2900,c,ffefdfff,ebefefff,dfdffedf,...) at printf+0x1b/frame 
trap(e4f624a4) at trap+0x18a/frame 0xe4f62498
calltrap() at calltrap+0x6/frame 0xe4f62498
--- trap 0xc, eip = 0xc0b145dd, esp = 0xe4f624e4, ebp = 0xe4f625b0 ---
kvprintf(c12f2900,c0b15210,e4f625d0,a,e4f6269c,...) at kvprintf+0x1cd/frame 
vprintf(c12f2900,e4f6269c,e4f6269c) at vprintf+0x7f/frame 0xe4f6267c
printf(c12f2900,c,5fd7ff5f,ba77f7fb,bfffb7ff,...) at printf+0x1b/frame 
trap(e4f627e4) at trap+0x18a/frame 0xe4f627d8
calltrap() at calltrap+0x6/frame 0xe4f627d8
--- trap 0xc, eip = 0xc0b145dd, esp = 0xe4f62824, ebp = 0xe4f628f0 ---
kvprintf(c12f2900,c0b15210,e4f62910,a,e4f629dc,...) at kvprintf+0x1cd/frame 
vprintf(c12f2900,e4f629dc,e4f629dc) at vprintf+0x7f/frame 0xe4f629bc
printf(c12f2900,c,0,80000000,c0,...) at printf+0x1b/frame 0xe4f629d0
trap(e4f62b20) at trap+0x18a/frame 0xe4f62b14
calltrap() at calltrap+0x6/frame 0xe4f62b14
--- trap 0xc, eip = 0xc0afe270, esp = 0xe4f62b60, ebp = 0xe4f62b78 ---
tdq_choose(c141e090,4,c113144d,917,c2425c80,...) at tdq_choose+0x60/frame 
sched_choose(e4f62c00,c0afc511,c141e090,14,c113144d,...) at 
sched_choose+0x4c/frame 0xe4f62ba4
choosethread(c141e090,14,c113144d,78b,c141e116,...) at choosethread+0x1f/frame 
sched_switch(c8f04000,0,608,1b7,ef2,...) at sched_switch+0x361/frame 0xe4f62c00
mi_switch(608,0,c112f4e4,d3,c,...) at mi_switch+0x1c9/frame 0xe4f62c34
critical_exit(0,2,c113144d,411,c141e108,...) at critical_exit+0xa4/frame 
sched_idletd(0,e4f62d08,c1128634,3db,0,...) at sched_idletd+0x1d6/frame 
fork_exit(c0afeb00,0,e4f62d08) at fork_exit+0x7f/frame 0xe4f62cf4
fork_trampoline() at fork_trampoline+0x8/frame 0xe4f62cf4
--- trap 0, eip = 0, esp = 0xe4f62d40, ebp = 0 ---
KDB: enter: panic

(kgdb) list *tdq_choose+0x60
0xc0afe270 is in tdq_choose (/usr/src/sys/kern/sched_ule.c:1334).
1329            td = runq_choose(&tdq->tdq_realtime);
1330            if (td != NULL)
1331                    return (td);
1332            td = runq_choose_from(&tdq->tdq_timeshare, tdq->tdq_ridx);
1333            if (td != NULL) {
1334                    KASSERT(td->td_priority >= PRI_MIN_BATCH,
1335                        ("tdq_choose: Invalid priority on timeshare queue 
1336                        td->td_priority));
1337                    return (td);
1338            }

(kgdb) bt
#0  doadump (textdump=-1051128300) at pcpu.h:233
#1  0xc052766d in db_fncall (dummy1=-1051051648, dummy2=0, dummy3=-1051063684, 
    dummy4=0xc15a0a54 "") at /usr/src/sys/ddb/db_command.c:578
#2  0xc0527357 in db_command (cmd_table=<value optimized out>)
    at /usr/src/sys/ddb/db_command.c:449
#3  0xc0527090 in db_command_loop () at /usr/src/sys/ddb/db_command.c:502
#4  0xc0529922 in db_trap (type=<value optimized out>, code=0)
    at /usr/src/sys/ddb/db_main.c:231
#5  0xc0b0ff38 in kdb_trap (type=<value optimized out>, 
    code=<value optimized out>, tf=<value optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:656
#6  0xc0fc0c07 in trap (frame=<value optimized out>)
    at /usr/src/sys/i386/i386/trap.c:712
#7  0xc0faa0ec in calltrap () at /usr/src/sys/i386/i386/exception.s:170
#8  0xc0b0f7bd in kdb_enter (why=0xc112ee39 "panic", msg=<value optimized out>)
    at cpufunc.h:71
#9  0xc0ad6a93 in vpanic (fmt=<value optimized out>, ap=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:747
#10 0xc0ad6ad2 in panic (fmt=0xc12f2aea "double fault")
    at /usr/src/sys/kern/kern_shutdown.c:683
#11 0xc0fc14fb in dblfault_handler () at /usr/src/sys/i386/i386/trap.c:1072
#12 0x00000000 in ?? ()

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