Current mainline

[Steve French]

Has anyone seen this?  I was running some xfstests today on current
mainline (ran same tests yesterday and multiple times last week on
5.11 and did not see this) and hit this multiple times

[  287.702292] ------------[ cut here ]------------
[  287.702296] WARNING: CPU: 5 PID: 8223 at
drivers/gpu/drm/ttm/ttm_bo.c:512 ttm_bo_release+0x2f7/0x350 [ttm]
[  287.702309] Modules linked in: cifs ccm md4 cmac nls_utf8 libarc4
libdes rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace
fscache nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT
ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4
xt_conntrack ebtable_nat ip6table_nat ip6table_mangle ip6table_raw
ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw
iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set
nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables
iptable_filter sunrpc crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel virtio_balloon ip_tables xfs qxl drm_ttm_helper
ttm drm_kms_helper cec drm virtio_net net_failover floppy failover
virtio_blk virtio_console crc32c_intel qemu_fw_cfg [last unloaded:
cifs]
[  287.702352] CPU: 5 PID: 8223 Comm: kworker/5:50 Tainted: G        W
        5.11.0 #1
[  287.702355] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[  287.702357] Workqueue: events qxl_gc_work [qxl]
[  287.702362] RIP: 0010:ttm_bo_release+0x2f7/0x350 [ttm]
[  287.702367] Code: e9 6a fd ff ff e8 c9 e7 46 eb e9 92 fd ff ff 49
8b 7f 90 b9 30 75 00 00 31 d2 be 01 00 00 00 e8 1f 0b 47 eb 49 8b 47
e0 eb a1 <0f> 0b 49 8d 77 08 41 c7 87 94 00 00 00 00 00 00 00 31 d2 4c
89 f7
[  287.702370] RSP: 0018:ffffb2c2c877fda8 EFLAGS: 00010202
[  287.702372] RAX: 0000000000000001 RBX: 000000000000000c RCX: 000000000000000d
[  287.702373] RDX: 0000000000000001 RSI: 0000000000000246 RDI: ffffffffc035a0e8
[  287.702374] RBP: ffff922102e4c688 R08: ffff92210f996050 R09: ffff922110ac5938
[  287.702376] R10: 0000000000000000 R11: ffff922100469240 R12: ffff922110ac5e80
[  287.702377] R13: ffff92210b5509d0 R14: ffff92210b550800 R15: ffff92210b550968
[  287.702383] FS:  0000000000000000(0000) GS:ffff92252bd40000(0000)
knlGS:0000000000000000
[  287.702385] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  287.702386] CR2: 000055617142e5d0 CR3: 0000000334610005 CR4: 00000000003706e0
[  287.702400] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  287.702401] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  287.702403] Call Trace:
[  287.702408]  qxl_bo_unref+0x3a/0x50 [qxl]
[  287.702414]  qxl_release_free_list+0x49/0x90 [qxl]
[  287.702419]  qxl_release_free+0x72/0xe0 [qxl]
[  287.702423]  qxl_garbage_collect+0xd1/0x180 [qxl]
[  287.702427]  process_one_work+0x1c0/0x390
[  287.702438]  worker_thread+0x30/0x390
[  287.702441]  ? process_one_work+0x390/0x390
[  287.702444]  kthread+0x117/0x130
[  287.702448]  ? kthread_park+0x90/0x90
[  287.702450]  ret_from_fork+0x22/0x30
[  287.702457] ---[ end trace 03e19399d00180a1 ]---
[  287.702539] ------------[ cut here ]------------

-- 
Thanks,

Steve