After the latest Tumbleweed update the btrfs balance script ran into trouble.
It finished without error after a reboot, but today btrfs switched the file
system read-only again.
[ 550.910590] ------------[ cut here ]------------
[ 550.910644] WARNING: CPU: 2 PID: 524 at ../fs/btrfs/extent-tree.c:6945
__btrfs_free_extent.isra.70+0x7f8/0xcc0 [btrfs]
[ 550.910646] Modules linked in: fuse ip6t_REJECT nf_reject_ipv6 nf_log_ipv6
nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT nf_reject_ipv4
xt_tcpudp xt_pkttype xt_physdev br_netfilter nf_log_ipv4 nf_log_common xt_LOG
xt_limit iptable_raw xt_CT iptable_filter ip6table_mangle
nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4
ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables
af_packet bridge stp llc iscsi_ibft iscsi_boot_sysfs msr nls_iso8859_1
nls_cp437 vfat xfs libcrc32c fat snd_hda_codec_realtek snd_hda_codec_generic
intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp snd_emu10k1
snd_util_mem snd_rawmidi kvm_intel kvm snd_seq_device snd_ac97_codec irqbypass
crct10dif_pclmul crc32_pclmul snd_hda_intel ghash_clmulni_intel snd_hda_codec
[ 550.910718] aesni_intel snd_hda_core snd_hwdep pl2303 snd_pcm usbserial
aes_x86_64 mei_wdt lrw iTCO_wdt i2c_i801 glue_helper iTCO_vendor_support dcdbas
emu10k1_gp ablk_helper cryptd i2c_smbus pcspkr gameport ac97_bus snd_timer
battery snd thermal ie31200_edac e1000e fjes tpm_tis soundcore mei_me lpc_ich
tpm_tis_core ptp mei tpm pps_core edac_core shpchp mfd_core btrfs xor
zlib_deflate raid6_pq crc32c_intel serio_raw sr_mod cdrom ehci_pci ehci_hcd
i915 i2c_algo_bit drm_kms_helper syscopyarea xhci_pci sysfillrect sysimgblt
fb_sys_fops xhci_hcd usbcore drm usb_common button video dm_mirror
dm_region_hash dm_log sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc
scsi_dh_alua efivarfs
[ 550.910805] CPU: 2 PID: 524 Comm: btrfs-transacti Not tainted
4.8.6-2-default #1
[ 550.910807] Hardware name: Dell Inc. PowerEdge T20/0VD5HY, BIOS A06
01/27/2015
[ 550.910810] 0000000000000000 ffffffff833a4272 0000000000000000
0000000000000000
[ 550.910817] ffffffff8307de2e 000000948ea83000 00000000fffffffe
ffff8b124d565640
[ 550.910822] ffff8b1312be2000 0000000000000000 ffff8b12893d9ee0
ffffffffc072d628
[ 550.910828] Call Trace:
[ 550.910853] [<ffffffff8302eefe>] dump_trace+0x5e/0x310
[ 550.910863] [<ffffffff8302f2cb>] show_stack_log_lvl+0x11b/0x1a0
[ 550.910871] [<ffffffff83030001>] show_stack+0x21/0x40
[ 550.910880] [<ffffffff833a4272>] dump_stack+0x5c/0x7a
[ 550.910889] [<ffffffff8307de2e>] __warn+0xbe/0xe0
[ 550.910927] [<ffffffffc072d628>] __btrfs_free_extent.isra.70+0x7f8/0xcc0
[btrfs]
[ 550.910970] [<ffffffffc073173f>] __btrfs_run_delayed_refs+0x56f/0x12f0
[btrfs]
[ 550.911006] [<ffffffffc073544a>] btrfs_run_delayed_refs+0x9a/0x2a0 [btrfs]
[ 550.911047] [<ffffffffc074b3b0>] btrfs_commit_transaction+0x40/0xa80
[btrfs]
[ 550.911087] [<ffffffffc07462c2>] transaction_kthread+0x1c2/0x1f0 [btrfs]
[ 550.911097] [<ffffffff8309c5ed>] kthread+0xbd/0xe0
[ 550.911106] [<ffffffff836d461f>] ret_from_fork+0x1f/0x40
[ 550.915472] DWARF2 unwinder stuck at ret_from_fork+0x1f/0x40
