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Date:   Thu, 22 Jul 2021 21:51:18 +0200
From:   Karol Herbst <kherbst@...hat.com>
To:     Ondrej Zary <linux@...y.sk>
Cc:     Christian K├Ânig <christian.koenig@....com>,
        nouveau <nouveau@...ts.freedesktop.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: nouveau broken again on Riva TNT2 in 5.14.0-rc2

hey thanks for the report.

This is a known issue and the fix is pending in drm-mist-fixes and
should land in 5.14 soonish.

On Thu, Jul 22, 2021 at 9:29 PM Ondrej Zary <linux@...y.sk> wrote:
>
> Hello,
> nouveau is broken again:
>
> [   58.795794] BUG: kernel NULL pointer dereference, address: 0000017c
> [   58.795835] #PF: supervisor read access in kernel mode
> [   58.795844] #PF: error_code(0x0000) - not-present page
> [   58.795851] *pde = 00000000
> [   58.795862] Oops: 0000 [#1] SMP
> [   58.795875] CPU: 0 PID: 1730 Comm: Xorg Not tainted 5.14.0-rc2+ #391
> [   58.795886] Hardware name: VIA Technologies, Inc. VT82C694X/694X, BIOS 6.00 PG 02/19/2002
> [   58.795894] EIP: nouveau_bo_wr16+0x8/0x27 [nouveau]
> [   58.796716] Code: 85 ff 74 0d 80 7d f3 00 74 07 80 a6 c0 01 00 00 fe 89 f0 e8 e5 ee ff ff 8d 65 f4 89 f8 5b 5e 5f 5d c3 55 01 d2 89 e5 53 89 c3 <03> 93 7c 01 00 00 0f b7 c1 f6 83 84 01 00 00 80 74 07 e8 8a bc 72
> [   58.796728] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
> [   58.796736] ESI: 00000020 EDI: c18bc600 EBP: c7c49d88 ESP: c7c49d84
> [   58.796744] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00210246
> [   58.796754] CR0: 80050033 CR2: 0000017c CR3: 07e12000 CR4: 00000690
> [   58.796762] Call Trace:
> [   58.796774]  nv04_crtc_cursor_set+0x148/0x1d8 [nouveau]
> [   58.796952]  ? ttm_bo_reserve.constprop.16+0x1c/0x1c [nouveau]
> [   58.797122]  drm_mode_cursor_common+0x13b/0x1ad
> [   58.797150]  ? ttm_bo_reserve.constprop.16+0x1c/0x1c [nouveau]
> [   58.797322]  drm_mode_cursor_ioctl+0x2e/0x36
> [   58.797335]  ? drm_mode_setplane+0x203/0x203
> [   58.797346]  drm_ioctl_kernel+0x66/0x99
> [   58.797366]  drm_ioctl+0x211/0x2d8
> [   58.797377]  ? drm_mode_setplane+0x203/0x203
> [   58.797389]  ? __cond_resched+0x1e/0x22
> [   58.797409]  ? mutex_lock+0xb/0x24
> [   58.797422]  ? rpm_resume.part.14+0x6f/0x362
> [   58.797447]  ? ktime_get_mono_fast_ns+0x5e/0xf2
> [   58.797469]  ? __pm_runtime_resume+0x5b/0x63
> [   58.797480]  nouveau_drm_ioctl+0x65/0x81 [nouveau]
> [   58.797662]  ? nouveau_cli_work+0xc3/0xc3 [nouveau]
> [   58.797838]  vfs_ioctl+0x1a/0x24
> [   58.797850]  __ia32_sys_ioctl+0x6ea/0x704
> [   58.797861]  ? doublefault_shim+0x120/0x120
> [   58.797872]  ? exit_to_user_mode_prepare+0x9e/0x10c
> [   58.797900]  do_int80_syscall_32+0x53/0x6e
> [   58.797910]  entry_INT80_32+0xf0/0xf0
> [   58.797923] EIP: 0xb7f04092
> [   58.797932] Code: 00 00 00 e9 90 ff ff ff ff a3 24 00 00 00 68 30 00 00 00 e9 80 ff ff ff ff a3 e8 ff ff ff 66 90 00 00 00 00 00 00 00 00 cd 80 <c3> 8d b4 26 00 00 00 00 8d b6 00 00 00 00 8b 1c 24 c3 8d b4 26 00
> [   58.797943] EAX: ffffffda EBX: 0000000e ECX: c01c64a3 EDX: bf9a15c0
> [   58.797952] ESI: 00997850 EDI: c01c64a3 EBP: 0000000e ESP: bf9a1574
> [   58.797959] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00200292
> [   58.797972] Modules linked in: i2c_dev nouveau wmi hwmon drm_ttm_helper psmouse serio_raw via_agp sg parport_pc 8139cp parport
> [   58.798016] CR2: 000000000000017c
> [   58.798147] ---[ end trace 732829d39ed65de9 ]---
>
>
> d02117f8efaa5fbc37437df1ae955a147a2a424a is the first bad commit
>
> --
> Ondrej Zary
>

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