This happened while adding and then removing a disk on 5.6.3
Label: 'Root' uuid: 58d27dbd-7c1e-4ef7-8d43-e93df1537b08
Total devices 2 FS bytes used 46.00GiB
devid 14 size 100.00GiB used 53.03GiB path /dev/sda1
devid 15 size 100.00GiB used 53.03GiB path /dev/sdf1
Label: 'Boot' uuid: 8f63cd03-67b2-47cd-85ce-ca355769c123
Total devices 1 FS bytes used 71.47MiB
devid 2 size 1.00GiB used 608.00MiB path /dev/sda6
Label: 'Storage' uuid: 1438fdc5-8b2a-47b3-8a5b-eb74cde3df42
Total devices 6 FS bytes used 4.40TiB
devid 1 size 2.73TiB used 2.18TiB path /dev/sdg1
devid 2 size 3.64TiB used 3.09TiB path /dev/mapper/a-storage
devid 7 size 3.64TiB used 3.09TiB path /dev/sdh1
devid 8 size 2.73TiB used 2.18TiB path /dev/sdi1
devid 9 size 19.00GiB used 7.03GiB path /dev/sdf3
devid 10 size 19.00GiB used 7.03GiB path /dev/sda5
Label: 'Backup' uuid: c82771ef-837a-4584-ae4d-4d642d617396
Total devices 7 FS bytes used 1.62TiB
devid 0 size 710.00GiB used 686.00GiB path /dev/sdj1
devid 2 size 640.00GiB used 618.00GiB path /dev/sdc1
devid 3 size 690.00GiB used 668.00GiB path /dev/sde1
devid 5 size 3.00TiB used 1.29TiB path /dev/mapper/a-backup
devid 6 size 710.00GiB used 686.00GiB path /dev/sdk1
devid 7 size 25.00GiB used 12.03GiB path /dev/sdf2
devid 8 size 29.00GiB used 12.03GiB path /dev/sda7
All raid1 except boot.
[67120.563171] sdj: sdj1
[67120.996400] sdj: sdj1
[68661.727453] sdj: sdj1
[68693.715160] sysfs: cannot create duplicate filename '/fs/btrfs/c82771ef-837a-4584-ae4d-4d642d617396/devinfo/9'
[68693.715164] CPU: 1 PID: 4347 Comm: btrfs Not tainted 5.6.3-gentoo-x86_64 #2
[68693.715164] Hardware name: Dell Inc. Precision T3610/, BIOS A03 09/05/2013
[68693.715165] Call Trace:
[68693.715175] dump_stack+0x50/0x70
[68693.715179] sysfs_warn_dup.cold+0x17/0x32
[68693.715181] sysfs_create_dir_ns+0xb1/0xd0
[68693.715183] kobject_add_internal+0xa6/0x230
[68693.715185] kobject_init_and_add+0x71/0xa0
[68693.715189] btrfs_sysfs_add_device_link+0xad/0xf0
[68693.715192] btrfs_init_new_device+0x3ad/0x1130
[68693.715195] ? unlazy_walk+0x46/0x80
[68693.715197] ? terminate_walk+0x5f/0xf0
[68693.715200] ? alloc_set_pte+0xf1/0x580
[68693.715203] ? __kmalloc_track_caller+0xc1/0x120
[68693.715207] ? _copy_from_user+0x37/0x60
[68693.715208] btrfs_ioctl+0x663/0x2dc0
[68693.715210] ? __handle_mm_fault+0xfcf/0x1180
[68693.715212] ? ksys_ioctl+0x69/0xa0
[68693.715213] ksys_ioctl+0x69/0xa0
[68693.715215] __x64_sys_ioctl+0x11/0x20
[68693.715217] do_syscall_64+0x43/0x120
[68693.715219] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[68693.715221] RIP: 0033:0x7fb0bb7a3c57
[68693.715224] Code: 00 00 00 75 0c 48 c7 c0 ff ff ff ff 48 83 c4 18 c3 e8 7d d0 01 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 09 d2 0c 00 f7 d8 64 89 01 48
[68693.715224] RSP: 002b:00007ffd148c3aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[68693.715226] RAX: ffffffffffffffda RBX: 00007ffd148c4c70 RCX: 00007fb0bb7a3c57
[68693.715227] RDX: 00007ffd148c3ae0 RSI: 000000005000940a RDI: 0000000000000003
[68693.715228] RBP: 000055e7c0367a30 R08: 00007ffd148c3ae8 R09: 0000000000000070
[68693.715228] R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000
[68693.715229] R13: 00007ffd148c3ae0 R14: 0000000000000000 R15: 0000000000000003
[68693.715231] kobject_add_internal failed for 9 with -EEXIST, don't try to register things with the same name in the same directory.