[ 550.915475] Leftover inexact backtrace:
[ 550.915481] [<ffffffff8309c530>] ? kthread_worker_fn+0x170/0x170
[ 550.915513] ---[ end trace 3a5d969e50f23ff9 ]---
[ 550.915519] BTRFS info (device dm-0): leaf 141427425280 total ptrs 147 free
space 6695
[ 550.915523] item 0 key (638039019520 168 8192) itemoff 16246 itemsize 37
[ 550.915526] extent refs 1 gen 381569 flags 1
[ 550.915529] shared data backref parent 142174797824 count 1
[ 550.915532] item 1 key (638039027712 168 8192) itemoff 16209 itemsize 37
[ 550.915534] extent refs 1 gen 381569 flags 1
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[ 550.916042] extent refs 4 gen 381569 flags 1
[ 550.916043] shared data backref parent 141960380416 count 1
[ 550.916045] shared data backref parent 141960364032 count 1
[ 550.916046] shared data backref parent 141960347648 count 1
[ 550.916048] shared data backref parent 141960331264 count 1
[ 550.916050] item 89 key (638053994496 168 16384) itemoff 12479 itemsize 76
[ 550.916052] extent refs 4 gen 381569 flags 1
[ 550.916053] shared data backref parent 141960380416 count 1
[ 550.916054] shared data backref parent 141960364032 count 1
[ 550.916056] shared data backref parent 141960347648 count 1
[ 550.916057] shared data backref parent 141960331264 count 1
[ 550.916060] item 90 key (638054010880 168 4096) itemoff 12442 itemsize 37
[ 550.916061] extent refs 1 gen 381569 flags 1
[ 550.916063] shared data backref parent 141960396800 count 1
[ 550.916065] item 91 key (638054014976 168 12288) itemoff 12405 itemsize 37
[ 550.916066] extent refs 1 gen 381569 flags 1
[ 550.916068] shared data backref parent 141960396800 count 1
[ 550.916070] item 92 key (638054027264 168 8192) itemoff 12368 itemsize 37
[ 550.916071] extent refs 1 gen 381569 flags 1
[ 550.916073] shared data backref parent 141960396800 count 1
[ 550.916075] item 93 key (638054035456 168 12288) itemoff 12331 itemsize 37
[ 550.916077] extent refs 1 gen 381569 flags 1
[ 550.916078] shared data backref parent 141960396800 count 1
[ 550.916080] item 94 key (638054047744 168 8192) itemoff 12294 itemsize 37
[ 550.916082] extent refs 1 gen 381569 flags 1
[ 550.916083] shared data backref parent 141960396800 count 1
[ 550.916085] item 95 key (638054055936 168 24576) itemoff 12257 itemsize 37
[ 550.916087] extent refs 1 gen 381569 flags 1
[ 550.916088] shared data backref parent 141960396800 count 1
[ 550.916090] item 96 key (638054080512 168 8192) itemoff 12220 itemsize 37
[ 550.916092] extent refs 1 gen 381569 flags 1
[ 550.916094] shared data backref parent 141960396800 count 1
[ 550.916096] item 97 key (638054088704 168 12288) itemoff 12183 itemsize 37
[ 550.916098] extent refs 1 gen 381569 flags 1
[ 550.916099] shared data backref parent 141960396800 count 1
[ 550.916101] item 98 key (638054100992 168 12288) itemoff 12146 itemsize 37
[ 550.916103] extent refs 1 gen 381569 flags 1
[ 550.916104] shared data backref parent 141960396800 count 1
[ 550.916106] item 99 key (638054113280 168 36864) itemoff 12109 itemsize 37
[ 550.916108] extent refs 1 gen 381569 flags 1
[ 550.916109] shared data backref parent 141960396800 count 1
