Comment # 3
on bug 104825
from mlen
I tested amd-staging-drm-next with HEAD at
f1367d12f5fabb04789c7772594887434c8d9e8b. This time the unbind succeeded, but
there are still some errors logged and kernel reports locking problem in
amdgpu:
[ 77.098923] [drm] amdgpu: finishing device.
[ 77.458614] [drm:gfx_v8_0_hw_fini] *ERROR* KCQ disabled failed
(scratch(0xC040)=0x00000000)
[ 77.481247] IPv6: ADDRCONF(NETDEV_UP): docker0: link is not ready
[ 77.653815] [drm:gfx_v8_0_hw_fini] *ERROR* KCQ disabled failed
(scratch(0xC040)=0x00000000)
[ 77.845085] [drm:gfx_v8_0_hw_fini] *ERROR* KCQ disabled failed
(scratch(0xC040)=0x00000000)
[ 77.855055] IPv6: ADDRCONF(NETDEV_CHANGE): virbr10: link becomes ready
[ 78.036695] [drm:gfx_v8_0_hw_fini] *ERROR* KCQ disabled failed
(scratch(0xC040)=0x00000000)
[ 78.233244] [drm:gfx_v8_0_hw_fini] *ERROR* KCQ disabled failed
(scratch(0xC040)=0x00000000)
[ 78.425058] [drm:gfx_v8_0_hw_fini] *ERROR* KCQ disabled failed
(scratch(0xC040)=0x00000000)
[ 78.616635] [drm:gfx_v8_0_hw_fini] *ERROR* KCQ disabled failed
(scratch(0xC040)=0x00000000)
[ 78.808323] [drm:gfx_v8_0_hw_fini] *ERROR* KCQ disabled failed
(scratch(0xC040)=0x00000000)
[ 78.810659] amdgpu 0000:03:00.0: 00000000a667dd57 unpin not necessary
[ 78.810672] amdgpu 0000:03:00.0: 00000000a7594a2b unpin not necessary
[ 78.811733] =====================================
[ 78.813109] WARNING: bad unlock balance detected!
[ 78.813947] 4.15.0-rc4+ #2 Not tainted
[ 78.814835] -------------------------------------
[ 78.815731] openrc-run.sh/3931 is trying to release lock
(&(&mgr->lock)->rlock) at:
[ 78.816646] [<000000006fd39549>] amdgpu_gtt_mgr_fini+0x22/0x37
[ 78.817531] but there are no more locks to release!
[ 78.818446]
other info that might help us debug this:
[ 78.820208] 5 locks held by openrc-run.sh/3931:
[ 78.821127] #0: (sb_writers#6){....}, at: [<00000000322e5044>]
vfs_write+0x87/0xe2
[ 78.822051] #1: (&of->mutex){....}, at: [<00000000660270c4>]
kernfs_fop_write+0xca/0x156
[ 78.823007] #2: (kn->count#211){....}, at: [<000000000634dafb>]
kernfs_fop_write+0xd2/0x156
[ 78.823936] #3: (&dev->mutex){....}, at: [<00000000c386f49f>]
unbind_store+0x58/0x90
[ 78.824912] #4: (&dev->mutex){....}, at: [<00000000eefcc37f>]
device_release_driver_internal+0x2f/0x1f3
[ 78.825861]
stack backtrace:
[ 78.827764] CPU: 7 PID: 3931 Comm: openrc-run.sh Not tainted 4.15.0-rc4+ #2
[ 78.828747] Hardware name: ASUSTeK COMPUTER INC. Z10PE-D16 WS/Z10PE-D16 WS,
BIOS 3407 03/10/2017
[ 78.829718] Call Trace:
[ 78.830717] dump_stack+0x67/0x8e
[ 78.831689] ? amdgpu_gtt_mgr_fini+0x22/0x37
[ 78.832687] print_unlock_imbalance_bug+0xcc/0xd3
[ 78.833657] lock_release+0x134/0x267
[ 78.834646] ? _raw_spin_unlock+0x2e/0x40
[ 78.835605] _raw_spin_unlock+0x1c/0x40
[ 78.836586] amdgpu_gtt_mgr_fini+0x22/0x37
[ 78.837549] ttm_bo_clean_mm+0x79/0xab
[ 78.838544] amdgpu_ttm_fini+0x75/0x11c
[ 78.839507] amdgpu_bo_fini+0xe/0x2d
[ 78.840495] gmc_v8_0_sw_fini+0x2e/0x49
[ 78.841454] amdgpu_device_ip_fini+0x21f/0x2d3
[ 78.842439] amdgpu_device_fini+0x4c/0x125
[ 78.843394] amdgpu_driver_unload_kms+0x63/0x76
[ 78.844373] drm_dev_unregister+0x49/0xc3
[ 78.845318] amdgpu_pci_remove+0x19/0x37
[ 78.846244] pci_device_remove+0x36/0x86
[ 78.847190] device_release_driver_internal+0x122/0x1f3
[ 78.848120] unbind_store+0x60/0x90
[ 78.849069] kernfs_fop_write+0x10e/0x156
[ 78.849997] __vfs_write+0x31/0xcc
[ 78.850937] ? preempt_count_sub+0x8b/0x94
[ 78.851871] ? __sb_start_write+0xc0/0x180
[ 78.852828] vfs_write+0xa5/0xe2
[ 78.853755] SyS_write+0x5f/0xa3
[ 78.854708] do_syscall_64+0x6c/0x7b
[ 78.855630] entry_SYSCALL64_slow_path+0x25/0x25
[ 78.856583] RIP: 0033:0x7fc5804b6408
[ 78.857511] RSP: 002b:00007ffd95228060 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
[ 78.858484] RAX: ffffffffffffffda RBX: 000000000000000d RCX:
00007fc5804b6408
[ 78.859438] RDX: 000000000000000d RSI: 000055b229e9e890 RDI:
0000000000000001
[ 78.860419] RBP: 000055b229e9e890 R08: 000000000000000a R09:
000055b229ea45f0
[ 78.861379] R10: 000000000000009b R11: 0000000000000246 R12:
000000000000000d
[ 78.862364] R13: 0000000000000001 R14: 00007fc580783740 R15:
000000000000000d
[ 78.863411] [drm] amdgpu: ttm finalized
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