[Bug 109005] New: i915 slab shrink cause a panic

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109005

            Bug ID: 109005
           Summary: i915 slab shrink cause a panic
           Product: DRI
           Version: XOrg git
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: alek.du at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

During system stress test, when memory is under pressure, we meet:

[2018-11-28 23:17:54] [12278.310417] kernel BUG at
drivers/gpu/drm/i915/i915_gem.c:4702!
[2018-11-28 23:17:54] [12278.310802] invalid opcode: 0000 [#1] PREEMPT SMP
[2018-11-28 23:17:54] [12278.311012] CPU: 0 PID: 61 Comm: kswapd0 Tainted: G   
 U  WC        4.19.0-26.iot-lts2018-sos #1
[2018-11-28 23:17:54] [12278.311393] RIP:
0010:i915_gem_wait_for_idle.part.78.cold.114+0x45/0x47
[2018-11-28 23:17:54] [12278.311675] Code: 7b 8b ae ff 48 8b 35 e6 92 3c 01 49
c7 c0 af 48 55 a9 b9 5e 12 00 00 48 c7 c2 50 7a 0b a9 48 c7 c7 f4 e6 60 a8 e8
37 38 b6 ff <0f> 0b 48 c7 c1 a8 59 55 a9 ba b8 12 00 00 48 c7 c6 20 7a 0b a9 48
[2018-11-28 23:17:55] [12278.312447] RSP: 0018:ffff8e31acd8bbb8 EFLAGS:
00010246
[2018-11-28 23:17:55] [12278.312673] RAX: 000000000000000e RBX:
000000000000000a RCX: 0000000000000000
[2018-11-28 23:17:55] [12278.312971] RDX: 0000000000000001 RSI:
0000000000000008 RDI: ffff8e31ae841400
[2018-11-28 23:17:55] [12278.313268] RBP: ffff8e31acea8340 R08:
0000000001416578 R09: ffff8e31aea15000
[2018-11-28 23:17:55] [12278.313566] R10: ffff8e31ae807100 R11:
ffff8e31ae841400 R12: ffff8e31acea0000
[2018-11-28 23:17:55] [12278.313863] R13: 00000b2ab1d38ed0 R14:
0000000000000000 R15: ffff8e31acd8bd70
[2018-11-28 23:17:55] [12278.314162] FS:  0000000000000000(0000)
GS:ffff8e31afa00000(0000) knlGS:0000000000000000
[2018-11-28 23:17:55] [12278.314499] CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
[2018-11-28 23:17:55] [12278.314741] CR2: 00007ff94948f000 CR3:
0000000226813000 CR4: 00000000003406f0
[2018-11-28 23:17:55] [12278.315039] Call Trace:
[2018-11-28 23:17:55] [12278.315162]  i915_gem_shrink+0x3b7/0x4b0
[2018-11-28 23:17:55] [12278.315340]  i915_gem_shrinker_scan+0x104/0x130
[2018-11-28 23:17:55] [12278.315537]  do_shrink_slab+0x12c/0x2c0
[2018-11-28 23:17:55] [12278.315706]  shrink_slab+0x225/0x2c0
[2018-11-28 23:17:55] [12278.315864]  shrink_node+0xe4/0x430
[2018-11-28 23:17:55] [12278.316018]  kswapd+0x3ce/0x730
[2018-11-28 23:17:55] [12278.316161]  ? mem_cgroup_shrink_node+0x1a0/0x1a0
[2018-11-28 23:17:55] [12278.316365]  kthread+0x11e/0x140
[2018-11-28 23:17:55] [12278.316508]  ? kthread_create_worker_on_cpu+0x70/0x70
[2018-11-28 23:17:55] [12278.316727]  ret_from_fork+0x3a/0x50
[2018-11-28 23:17:55] [12278.316884] Modules linked in: igb_avb(C) xhci_pci
xhci_hcd dca ici_isys_mod ipu4_acpi intel_ipu4_isys_csslib intel_ipu4_psys
intel_ipu4_psys_csslib intel_ipu4_mmu intel_ipu4 iova crlmodule_lite

More specifically,
./drivers/gpu/drm/i915/i915_gem.c 4702

err = wait_for_engines(i915);
if (err)
return err;

i915_retire_requests(i915);
GEM_BUG_ON(i915->gt.active_requests);

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