[68693.897847] BTRFS info (device sdc1): disk added /dev/sdj1
[69046.339394] BTRFS info (device sdg1): device fsid 1438fdc5-8b2a-47b3-8a5b-eb74cde3df42 devid 2 moved old:/dev/mapper/a-storage new:/dev/dm-1
[69046.348445] BTRFS info (device sdg1): device fsid 1438fdc5-8b2a-47b3-8a5b-eb74cde3df42 devid 2 moved old:/dev/dm-1 new:/dev/mapper/a-storage
[69241.772223] BTRFS info (device sdg1): device fsid 1438fdc5-8b2a-47b3-8a5b-eb74cde3df42 devid 2 moved old:/dev/mapper/a-storage new:/dev/dm-1
[69241.781163] BTRFS info (device sdg1): device fsid 1438fdc5-8b2a-47b3-8a5b-eb74cde3df42 devid 2 moved old:/dev/dm-1 new:/dev/mapper/a-storage
[69303.755177] BTRFS info (device sdc1): resizing devid 5
[69303.755182] BTRFS info (device sdc1): new size for /dev/mapper/a-backup is 3298534883328
[69316.164490] BTRFS info (device sdg1): resizing devid 2
[69316.164496] BTRFS info (device sdg1): new size for /dev/mapper/a-storage is 3999331778560
[69349.811984] ------------[ cut here ]------------
[69349.811991] kobject: '(null)' (00000000aaf0f9ae): is not initialized, yet kobject_put() is being called.
[69349.812021] WARNING: CPU: 3 PID: 6405 at lib/kobject.c:736 kobject_put+0x40/0xb0
[69349.812022] Modules linked in: sha512_generic cifs l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel xt_recent xt_comment ipt_REJECT nf_reject_ipv4 xt_mark iptable_mangle xt_TCPMSS xt_CT iptable_raw xt_multiport xt_NFLOG nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp asn1_decoder nf_nat_sip nf_nat_pptp nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda ts_kmp nf_conntrack_amanda nf_conntrack_sane nf_conntrack_tftp nf_conntrack_sip nf_conntrack_pptp nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp nfsd auth_rpcgss oid_registry nfs_acl xt_nat veth xt_conntrack xt_MASQUERADE nf_conntrack_netlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat ip_tables binfmt_misc hwmon_vid nouveau intel_powerclamp coretemp kvm_intel kvm i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt irqbypass fb_sys_fops pcspkr drm drm_panel_orientation_quirks i2c_i801 nvidiafb cfbfillrect cfbimgblt lpc_ich vgastate mfd_core e1000 e1000e
[69349.812075] r8169 cfbcopyarea realtek wmi libphy xts cbc overlay loop fuse nfs lockd grace sunrpc linear raid10 raid1 raid0 dm_thin_pool dm_snapshot dm_raid raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx md_mod dm_mirror dm_region_hash dm_log dm_cache_smq dm_cache dm_persistent_data dm_bufio dm_bio_prison hid_sunplus hid_samsung hid_pl hid_petalynx hid_gyration usbhid ohci_hcd uhci_hcd usb_storage xhci_plat_hcd xhci_pci xhci_hcd ehci_pci ehci_hcd pata_jmicron pata_amd pata_mpiix hpsa mptsas mpt3sas scsi_transport_sas mptspi scsi_transport_spi mptscsih mptbase sata_inic162x sata_nv sata_sil24 ata_piix ahci libahci nvme nvme_core
