Console: switching to colour dummy device 80x25
=============================================================================

======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.0/5311 is trying to acquire lock:
ffffffff8eb4bf40 (console_owner){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:305 [inline]
ffffffff8eb4bf40 (console_owner){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline]
ffffffff8eb4bf40 (console_owner){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
ffffffff8eb4bf40 (console_owner){....}-{0:0}, at: console_flush_one_record kernel/printk/printk.c:3246 [inline]
ffffffff8eb4bf40 (console_owner){....}-{0:0}, at: console_flush_all+0x123/0xaf0 kernel/printk/printk.c:3343

but task is already holding lock:
ffff88801af69d98 (&n->list_lock){-.-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:372 [inline]
ffff88801af69d98 (&n->list_lock){-.-.}-{3:3}, at: free_partial mm/slub.c:8009 [inline]
ffff88801af69d98 (&n->list_lock){-.-.}-{3:3}, at: __kmem_cache_shutdown+0x111/0x2a0 mm/slub.c:8058

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&n->list_lock){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
       get_from_partial_node+0x54/0x4c0 mm/slub.c:3817
       get_from_any_partial mm/slub.c:3915 [inline]
       get_from_partial mm/slub.c:3951 [inline]
       ___slab_alloc+0x258/0x950 mm/slub.c:4459
       slab_alloc_node mm/slub.c:4908 [inline]
       kmem_cache_alloc_noprof+0x135/0x5f0 mm/slub.c:4931
       kmem_alloc_batch lib/debugobjects.c:371 [inline]
       fill_pool+0x165/0x610 lib/debugobjects.c:420
       debug_objects_fill_pool lib/debugobjects.c:780 [inline]
       debug_object_activate+0x38d/0x420 lib/debugobjects.c:869
       debug_work_activate kernel/workqueue.c:682 [inline]
       insert_work+0x35/0x330 kernel/workqueue.c:2223
       __queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401
       queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452
       queue_work include/linux/workqueue.h:699 [inline]
       call_usermodehelper_exec+0x28e/0x4b0 kernel/umh.c:433
       kobject_uevent_env+0x685/0x9e0 lib/kobject_uevent.c:635
       device_add+0x544/0xb80 drivers/base/core.c:3738
       device_create_groups_vargs drivers/base/core.c:4454 [inline]
       device_create+0x269/0x300 drivers/base/core.c:4493
       msr_device_create+0x33/0x50 arch/x86/kernel/msr.c:251
       cpuhp_invoke_callback+0x434/0x810 kernel/cpu.c:194
       cpuhp_thread_fun+0x362/0x780 kernel/cpu.c:1109
       smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
       kthread+0x388/0x470 kernel/kthread.c:436
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #3 (&pool->lock){-.-.}-{2:2}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
       __queue_work+0x72f/0x10a0 kernel/workqueue.c:2361
       queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452
       queue_work include/linux/workqueue.h:699 [inline]
       rpm_suspend+0xeca/0x17b0 drivers/base/power/runtime.c:688
       __pm_runtime_idle+0x12f/0x1a0 drivers/base/power/runtime.c:1129
       pm_runtime_put include/linux/pm_runtime.h:551 [inline]
       __device_attach+0x355/0x450 drivers/base/dd.c:1116
       device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
       bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
       device_add+0x7d7/0xb80 drivers/base/core.c:3772
       serial_base_port_add+0x18f/0x270 drivers/tty/serial/serial_base_bus.c:186
       serial_core_port_device_add drivers/tty/serial/serial_core.c:3275 [inline]
       serial_core_register_port+0x37f/0x2840 drivers/tty/serial/serial_core.c:3314
       serial8250_register_8250_port+0x16b4/0x2090 drivers/tty/serial/8250/8250_core.c:828
       serial_pnp_probe+0x56a/0x7f0 drivers/tty/serial/8250/8250_pnp.c:480
       pnp_device_probe+0x30b/0x4c0 drivers/pnp/driver.c:111
       call_driver_probe drivers/base/dd.c:-1 [inline]
       really_probe+0x254/0xae0 drivers/base/dd.c:706
       __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
       driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
       __driver_attach+0x339/0x600 drivers/base/dd.c:1292
       bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383
       bus_add_driver+0x345/0x670 drivers/base/bus.c:763
       driver_register+0x23a/0x320 drivers/base/driver.c:174
       serial8250_init+0x8f/0x160 drivers/tty/serial/8250/8250_platform.c:317
       do_one_initcall+0x250/0x870 init/main.c:1347
       do_initcall_level+0x10a/0x1a0 init/main.c:1409
       do_initcalls+0x59/0xa0 init/main.c:1425
       kernel_init_freeable+0x29d/0x3e0 init/main.c:1658
       kernel_init+0x1d/0x1d0 init/main.c:1548
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #2 (&dev->power.lock){-...}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
       __pm_runtime_resume+0x10f/0x180 drivers/base/power/runtime.c:1196
       pm_runtime_get include/linux/pm_runtime.h:494 [inline]
       __uart_start+0x171/0x460 drivers/tty/serial/serial_core.c:149
       uart_write+0x251/0x9f0 drivers/tty/serial/serial_core.c:629
       process_output_block drivers/tty/n_tty.c:557 [inline]
       n_tty_write+0xd49/0x11e0 drivers/tty/n_tty.c:2366
       iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
       file_tty_write+0x509/0x9c0 drivers/tty/tty_io.c:1081
       new_sync_write fs/read_write.c:595 [inline]
       vfs_write+0x612/0xba0 fs/read_write.c:687
       ksys_write+0x150/0x270 fs/read_write.c:739
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&port_lock_key){-...}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
       uart_port_lock_irqsave include/linux/serial_core.h:719 [inline]
       serial8250_console_write+0x153/0x1ba0 drivers/tty/serial/8250/8250_port.c:3344
       console_emit_next_record kernel/printk/printk.c:3183 [inline]
       console_flush_one_record kernel/printk/printk.c:3269 [inline]
       console_flush_all+0x6ea/0xaf0 kernel/printk/printk.c:3343
       __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
       console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
       vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
       _printk+0xdd/0x130 kernel/printk/printk.c:2504
       register_console+0xbc3/0xfc0 kernel/printk/printk.c:4208
       univ8250_console_init+0x3a/0x70 drivers/tty/serial/8250/8250_core.c:515
       console_init+0x10b/0x4a0 kernel/printk/printk.c:4407
       start_kernel+0x238/0x3e0 init/main.c:1112
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x157

