[REGRESSION][BISECTED] vmwgfx crashes with command buffer error after update

[Christian Heusel]

Hello Zack,

the user rdkehn (in CC) on the Arch Linux Forums reports that after
updating to the 6.10.4 stable kernel inside of their VM Workstation the
driver crashes with the error attached below. This error is also present
on the latest mainline release 6.11-rc3.

We have bisected the issue together down to the following commit:

    d6667f0ddf46 ("drm/vmwgfx: Fix handling of dumb buffers")

Reverting this commit on top of 6.11-rc3 fixes the issue.

While we were still debugging the issue Brad (also CC'ed) messaged me
that they were seeing similar failures in their ESXi based test
pipelines except for one box that was running on legacy BIOS (so maybe
that is relevant). They noticed this because they had set panic_on_warn.

Cheers,
Chris

---

#regzbot introduced: d6667f0ddf46
#regzbot title: drm/vmwgfx: driver crashes due to command buffer error
#regzbot link: https://bbs.archlinux.org/viewtopic.php?id=298491

---

dmesg snippet:
[   13.297084] ------------[ cut here ]------------
[   13.297086] Command buffer error.
[   13.297139] WARNING: CPU: 0 PID: 186 at drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c:399 vmw_cmdbuf_ctx_process+0x268/0x270 [vmwgfx]
[   13.297160] Modules linked in: uas usb_storage hid_generic usbhid mptspi sr_mod cdrom scsi_transport_spi vmwgfx serio_raw mptscsih ata_generic atkbd drm_ttm_helper libps2 pata_acpi vivaldi_fmap ttm mptbase crc32c_intel xhci_pci intel_agp xhci_pci_renesas ata_piix intel_gtt i8042 serio
[   13.297172] CPU: 0 PID: 186 Comm: irq/16-vmwgfx Not tainted 6.10.4-arch2-1 #1 517ed45cc9c4492ee5d5bfc2d2fe6ef1f2e7a8eb
[   13.297174] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
[   13.297175] RIP: 0010:vmw_cmdbuf_ctx_process+0x268/0x270 [vmwgfx]
[   13.297186] Code: 01 00 01 e8 ba 8c 4f f9 0f 0b 4c 89 ff e8 40 fb ff ff e9 9d fe ff ff 48 c7 c7 99 d9 3f c0 c6 05 52 2f 01 00 01 e8 98 8c 4f f9 <0f> 0b e9 1f fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
[   13.297187] RSP: 0018:ffffb9c1805e3d78 EFLAGS: 00010282
[   13.297188] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000003
[   13.297189] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000001
[   13.297190] RBP: ffff907fc8274c98 R08: 0000000000000000 R09: ffffb9c1805e3bf8
[   13.297191] R10: ffff9086dbdfffa8 R11: 0000000000000003 R12: ffff907fc4db5b00
[   13.297192] R13: ffff907fc83fd318 R14: ffff907fc8274c88 R15: ffff907fc83fd300
[   13.297193] FS:  0000000000000000(0000) GS:ffff9086dbe00000(0000) knlGS:0000000000000000
[   13.297194] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   13.297194] CR2: 0000774dc57671ca CR3: 00000006b9e20005 CR4: 00000000003706f0
[   13.297196] Call Trace:
[   13.297198]  <TASK>
[   13.297199]  ? vmw_cmdbuf_ctx_process+0x268/0x270 [vmwgfx a4fe13044bca4eda782d964fb8c4ca15afb325e9]
[   13.297209]  ? __warn.cold+0x8e/0xe8
[   13.297211]  ? vmw_cmdbuf_ctx_process+0x268/0x270 [vmwgfx a4fe13044bca4eda782d964fb8c4ca15afb325e9]
[   13.297221]  ? report_bug+0xff/0x140
[   13.297222]  ? console_unlock+0x84/0x130
[   13.297225]  ? handle_bug+0x3c/0x80
[   13.297226]  ? exc_invalid_op+0x17/0x70
[   13.297227]  ? asm_exc_invalid_op+0x1a/0x20
[   13.297230]  ? vmw_cmdbuf_ctx_process+0x268/0x270 [vmwgfx a4fe13044bca4eda782d964fb8c4ca15afb325e9]
[   13.297238]  ? vmw_cmdbuf_ctx_process+0x268/0x270 [vmwgfx a4fe13044bca4eda782d964fb8c4ca15afb325e9]
[   13.297245]  vmw_cmdbuf_man_process+0x5d/0x100 [vmwgfx a4fe13044bca4eda782d964fb8c4ca15afb325e9]
[   13.297253]  vmw_cmdbuf_irqthread+0x25/0x30 [vmwgfx a4fe13044bca4eda782d964fb8c4ca15afb325e9]
[   13.297261]  vmw_thread_fn+0x3a/0x70 [vmwgfx a4fe13044bca4eda782d964fb8c4ca15afb325e9]
[   13.297271]  irq_thread_fn+0x20/0x60
[   13.297273]  irq_thread+0x18a/0x270
[   13.297274]  ? __pfx_irq_thread_fn+0x10/0x10
[   13.297276]  ? __pfx_irq_thread_dtor+0x10/0x10
[   13.297277]  ? __pfx_irq_thread+0x10/0x10
[   13.297278]  kthread+0xcf/0x100
[   13.297281]  ? __pfx_kthread+0x10/0x10
[   13.297282]  ret_from_fork+0x31/0x50
[   13.297285]  ? __pfx_kthread+0x10/0x10
[   13.297286]  ret_from_fork_asm+0x1a/0x30
[   13.297288]  </TASK>
[   13.297289] ---[ end trace 0000000000000000 ]---
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