[69349.812122] CPU: 3 PID: 6405 Comm: btrfs Not tainted 5.6.3-gentoo-x86_64 #2
[69349.812124] Hardware name: Dell Inc. Precision T3610/, BIOS A03 09/05/2013
[69349.812130] RIP: 0010:kobject_put+0x40/0xb0
[69349.812134] Code: ff 48 8d 7d 38 f0 0f c1 45 38 83 f8 01 74 1f 85 c0 7e 66 5b 5d 41 5c c3 48 8b 37 48 89 fa 48 c7 c7 58 69 da 81 e8 4e c0 92 ff <0f> 0b eb ce 0f b6 45 3c 48 8b 5d 28 4c 8b 65 00 89 c2 83 e2 0c 80
[69349.812136] RSP: 0018:ffffc9000149fd18 EFLAGS: 00010286
[69349.812138] RAX: 0000000000000000 RBX: ffff88854ef1cc00 RCX: 0000000000000007
[69349.812140] RDX: 0000000000000007 RSI: 0000000000000086 RDI: ffff88884fd980b0
[69349.812142] RBP: ffff88854ef1cda0 R08: 00000000000022f4 R09: 0000000000000001
[69349.812143] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8888485b5e00
[69349.812145] R13: ffff8888485b5e00 R14: ffff88854ef1cc00 R15: ffff8888485b5e78
[69349.812148] FS: 00007fe0e36678c0(0000) GS:ffff88884fd80000(0000) knlGS:0000000000000000
[69349.812150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[69349.812152] CR2: 00007fcd3a19e6b8 CR3: 00000001265a6001 CR4: 00000000000606a0
[69349.812153] Call Trace:
[69349.812164] btrfs_sysfs_rm_device_link+0x4e/0xe0
[69349.812170] btrfs_rm_device.cold+0x6d/0x12b
[69349.812174] btrfs_ioctl+0x2a08/0x2dc0
[69349.812180] ? kmem_cache_alloc+0xa0/0x100
[69349.812186] ? _copy_to_user+0x28/0x30
[69349.812189] ? cp_new_stat+0x14b/0x180
[69349.812192] ? __do_sys_newstat+0x48/0x70
[69349.812196] ? ksys_ioctl+0x69/0xa0
[69349.812198] ksys_ioctl+0x69/0xa0
[69349.812201] __x64_sys_ioctl+0x11/0x20
[69349.812205] do_syscall_64+0x43/0x120
[69349.812210] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[69349.812213] RIP: 0033:0x7fe0e3764c57
[69349.812217] Code: 00 00 00 75 0c 48 c7 c0 ff ff ff ff 48 83 c4 18 c3 e8 7d d0 01 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 09 d2 0c 00 f7 d8 64 89 01 48
[69349.812218] RSP: 002b:00007ffd661c0e58 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[69349.812221] RAX: ffffffffffffffda RBX: 00007ffd661c3010 RCX: 00007fe0e3764c57
[69349.812223] RDX: 00007ffd661c1e80 RSI: 000000005000943a RDI: 0000000000000003
[69349.812225] RBP: 0000000000000000 R08: 00007ffd661c1eb8 R09: 0000000000000231
[69349.812226] R10: 000055da8079e81b R11: 0000000000000202 R12: 0000000000000000
[69349.812228] R13: 000055da80841680 R14: 00007ffd661c1e80 R15: 0000000000000003
[69349.812231] ---[ end trace 8fa4b24e88c5878b ]---
[69349.812232] ------------[ cut here ]------------
[69349.812234] refcount_t: underflow; use-after-free.
