XFree86 kernel panic

Sat Jul 5 17:03:33 PDT 2003

Hi guys,

Attached is a gdb trace of a panic on a -current system from a few
days ago. It seems like it was caused by a select(2) in XFree86.
Although I was testing some unrelated changes in libthr kernel code,
I have seen this panic before (about 2 weeks ago) on a stock
kernel.

FreeBSD kokeb.ambesa.net 5.1-CURRENT FreeBSD 5.1-CURRENT #12:
Sat Jul  5 02:00:40 EDT 2003     mtm at kokeb.ambesa.net:/a/current/obj/a/current/src/sys/THRTEST  i386

Cheers.
-- 
Mike Makonnen  | GPG-KEY: http://www.identd.net/~mtm/mtm.asc
mtm at identd.net | D228 1A6F C64E 120A A1C9  A3AA DAE1 E2AF DBCC 68B9
mtm at FreeBSD.Org| FreeBSD - The Power To Serve
-------------- next part --------------
Script started on Sat Jul  5 19:43:02 2003
Jul/05 mtm at kokeb ~% sudo gdb -k /a/current/obj/a/current/src/sys/THRTEST/kernel.debug /var/crash/vmcore.9
Password:
GNU gdb 5.2.1 (FreeBSD)
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-undermydesk-freebsd"...
panic: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0x818181b1
fault code		= supervisor read, page not present
instruction pointer	= 0x8:0xc026a3e2
stack pointer	        = 0x10:0xd2657b08
frame pointer	        = 0x10:0xd2657b1c
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, def32 1, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 3
current process		= 735 (XFree86)
trap number		= 12
panic: page fault

syncing disks, buffers remaining... 2223 2223 2222 2221 2221 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 2219 
giving up on 154 buffers
Uptime: 16h51m12s
Dumping 255 MB
ata0: resetting devices ..
done
 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
---
Reading symbols from /boot/kernel/snd_pcm.ko...done.
Loaded symbols for /boot/kernel/snd_pcm.ko
Reading symbols from /boot/kernel/snd_via82c686.ko...done.
Loaded symbols for /boot/kernel/snd_via82c686.ko
Reading symbols from /boot/kernel/acpi.ko...done.
Loaded symbols for /boot/kernel/acpi.ko
Reading symbols from /boot/kernel/netgraph.ko...done.
Loaded symbols for /boot/kernel/netgraph.ko
Reading symbols from /boot/kernel/ng_ether.ko...done.
Loaded symbols for /boot/kernel/ng_ether.ko
Reading symbols from /boot/kernel/ng_pppoe.ko...done.
Loaded symbols for /boot/kernel/ng_pppoe.ko
Reading symbols from /boot/kernel/ng_socket.ko...done.
Loaded symbols for /boot/kernel/ng_socket.ko
Reading symbols from /boot/kernel/if_tun.ko...done.
Loaded symbols for /boot/kernel/if_tun.ko
#0  doadump () at /a/current/src/sys/kern/kern_shutdown.c:240
240		dumping++;
(kgdb) bt
#0  doadump () at /a/current/src/sys/kern/kern_shutdown.c:240
#1  0xc023f1fd in boot (howto=256)
    at /a/current/src/sys/kern/kern_shutdown.c:372
#2  0xc023f578 in panic () at /a/current/src/sys/kern/kern_shutdown.c:550
#3  0xc03d42a0 in trap_fatal (frame=0xd2657ac8, eva=0)
    at /a/current/src/sys/i386/i386/trap.c:836
#4  0xc03d3fb3 in trap_pfault (frame=0xd2657ac8, usermode=0, eva=2172748209)
    at /a/current/src/sys/i386/i386/trap.c:750
#5  0xc03d3b98 in trap (frame=
      {tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = 3, tf_esi = 36, tf_ebp = -765101284, tf_isp = -765101324, tf_ebx = -1032921444, tf_edx = -1032921444, tf_ecx = -1028802816, tf_eax = -2122219135, tf_trapno = 12, tf_err = 0, tf_eip = -1071209502, tf_cs = 8, tf_eflags = 78466, tf_esp = -1032945408, tf_ss = 64})
    at /a/current/src/sys/i386/i386/trap.c:435
#6  0xc03c56c8 in calltrap () at {standard input}:96
#7  0xc02654cf in selscan (td=0xc28bbd10, ibits=0xd2657b9c, obits=0xd2657b8c, 
    nfd=50) at file.h:272
#8  0xc0264f8d in kern_select (td=0xc28bbd10, nd=50, fd_in=0x81fba20, 
    fd_ou=0x0, fd_ex=0x0, tvp=0xd2657cd8)
    at /a/current/src/sys/kern/sys_generic.c:822
#9  0xc0264b56 in select (td=0x0, uap=0xd2657d14)
    at /a/current/src/sys/kern/sys_generic.c:726
#10 0xc03d459a in syscall (frame=
      {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = -1, tf_esi = 7482434, tf_ebp = -1077937896, tf_isp = -765100684, tf_ebx = 0, tf_edx = 16, tf_ecx = 143876576, tf_eax = 93, tf_trapno = 0, tf_err = 2, tf_eip = 673590515, tf_cs = 31, tf_eflags = 12870, tf_esp = -1077938516, tf_ss = 47})
    at /a/current/src/sys/i386/i386/trap.c:1023
#11 0xc03c571d in Xint0x80_syscall () at {standard input}:138
---Can't read userspace from dump, or kernel process---

(kgdb) qqui   uit t
]2;mtm (ttyp2) kokeb:~]1;mtm at kokeb:~Jul/05 mtm at kokeb ~% ^Dexit

Script done on Sat Jul  5 19:44:17 2003