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/<pid>/stack where <pid> 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:ffffaf1c4992bc30 EFLAGS: 00010246 Aug 7 15:45:33 exnet kernel: RAX: 00000000fffffffe RBX: ffff8fe421682230 RCX: 0000000000000000 Aug 7 15:45:33 exnet kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8fe428f7b068 Aug 7 15:45:33 exnet kernel: RBP: 0000000e401ec000 R08: ffffaf1c4992bba4 R09: 0000000000000046 Aug 7 15:45:33 exnet kernel: R10: 00000000000002ef R11: 0000000000000000 R12: ffff8fe43cd50000 Aug 7 15:45:33 exnet kernel: R13: 00000000fffffffe R14: 0000000000000000 R15: 0000000000000578 Aug 7 15:45:33 exnet kernel: FS: 0000000000000000(0000) GS:ffff8fe5bbd00000(0000) knlGS:0000000000000000 Aug 7 15:45:33 exnet kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Aug 7 15:45:33 exnet kernel: CR2: 0000564e5fb75650 CR3: 000000028f20a004 CR4: 00000000003606e0 Aug 7 15:45:33 exnet kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Aug 7 15:45:33 exnet kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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 88886329344 gen 1601 total ptrs 135 free space 5456 owner 2 Aug 7 15:45:33 exnet kernel: #011item 0 key (61204873216 169 0) itemoff 16142 itemsize 141 Aug 7 15:45:33 exnet kernel: #011#011extent refs 13 gen 1476 flags 258 Aug 7 15:45:33 exnet kernel: #011#011ref#0: tree block backref root 1407 Aug 7 15:45:33 exnet kernel: #011#011ref#1: tree block backref root 1405 Aug 7 15:45:33 exnet kernel: #011#011ref#2: tree block backref root 1403 Aug 7 15:45:33 exnet kernel: #011#011ref#3: shared block backref parent 88626577408 Aug 7 15:45:33 exnet kernel: #011#011ref#4: shared block backref parent 88508121088 Aug 7 15:45:33 exnet kernel: #011#011ref#5: shared block backref parent 88417042432 Aug 7 15:45:33 exnet kernel: #011#011ref#6: shared block backref parent 88244256768 Aug 7 15:45:33 exnet kernel: #011#011ref#7: shared block backref parent 88084234240 Aug 7 15:45:33 exnet kernel: #011#011ref#8: shared block backref parent 80272637952 ................................................................ ................................................................ ................................................................ Aug 7 15:45:33 exnet kernel: #011#011extent refs 1 gen 1476 flags 258 Aug 7 15:45:33 exnet kernel: #011#011ref#0: shared block backref parent 61205299200 Aug 7 15:45:33 exnet kernel: #011item 134 key (61207068672 169 0) itemoff 8831 itemsize 33 Aug 7 15:45:33 exnet kernel: #011#011extent refs 1 gen 1476 flags 258 Aug 7 15:45:33 exnet kernel: #011#011ref#0: shared block backref parent 61205299200 Aug 7 15:45:33 exnet kernel: BTRFS error (device sda3): unable to find ref byte nr 61205299200 parent 0 root 1400 owner 1 offset 0 Aug 7 15:45:33 exnet kernel: ------------[ cut here ]------------ Aug 7 15:45:33 exnet kernel: WARNING: CPU: 2 PID: 9700 at fs/btrfs/extent- tree.c:7007 __btrfs_free_extent.isra.70+0x7e2/0xb10 [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 W 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+0x7e2/0xb10 [btrfs] Aug 7 15:45:33 exnet kernel: RSP: 0018:ffffaf1c4992bc30 EFLAGS: 00010286 Aug 7 15:45:33 exnet kernel: RAX: 0000000000000000 RBX: ffff8fe421682230 RCX: 0000000000000006 Aug 7 15:45:33 exnet kernel: RDX: 0000000000000007 RSI: 0000000000000086 RDI: ffff8fe5bbd16930 Aug 7 15:45:33 exnet kernel: RBP: 0000000e401ec000 R08: 0000000000000038 R09: 00000000000006d1 Aug 7 15:45:33 exnet kernel: R10: 0000000000000000 R11: 0000000000000001 R12: ffff8fe43cd50000 Aug 7 15:45:33 exnet kernel: R13: 00000000fffffffe R14: 0000000000000000 R15: 0000000000000578 Aug 7 15:45:33 exnet kernel: FS: 0000000000000000(0000) GS:ffff8fe5bbd00000(0000) knlGS:0000000000000000 Aug 7 15:45:33 exnet kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Aug 7 15:45:33 exnet kernel: CR2: 0000564e5fb75650 CR3: 000000028f20a004 CR4: 00000000003606e0 Aug 7 15:45:33 exnet kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Aug 7 15:45:33 exnet kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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: 10 48 8b 40 50 f0 48 0f ba a8 30 23 00 00 02 0f 92 c0 41 59 84 c0 0f 85 6c a9 09 00 44 89 ee 48 c7 c7 e8 2e 7c c0 e8 68 9a 99 ed <0f> 0b e9 56 a9 09 00 48 89 df e8 bf 0c ff ff 49 8b 74 24 28 4d Aug 7 15:45:33 exnet kernel: ---[ end trace 961b1007d36aa76a ]--- Aug 7 15:45:33 exnet kernel: BTRFS: error (device sda3) in __btrfs_free_extent:7007: errno=-2 No such entry Aug 7 15:45:33 exnet kernel: BTRFS info (device sda3): forced readonly Aug 7 15:45:33 exnet kernel: BTRFS: error (device sda3) in btrfs_run_delayed_refs:3076: errno=-2 No such entry gdb
