Backtrace

WARNING: CPU: 3 PID: 6717 at fs/btrfs/delayed-inode.c:1370 btrfs_assert_delayed_root_empty+0x6c/0x80
Modules linked in: uinput rfcomm snd_seq_dummy snd_hrtimer bridge stp llc ip_set nfnetlink bnep sunrpc vfat fat intel_rapl_msr intel_rapl_common mei_hdcp snd_soc_sst_bytcr_rt5640 intel_powerclamp coretemp gpio_keys kvm_intel kvm irqbypass intel_cstate asus_wmi sparse_keymap pcspkr uvcvideo videobuf2_vmalloc videobuf2_memops extcon_axp288 axp288_fuel_gauge videobuf2_v4l2 axp288_charger videobuf2_common snd_usb_audio joydev videodev r8723bs(C) axp288_adc industrialio snd_usbmidi_lib axp20x_pek snd_hwdep snd_soc_rt5670 snd_rawmidi snd_soc_rt5651 cfg80211 mc mei_txe mei snd_hdmi_lpe_audio intel_xhci_usb_role_switch intel_atomisp2_pm lpc_ich snd_sof_acpi_intel_byt snd_sof_intel_ipc snd_sof_acpi snd_sof_xtensa_dsp snd_sof ledtrig_audio snd_intel_sst_acpi snd_soc_acpi_intel_match snd_soc_acpi snd_soc_rt5645 snd_intel_sst_core snd_soc_rt5640 snd_soc_sst_atom_hifi2_platform snd_soc_rl6231 hci_uart snd_soc_core btqca btrtl btbcm btintel snd_compress snd_intel_dspcfg snd_pcm_dmaengine
 snd_intel_sdw_acpi ac97_bus bluetooth snd_seq snd_seq_device snd_pcm dw_dmac intel_cht_int33fe ecdh_generic rfkill ecc snd_timer snd soundcore soc_button_array acpi_pad intel_int0002_vgpio zram i915 mmc_block i2c_algo_bit drm_kms_helper cec crct10dif_pclmul crc32_pclmul drm crc32c_intel ghash_clmulni_intel wdat_wdt wmi sdhci_acpi video sdhci mmc_core pwm_lpss_platform pwm_lpss fuse [last unloaded: ip_tables]
CPU: 3 PID: 6717 Comm: umount Tainted: G        WC        5.13.19-200.fc34.x86_64 #1
Hardware name: Positivo Informatica SA S14CT01/S14CT01, BIOS 1.0C.X x64 s 06/30/2017
RIP: 0010:btrfs_assert_delayed_root_empty+0x6c/0x80
Code: 2e 8d 50 01 09 c2 78 16 48 89 ef c6 07 00 0f 1f 40 00 48 85 db 75 13 5b 5d c3 31 db eb ea be 01 00 00 00 e8 36 dc 11 00 eb de <0f> 0b 5b 5d c3 be 02 00 00 00 e8 25 dc 11 00 eb cd 0f 1f 00 0f 1f
RSP: 0018:ffffbcb4c02bfd98 EFLAGS: 00010282
RAX: 00000000000000cd RBX: ffff96bcb7ac84e0 RCX: 0000000000000000
RDX: 00000000000000cf RSI: ffff96bce5dab7f8 RDI: ffff96bce5dab7e0
RBP: ffff96bce5dab7e0 R08: ffff96bce5dab7f8 R09: ffff96bce5dab7f8
R10: 0000000000000000 R11: 0000000000000003 R12: ffff96bc860a9000
R13: ffff96bc860a9520 R14: ffff96bc860a9550 R15: 0000000000000000
FS:  00007f6e9b63bc40(0000) GS:ffff96bcf6d80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6e9b8d4ed0 CR3: 0000000005c1a000 CR4: 00000000001006e0
Call Trace:
 btrfs_cleanup_transaction.isra.0+0x36d/0x560
 ? __cancel_work_timer+0xea/0x170
 ? btrfs_discard_cleanup+0x40/0xf0
 close_ctree+0x155/0x2bf
 generic_shutdown_super+0x74/0x110
 kill_anon_super+0x14/0x30
 btrfs_kill_super+0x12/0x20
 deactivate_locked_super+0x36/0xa0
 cleanup_mnt+0x131/0x190
 task_work_run+0x65/0xa0
 exit_to_user_mode_prepare+0x237/0x240
 syscall_exit_to_user_mode+0x18/0x40
 do_syscall_64+0x4d/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6e9b86a38b
Code: 2a 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 8b 15 b9 2a 0c 00 f7 d8
RSP: 002b:00007ffdc21c9388 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 000055ead2a84f20 RCX: 00007f6e9b86a38b
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055ead2a84690
RBP: 000055ead2a84460 R08: 0000000000000000 R09: 00007f6e9b92da60
R10: 000055ead2a85970 R11: 0000000000000246 R12: 0000000000000000
R13: 000055ead2a84690 R14: 000055ead2a84570 R15: 000055ead2a84460