Re: repeatable panic on pageout with 945GM

It looks like it might be trying to remove mappings for a page that doesn't
have any. It's a bit odd. Likely a bug in cdev_pager_free_page or gem
release mmap. Compile the kernel and driver with -O0 and look at the page.
It's too bad I don't support AGP yet with DRM 4.6. Maybe in a week or two.

-M

On Thursday, June 2, 2016, Michael Butler <imb_at_protected-networks.net>
wrote:

> On 05/23/16 21:10, Michael Butler wrote:
> > On 05/22/16 09:58, Michael Butler wrote:
> >> With KDE and compositing enabled, I randomly get the following:
> >>
> >> (kgdb) info stack
> >> #0  doadump (textdump=<value optimized out>) at pcpu.h:221
> >> #1  0xffffffff8064e98e in kern_reboot (howto=260) at
> >> /usr/src/sys/kern/kern_shutdown.c:366
> >> #2  0xffffffff8064eea1 in vpanic (fmt=<value optimized out>, ap=<value
> >> optimized out>) at /usr/src/sys/kern/kern_shutdown.c:759
> >> #3  0xffffffff8064ed13 in panic (fmt=0x0) at
> >> /usr/src/sys/kern/kern_shutdown.c:690
> >> #4  0xffffffff809d18ed in vm_fault_hold (map=<value optimized out>,
> >> vaddr=<value optimized out>, fault_type=<value optimized out>,
> >>     fault_flags=<value optimized out>, m_hold=<value optimized out>) at
> >> /usr/src/sys/vm/vm_fault.c:327
> >> #5  0xffffffff809cf548 in vm_fault (map=0xfffff80002000000, vaddr=<value
> >> optimized out>, fault_type=1 '\001', fault_flags=<value optimized out>)
> >>     at /usr/src/sys/vm/vm_fault.c:273
> >> #6  0xffffffff80a1849f in trap_pfault (frame=<value optimized out>,
> >> usermode=0) at /usr/src/sys/amd64/amd64/trap.c:741
> >> #7  0xffffffff80a17b30 in trap (frame=0xfffffe00dbec5830) at
> >> /usr/src/sys/amd64/amd64/trap.c:442
> >> #8  0xffffffff809fd5a1 in calltrap () at
> >> /usr/src/sys/amd64/amd64/exception.S:236
> >> #9  0xffffffff80a0a3bb in pmap_remove_all (m=<value optimized out>) at
> >> /usr/src/sys/amd64/amd64/pmap.c:3950
> >> #10 0xffffffff809c0c57 in cdev_pager_free_page (object=<value optimized
> >> out>, m=0xfffffe0001e410d0) at /usr/src/sys/vm/device_pager.c:214
> >> #11 0xffffffff816aff33 in i915_gem_release_mmap (obj=<value optimized
>
> [ .. snip .. ]
>
> Even with the most recent mesa update - something is upsetting this
> device :-(
>
> (kgdb) bt
> #0  doadump (textdump=<value optimized out>) at pcpu.h:221
> #1  0xffffffff805cfe9a in kern_reboot (howto=260) at
> /usr/src/sys/kern/kern_shutdown.c:366
> #2  0xffffffff805d03e1 in vpanic (fmt=<value optimized out>, ap=<value
> optimized out>) at /usr/src/sys/kern/kern_shutdown.c:759
> #3  0xffffffff805d0253 in panic (fmt=0x0) at
> /usr/src/sys/kern/kern_shutdown.c:690
> #4  0xffffffff8096c56e in vm_fault_hold (map=<value optimized out>,
> vaddr=<value optimized out>, fault_type=<value optimized out>,
>     fault_flags=<value optimized out>, m_hold=<value optimized out>) at
> /usr/src/sys/vm/vm_fault.c:327
> #5  0xffffffff80969f78 in vm_fault (map=0xfffff80002000000, vaddr=<value
> optimized out>, fault_type=1 '\001', fault_flags=<value optimized out>)
>     at /usr/src/sys/vm/vm_fault.c:273
> #6  0xffffffff809b556f in trap_pfault (frame=<value optimized out>,
> usermode=0) at /usr/src/sys/amd64/amd64/trap.c:741
> #7  0xffffffff809b4c00 in trap (frame=0xfffffe00dc0ef310) at
> /usr/src/sys/amd64/amd64/trap.c:442
> #8  0xffffffff80999d81 in calltrap () at
> /usr/src/sys/amd64/amd64/exception.S:236
> #9  0xffffffff809a6d4e in pmap_remove_all (m=<value optimized out>) at
> /usr/src/sys/amd64/amd64/pmap.c:3950
> #10 0xffffffff8095ab7b in cdev_pager_free_page (object=<value optimized
> out>, m=0xfffffe0001e2c270) at /usr/src/sys/vm/device_pager.c:214
> #11 0xffffffff816aff33 in i915_gem_release_mmap (obj=<value optimized
> out>) at
> /usr/src/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:1691
> #12 0xffffffff816b15ba in i915_gem_object_get_fence (obj=<value
> optimized out>) at
> /usr/src/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:105
> #13 0xffffffff816b7f2e in i915_gem_execbuffer_reserve_object
> (obj=0xfffff8009858f200, ring=<value optimized out>)
>     at
>
> /usr/src/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem_execbuffer.c:368
> #14 0xffffffff816b7d8f in i915_gem_execbuffer_reserve () at
>
> /usr/src/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem_execbuffer.c:491
> #15 0xffffffff816b6bb5 in i915_gem_do_execbuffer () at
>
> /usr/src/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem_execbuffer.c:1036
> #16 0xffffffff816b7ad1 in i915_gem_execbuffer2 (dev=0xfffff800059e9000,
> data=0xfffffe00dc0efa20, file=0xfffff80005db4a00)
>     at
>
> /usr/src/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem_execbuffer.c:1273
> #17 0xffffffff812c7eae in drm_ioctl (kdev=<value optimized out>,
> cmd=<value optimized out>, data=0xfffffe00dc0efa20 "", flags=<value
> optimized out>,
>     p=<value optimized out>) at
> /usr/src/sys/modules/drm2/drm2/../../../dev/drm2/drm_drv.c:467
> #18 0xffffffff804c721f in devfs_ioctl_f (fp=0xfffff800afba1550,
> com=2151703657, data=0xfffffe00dc0efa20, cred=0xfffff800af2dc800,
> td=0xfffff80005e2ca00)
>     at /usr/src/sys/fs/devfs/devfs_vnops.c:815
> #19 0xffffffff806377fe in kern_ioctl (td=<value optimized out>,
> fd=<value optimized out>, com=<value optimized out>,
> data=0xfffffe00dc0efa20 "") at file.h:327
> #20 0xffffffff80637481 in sys_ioctl (td=0xfffff80005e2ca00,
> uap=0xfffffe00dc0efb80) at /usr/src/sys/kern/sys_generic.c:743
> #21 0xffffffff809b5e79 in amd64_syscall (td=<value optimized out>,
> traced=0) at subr_syscall.c:135
> #22 0xffffffff8099a06b in Xfast_syscall () at
> /usr/src/sys/amd64/amd64/exception.S:396
> #23 0x00000008024f57ca in ?? ()
> Previous frame inner to this frame (corrupt stack?)
> Current language:  auto; currently minimal
>
> Any hints welcome,
>
>         imb
>
>
>
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