This is with kernel 5.0.7, still ro mounted with blockdev --setro as well
[root@localhost-live ~]# btrfs scrub start -BrR /mnt
scrub done for 72df6d5b-26d1-47ff-a9ab-33f6a0b2c4cf
scrub started at Mon Jun 24 17:59:57 2019 and finished after 00:00:15
data_extents_scrubbed: 231002
tree_extents_scrubbed: 3657
data_bytes_scrubbed: 7518072832
tree_bytes_scrubbed: 239665152
read_errors: 0
csum_errors: 0
verify_errors: 0
no_csum: 25134
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 0
unverified_errors: 0
corrected_errors: 0
last_physical: 93437558784
[root@localhost-live ~]#
I'm not sure what's no_csum on this file system, are those in bytes?
The only file I can think of that's nocow is a qcow2 I made with
nocow=true (chattr +C) option.
-rw-r--r--. 1 root root 194K Jun 16 20:48 untitled.qcow2
At the same time as this scrub, the kernel complained:
[ 5255.219838] BTRFS info (device sda6): using free space tree
[ 5255.219903] BTRFS info (device sda6): has skinny extents
[ 5255.236065] BTRFS info (device sda6): enabling ssd optimizations
[ 5396.839752] BTRFS warning (device sda6): Skipping commit of aborted
transaction.
[ 5396.839853] ------------[ cut here ]------------
[ 5396.839910] BTRFS: Transaction aborted (error -28)
[ 5396.840081] WARNING: CPU: 0 PID: 4583 at
fs/btrfs/transaction.c:1831 cleanup_transaction+0x5d/0xa0 [btrfs]
[ 5396.840190] Modules linked in: devlink rfcomm fuse
nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter
ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ip6table_nat
nf_nat_ipv6 ip6table_mangle ip6table_raw ip6table_security iptable_nat
nf_nat_ipv4 nf_nat iptable_mangle iptable_raw iptable_security
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nfnetlink
ebtable_filter ebtables ip6table_filter ip6_tables bnep rpcrdma
ib_isert iscsi_target_mod ib_iser ib_srpt target_core_mod ib_srp
scsi_transport_srp ib_ipoib rdma_ucm ib_uverbs ib_umad iw_cxgb4
rdma_cm iw_cm ib_cm iw_cxgb3 ib_core snd_hda_codec_cirrus
snd_hda_codec_generic ledtrig_audio b43 cordic uvcvideo mac80211
videobuf2_vmalloc i915 btusb videobuf2_memops videobuf2_v4l2 btrtl
videobuf2_common btbcm btintel intel_rapl videodev bluetooth
snd_hda_codec_hdmi kvmgt cfg80211 x86_pkg_temp_thermal snd_hda_intel
intel_powerclamp media vfio_mdev snd_hda_codec mdev coretemp
vfio_iommu_type1 kvm_intel snd_hda_core ecdh_generic
[ 5396.840256] ssb vfio bcm5974 snd_hwdep kvm rfkill snd_seq joydev
snd_seq_device ttm snd_pcm i2c_algo_bit irqbypass drm_kms_helper
intel_cstate snd_timer drm bcma snd intel_uncore iTCO_wdt mei_me
acpi_als iTCO_vendor_support soundcore mei intel_rapl_perf kfifo_buf
applesmc apple_gmux lpc_ich industrialio i2c_i801 input_polldev
pcc_cpufreq sbs sbshc apple_bl nls_utf8 isofs squashfs dm_multipath
btrfs xor zstd_compress raid6_pq crct10dif_pclmul 8021q libcrc32c
crc32_pclmul garp crc32c_intel zstd_decompress sdhci_pci mrp stp llc
cqhci sdhci ghash_clmulni_intel firewire_ohci tg3 mmc_core thunderbolt
firewire_core crc_itu_t video uas usb_storage hid_apple hid_appleir
sunrpc be2iscsi bnx2i cnic uio cxgb4i cxgb4 cxgb3i cxgb3 mdio libcxgbi
libcxgb qla4xxx iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi
scsi_transport_iscsi loop
[ 5396.841981] CPU: 0 PID: 4583 Comm: btrfs-transacti Not tainted
5.0.7-300.fc30.x86_64 #1
[ 5396.842069] Hardware name: Apple Inc.
MacBookPro8,2/Mac-94245A3940C91C80, BIOS
MBP81.88Z.0050.B00.1804101331 04/10/18
[ 5396.842241] RIP: 0010:cleanup_transaction+0x5d/0xa0 [btrfs]
[ 5396.842308] Code: 83 f8 01 77 63 f0 49 0f ba ad 38 23 00 00 02 72
1b 41 83 fc fb 0f 84 97 8d 08 00 44 89 e6 48 c7 c7 58 72 5c c0 e8 d2
37 bb f7 <0f> 0b 44 89 e1 ba 27 07 00 00 4d 8d 66 28 48 89 ef 48 c7 c6
90 ae
[ 5396.842507] RSP: 0018:ffffb81a81c8fde8 EFLAGS: 00010282
[ 5396.842569] RAX: 0000000000000000 RBX: ffff8d2be70ecc20 RCX: ffff8d2c678168c0
[ 5396.842649] RDX: 0000000000000007 RSI: 0000000000000006 RDI: ffff8d2c678168c0
[ 5396.842729] RBP: ffff8d2be70ecbc8 R08: 0000000000000001 R09: 00000000000004a6
[ 5396.842812] R10: 000000000001a804 R11: 0000000000000007 R12: 00000000ffffffe4
[ 5396.842891] R13: ffff8d2b97488000 R14: ffff8d2c56db7200 R15: ffff8d2be70ecb00
[ 5396.842972] FS: 0000000000000000(0000) GS:ffff8d2c67800000(0000)
knlGS:0000000000000000
[ 5396.848211] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5396.853447] CR2: 00007fea0109510c CR3: 00000001bb20e001 CR4: 00000000000606f0
[ 5396.858717] Call Trace:
[ 5396.864015] btrfs_commit_transaction+0x83f/0x930 [btrfs]
[ 5396.869353] ? start_transaction+0x9b/0x470 [btrfs]
[ 5396.874657] ? __next_timer_interrupt+0x70/0xd0
[ 5396.879998] transaction_kthread+0x144/0x180 [btrfs]
[ 5396.885310] kthread+0xfb/0x130
[ 5396.890599] ? btrfs_cleanup_transaction+0x540/0x540 [btrfs]
[ 5396.895841] ? kthread_park+0x90/0x90
[ 5396.901059] ret_from_fork+0x35/0x40
[ 5396.906268] ---[ end trace c42b154d80664636 ]---
[ 5396.911560] BTRFS warning (device sda6): cleanup_transaction:1831:
Aborting unused transaction(No space left).
[ 5396.913679] BTRFS info (device sda6): delayed_refs has NO entry
[root@localhost-live ~]#
I don't know. There's no log tree and no transactions have happened,
so I don't know what transaction it wants to clean up.
Chris Murphy