-> #0 (console_owner){....}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x1520/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
       console_lock_spinning_enable kernel/printk/printk.c:1902 [inline]
       console_emit_next_record kernel/printk/printk.c:3177 [inline]
       console_flush_one_record kernel/printk/printk.c:3269 [inline]
       console_flush_all+0x693/0xaf0 kernel/printk/printk.c:3343
       __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
       console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
       vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
       _printk+0xdd/0x130 kernel/printk/printk.c:2504
       __slab_bug+0x6e/0xd0 mm/slub.c:1144
       slab_bug+0x57/0x80 mm/slub.c:1155
       list_slab_objects+0x35/0x1a0 mm/slub.c:7978
       free_partial mm/slub.c:8015 [inline]
       __kmem_cache_shutdown+0x1a5/0x2a0 mm/slub.c:8058
       kmem_cache_destroy+0x98/0x180 mm/slab_common.c:569
       virtio_gpu_free_vbufs+0x40/0x70 drivers/gpu/drm/virtio/virtgpu_vq.c:86
       virtio_gpu_release+0x55/0x140 drivers/gpu/drm/virtio/virtgpu_kms.c:312
       drm_dev_release drivers/gpu/drm/drm_drv.c:912 [inline]
       kref_put include/linux/kref.h:65 [inline]
       drm_dev_put+0xa9/0x120 drivers/gpu/drm/drm_drv.c:948
       virtio_dev_remove+0x9c/0x1b0 drivers/virtio/virtio.c:375
       device_remove drivers/base/dd.c:616 [inline]
       __device_release_driver drivers/base/dd.c:1349 [inline]
       device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
       bus_remove_device+0x444/0x560 drivers/base/bus.c:664
       device_del+0x524/0x8f0 drivers/base/core.c:3961
       device_unregister+0x21/0xf0 drivers/base/core.c:4002
       unregister_virtio_device+0x37/0x60 drivers/virtio/virtio.c:594
       virtio_pci_remove+0x7f/0xf0 drivers/virtio/virtio_pci_common.c:758
       pci_device_remove+0x99/0x1c0 drivers/pci/pci-driver.c:512
       device_remove drivers/base/dd.c:616 [inline]
       __device_release_driver drivers/base/dd.c:1349 [inline]
       device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
       pci_stop_dev drivers/pci/remove.c:27 [inline]
       pci_stop_bus_device+0xf6/0x120 drivers/pci/remove.c:93
       pci_stop_and_remove_bus_device drivers/pci/remove.c:128 [inline]
       pci_stop_and_remove_bus_device_locked+0x77/0xb0 drivers/pci/remove.c:136
       remove_store+0xe5/0x150 drivers/pci/pci-sysfs.c:523
       kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
       new_sync_write fs/read_write.c:595 [inline]
       vfs_write+0x612/0xba0 fs/read_write.c:687
       ksys_write+0x150/0x270 fs/read_write.c:739
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  console_owner --> &pool->lock --> &n->list_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&n->list_lock);
                               lock(&pool->lock);
                               lock(&n->list_lock);
  lock(console_owner);

