[Bug 99013] [regression, bisected] radeonsi: commit 4c8c13b3 "Use amdgcn intrinsics for fs interpolation" makes system unusable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99013

            Bug ID: 99013
           Summary: [regression, bisected] radeonsi: commit 4c8c13b3  "Use
                    amdgcn intrinsics for fs interpolation" makes system
                    unusable
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: alexandre.f.demers at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Using an R9 280X
kernel 4.8.12 (radeonsi driver)

LLVM 4.0.0svn r288795
Latest drm from git
latest ddx ati from git

When compiling mesa commit 4c8c13b3, the system is unusable. Reverting to the
previous commit fix the behavior.

My screen displays a fixed background followed by a black flash and a refresh
every few seconds once logged in Gnome 3.

Switching to a terminal shows rings hanging and diving into systemd's journal,
I see a lot of the following:

déc 06 23:23:47 Xander kernel: ------------[ cut here ]------------
déc 06 23:23:47 Xander kernel: WARNING: CPU: 1 PID: 650 at
drivers/gpu/drm/radeon/radeon_objec
déc 06 23:23:47 Xander kernel: Modules linked in: fuse nls_iso8859_1 nls_cp437
vfat fat kvm_am
déc 06 23:23:47 Xander kernel:  ehci_hcd libata usbcore scsi_mod usb_common
i8042 serio i915 i
déc 06 23:23:47 Xander kernel: CPU: 1 PID: 650 Comm: Xorg Tainted: G      D W  
    4.8.12-2-A
déc 06 23:23:47 Xander kernel: Hardware name: To be filled by O.E.M. To be
filled by O.E.M./M5
déc 06 23:23:47 Xander kernel:  0000000000000286 00000000e7a1a4fc
ffff880406243b40 ffffffff812
déc 06 23:23:47 Xander kernel:  0000000000000000 0000000000000000
ffff880406243b80 ffffffff810
déc 06 23:23:47 Xander kernel:  0000005400000001 ffff8803e57f5468
ffffffffffffffff ffff8803e57
déc 06 23:23:47 Xander kernel: Call Trace:
déc 06 23:23:47 Xander kernel:  [<ffffffff812fde90>] dump_stack+0x63/0x83
déc 06 23:23:47 Xander kernel:  [<ffffffff8107c85b>] __warn+0xcb/0xf0
déc 06 23:23:47 Xander kernel:  [<ffffffff8107c98d>]
warn_slowpath_null+0x1d/0x20
déc 06 23:23:47 Xander kernel:  [<ffffffffa00ff09a>]
radeon_ttm_bo_destroy+0xea/0xf0 [radeon]
déc 06 23:23:47 Xander kernel:  [<ffffffffa006b7fb>]
ttm_bo_release_list+0xcb/0x220 [ttm]
déc 06 23:23:47 Xander kernel:  [<ffffffffa0073780>] ?
ttm_bo_man_put_node+0x40/0x50 [ttm]
déc 06 23:23:47 Xander kernel:  [<ffffffffa006c5bf>] ttm_bo_unref+0x1af/0x220
[ttm]
déc 06 23:23:47 Xander kernel:  [<ffffffffa00ff5d9>] radeon_bo_unref+0x39/0x70
[radeon]
déc 06 23:23:47 Xander kernel:  [<ffffffffa01124f7>]
radeon_gem_object_free+0x57/0x70 [radeon]
déc 06 23:23:47 Xander kernel:  [<ffffffffa00048a9>]
drm_gem_object_free+0x29/0x70 [drm]
déc 06 23:23:47 Xander kernel:  [<ffffffffa000492a>]
drm_gem_object_unreference_unlocked+0x3a/
déc 06 23:23:47 Xander kernel:  [<ffffffffa0004a55>]
drm_gem_object_handle_unreference_unlocke
déc 06 23:23:47 Xander kernel:  [<ffffffffa0005025>]
drm_gem_object_release_handle+0x55/0xa0 [
déc 06 23:23:47 Xander kernel:  [<ffffffff812fe912>] idr_for_each+0xb2/0x110
déc 06 23:23:47 Xander kernel:  [<ffffffffa0004fd0>] ?
drm_gem_object_init+0x40/0x40 [drm]
déc 06 23:23:47 Xander kernel:  [<ffffffffa0005820>] drm_gem_release+0x20/0x30
[drm]
déc 06 23:23:47 Xander kernel:  [<ffffffffa00047c2>] drm_release+0x2c2/0x380
[drm]
déc 06 23:23:47 Xander kernel:  [<ffffffff8120b4ff>] __fput+0x9f/0x1e0
déc 06 23:23:47 Xander kernel:  [<ffffffff8120b67e>] ____fput+0xe/0x10
déc 06 23:23:47 Xander kernel:  [<ffffffff8109a0d0>] task_work_run+0x80/0xa0
déc 06 23:23:47 Xander kernel:  [<ffffffff810806e2>] do_exit+0x2c2/0xb50
déc 06 23:23:47 Xander kernel:  [<ffffffff81003016>] ?
___preempt_schedule+0x16/0x18
déc 06 23:23:47 Xander kernel:  [<ffffffff81080feb>] do_group_exit+0x3b/0xb0
déc 06 23:23:47 Xander kernel:  [<ffffffff81081074>] SyS_exit_group+0x14/0x20
déc 06 23:23:47 Xander kernel:  [<ffffffff815f8032>]
entry_SYSCALL_64_fastpath+0x1a/0xa4
déc 06 23:23:47 Xander kernel: ---[ end trace 44dfe616ce5e8b1c ]---

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