HEADS UP - massive kqueue changes now in HEAD, and also basic lvm/dm

[YONETANI Tomokazu]

On Mon, Jul 26, 2010 at 06:04:00PM -0600, Samuel J. Greear wrote:
> I've pushed some fixes into master,
> 
> Commit 0f2e13efc9137bb21562ef4093049fd044651429 should fix the screen issue.

I updated the kernel with the latest source (the world has been installed
from the source as of 4cc93e2d), but I'm afraid it doesn't fix the issue.
Here's how you compile GNU screen from git master, by the way:

$ git clone git://git.sv.gnu.org/screen.git
$ cd screen.git/src
$ autoreconf && ./configure && gmake && ./screen
(and press ctrl+D or type `exit' followed by Enter key)

An window still takes about 10-seconds before closing if it was running
a shell.  The shell process itself is terminated right after pressing
ctrl+D, according to the output from ps command.  Bisecting revealed that
the first commit in GNU screen which takes longer to close a shell window
on a recent DragonFly kernel is:
  http://git.savannah.gnu.org/cgit/screen.git/commit/?id=33b7c9ca


I also noticed that issuing shutdown command from within screen triggers
a kernel panic, if it proceeds within the 10-seconds delay.  I don't use a
special CFLAGS to build the kernel, and I use gcc4.1 (no CCVER specified).

Fatal trap 12: page fault while in kernel mode
mp_lock = 00000001; cpuid = 1; lapic.id = 01000000
fault virtual address   = 0
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0x0
stack pointer           = 0x10:0xd3686a80
frame pointer           = 0x10:0xd3686aa8
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 4436 (screen)
current thread          = pri 38 (CRIT)
 <- SMP: XXX
trap number             = 12
panic: page fault
mp_lock = 00000001; cpuid = 1
Trace beginning at frame 0xd3686980
panic(ffffffff) at panic+0x14f
panic(c0332c96,c0345fcc,0,0,fffff) at panic+0x14f
trap_fatal(0,0,cfaf7310,d274b650,c) at trap_fatal+0x31d
trap_pfault(26,0,0,d3a51f28,d25363d0) at trap_pfault+0xff
trap(d3686a38) at trap+0x7a0
calltrap() at calltrap+0xd
--- trap 0, eip = 0, esp = 0xd3686a7c, ebp = 0xd274b650 ---
(null)(0,cfaac418,0,cc476400,0) at 0
CPU_prvspace() at CPU_prvspace+0x8054
boot() called on cpu#1
Uptime: 20m42s
#0  _get_mycpu (di=0xc042b2a0) at ./machine/thread.h:83
#1  md_dumpsys (di=0xc042b2a0)
    at /usr/src/sys/platform/pc32/i386/dump_machdep.c:263
#2  0xc01a24a1 in dumpsys () at /usr/src/sys/kern/kern_shutdown.c:839
#3  0xc01a2a73 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:388
#4  0xc01a2fd6 in panic (fmt=0xc0332c96 "%s")
    at /usr/src/sys/kern/kern_shutdown.c:745
#5  0xc030611d in trap_fatal (frame=0xd3686a38, eva=<value optimized out>)
    at /usr/src/sys/platform/pc32/i386/trap.c:1125
#6  0xc030622e in trap_pfault (frame=0xd3686a38, usermode=0, eva=0)
    at /usr/src/sys/platform/pc32/i386/trap.c:1026
#7  0xc03076e8 in trap (frame=0xd3686a38)
    at /usr/src/sys/platform/pc32/i386/trap.c:713
#8  0xc02f2427 in calltrap ()
    at /usr/src/sys/platform/pc32/i386/exception.s:785
#9  0x00000000 in ?? ()