 *** DEADLOCK ***

11 locks held by syz.0.0/5311:
 #0: ffff888000bff0f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320 fs/file.c:1259
 #1: ffff88801fa76450 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2733 [inline]
 #1: ffff88801fa76450 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #2: ffff88801f4f1c80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540 fs/kernfs/file.c:336
 #3: ffffffff8f39ac60 (pci_rescan_remove_lock){+.+.}-{4:4}, at: pci_stop_and_remove_bus_device_locked+0x13/0xb0 drivers/pci/remove.c:135
 #4: ffff88801f85a1f8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline]
 #4: ffff88801f85a1f8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1171 [inline]
 #4: ffff88801f85a1f8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880 drivers/base/dd.c:1369
 #5: ffff8880331761b0 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline]
 #5: ffff8880331761b0 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1171 [inline]
 #5: ffff8880331761b0 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880 drivers/base/dd.c:1369
 #6: ffffffff8e9e75f0 (cpu_hotplug_lock){++++}-{0:0}, at: kmem_cache_destroy+0x60/0x180 mm/slab_common.c:556
 #7: ffffffff8ec69f88 (slab_mutex){+.+.}-{4:4}, at: kmem_cache_destroy+0x6e/0x180 mm/slab_common.c:557
 #8: ffff88801af69d98 (&n->list_lock){-.-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:372 [inline]
 #8: ffff88801af69d98 (&n->list_lock){-.-.}-{3:3}, at: free_partial mm/slub.c:8009 [inline]
 #8: ffff88801af69d98 (&n->list_lock){-.-.}-{3:3}, at: __kmem_cache_shutdown+0x111/0x2a0 mm/slub.c:8058
 #9: ffffffff8eb4bfa0 (console_lock){+.+.}-{0:0}, at: _printk+0xdd/0x130 kernel/printk/printk.c:2504
 #10: ffffffff8ea33838 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:305 [inline]
 #10: ffffffff8ea33838 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline]
 #10: ffffffff8ea33838 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
 #10: ffffffff8ea33838 (console_srcu){....}-{0:0}, at: console_flush_one_record kernel/printk/printk.c:3246 [inline]
 #10: ffffffff8ea33838 (console_srcu){....}-{0:0}, at: console_flush_all+0x123/0xaf0 kernel/printk/printk.c:3343

stack backtrace:
CPU: 0 UID: 0 PID: 5311 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1520/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 console_lock_spinning_enable kernel/printk/printk.c:1902 [inline]
 console_emit_next_record kernel/printk/printk.c:3177 [inline]
 console_flush_one_record kernel/printk/printk.c:3269 [inline]
 console_flush_all+0x693/0xaf0 kernel/printk/printk.c:3343
 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
 console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
 _printk+0xdd/0x130 kernel/printk/printk.c:2504
 __slab_bug+0x6e/0xd0 mm/slub.c:1144
 slab_bug+0x57/0x80 mm/slub.c:1155
 list_slab_objects+0x35/0x1a0 mm/slub.c:7978
 free_partial mm/slub.c:8015 [inline]
 __kmem_cache_shutdown+0x1a5/0x2a0 mm/slub.c:8058
 kmem_cache_destroy+0x98/0x180 mm/slab_common.c:569
 virtio_gpu_free_vbufs+0x40/0x70 drivers/gpu/drm/virtio/virtgpu_vq.c:86
 virtio_gpu_release+0x55/0x140 drivers/gpu/drm/virtio/virtgpu_kms.c:312
 drm_dev_release drivers/gpu/drm/drm_drv.c:912 [inline]
 kref_put include/linux/kref.h:65 [inline]
 drm_dev_put+0xa9/0x120 drivers/gpu/drm/drm_drv.c:948
 virtio_dev_remove+0x9c/0x1b0 drivers/virtio/virtio.c:375
 device_remove drivers/base/dd.c:616 [inline]
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
 bus_remove_device+0x444/0x560 drivers/base/bus.c:664
 device_del+0x524/0x8f0 drivers/base/core.c:3961
 device_unregister+0x21/0xf0 drivers/base/core.c:4002
 unregister_virtio_device+0x37/0x60 drivers/virtio/virtio.c:594
 virtio_pci_remove+0x7f/0xf0 drivers/virtio/virtio_pci_common.c:758
 pci_device_remove+0x99/0x1c0 drivers/pci/pci-driver.c:512
 device_remove drivers/base/dd.c:616 [inline]
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
 pci_stop_dev drivers/pci/remove.c:27 [inline]
 pci_stop_bus_device+0xf6/0x120 drivers/pci/remove.c:93
 pci_stop_and_remove_bus_device drivers/pci/remove.c:128 [inline]
 pci_stop_and_remove_bus_device_locked+0x77/0xb0 drivers/pci/remove.c:136
 remove_store+0xe5/0x150 drivers/pci/pci-sysfs.c:523
 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe316b9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe312ff4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe316e25fa0 RCX: 00007fe316b9e0d9
RDX: 0000000000000001 RSI: 0000200000000800 RDI: 0000000000000004
RBP: 00007fe316c35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe316e26038 R14: 00007fe316e25fa0 R15: 00007fff422dd578
 </TASK>
BUG virtio-gpu-vbufs (Not tainted): Objects remaining on __kmem_cache_shutdown()
-----------------------------------------------------------------------------

