Date: Thu, 29 Dec 2005 01:45:00 +0200 From: Rostislav Krasny <rosti.bsd@gmail.com> To: freebsd-geom@FreeBSD.org Subject: Fatal trap 12 in g_event Message-ID: <20051229014500.6e7496aa.rosti.bsd@gmail.com>
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Hi,
I use FreeBSD 6.0-STABLE on my Pentium III machine with following ATA
configuration:
ad0: 19541MB <Maxtor 5T020H2 TAH71DP0> at ata0-master UDMA100
ad1: 14324MB <IBM DTLA-307015 TX2DA5AA> at ata0-slave UDMA100
ad2: 14649MB <IBM DTLA-307015 TX2OA5AA> at ata1-master UDMA100
acd0: CDRW <YAMAHA CRW2200E/1.0D> at ata1-slave UDMA33
FreeBSD is installed on the ad1 in DD mode. On the ad0 I have one NTFS
filesystem and on the ad2 I have two FAT32 filesystems. Normally only
ad1* are mounted. I have an old (original) CD of a "UNIX Unleashed"
book. I inserted this CD into the acd0, mounted it read-only to /cdrom
and then ran following command as a normal user (well, the user is also
in the wheel group):
cp -Rv /cdrom/* ~/unleashied
That old CD probably has bad blocks. After some time, when the cp was
still running, I got following kernel panic:
ad2: detached
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x3b0
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc0447742
stack pointer = 0x28:0xc7b5ccc8
frame pointer = 0x28:0xc7b5ccd8
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 = 2 (g_event)
trap number = 12
panic: page fault
Uptime: 7m46s
Dumping 127 MB (2 chunks)
chunk 0: 1MB (159 pages) ... ok
chunk 1: 127MB (32512 pages) 112 96 80 64 48 32 16
You can find a trace in the attached text file. Further information can
be sent upon request.
Thank you in advance
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Script started on Thu Dec 29 00:46:54 2005
saturn# pwd=0D
/usr/obj/usr/src/sys/MYKERNEL
saturn# kgdb kernel.debug /var/crash/vmcore.0=0D
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:=
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 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 condition=
s.
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-marcel-freebsd".
Unread portion of the kernel message buffer:
ad2: detached
Fatal trap 12: page fault while in kernel mode
fault virtual address =3D 0x3b0
fault code =3D supervisor read, page not present
instruction pointer =3D 0x20:0xc0447742
stack pointer =3D 0x28:0xc7b5ccc8
frame pointer =3D 0x28:0xc7b5ccd8
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 2 (g_event)
trap number =3D 12
panic: page fault
Uptime: 7m46s
Dumping 127 MB (2 chunks)
chunk 0: 1MB (159 pages) ... ok
chunk 1: 127MB (32512 pages) 112 96 80 64 48 32 16
#0 doadump () at pcpu.h:165
165 __asm __volatile("movl %%fs:0,%0" : "=3Dr" (td));
(kgdb) where
#0 doadump () at pcpu.h:165
#1 0xc04d3d66 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c:3=
99
#2 0xc04d3ffc in panic (fmt=3D0xc0620955 "%s")
at /usr/src/sys/kern/kern_shutdown.c:555
#3 0xc0602b44 in trap_fatal (frame=3D0xc7b5cc88, eva=3D944)
at /usr/src/sys/i386/i386/trap.c:836
#4 0xc06028ab in trap_pfault (frame=3D0xc7b5cc88, usermode=3D0, eva=3D944)
at /usr/src/sys/i386/i386/trap.c:744
#5 0xc0602509 in trap (frame=3D
{tf_fs =3D -1049886712, tf_es =3D -944439256, tf_ds =3D -1068957656, =
tf_edi =3D 0, tf_esi =3D 0, tf_ebp =3D -944386856, tf_isp =3D -944386892, t=
f_ebx =3D -1050171520, tf_edx =3D -1051733632, tf_ecx =3D 4, tf_eax =3D 0, =
tf_trapno =3D 12, tf_err =3D 0, tf_eip =3D -1069254846, tf_cs =3D 32, tf_ef=
lags =3D 590338, tf_esp =3D 6, tf_ss =3D -1050171520})
at /usr/src/sys/i386/i386/trap.c:434
#6 0xc05f2c4a in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7 0xc0447742 in acd_geom_detach (arg=3D0xc167a780, flag=3D0)
at /usr/src/sys/dev/ata/atapi-cd.c:199
#8 0xc049af75 in one_event () at /usr/src/sys/geom/geom_event.c:206
#9 0xc049b04d in g_run_events () at /usr/src/sys/geom/geom_event.c:226
#10 0xc049bec1 in g_event_procbody () at /usr/src/sys/geom/geom_kern.c:141
#11 0xc04beb84 in fork_exit (callout=3D0xc049be4c <g_event_procbody>, arg=
=3D0x0,=20
frame=3D0xc7b5cd38) at /usr/src/sys/kern/kern_fork.c:789
#12 0xc05f2cac in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:=
208
(kgdb) q
saturn# ^D=08=08exit
Script done on Thu Dec 29 00:47:24 2005
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