[Bug 106993] general protection fault in mutex_lock / drm_mode_object_unregister when unloading amdgpu

Thu Jun 21 13:40:37 UTC 2018

https://bugs.freedesktop.org/show_bug.cgi?id=106993

            Bug ID: 106993
           Summary: general protection fault in mutex_lock /
                    drm_mode_object_unregister when unloading amdgpu
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: freedesktop at thecybershadow.net

I'm trying to unload amdgpu so that I can pass it to a VM using VFIO. After
stopping Xorg, unbinding framebuffer etc. amdgpu module shows 0 users, however
"modprobe -r amdgpu" hangs, and this appears in dmesg:

[  992.692232] general protection fault: 0000 [#1] PREEMPT SMP PTI
[  992.692237] Modules linked in: dm_mod ccm fuse xt_nat vhost_net vhost tap
xt_CHECKSUM iptable_mangle xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp
devlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep
uinput it87 hwmon_vid snd_hda_codec_hdmi sit tunnel4 ip_tunnel nls_iso8859_1
8021q mrp nls_cp437 vfat fat ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 intel_rapl nf_nat_ipv4 nf_nat nf_conntrack
x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek coretemp amdkfd
snd_hda_codec_generic kvm_intel iTCO_wdt iTCO_vendor_support mxm_wmi
amd_iommu_v2 amdgpu(-) arc4 ath9k kvm ath9k_common ath9k_hw irqbypass chash
crct10dif_pclmul crc32_pclmul gpu_sched ath i2c_algo_bit ghash_clmulni_intel
pcbc aesni_intel ttm mac80211 aes_x86_64 drm_kms_helper
[  992.692279]  crypto_simd cryptd ath3k glue_helper intel_cstate btusb drm
btrtl intel_uncore btbcm snd_hda_intel btintel snd_usb_audio intel_rapl_perf
bluetooth snd_hda_codec uvcvideo cfg80211 snd_usbmidi_lib snd_hda_core
snd_rawmidi videobuf2_vmalloc videobuf2_memops snd_hwdep snd_seq_device
videobuf2_v4l2 i2c_i801 agpgart snd_pcm syscopyarea videobuf2_common snd_timer
ecdh_generic sysfillrect mei_me pl2303 input_leds crc16 snd r8169 rfkill
sysimgblt videodev usbserial mousedev joydev lpc_ich mii e1000e fb_sys_fops mei
soundcore led_class ioatdma media dca shpchp rtc_cmos wmi bridge evdev mac_hid
stp llc tun sg crypto_user ip_tables x_tables btrfs libcrc32c crc32c_generic
xor zstd_decompress zstd_compress xxhash raid6_pq sd_mod sr_mod cdrom
hid_generic usbhid hid isci ahci libsas libahci scsi_transport_sas
[  992.692325]  xhci_pci ehci_pci crc32c_intel xhci_hcd ehci_hcd libata usbcore
usb_common scsi_mod
[  992.692333] CPU: 5 PID: 113 Comm: kworker/5:1 Tainted: G        W        
4.17.2-1-ARCH #1
[  992.692335] Hardware name: Gigabyte Technology Co., Ltd. To be filled by
O.E.M./X79S-UP5, BIOS F5f 03/19/2014
[  992.692351] Workqueue: events drm_connector_free_work_fn [drm]
[  992.692357] RIP: 0010:mutex_lock+0x10/0x20
[  992.692358] RSP: 0018:ffffaadf46edfe18 EFLAGS: 00010246
[  992.692361] RAX: 0000000000000000 RBX: c5f816ba155656e8 RCX:
000000010020001b
[  992.692363] RDX: ffff960e76c09e00 RSI: ffff960e6f2ad818 RDI:
c5f816ba155656e8
[  992.692365] RBP: c5f816ba15565490 R08: 0000000000000001 R09:
ffffffffc0fffa22
[  992.692367] R10: fffffbf4bfbcab00 R11: 000000000000001b R12:
ffff960e6f2ad818
[  992.692369] R13: ffff960e62c192e0 R14: 0ffff960e7f36750 R15:
ffff960e76c7b000
[  992.692372] FS:  0000000000000000(0000) GS:ffff960e7f340000(0000)
knlGS:0000000000000000
[  992.692374] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  992.692376] CR2: 00007ffc558036f8 CR3: 000000044700a005 CR4:
00000000001626e0
[  992.692378] Call Trace:
[  992.692389]  drm_mode_object_unregister+0x1e/0x60 [drm]
[  992.692398]  drm_encoder_cleanup+0x35/0xa0 [drm]
[  992.692442]  dm_dp_mst_connector_destroy+0x35/0x50 [amdgpu]
[  992.692453]  drm_connector_free_work_fn+0x72/0x90 [drm]
[  992.692457]  process_one_work+0x1d1/0x3b0
[  992.692460]  worker_thread+0x2b/0x3d0
[  992.692462]  ? process_one_work+0x3b0/0x3b0
[  992.692465]  kthread+0x112/0x130
[  992.692467]  ? kthread_flush_work_fn+0x10/0x10
[  992.692470]  ret_from_fork+0x35/0x40
[  992.692472] Code: 37 6e 93 ff 0f 1f 80 00 00 00 00 0f 1f 44 00 00 be 02 00
00 00 e9 c1 fa ff ff 90 0f 1f 44 00 00 65 48 8b 14 25 00 5c 01 00 31 c0 <f0> 48
0f b1 17 48 85 c0 74 02 eb d4 c3 0f 1f 00 0f 1f 44 00 00 
[  992.692497] RIP: mutex_lock+0x10/0x20 RSP: ffffaadf46edfe18
[  992.692500] ---[ end trace 841909ebd0d56ac2 ]---

This is on Arch Linux, kernel:
Linux home.thecybershadow.net 4.17.2-1-ARCH #1 SMP PREEMPT Sat Jun 16 11:08:59
UTC 2018 x86_64 GNU/Linux

Using 1 Radeon RX Vega 64 driving 2 monitors, Philips 240BW and Asus PQ321Q.

Full dmesg:
https://dump.thecybershadow.net/27386389f800db8f44b7fe7af422f926/13%3A30%3A08-stdin.txt

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