panic: vm_page_free_toq: freeing mapped page

[Ulrich Spörlein]

On Mon, 13.07.2009 at 19:15:03 +0200, Ulrich Spörlein wrote:
> On Sun, 12.07.2009 at 14:22:23 -0700, Kip Macy wrote:
> > On Sun, Jul 12, 2009 at 1:31 PM, Ulrich Spörlein<uqs at spoerlein.net> wrote:
> > > Hi,
> > >
> > > 8.0 BETA1 @ r195622 will panic reliably when running the clang static
> > > analyzer on a buildworld with something like the following panic:
> > >
> > > panic: vm_page_free_toq: freeing mapped page 0xffffff00c9715b30
> > > cpuid = 1
> > > KDB: stack backtrace:
> > > db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> > > panic() at panic+0x182
> > > vm_page_free_toq() at vm_page_free_toq+0x1f6
> > > vm_object_terminate() at vm_object_terminate+0xb7
> > > vm_object_deallocate() at vm_object_deallocate+0x17a
> > > _vm_map_unlock() at _vm_map_unlock+0x70
> > > vm_map_remove() at vm_map_remove+0x6f
> > > vmspace_free() at vmspace_free+0x56
> > > vmspace_exec() at vmspace_exec+0x56
> > > exec_new_vmspace() at exec_new_vmspace+0x133
> > > exec_elf32_imgact() at exec_elf32_imgact+0x2ee
> > > kern_execve() at kern_execve+0x3b2
> > > execve() at execve+0x3d
> > > syscall() at syscall+0x1af
> > > Xfast_syscall() at Xfast_syscall+0xe1
> > > --- syscall (59, FreeBSD ELF64, execve), rip = 0x800c20d0c, rsp = 0x7fffffffd6f8, rbp = 0x7fffffffdbf0 ---
> > Can you try the following change:
> > 
> > http://svn.freebsd.org/viewvc/base/user/kmacy/releng_7_2_fcs/sys/vm/vm_object.c?r1=192842&r2=195297
> 
> Applied this to HEAD by hand an ran with it, it died 20-30 minutes into
> the scan-build run. So no luck there. Next up is a test using the
> GENERIC kernel.


No improvement with a GENERIC kernel. Next up will be to run this with
clean sysctl, loader.conf, etc. Then I'll try disabling SMP.

Does the backtrace above point to any specific subsystem? I'm using UFS,
ZFS and GELI on this machine and could try a few combinations...

Bye,
Uli