[ 550.916112] item 100 key (638054150144 168 24576) itemoff 12072 itemsize 37
[ 550.916113] extent refs 1 gen 381569 flags 1
[ 550.916115] shared data backref parent 141960396800 count 1
[ 550.916117] item 101 key (638054174720 168 8192) itemoff 12035 itemsize 37
[ 550.916118] extent refs 1 gen 381569 flags 1
[ 550.916120] shared data backref parent 141960396800 count 1
[ 550.916122] item 102 key (638054182912 168 8192) itemoff 11998 itemsize 37
[ 550.916124] extent refs 1 gen 381569 flags 1
[ 550.916125] shared data backref parent 141960396800 count 1
[ 550.916127] item 103 key (638054191104 168 4096) itemoff 11961 itemsize 37
[ 550.916129] extent refs 1 gen 381569 flags 1
[ 550.916130] shared data backref parent 141960396800 count 1
[ 550.916132] item 104 key (638054195200 168 176128) itemoff 11924 itemsize
37
[ 550.916134] extent refs 1 gen 381569 flags 1
[ 550.916135] shared data backref parent 141960413184 count 1
[ 550.916138] item 105 key (638054371328 168 49152) itemoff 11887 itemsize 37
[ 550.916139] extent refs 1 gen 381569 flags 1
[ 550.916141] shared data backref parent 141960396800 count 1
[ 550.916143] item 106 key (638054420480 168 12288) itemoff 11850 itemsize 37
[ 550.916144] extent refs 1 gen 381569 flags 1
[ 550.916146] shared data backref parent 141960396800 count 1
[ 550.916148] item 107 key (638054432768 168 8192) itemoff 11813 itemsize 37
[ 550.916149] extent refs 1 gen 381569 flags 1
[ 550.916151] shared data backref parent 141960396800 count 1
[ 550.916153] item 108 key (638054440960 168 8192) itemoff 11776 itemsize 37
[ 550.916154] extent refs 1 gen 381569 flags 1
[ 550.916156] shared data backref parent 141960396800 count 1
[ 550.916158] item 109 key (638054449152 168 4096) itemoff 11739 itemsize 37
[ 550.916159] extent refs 1 gen 381569 flags 1
[ 550.916161] shared data backref parent 141960396800 count 1
[ 550.916163] item 110 key (638054453248 168 4096) itemoff 11702 itemsize 37
[ 550.916165] extent refs 1 gen 381569 flags 1
[ 550.916166] shared data backref parent 141960396800 count 1
[ 550.916168] item 111 key (638054457344 168 4096) itemoff 11665 itemsize 37
[ 550.916170] extent refs 1 gen 381569 flags 1
[ 550.916171] shared data backref parent 141960445952 count 1
[ 550.916173] item 112 key (638054461440 168 61440) itemoff 11628 itemsize 37
[ 550.916175] extent refs 1 gen 381569 flags 1
[ 550.916176] shared data backref parent 142150303744 count 1
[ 550.916178] item 113 key (638054522880 168 98304) itemoff 11591 itemsize 37
[ 550.916180] extent refs 1 gen 381569 flags 1
[ 550.916181] shared data backref parent 141960396800 count 1
[ 550.916184] item 114 key (638054621184 168 8192) itemoff 11554 itemsize 37
[ 550.916185] extent refs 1 gen 381569 flags 1
[ 550.916186] shared data backref parent 141960445952 count 1
[ 550.916189] item 115 key (638054629376 168 12288) itemoff 11517 itemsize 37
[ 550.916190] extent refs 1 gen 381569 flags 1
[ 550.916192] shared data backref parent 141960445952 count 1
[ 550.916194] item 116 key (638054641664 168 4096) itemoff 11480 itemsize 37
[ 550.916195] extent refs 1 gen 381569 flags 1