Object 0xffff888012b51348 @offset=840
Object 0xffff888012b51460 @offset=1120
Slab 0xffffea00004ad440 objects=14 used=2 fp=0xffff888012b51118 flags=0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
------------[ cut here ]------------
1
WARNING: mm/slub.c:1244 at __slab_err+0x15/0x20 mm/slub.c:1244, CPU#0: syz.0.0/5311
Modules linked in:
CPU: 0 UID: 0 PID: 5311 Comm: syz.0.0 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__slab_err+0x15/0x20 mm/slub.c:1244
Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e8 2b 00 00 00 bf 05 00 00 00 be 01 00 00 00 e8 fc a7 5e 00 90 <0f> 0b 90 c3 cc cc cc cc cc 66 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0000:ffffc9000de7f6d8 EFLAGS: 00010083
RAX: ffffffff8186dc3a RBX: ffff888034ca2c80 RCX: 0000000000100000
RDX: ffffc9000eb82000 RSI: 0000000000067f74 RDI: 0000000000067f75
RBP: ffffea0000480710 R08: ffffffff9373f0c7 R09: 1ffffffff26e7e18
R10: dffffc0000000000 R11: fffffbfff26e7e19 R12: ffffea00007e70d0
R13: ffffea00004ad440 R14: ffffc9000de7f6f0 R15: ffff88801af69d80
FS:  00007fe312ff56c0(0000) GS:ffff88808c549000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe30b473000 CR3: 000000004342f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 free_partial mm/slub.c:8015 [inline]
 __kmem_cache_shutdown+0x1a5/0x2a0 mm/slub.c:8058
 kmem_cache_destroy+0x98/0x180 mm/slab_common.c:569
 virtio_gpu_free_vbufs+0x40/0x70 drivers/gpu/drm/virtio/virtgpu_vq.c:86
 virtio_gpu_release+0x55/0x140 drivers/gpu/drm/virtio/virtgpu_kms.c:312
 drm_dev_release drivers/gpu/drm/drm_drv.c:912 [inline]
 kref_put include/linux/kref.h:65 [inline]
 drm_dev_put+0xa9/0x120 drivers/gpu/drm/drm_drv.c:948
 virtio_dev_remove+0x9c/0x1b0 drivers/virtio/virtio.c:375
 device_remove drivers/base/dd.c:616 [inline]
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
 bus_remove_device+0x444/0x560 drivers/base/bus.c:664
 device_del+0x524/0x8f0 drivers/base/core.c:3961
 device_unregister+0x21/0xf0 drivers/base/core.c:4002
 unregister_virtio_device+0x37/0x60 drivers/virtio/virtio.c:594
 virtio_pci_remove+0x7f/0xf0 drivers/virtio/virtio_pci_common.c:758
 pci_device_remove+0x99/0x1c0 drivers/pci/pci-driver.c:512
 device_remove drivers/base/dd.c:616 [inline]
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
 pci_stop_dev drivers/pci/remove.c:27 [inline]
 pci_stop_bus_device+0xf6/0x120 drivers/pci/remove.c:93
 pci_stop_and_remove_bus_device drivers/pci/remove.c:128 [inline]
 pci_stop_and_remove_bus_device_locked+0x77/0xb0 drivers/pci/remove.c:136
 remove_store+0xe5/0x150 drivers/pci/pci-sysfs.c:523
 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe316b9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe312ff4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe316e25fa0 RCX: 00007fe316b9e0d9
RDX: 0000000000000001 RSI: 0000200000000800 RDI: 0000000000000004
RBP: 00007fe316c35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe316e26038 R14: 00007fe316e25fa0 R15: 00007fff422dd578
 </TASK>