linuxolator: fatal trap 12 when compiling libX11

[Scot Hetzel]

On 1/16/07, Alexander Leidinger <Alexander at leidinger.net> wrote:
> Please compile with debug symbols ("makeoptions     DEBUG=-g" in the
> kernel config), generate a coredump and run kgdb on it. If you load
> modules, you need to run "make gdbinit" in the kernel compile
> directory (old style kernel compiling, not the make buildkernel one).
> This will allow to run "kldsyms" in kgdb which loads the debug symbols
> for the modules. A trace will show the line numbers then.
>

# uname -a
FreeBSD hp010 7.0-CURRENT FreeBSD 7.0-CURRENT #0: Tue Jan 16 01:47:09
CST 2007     swhetzel at hp010:/usr/src/7x/sys-orig/amd64/compile/GENERIC.debug
 amd64

NOTE: GENERIC.debug is the same as the GENERIC config file, except I
removed the debugging options from GENERIC, and placed them in
GENERIC.debug. GENERIC.debug just includes GENERIC.

# cd /usr/src/7x/sys-orig/amd64/compile/GENERIC.debug
# kdb -n 0 kernel.debug

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x0
fault code              = supervisor read data, page not present
instruction pointer     = 0x8:0xffffffffa2cb3ce8
stack pointer           = 0x10:0xffffffffa314e9d0
frame pointer           = 0x10:0xffffffffa314ea50
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 23285 (bash)
panic: from debugger
cpuid = 0
Uptime: 22m17s
Physical memory: 1008 MB
Dumping 122 MB: 107 91 75 59 43 27 11

#0  doadump () at pcpu.h:172
172             __asm __volatile("movq %%gs:0,%0" : "=r" (td));
(kgdb) kldsysms
:
(kgdb) list *0xffffffffa2cb3ce8
0xffffffffa2cb3ce8 is in linux_proc_exit
(/usr/src/7x/sys-orig/modules/linux/../../compat/linux/linux_emul.c:173).
168             child_clear_tid = em->child_clear_tid;
169
170             EMUL_UNLOCK(&emul_lock);
171
172             EMUL_SHARED_WLOCK(&emul_shared_lock);
173             LIST_REMOVE(em, threads);
174
175             PROC_LOCK(p);
176             p->p_emuldata = NULL;
177             PROC_UNLOCK(p);
(kgdb) backtrace
#0  doadump () at pcpu.h:172
During symbol reading, Incomplete CFI data; unspecified registers at
0xffffffff80445bbc.
#1  0xffffffff804464b9 in boot (howto=0x104) at
../../../kern/kern_shutdown.c:411
#2  0xffffffff80445f47 in panic (fmt=0xffffffff806a82a7 "from
debugger") at ../../../kern/kern_shutdown.c:567
#3  0xffffffff801ac8c7 in db_panic (addr=0x0, have_addr=0x0,
count=0x0, modif=0x0) at ../../../ddb/db_command.c:433
#4  0xffffffff801acd69 in db_command_loop () at ../../../ddb/db_command.c:401
#5  0xffffffff801aec73 in db_trap (type=0xa314e6d0, code=0x0) at
../../../ddb/db_main.c:222
#6  0xffffffff8046c428 in kdb_trap (type=0xc, code=0x0,
tf=0xffffffffa314e920) at ../../../kern/subr_kdb.c:502
#7  0xffffffff80654f41 in trap_fatal (frame=0xffffffffa314e920,
eva=0xffffff00279ee000)
    at ../../../amd64/amd64/trap.c:691
#8  0xffffffff80655313 in trap_pfault (frame=0xffffffffa314e920,
usermode=0x0) at ../../../amd64/amd64/trap.c:614
#9  0xffffffff80655575 in trap (frame=0xffffffffa314e920) at
../../../amd64/amd64/trap.c:382
#10 0xffffffff8063d39e in calltrap () at ../../../amd64/amd64/exception.S:169
#11 0xffffffffa2cb3ce8 in linux_proc_exit (arg=0x4, p=0xffffff002670ba80)
    at /usr/src/7x/sys-orig/modules/linux/../../compat/linux/linux_emul.c:173
#12 0xffffffff8042a689 in exit1 (td=0xffffff00279ee000, rv=0x0) at
../../../kern/kern_exit.c:233
#13 0xffffffffa2cbe5a1 in linux_exit_group (td=0xffffff00279ee000,
args=0xffffffffa314ebe0)
    at /usr/src/7x/sys-orig/modules/linux/../../compat/linux/linux_misc.c:1634
#14 0xffffffff8068e0a0 in ia32_syscall (frame=0xffffffffa314ec80) at
../../../amd64/ia32/ia32_syscall.c:187
#15 0xffffffff8063d780 in Xint0x80_syscall () at ia32_exception.S:65
#16 0x00000000281923e3 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb) frame 11
#11 0xffffffffa2cb3ce8 in linux_proc_exit (arg=0x4, p=0xffffff002670ba80)
    at /usr/src/7x/sys-orig/modules/linux/../../compat/linux/linux_emul.c:173
173             LIST_REMOVE(em, threads);
(kgdb)  p *em
$2 = {
  pid = 0x5af5,
  child_set_tid = 0x0,
  child_clear_tid = 0x0,
  shared = 0xffffff002ea8b8f0,
  pdeath_signal = 0x0,
  threads = {
    le_next = 0x0,
    le_prev = 0x0
  }
}

Anything else we need to debug this?

Scot
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