r212281 breaks KDE
Kostik Belousov
kostikbel at gmail.com
Sun Sep 12 19:19:09 UTC 2010
On Sun, Sep 12, 2010 at 10:42:57AM -0400, Michael Butler wrote:
> For the last week, on and off, I've been looking for something that
> caused KDE to be horridly unstable, i.e. machine freezes with and
> without a core-dump.
>
> Removing r212281 (and r212282) restores that stability. Is there a race
> condition that this update exposes by reducing lock strength?
>
> The most common failure with this code included produces a back-trace
> similar to the one attached,
>
> imb
> toshi.auburn.protected-networks.net dumped core - see /var/crash/vmcore.0
>
> Sat Sep 11 15:33:22 EDT 2010
>
> FreeBSD toshi.auburn.protected-networks.net 9.0-CURRENT FreeBSD 9.0-CURRENT #5 r212466M: Sat Sep 11 10:10:59 EDT 2010 root at toshi.auburn.protected-networks.net:/usr/obj/usr/home/imb/svn/head/sys/TOSHI i386
>
> panic: page fault
>
> 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 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-marcel-freebsd"...
>
> Unread portion of the kernel message buffer:
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address = 0x22c
> fault code = supervisor read, page not present
> instruction pointer = 0x20:0xc066705a
> stack pointer = 0x28:0xe944b7f8
> frame pointer = 0x28:0xe944b810
> 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 = 1938 (kdeinit4)
> trap number = 12
> panic: page fault
> cpuid = 0
> Uptime: 2m33s
> Physical memory: 3049 MB
> Dumping 225 MB: 210 194 178 162 146 130 114 98 82 66 50 34 18 2
>
> Reading symbols from /boot/modules/vboxdrv.ko...done.
> Loaded symbols for /boot/modules/vboxdrv.ko
> Reading symbols from /boot/modules/vboxnetflt.ko...done.
> Loaded symbols for /boot/modules/vboxnetflt.ko
> Reading symbols from /boot/modules/vboxnetadp.ko...done.
> Loaded symbols for /boot/modules/vboxnetadp.ko
> Reading symbols from /usr/local/modules/fuse.ko...done.
> Loaded symbols for /usr/local/modules/fuse.ko
> #0 doadump () at pcpu.h:231
> 231 pcpu.h: No such file or directory.
> in pcpu.h
> (kgdb) #0 doadump () at pcpu.h:231
> #1 0xc06760f7 in boot (howto=260)
> at /usr/home/imb/svn/head/sys/kern/kern_shutdown.c:416
> #2 0xc06764e8 in panic (fmt=0x104 <Address 0x104 out of bounds>)
> at /usr/home/imb/svn/head/sys/kern/kern_shutdown.c:590
> #3 0xc09950ff in trap_fatal (frame=0xe944b7b8, eva=40)
> at /usr/home/imb/svn/head/sys/i386/i386/trap.c:980
> #4 0xc0995469 in trap_pfault (frame=0xe944b7b8, usermode=0, eva=556)
> at /usr/home/imb/svn/head/sys/i386/i386/trap.c:893
> #5 0xc09958f7 in trap (frame=0xe944b7b8)
> at /usr/home/imb/svn/head/sys/i386/i386/trap.c:568
> #6 0xc097e16c in calltrap ()
> at /usr/home/imb/svn/head/sys/i386/i386/exception.s:168
> #7 0xc066705a in _mtx_lock_sleep (m=0xc81c26e8, tid=3343885696, opts=0,
> file=0x0, line=0) at /usr/home/imb/svn/head/sys/kern/kern_mutex.c:369
> #8 0xc09385d8 in vnode_create_vobject (vp=0xc825a330, isize=512,
> td=0xc74fa580) at /usr/home/imb/svn/head/sys/vm/vnode_pager.c:111
From the frame 8, please print the content of the *vp, and from it,
content of vm object. The corresponding kgdb commands would be
frame 8
p *vp
p *(vp->v_bufobj.bo_object)
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