[ 550.916197] shared data backref parent 141960445952 count 1
[ 550.916199] item 117 key (638054645760 168 4096) itemoff 11443 itemsize 37
[ 550.916200] extent refs 1 gen 381569 flags 1
[ 550.916202] shared data backref parent 141960445952 count 1
[ 550.916204] item 118 key (638054649856 168 12288) itemoff 11406 itemsize 37
[ 550.916205] extent refs 1 gen 381569 flags 1
[ 550.916207] shared data backref parent 141960445952 count 1
[ 550.916209] item 119 key (638054662144 168 4096) itemoff 11369 itemsize 37
[ 550.916210] extent refs 1 gen 381569 flags 1
[ 550.916212] shared data backref parent 141960445952 count 1
[ 550.916214] item 120 key (638054666240 168 4096) itemoff 11332 itemsize 37
[ 550.916216] extent refs 1 gen 381569 flags 1
[ 550.916217] shared data backref parent 141960445952 count 1
[ 550.916219] item 121 key (638054670336 168 16384) itemoff 11295 itemsize 37
[ 550.916221] extent refs 1 gen 381569 flags 1
[ 550.916222] shared data backref parent 141960445952 count 1
[ 550.916224] item 122 key (638054686720 168 16384) itemoff 11258 itemsize 37
[ 550.916226] extent refs 1 gen 381569 flags 1
[ 550.916227] shared data backref parent 141960445952 count 1
[ 550.916229] item 123 key (638054703104 168 4096) itemoff 11221 itemsize 37
[ 550.916231] extent refs 1 gen 381569 flags 1
[ 550.916232] shared data backref parent 141960445952 count 1
[ 550.916234] item 124 key (638054707200 168 4096) itemoff 11184 itemsize 37
[ 550.916236] extent refs 1 gen 381569 flags 1
[ 550.916237] shared data backref parent 141960445952 count 1
[ 550.916240] item 125 key (638054711296 168 40960) itemoff 11147 itemsize 37
[ 550.916241] extent refs 1 gen 381569 flags 1
[ 550.916243] shared data backref parent 141960445952 count 1
[ 550.916245] item 126 key (638054752256 168 28672) itemoff 11110 itemsize 37
[ 550.916246] extent refs 1 gen 381569 flags 1
[ 550.916248] shared data backref parent 141960445952 count 1
[ 550.916250] item 127 key (638054780928 168 40960) itemoff 11073 itemsize 37
[ 550.916251] extent refs 1 gen 381569 flags 1
[ 550.916253] shared data backref parent 141960445952 count 1
[ 550.916255] item 128 key (638054821888 168 16384) itemoff 11036 itemsize 37
[ 550.916256] extent refs 1 gen 381569 flags 1
[ 550.916258] shared data backref parent 141960445952 count 1
[ 550.916260] item 129 key (638054838272 168 16384) itemoff 10999 itemsize 37
[ 550.916262] extent refs 1 gen 381569 flags 1
[ 550.916263] shared data backref parent 141960445952 count 1
[ 550.916265] item 130 key (638054854656 168 28672) itemoff 10962 itemsize 37
[ 550.916267] extent refs 1 gen 381569 flags 1
[ 550.916268] shared data backref parent 141960445952 count 1
[ 550.916270] item 131 key (638054883328 168 57344) itemoff 10925 itemsize 37
[ 550.916272] extent refs 1 gen 381569 flags 1
[ 550.916273] shared data backref parent 141960445952 count 1
[ 550.916275] item 132 key (638054940672 168 8192) itemoff 10888 itemsize 37
[ 550.916277] extent refs 1 gen 381569 flags 1
[ 550.916278] shared data backref parent 141960445952 count 1
[ 550.916280] item 133 key (638054948864 168 8192) itemoff 10851 itemsize 37
