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<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Intel Clear","sans-serif";color:windowtext">I met one kenel panic issue in iVGT, usually can be easily reproduced with multi-vms.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Intel Clear","sans-serif";color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif";color:windowtext">unable to handle kernel NULL pointer dereference at 00000000000000a0IP: [<<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif";color:windowtext">(d29) ffffffffa025a52b>] intel_fbdev_restore_mode+0x57/0x73 [i915]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif";color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif";color:windowtext">The drm_device ->dev_private -></span><span lang="EN-US" style="color:windowtext">
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif";color:windowtext">fbdev ->fb access function run before the initialization of it.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Intel Clear","sans-serif";color:windowtext">Since the “intel_fbdev_initial_config” run in “async_schedule”, before the ifbdev->fb initialization, one access from
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Intel Clear","sans-serif";color:windowtext">drm_release -> drm_lastclose->i915_driver_lastclose-></span><span lang="EN-US">
</span><span lang="EN-US" style="font-family:"Intel Clear","sans-serif";color:windowtext">intel_fbdev_restore_mode occurred, then got kernel panic.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:windowtext">Do we need to add NULL pointer or async_synchronize_cookie() to avoid this issue?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:windowtext">I also find similar issue in bugs.freedesktop<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif""><a href="https://bugs.freedesktop.org/show_bug.cgi?id=93580">https://bugs.freedesktop.org/show_bug.cgi?id=93580</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">Below is the error log:</span><span lang="EN-US" style="font-family:"Intel Clear","sans-serif";color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">d29) init: failsafe main process (1412) killed by TERM signal<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) init: bluetooth main process (1574) terminated with status 1<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) init: bluetooth main process ended, respawning<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) init: bluetooth main process (1642) terminated with status 1<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) init: bluetooth main process ended, respawning<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) init: bluetooth main process (1689) terminated with status 1<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) init: bluetooth respawning too fast, stopped<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) e1000: eth3 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] failed to retrieve link info, disabling eDP<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) i915 0000:00:02.0: Direct firmware load for i915/skl_guc_ver4.bin failed with e<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) rror -2SUBSYSTEM=pciDEVICE=+pci:0000:00:02.0<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm:intel_guc_ucode_init [i915]] *ERROR* Failed to fetch GuC firmware from i91<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) 5/skl_guc_ver4.bin (error -2)<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] VGT ballooning configuration:<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] Mappable graphic memory: base 0x1e000000 size 131072KiB<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] Unmappable graphic memory: base 0x88000000 size 393216KiB<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] balloon space: range [ 0x40000000 - 0x88000000 ] 1179648 KiB.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] balloon space: range [ 0xa0000000 - 0xfffff000 ] 1572860 KiB.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] balloon space: range [ 0x0 - 0x1e000000 ] 491520 KiB.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] balloon space: range [ 0x26000000 - 0x40000000 ] 425984 KiB.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] VGT balloon successfully<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">[ 4506.568318] vGT info:(ring_pp_mode_write:744) EXECLIST enabling on ring 0.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">[ 4506.576307] vGT-3: add to render run queue!<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">[ 4506.582888] vGT info:(ring_pp_mode_write:744) EXECLIST enabling on ring 1.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">[ 4506.591714] vGT info:(ring_pp_mode_write:744) EXECLIST enabling on ring 2.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">[ 4506.600092] vGT info:(ring_pp_mode_write:744) EXECLIST enabling on ring 3.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;mso-para-margin-left:2.0gd;text-align:left">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">[ 4506.608928] vGT info:(ring_pp_mode_write:744) EXECLIST enabling on ring 4.