[69349.812247] WARNING: CPU: 3 PID: 6405 at lib/refcount.c:28 refcount_warn_saturate+0xa6/0xf0
[69349.812247] Modules linked in: sha512_generic cifs l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel xt_recent xt_comment ipt_REJECT nf_reject_ipv4 xt_mark iptable_mangle xt_TCPMSS xt_CT iptable_raw xt_multiport xt_NFLOG nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp asn1_decoder nf_nat_sip nf_nat_pptp nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda ts_kmp nf_conntrack_amanda nf_conntrack_sane nf_conntrack_tftp nf_conntrack_sip nf_conntrack_pptp nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp nfsd auth_rpcgss oid_registry nfs_acl xt_nat veth xt_conntrack xt_MASQUERADE nf_conntrack_netlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat ip_tables binfmt_misc hwmon_vid nouveau intel_powerclamp coretemp kvm_intel kvm i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt irqbypass fb_sys_fops pcspkr drm drm_panel_orientation_quirks i2c_i801 nvidiafb cfbfillrect cfbimgblt lpc_ich vgastate mfd_core e1000 e1000e
[69349.812285] r8169 cfbcopyarea realtek wmi libphy xts cbc overlay loop fuse nfs lockd grace sunrpc linear raid10 raid1 raid0 dm_thin_pool dm_snapshot dm_raid raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx md_mod dm_mirror dm_region_hash dm_log dm_cache_smq dm_cache dm_persistent_data dm_bufio dm_bio_prison hid_sunplus hid_samsung hid_pl hid_petalynx hid_gyration usbhid ohci_hcd uhci_hcd usb_storage xhci_plat_hcd xhci_pci xhci_hcd ehci_pci ehci_hcd pata_jmicron pata_amd pata_mpiix hpsa mptsas mpt3sas scsi_transport_sas mptspi scsi_transport_spi mptscsih mptbase sata_inic162x sata_nv sata_sil24 ata_piix ahci libahci nvme nvme_core
[69349.812319] CPU: 3 PID: 6405 Comm: btrfs Tainted: G W 5.6.3-gentoo-x86_64 #2
[69349.812321] Hardware name: Dell Inc. Precision T3610/, BIOS A03 09/05/2013
[69349.812325] RIP: 0010:refcount_warn_saturate+0xa6/0xf0
[69349.812327] Code: 05 1c e4 a8 00 01 e8 17 5c cb ff 0f 0b c3 80 3d 0a e4 a8 00 00 75 95 48 c7 c7 a0 78 d6 81 c6 05 fa e3 a8 00 01 e8 f8 5b cb ff <0f> 0b c3 80 3d e9 e3 a8 00 00 0f 85 72 ff ff ff 48 c7 c7 f8 78 d6
[69349.812329] RSP: 0018:ffffc9000149fd30 EFLAGS: 00010286
[69349.812331] RAX: 0000000000000000 RBX: ffff88854ef1cc00 RCX: 0000000000000007
[69349.812333] RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff88884fd980b0
[69349.812334] RBP: ffff88854ef1cda0 R08: 000000000000231c R09: 0000000000000001
[69349.812336] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8888485b5e00
[69349.812337] R13: ffff8888485b5e00 R14: ffff88854ef1cc00 R15: ffff8888485b5e78
[69349.812340] FS: 00007fe0e36678c0(0000) GS:ffff88884fd80000(0000) knlGS:0000000000000000
[69349.812342] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[69349.812343] CR2: 00007fcd3a19e6b8 CR3: 00000001265a6001 CR4: 00000000000606a0
[69349.812344] Call Trace:
[69349.812348] btrfs_sysfs_rm_device_link+0x4e/0xe0
[69349.812353] btrfs_rm_device.cold+0x6d/0x12b
[69349.812355] btrfs_ioctl+0x2a08/0x2dc0
[69349.812358] ? kmem_cache_alloc+0xa0/0x100
[69349.812362] ? _copy_to_user+0x28/0x30
[69349.812364] ? cp_new_stat+0x14b/0x180
[69349.812367] ? __do_sys_newstat+0x48/0x70
[69349.812370] ? ksys_ioctl+0x69/0xa0
[69349.812372] ksys_ioctl+0x69/0xa0
[69349.812375] __x64_sys_ioctl+0x11/0x20
[69349.812377] do_syscall_64+0x43/0x120
[69349.812380] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[69349.812382] RIP: 0033:0x7fe0e3764c57
[69349.812384] Code: 00 00 00 75 0c 48 c7 c0 ff ff ff ff 48 83 c4 18 c3 e8 7d d0 01 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 09 d2 0c 00 f7 d8 64 89 01 48
[69349.812386] RSP: 002b:00007ffd661c0e58 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[69349.812388] RAX: ffffffffffffffda RBX: 00007ffd661c3010 RCX: 00007fe0e3764c57
[69349.812390] RDX: 00007ffd661c1e80 RSI: 000000005000943a RDI: 0000000000000003
[69349.812391] RBP: 0000000000000000 R08: 00007ffd661c1eb8 R09: 0000000000000231
[69349.812393] R10: 000055da8079e81b R11: 0000000000000202 R12: 0000000000000000
[69349.812395] R13: 000055da80841680 R14: 00007ffd661c1e80 R15: 0000000000000003
[69349.812397] ---[ end trace 8fa4b24e88c5878c ]---
[69349.886478] BTRFS info (device sdc1): device deleted: /dev/sdj1
[69385.855290] BTRFS info (device sdc1): dev_replace from /dev/sdk1 (devid 6) to /dev/sdj1 started
