Nouveau - Jan 2018 - [Bug 104609] New: [G96, 9500 GT] Removing nouveau module results in BUG: unable to handle kernel NULL pointer dereference at 00000000000000b8

https://bugs.freedesktop.org/show_bug.cgi?id=104609

            Bug ID: 104609
           Summary: [G96, 9500 GT] Removing nouveau module results in BUG:
                    unable to handle kernel NULL pointer dereference at
                    00000000000000b8
           Product: Mesa
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: vedran at miletic.net
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 136693
  --> https://bugs.freedesktop.org/attachment.cgi?id=136693&action=edit
dmesg

Description of problem:
Removing nouveau module using modprobe -r results in BUG: unable to handle
kernel NULL pointer dereference at 00000000000000b8

Version-Release number of selected component (if applicable):
Linux 4.14.0-3-amd64 (Debian 4.14.12-2)

How reproducible:
Didn't try.

Steps to Reproduce:
1. sudo modprobe -r nouveau
2.
3.

Actual results:
[466017.592089] BUG: unable to handle kernel NULL pointer dereference at
00000000000000b8
[466017.592089] IP: nouveau_fbcon_fini+0xb8/0x120 [nouveau]
[466017.592089] PGD 0 P4D 0 
[466017.592089] Oops: 0000 [#1] SMP NOPTI
[466017.592089] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs vfat msdos
fat jfs xfs dm_mod cfg80211 rfkill snd_hrtimer snd_seq_midi snd_seq_midi_event
snd_rawmidi snd_seq snd_seq_device iptable_filter fuse tun powernow_k8
amd64_edac_mod edac_mce_amd nouveau(-) kvm_amd kvm irqbypass mxm_wmi wmi video
ppdev ttm drm_kms_helper evdev drm snd_hda_codec_realtek snd_hda_codec_generic
i2c_algo_bit snd_hda_intel serio_raw snd_hda_codec pcspkr snd_hda_core k8temp
snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_timer sg snd soundcore
parport_pc shpchp parport asus_atk0110 button binfmt_misc sunrpc loop ecryptfs
ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto ecb crypto_simd
cryptd glue_helper aes_x86_64 uas usb_storage hid_generic usbhid hid btrfs
zstd_decompress zstd_compress xxhash sr_mod cdrom
[466017.592089]  raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx xor sd_mod raid6_pq libcrc32c crc32c_generic raid1 raid0
multipath linear md_mod ata_generic psmouse r8169 via_rhine mii uhci_hcd
ehci_pci ehci_hcd i2c_viapro sata_via pata_via usbcore libata usb_common
scsi_mod floppy
[466017.592089] CPU: 1 PID: 26532 Comm: modprobe Not tainted 4.14.0-3-amd64 #1
Debian 4.14.12-2
[466017.592089] Hardware name: stem manufacturer System Product
Name/M2VTVM-VM890, BIOS 1201    03/17/2008
[466017.592089] task: ffff89b926dfc100 task.stack: ffffaae4c324c000
[466017.592089] RIP: 0010:nouveau_fbcon_fini+0xb8/0x120 [nouveau]
[466017.592089] RSP: 0018:ffffaae4c324fdb8 EFLAGS: 00010282
[466017.592089] RAX: 0000000000000000 RBX: ffff89b97b7ff800 RCX:
fffff31601e3815f
[466017.592089] RDX: 000000000000003b RSI: ffff89b97c3c3680 RDI:
0000000000000282
[466017.592089] RBP: ffff89b97b062000 R08: 0000000000000002 R09:
ffff89b976db8540
[466017.592089] R10: ffffaae4c324fdb8 R11: 0000000000000001 R12:
0000000000000000
[466017.592089] R13: ffffffffc0d52770 R14: ffff89b97cab4100 R15:
ffffffffc0d527e8
[466017.592089] FS:  00007fc9e0352540(0000) GS:ffff89b97fd00000(0000)
knlGS:0000000000000000
[466017.592089] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[466017.592089] CR2: 00000000000000b8 CR3: 0000000029b5e000 CR4:
00000000000006e0
[466017.592089] Call Trace:
[466017.592089]  nouveau_drm_unload+0x37/0xd0 [nouveau]
[466017.592089]  drm_dev_unregister+0x3c/0xe0 [drm]
[466017.592089]  drm_put_dev+0x2e/0x60 [drm]
[466017.592089]  nouveau_drm_device_remove+0x44/0x70 [nouveau]
[466017.592089]  pci_device_remove+0x36/0xb0
[466017.592089]  device_release_driver_internal+0x157/0x210
[466017.592089]  driver_detach+0x39/0x70
[466017.592089]  bus_remove_driver+0x51/0xd0
[466017.592089]  pci_unregister_driver+0x2a/0xa0
[466017.592089]  nouveau_drm_exit+0x15/0x1c5 [nouveau]
[466017.592089]  SyS_delete_module+0x18c/0x290
[466017.592089]  system_call_fast_compare_end+0xc/0x6f
[466017.592089] RIP: 0033:0x7fc9dfefcad7
[466017.592089] RSP: 002b:00007ffea4c86a38 EFLAGS: 00000206
[466017.592089] Code: e8 6e 59 f4 ff 48 8d bb 10 01 00 00 e8 62 59 f4 ff 48 8b
9d a0 09 00 00 4c 8b 23 48 89 df e8 30 eb d2 ff 48 89 df e8 58 f2 d2 ff
<49> 8b
bc 24 b8 00 00 00 48 85 ff 74 31 49 8d b4 24 c0 00 00 00 
[466017.592089] RIP: nouveau_fbcon_fini+0xb8/0x120 [nouveau] RSP:
ffffaae4c324fdb8
[466017.592089] CR2: 00000000000000b8
[466017.596375] ---[ end trace e8cb85440e5df03c ]---

Expected results:
No error.

Additional info:
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation G96 [GeForce 9500
GT] [10de:0640] (rev a1)

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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Did you follow proper instructions and disconnected vtcon first?

https://nouveau.freedesktop.org/wiki/KernelModeSetting/

"Deactivating KMS and unloading Nouveau"

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--- Comment #2 from Vedran Miletić <vedran at miletic.net> ---
No, I can retry. What are the odds that ther machine reboots nicely without
hard reset after this? I have:

$ lsmod | grep nouveau
nouveau              1904640  -1
...

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GitLab Migration User <gitlab-migration at fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #3 from GitLab Migration User <gitlab-migration at
fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1146.

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