<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm:intel_opregion_init [i915]] *ERROR* No ACPI video bus found<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 on minor 0<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) BUG: unable to handle kernel NULL pointer dereference at 00000000000000a0IP: [<<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) ffffffffa025a52b>] intel_fbdev_restore_mode+0x57/0x73 [i915]PGD 38a79067 PUD 38<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) a78067 PMD 0 Oops: 0000 [#1] SMP Modules linked in: fuse microcode parport_pc i<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) 915 drm_kms_helper i2c_algo_bit serio_raw acpi_cpufreq ppdev drm i2c_piix4 lp p<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) arport ext4 crc16 jbd2 mbcache e1000 uhci_hcd ata_generic pata_acpiCPU: 1 PID:<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) 1749 Comm: gpu-manager Tainted: G     U          4.3.0-rc6-vgt+ #1<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) Hardware name: Xen HVM domU, BIOS 4.6.0 01/15/2016<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) task: ffff88003be9d700 ti: ffff880038a80000 task.ti: ffff880038a80000<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) RIP: 0010:[<ffffffffa025a52b>]  [<ffffffffa025a52b>] intel_fbdev_restore_mode+0<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) x57/0x73 [i915]RSP: 0018:ffff880038a83d48  EFLAGS: 00010246<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) RAX: 0000000000000000 RBX: ffff8800357cb800 RCX: ffff88003d2c2400<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) RDX: 0000000080000000 RSI: 0000000000000000 RDI: ffff88003c139060<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) RBP: ffff880038a83d50 R08: 00000000ffffffff R09: ffff88003cc00000<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) R10: ffff88003cc001b0 R11: ffffffffa012c9a3 R12: ffff88003c139000<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) R13: ffff88003c139060 R14: ffff88003ba7d8e0 R15: ffff88003c139088<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) FS:  00007fd3bdce5740(0000) GS:ffff88003d620000(0000) knlGS:0000000000000000<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) CR2: 00000000000000a0 CR3: 0000000000078000 CR4: 00000000003406e0<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) Stack:<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  ffff88003c139000 ffff880038a83d60 ffffffffa028696c ffff880038a83d80 ffffffffa0<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) 1170f7 0000000000000000 ffff88003c139000 ffff880038a83de0 ffffffffa0117592 ffff<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) 880038b87210 ffff88003c139198 0000000000000246Call Trace:<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffffa028696c>] i915_driver_lastclose+0x9/0xb [i915]<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffffa01170f7>] drm_lastclose+0x3a/0x103 [drm]<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffffa0117592>] drm_release+0x3d2/0x40b [drm]<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff81147d26>] __fput+0xec/0x1a7<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff81147e0d>] ____fput+0x9/0xb<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff8106ac15>] task_work_run+0x62/0x78<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff8100380c>] prepare_exit_to_usermode+0x93/0xaf<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff8100398d>] syscall_return_slowpath+0x165/0x19e<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff81155125>] ? do_vfs_ioctl+0x360/0x41a<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff8106ab44>] ? task_work_add+0x3f/0x4e<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff81147e87>] ? fput+0x78/0x7f<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff81144f91>] ? filp_close+0x63/0x6d<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29)  [<ffffffff814f09cc>] int_ret_from_sys_call+0x25/0x8f<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) Code: c6 9c 29 2f a0 48 c7 c7 90 24 2d a0 31 c0 e8 2e 0e ec ff eb 2f 48 8b 43 0<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) 8 48 8d 78 60 e8 68 49 29 e1 48 8b 83 a0 00 00 00 31 f6 <48> 8b b8 a0 00 00 00<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) e8 1b 5f ff ff 48 8b 7b 08 48 83 c7 60 e8 RIP  [<ffffffffa025a52b>] intel_fbdev<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) _restore_mode+0x57/0x73 [i915] RSP <ffff880038a83d48><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) CR2: 00000000000000a0<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) ---[ end trace e656291822c44c35 ]---<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) Kernel panic - not syncing: Fatal exception<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Intel Clear","sans-serif"">(d29) Kernel Offset: disabled<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Intel Clear","sans-serif";color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:SimSun;color:#1F497D">BRs,<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:SimSun;color:#1F497D">Weinan Li</span><span lang="EN-US" style="font-size:10.0pt;font-family:SimSun;color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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