[6.13.6 stable regression?] Nouveau reboot failure in r535_gsp_msg_recv()

[David Woodhouse]

I have a Thinkpad P1 Gen6 with combined Intel + NVIDIA graphics:

00:02.0 VGA compatible controller [0300]: Intel Corporation Raptor Lake-P [Iris Xe Graphics] [8086:a7a0] (rev 04)
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation AD107GLM [RTX 2000 Ada Generation Laptop GPU] [10de:28b8] (rev a1)

There's supposed to be USB-C display support but that's never worked
and I have no idea how to even start debugging it.

It does have an HDMI port in the laptop itself, which does sometimes
work. I've grown accustomed to having to reboot the laptop to get it to
output to that port, like it's the 1990s again.

When I updated from 6.13.4 to 6.13.6 even *that* stopped working
because the laptop doesn't even reboot so I have to power cycle it.
This time at least I have some way to start debugging it; there's a
backtrace on screen.

Image to text below; full images at 
 http://david.woodhou.se/PXL_20250326_092807612.MP.jpg
 http://david.woodhou.se/PXL_20250326_092800399.MP.jpg
 http://david.woodhou.se/PXL_20250313_153455231.MP.jpg


[608593.5728743 CPU: 15 UID: 626640614 PID: 17529 Comm: WebKitWebProces Taint
[608593.576062] Tainted: [W]=WARN
C608593.579235] Hardware name: LENOVO 21FVS16V08/21FVS16V80, BIOS N3ZET45W (1.
[608593.582441] RIP: 0010:r535_gsp_msgq_wait+0x1c4/0x1f0 [nouveau]
[608593.585775] Code: 8b 45 cc 31 d2 05 2f 10 00 00 Od ff Of 00 00 48 c1 e8 Bc
[608593.589119] RSP: 0018: ffffb169c23e7818 EFLAGS: 00010246
[608593.592450] RAX: 0000000000000000 RBX: 0000000000000028 RCX: 0000000000000
[608593.595812] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000
[608593.599162] RBP: ffffb169c23e7858 R08: 000-----------00 R09: 000000
[608593.602505] R10: 00000-0000-00-00 R11: 000-----------00 R12: 00000000
[608593.605829] R13: ffff9b2fa3362000 R14: ffffb169c23e7878 R15: 00000000000000
[608593.609167] FS: 0000752bd596fbc0(0000) GS: ffff9b463f580000(0000) kn1GS:000
[608593.612510] CS: 0010 DS: 0000 ES: 0000 CRO: 0000000080050033
[608593.615870] CR2: 00007ea21329a7b4 CR3: 00000002b2782005 CR4: 0000000000f72e1
[608593.619235] PKRU: 55555554
[608593.622604] Call Trace:
[608593.625968] <TASK>
[608593.629323] ? show_regs+0x6c/0x80
[608593.632693] ?__warn+0x8d/0x150
[608593.636055] ? r535_gsp_msgq_wait+0x1c4/0x1f0 [nouveau]
[608593.639533] ? report_bug+0x182/0x1b0
[608593.642908] ? handle_bug+0x6e/0xb0
[608593.646279] ? exc_invalid_op+0x18/0x80
[608593.649640] ?asm_exc_invalid_op+0x1b/0x20
[608593.652991] ? r535_gsp_msgq_wait+0x1c4/0x1f0 [nouveau]
[608593.656476] ? r535_gsp_msgq_wait+0x8a/0x1f0 [nouveau]
[608593.659943] r535_gsp_msg_recv+0x51/0x280 [nouveau]
[608593.663419] r535_gsp_rpc_send+0x1c9/0x2d0 [nouveau]
[688593.666895]
[608593.670362] ? __kvmalloc_node_noprof+0x24/0x100
r535_gsp_rpc_push+0x156/0x160 [nouveau]
[608593.673731] r535_gsp_rpc_rm_free+0x76/0xe0 [nouveau]
[608593.677217] r535_gr_obj_dtor+0x2b/0x40 [nouveau]
[608593.680696] nvkm_object_dtor+0xb9/0x1b0 [nouveau]
[608593.684088]
[608593.687417]
[608593.690741] nvkm_object_del+0x2b/0xc0 [nouveau]
nvkm_oproxy_dtor+0x30/0x60 [nouveau]
nvkm_object_dtor+0xb9/0x1b0 [nouveau]
[608593.694053] nvkm_object_del+0x2b/0xc0 [nouveau]
[608593.697366]
[608593.700661]
[608593.703958] nvkm_object_dtor+0x66/0x1b0 [nouveau]
nvkm_object_del+0x2b/0xc0 [nouveau]
nvkm_ioctl_del+0x38/0xb0 [nouveau]
[608593.707237] nvkm_ioctl+0x103/0x240 [nouveau]
[608593.710514] nvkm_client_ioctl+0xe/0x20 [nouveau]
[do_syscall_64+0x7e/0x170
[608593.751404]
nvif_object_dtor+0x78/0xb0 [nouveau]
nouveau_channel_del+0x8b/0x110 [nouveau]
nouveau_abi16_chan_fini.isra.0+0x143/0x1d0 [nouveau]
nouveau_abi16_fini+0x8d/0xd0 [nouveau]
nouveau_drm_postclose+0xa9/0x140 [nouveau]
drm_file_free+0x1e5/0x270
drm_release+0xb1/0x130
__fput+0xe5/0x2d0
_fput_sync+0x59/0x80
x64_sys_call+0x1a2d/0x2650
__x64_sys_close+0x3d/0x90
?__handle_mm_fault+AxAn
[608593.7542781
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