[ 550.916282] extent refs 1 gen 381569 flags 1
[ 550.916283] shared data backref parent 141960445952 count 1
[ 550.916285] item 134 key (638054957056 168 4096) itemoff 10814 itemsize 37
[ 550.916287] extent refs 1 gen 381569 flags 1
[ 550.916289] shared data backref parent 141960445952 count 1
[ 550.916291] item 135 key (638054961152 168 4096) itemoff 10777 itemsize 37
[ 550.916292] extent refs 1 gen 381569 flags 1
[ 550.916294] shared data backref parent 141960478720 count 1
[ 550.916296] item 136 key (638054965248 168 8192) itemoff 10740 itemsize 37
[ 550.916297] extent refs 1 gen 381569 flags 1
[ 550.916299] shared data backref parent 141960478720 count 1
[ 550.916301] item 137 key (638054973440 168 8192) itemoff 10703 itemsize 37
[ 550.916302] extent refs 1 gen 381569 flags 1
[ 550.916304] shared data backref parent 141960478720 count 1
[ 550.916306] item 138 key (638054981632 168 16384) itemoff 10666 itemsize 37
[ 550.916308] extent refs 1 gen 381569 flags 1
[ 550.916309] shared data backref parent 141960478720 count 1
[ 550.916311] item 139 key (638054998016 168 12288) itemoff 10629 itemsize 37
[ 550.916313] extent refs 1 gen 381569 flags 1
[ 550.916314] shared data backref parent 141960478720 count 1
[ 550.916316] item 140 key (638055010304 168 4096) itemoff 10592 itemsize 37
[ 550.916318] extent refs 1 gen 381569 flags 1
[ 550.916319] shared data backref parent 141960478720 count 1
[ 550.916321] item 141 key (638055014400 168 4096) itemoff 10555 itemsize 37
[ 550.916323] extent refs 1 gen 381569 flags 1
[ 550.916324] shared data backref parent 141960478720 count 1
[ 550.916326] item 142 key (638055018496 168 73728) itemoff 10518 itemsize 37
[ 550.916328] extent refs 1 gen 381569 flags 1
[ 550.916329] shared data backref parent 141960478720 count 1
[ 550.916332] item 143 key (638055092224 168 16384) itemoff 10481 itemsize 37
[ 550.916333] extent refs 1 gen 381569 flags 1
[ 550.916335] shared data backref parent 141960478720 count 1
[ 550.916337] item 144 key (638055108608 168 8192) itemoff 10444 itemsize 37
[ 550.916338] extent refs 1 gen 381569 flags 1
[ 550.916340] shared data backref parent 141960478720 count 1
[ 550.916342] item 145 key (638055116800 168 8192) itemoff 10407 itemsize 37
[ 550.916343] extent refs 1 gen 381569 flags 1
[ 550.916345] shared data backref parent 141960478720 count 1
[ 550.916347] item 146 key (638055124992 168 12288) itemoff 10370 itemsize 37
[ 550.916348] extent refs 1 gen 381569 flags 1
[ 550.916350] shared data backref parent 141960478720 count 1
[ 550.916354] BTRFS error (device dm-0): unable to find ref byte nr
638048546816 parent 0 root 282 owner 30689 offset 0
[ 550.916360] ------------[ cut here ]------------
[ 550.916391] WARNING: CPU: 2 PID: 524 at ../fs/btrfs/extent-tree.c:6951
__btrfs_free_extent.isra.70+0x9ca/0xcc0 [btrfs]
[ 550.916393] BTRFS: Transaction aborted (error -2)
[ 550.916394] Modules linked in: fuse ip6t_REJECT nf_reject_ipv6 nf_log_ipv6
nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT nf_reject_ipv4
xt_tcpudp xt_pkttype xt_physdev br_netfilter nf_log_ipv4 nf_log_common xt_LOG
