Re: Fatal trap 12: page fault while in kernel mode with samba

Hilko Meyer schrieb:
>Hilko Meyer schrieb:
>>Doug White schrieb:
>>>On Wed, 24 Mar 2004, Hilko Meyer wrote:
>>>
>Then I tried the GENERIC-kernel. And it also crashed, if I access the CDROM
>via samba. I've compiled it with
>makeoptions     DEBUG=-g
>but the gdb-output looks weird:

I've compiled the GENERIC-Kernel again. Of course before I've got the new
security advisory....
So, the system is still 5.2.1-RELEASE-p3 and the crash occurs with
samba-2.2.8a. The Backtrace follows below.

---
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address= 0x8
fault code= supervisor read, page not present
instruction pointer= 0x8:0xc0632f10
stack pointer        = 0x10:0xcdaf4c8c
frame pointer        = 0x10:0xcdaf4cec
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= 31596 (smbd)
trap number= 12
panic: page fault
cpuid = 0; 

syncing disks, buffers remaining... 295 295 295 294 294 294 294 294 294 294
294 294 294 294 294 294 294 294 294 294 294 294 294 
giving up on 231 buffers
Uptime: 2h10m33s
Dumping 128 MB
 16 32 48 64 80 96 112
---
Reading symbols from /boot/kernel/logo_saver.ko...done.
Loaded symbols for /boot/kernel/logo_saver.ko
Reading symbols from
/usr/obj/usr/src/sys/GENERIC/modules/usr/src/sys/modules/linux/linux.ko.debug...done.
Loaded symbols for
/usr/obj/usr/src/sys/GENERIC/modules/usr/src/sys/modules/linux/linux.ko.debug
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
240dumping++;
(kgdb) list *0xc0632f10
0xc0632f10 is in quotactl (/usr/src/sys/kern/vfs_syscalls.c:206).
201NDFREE(&nd, NDF_ONLY_PNBUF);
202error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
203vrele(nd.ni_vp);
204if (error)
205return (error);
206error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, td);
207vn_finished_write(mp);
208return (error);
209}
210
(kgdb) bt
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc05e8653 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:372
#2  0xc05e896b in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3  0xc0756591 in trap_fatal (frame=0xcdaf4c4c, eva=8) at
/usr/src/sys/i386/i386/trap.c:821
#4  0xc07562cd in trap_pfault (frame=0xcdaf4c4c, usermode=0, eva=8) at
/usr/src/sys/i386/i386/trap.c:735
#5  0xc0755f65 in trap (frame=
      {tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = -844149484, tf_esi =
-1038023424, tf_ebp = -844149524, tf_isp = -844149640, tf_ebx = 0, tf_edx =
4, tf_ecx = -1029080276, tf_eax = 0, tf_trapno = 12, tf_err = 0, tf_eip =
-1067241712, tf_cs = 8, tf_eflags = 66118, tf_esp = 0, tf_ss = 136315328})
at /usr/src/sys/i386/i386/trap.c:420
#6  0xc07458b8 in calltrap () at {standard input}:94
#7  0xc075682f in syscall (frame=
      {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 1003, tf_esi =
-1077944416, tf_ebp = -1077944360, tf_isp = -844149388, tf_ebx = 1009,
tf_edx = 1009, tf_ecx = -1077942920, tf_eax = 148, tf_trapno = 22, tf_err =
2, tf_eip = 674856735, tf_cs = 31, tf_eflags = 582, tf_esp = -1077944436,
tf_ss = 47}) at /usr/src/sys/i386/i386/trap.c:1010
#8  0xc074590d in Xint0x80_syscall () at {standard input}:136
---Can't read userspace from dump, or kernel process---

(kgdb) quit

If you need more Information, I'll try to provide you with more Information.
But I'll need some help and guidance, because I'm new to kernel debugging.

bye,
Hilko