In data giovedì 9 agosto 2018 20:48:03 CEST, Jeff Mahoney ha scritto:
> On 8/9/18 11:15 AM, Giuseppe Della Bianca wrote:
> > Hi.
> >
> > My system:
> > - Fedora 28 x86_64
> > - kernel-4.17.7-200
> > - btrfs-progs-4.15.1-1
> >
> > The command 'btrfs subvolume sync -s 2 xyz' hangs in this case:
> >
> > - Run command 'btrfs subvolume sync -s 2 xyz' .
> > - After some time the kernel reports an error on the filesystem.
> >
> > (error that existed before the command was launched.)
> >
> > - The filesystem goes in read-only mode.
> > - The command hangs.
>
> Can you provide the output of 'dmesg' and the contents of
> /proc//stack where is the pid of the btrfs command process?
>
> -Jeff
For pid info we have to wait for the problem to reoccur.
(the filesystem has been restored.)
Kernel messages
Aug 7 15:45:33 exnet kernel: WARNING: CPU: 2 PID: 9700 at fs/btrfs/extent-
tree.c:7001 __btrfs_free_extent.isra.70+0x782/0xb10 [btrfs]
Aug 7 15:45:33 exnet kernel: Modules linked in: ppp_deflate bsd_comp
ppp_async ppp_generic slhc cdc_ether usbnet option mii usb_wwan uas
usb_storage fuse tun bridge devlink ebtable_filter ebtables bnx2fc cnic uio
8021q fcoe libfcoe garp mrp stp llc libfc scsi_transport_fc nf_log_ipv4
nf_log_common xt_LOG xt_limit xt_multiport xt_CHECKSUM iptable_mangle
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4
nf_defrag_ipv4 nf_nat_ipv4 nf_nat ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6
nf_defrag_ipv6 xt_conntrack nf_conntrack uinput ip6table_filter ip6_tables
eeepc_wmi asus_wmi sparse_keymap iTCO_wdt iTCO_vendor_support rfkill ppdev
snd_hda_codec_hdmi wmi_bmof mxm_wmi snd_usb_audio snd_hda_codec_realtek
snd_usbmidi_lib snd_hda_codec_generic snd_rawmidi intel_rapl
x86_pkg_temp_thermal intel_powerclamp coretemp
Aug 7 15:45:33 exnet kernel: snd_hda_intel kvm_intel kvm snd_hda_codec
snd_hda_core snd_hwdep snd_seq snd_seq_device irqbypass crct10dif_pclmul
crc32_pclmul snd_pcm ghash_clmulni_intel intel_cstate intel_uncore
intel_rapl_perf snd_timer snd mei_me soundcore i2c_i801 mei shpchp parport_pc
parport wmi acpi_pad vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) binfmt_misc
vboxdrv(OE) btrfs libcrc32c xor zstd_decompress zstd_compress xxhash raid6_pq
i915 i2c_algo_bit drm_kms_helper e1000e nvme drm crc32c_intel serio_raw
nvme_core video analog gameport joydev i2c_dev
Aug 7 15:45:33 exnet kernel: CPU: 2 PID: 9700 Comm: btrfs-cleaner Tainted: G
OE 4.17.7-200.fc28.x86_64 #1
Aug 7 15:45:33 exnet kernel: Hardware name: System manufacturer System
Product Name/Z170M-PLUS, BIOS 0704 02/18/2016
Aug 7 15:45:33 exnet kernel: RIP: 0010:__btrfs_free_extent.isra.
70+0x782/0xb10 [btrfs]
Aug 7 15:45:33 exnet kernel: RSP: 0018:af1c4992bc30 EFLAGS: 00010246
Aug 7 15:45:33 exnet kernel: RAX: fffe RBX: 8fe421682230 RCX:
Aug 7 15:45:33 exnet kernel: RDX: RSI: RDI:
8fe428f7b068
Aug 7 15:45:33 exnet kernel: RBP: 000e401ec000 R08: af1c4992bba4 R09:
0046
Aug 7 15:45:33 exnet kernel: R10: 02ef R11: R12:
8fe43cd5
Aug 7 15:45:33 exnet kernel: R13: fffe R14: R15:
0578
Aug 7 15:45:33 exnet kernel: FS: ()
GS:8fe5bbd0() knlGS:
Aug 7 15:45:33 exnet kernel: CS: 0010 DS: ES: CR0:
80050033
Aug 7 15:45:33 exnet kernel: CR2: 564e5fb75650 CR3: 00028f20a004 CR4:
003606e0
Aug 7 15:45:33 exnet kernel: DR0: DR1: DR2:
Aug 7 15:45:33 exnet kernel: DR3: DR6: fffe0ff0 DR7:
0400
Aug 7 15:45:33 exnet kernel: Call Trace:
Aug 7 15:45:33 exnet kernel: __btrfs_run_delayed_refs+0x216/0x10b0 [btrfs]
Aug 7 15:45:33 exnet kernel: ? btrfs_set_disk_extent_flags+0x72/0xb0 [btrfs]
Aug 7 15:45:33 exnet kernel: btrfs_run_delayed_refs+0x78/0x180 [btrfs]
Aug 7 15:45:33 exnet kernel: btrfs_should_end_transaction+0x3e/0x60 [btrfs]
Aug 7 15:45:33 exnet kernel: btrfs_drop_snapshot+0x3cf/0x820 [btrfs]
Aug 7 15:45:33 exnet kernel: ? btree_submit_bio_start+0x20/0x20 [btrfs]
Aug 7 15:45:33 exnet kernel: btrfs_clean_one_deleted_snapshot+0xba/0xe0
[btrfs]
Aug 7 15:45:33 exnet kernel: cleaner_kthread+0x129/0x160 [btrfs]
Aug 7 15:45:33 exnet kernel: kthread+0x112/0x130
Aug 7 15:45:33 exnet kernel: ? kthread_create_worker_on_cpu+0x70/0x70
Aug 7 15:45:33 exnet kernel: ret_from_fork+0x35/0x40
Aug 7 15:45:33 exnet kernel: Code: b8 00 00 00 48 8b 7c 24 18 e8 bb b7 ff ff
41 89 c5 58 5a c6 44 24 24 00 45 85 ed 0f 84 97 f9 ff ff 41 83 fd fe 0f 85 63
fc ff ff <0f> 0b 48 8b 3b e8 94 ca 00 00 4d 89 f8 4c 89 f1 48 89 ea ff b4
Aug 7 15:45:33 exnet kernel: ---[ end trace 961b1007d36aa769 ]---
Aug 7 15:45:33 exnet kernel: BTRFS info (device sda3): leaf 6329344 gen
1601 total ptrs 135 free space 5456 owner 2
Aug 7 15:45:33 exnet kernel:
