Date: Tue, 16 Jan 2007 12:05:37 -0600 From: "Scot Hetzel" <swhetzel@gmail.com> To: "Alexander Leidinger" <Alexander@leidinger.net> Cc: emulation@freebsd.org Subject: Re: linuxolator: fatal trap 12 when compiling libX11 Message-ID: <790a9fff0701161005t75222f2l439e8c0c1153ffd2@mail.gmail.com> In-Reply-To: <20070116080015.8dus0vamssso0sww@webmail.leidinger.net> References: <790a9fff0701151314x6dd48ecbg90a54729813e84e@mail.gmail.com> <20070116080015.8dus0vamssso0sww@webmail.leidinger.net>
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On 1/16/07, Alexander Leidinger <Alexander@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@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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