xt_limit iptable_raw xt_CT iptable_filter ip6table_mangle
nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4
ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables
af_packet bridge stp llc iscsi_ibft iscsi_boot_sysfs msr nls_iso8859_1
nls_cp437 vfat xfs libcrc32c fat snd_hda_codec_realtek snd_hda_codec_generic
intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp snd_emu10k1
snd_util_mem snd_rawmidi kvm_intel kvm snd_seq_device snd_ac97_codec irqbypass
crct10dif_pclmul crc32_pclmul snd_hda_intel ghash_clmulni_intel snd_hda_codec
[ 550.916452] aesni_intel snd_hda_core snd_hwdep pl2303 snd_pcm usbserial
aes_x86_64 mei_wdt lrw iTCO_wdt i2c_i801 glue_helper iTCO_vendor_support dcdbas
emu10k1_gp ablk_helper cryptd i2c_smbus pcspkr gameport ac97_bus snd_timer
battery snd thermal ie31200_edac e1000e fjes tpm_tis soundcore mei_me lpc_ich
tpm_tis_core ptp mei tpm pps_core edac_core shpchp mfd_core btrfs xor
zlib_deflate raid6_pq crc32c_intel serio_raw sr_mod cdrom ehci_pci ehci_hcd
i915 i2c_algo_bit drm_kms_helper syscopyarea xhci_pci sysfillrect sysimgblt
fb_sys_fops xhci_hcd usbcore drm usb_common button video dm_mirror
dm_region_hash dm_log sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc
scsi_dh_alua efivarfs
[ 550.916521] CPU: 2 PID: 524 Comm: btrfs-transacti Tainted: G W
4.8.6-2-default #1
[ 550.916523] Hardware name: Dell Inc. PowerEdge T20/0VD5HY, BIOS A06
01/27/2015
[ 550.916524] 0000000000000000 ffffffff833a4272 ffff8b1312b3fba8
0000000000000000
[ 550.916529] ffffffff8307de2e 000000948ea83000 ffff8b1312b3fbf8
ffff8b124d565640
[ 550.916535] ffff8b1312be2000 0000000000000000 ffff8b12893d9ee0
ffffffff8307de9f
[ 550.916540] Call Trace:
[ 550.916553] [<ffffffff8302eefe>] dump_trace+0x5e/0x310
[ 550.916561] [<ffffffff8302f2cb>] show_stack_log_lvl+0x11b/0x1a0
[ 550.916569] [<ffffffff83030001>] show_stack+0x21/0x40
[ 550.916576] [<ffffffff833a4272>] dump_stack+0x5c/0x7a
[ 550.916583] [<ffffffff8307de2e>] __warn+0xbe/0xe0
[ 550.916591] [<ffffffff8307de9f>] warn_slowpath_fmt+0x4f/0x60
[ 550.916622] [<ffffffffc072d7fa>] __btrfs_free_extent.isra.70+0x9ca/0xcc0
[btrfs]
[ 550.916657] [<ffffffffc073173f>] __btrfs_run_delayed_refs+0x56f/0x12f0
[btrfs]
[ 550.916692] [<ffffffffc073544a>] btrfs_run_delayed_refs+0x9a/0x2a0 [btrfs]
[ 550.916731] [<ffffffffc074b3b0>] btrfs_commit_transaction+0x40/0xa80
[btrfs]
[ 550.916768] [<ffffffffc07462c2>] transaction_kthread+0x1c2/0x1f0 [btrfs]
[ 550.916776] [<ffffffff8309c5ed>] kthread+0xbd/0xe0
[ 550.916783] [<ffffffff836d461f>] ret_from_fork+0x1f/0x40
[ 550.921086] DWARF2 unwinder stuck at ret_from_fork+0x1f/0x40
[ 550.921088] Leftover inexact backtrace:
[ 550.921092] [<ffffffff8309c530>] ? kthread_worker_fn+0x170/0x170
[ 550.921107] ---[ end trace 3a5d969e50f23ffa ]---
[ 550.921111] BTRFS: error (device dm-0) in __btrfs_free_extent:6951: errno=-2
No such entry
[ 550.921115] BTRFS info (device dm-0): forced readonly
[ 550.921119] BTRFS: error (device dm-0) in btrfs_run_delayed_refs:2960:
errno=-2 No such entry
[ 550.921141] systemd-journald[586]: Failed to truncate file to its own size:
Read-only file system