On Tue, Jan 1, 2019 at 7:07 PM Giuseppe Della Bianca <gius...@gmail.com> wrote: > > 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 > > I had the problem again. > This is the information you asked for: > > root 17133 17127 0 17:17 ? 00:00:00 btrfs subvolume sync -s 2 / > tmp/tmp.p9SiQ1GnpV > > cat /proc/17133/stack > [<0>] hrtimer_nanosleep+0xce/0x1e0 > [<0>] __x64_sys_nanosleep+0x77/0xa0 > [<0>] do_syscall_64+0x5b/0x160 > [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > [<0>] 0xffffffffffffffff > > ............... > [ 1558.053812] CPU: 0 PID: 16871 Comm: btrfs-cleaner Not tainted > 4.17.19-200.fc28.x86_64 #1 > [ 1558.053815] Hardware name: System manufacturer System Product Name/M2N, > BIOS 0902 02/16/2009 > [ 1558.053904] RIP: 0010:__btrfs_free_extent.isra.70+0x782/0xb10 [btrfs] > [ 1558.053907] RSP: 0018:ffffa63985f8fc30 EFLAGS: 00010246 > [ 1558.053912] RAX: 00000000fffffffe RBX: ffff8b71313f8380 RCX: > 0000000000000000 > [ 1558.053914] RDX: 0000000000000000 RSI: 0000000000000000 RDI: > ffff8b711d8ef578 > [ 1558.053916] RBP: 00000011cb804000 R08: ffffa63985f8fba4 R09: > 0000000000000018 > [ 1558.053919] R10: 0000000000000835 R11: 0000000000000000 R12: > ffff8b715f5d4000 > [ 1558.053921] R13: 00000000fffffffe R14: 0000000000000000 R15: > 00000000000005aa > [ 1558.053925] FS: 0000000000000000(0000) GS:ffff8b717fa00000(0000) knlGS: > 0000000000000000 > [ 1558.053928] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 1558.053930] CR2: 00007fdfdffffa08 CR3: 00000000b05b0000 CR4: > 00000000000006f0 > [ 1558.053934] Call Trace: > [ 1558.054011] __btrfs_run_delayed_refs+0x216/0x10b0 [btrfs] > [ 1558.054011] ? btrfs_free_tree_block+0x82/0x2c0 [btrfs] > [ 1558.054011] btrfs_run_delayed_refs+0x78/0x180 [btrfs] > [ 1558.054011] btrfs_should_end_transaction+0x3e/0x60 [btrfs] > [ 1558.054011] btrfs_drop_snapshot+0x3cf/0x820 [btrfs] > [ 1558.054011] ? btree_submit_bio_start+0x20/0x20 [btrfs] > [ 1558.054011] btrfs_clean_one_deleted_snapshot+0xba/0xe0 [btrfs] > [ 1558.054011] cleaner_kthread+0x129/0x160 [btrfs] > [ 1558.054011] kthread+0x112/0x130 > [ 1558.054011] ? kthread_create_worker_on_cpu+0x70/0x70 > [ 1558.054011] ret_from_fork+0x35/0x40 > [ 1558.054011] 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 84 ca 00 00 4d 89 f8 4c 89 f1 48 89 ea ff b4 > [ 1558.054011] ---[ end trace c4eefd1fdc016cea ]--- > [ 1558.054832] BTRFS info (device sda3): leaf 62678286336 gen 6388 total ptrs > 148 free space 6202 owner 2 > [ 1558.054837] item 0 key (76427296768 169 0) itemoff 16250 itemsize 33 > [ 1558.054841] extent refs 1 gen 6256 flags 258 > [ 1558.054844] ref#0: shared block backref parent 76512641024 > [ 1558.054850] item 1 key (76427313152 169 0) itemoff 16217 itemsize 33 > [ 1558.054853] extent refs 1 gen 6256 flags 258 > [ 1558.054854] ref#0: shared block backref parent 76512641024 > > ]zac[ > ................................... > ]zac[ > > [ 1558.056504] item 145 key (76429721600 169 1) itemoff 10004 itemsize 33 > [ 1558.056506] extent refs 1 gen 6303 flags 258 > [ 1558.056508] ref#0: tree block backref root 1434 > [ 1558.056512] item 146 key (76429737984 169 0) itemoff 9962 itemsize 42 > [ 1558.056515] extent refs 2 gen 6277 flags 258 > [ 1558.056516] ref#0: shared block backref parent 81665769472 > [ 1558.056519] ref#1: shared block backref parent 66383904768 > [ 1558.056524] item 147 key (76429754368 169 0) itemoff 9902 itemsize 60 > [ 1558.056526] extent refs 4 gen 6256 flags 258 > [ 1558.056528] ref#0: shared block backref parent 81731174400 > [ 1558.056531] ref#1: shared block backref parent 76512641024 > [ 1558.056533] ref#2: shared block backref parent 76450250752 > [ 1558.056536] ref#3: shared block backref parent 66397339648 > [ 1558.056544] BTRFS error (device sda3): unable to find ref byte nr > 76428623872 parent 0 root 1450 owner 1 offset 0 > [ 1558.056554] ------------[ cut here ]------------ > [ 1558.056556] BTRFS: Transaction aborted (error -2) > [ 1558.056718] WARNING: CPU: 0 PID: 16871 at fs/btrfs/extent-tree.c:7007 > __btrfs_free_extent.isra.70+0x7e2/0xb10 [btrfs] > [ 1558.056720] Modules linked in: fuse xt_CHECKSUM ipt_MASQUERADE > nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast > xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack devlink ip_set > nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat > nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_raw > ip6table_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 > nf_nat nf_conntrack iptable_mangle iptable_raw iptable_security ebtable_filter > ebtables ip6table_filter ip6_tables it87 hwmon_vid sunrpc snd_hda_codec_analog > snd_hda_codec_generic snd_hda_codec_hdmi btrfs powernow_k8 amd64_edac_mod > edac_mce_amd snd_hda_intel snd_hda_codec kvm_amd xor ccp zstd_compress > snd_hda_core snd_hwdep kvm snd_seq snd_seq_device ppdev snd_pcm raid6_pq > irqbypass > [ 1558.056785] libcrc32c k8temp snd_timer zstd_decompress xxhash i2c_nforce2 > snd asus_atk0110 soundcore shpchp parport_pc parport ata_generic pata_acpi > nouveau video mxm_wmi wmi i2c_algo_bit drm_kms_helper ttm drm serio_raw > sata_nv forcedeth > [ 1558.056819] CPU: 0 PID: 16871 Comm: btrfs-cleaner Tainted: G W > 4.17.19-200.fc28.x86_64 #1 > [ 1558.056821] Hardware name: System manufacturer System Product Name/M2N, > BIOS 0902 02/16/2009 > [ 1558.056905] RIP: 0010:__btrfs_free_extent.isra.70+0x7e2/0xb10 [btrfs] > [ 1558.056908] RSP: 0018:ffffa63985f8fc30 EFLAGS: 00010286 > [ 1558.056912] RAX: 0000000000000000 RBX: ffff8b71313f8380 RCX: > 0000000000000006 > [ 1558.056914] RDX: 0000000000000007 RSI: 0000000000000086 RDI: > ffff8b717fa16930 > [ 1558.056916] RBP: 00000011cb804000 R08: 0000000000000038 R09: > 000000000000059a > [ 1558.056918] R10: 0000000000000000 R11: 0000000000000001 R12: > ffff8b715f5d4000 > [ 1558.056920] R13: 00000000fffffffe R14: 0000000000000000 R15: > 00000000000005aa > [ 1558.056924] FS: 0000000000000000(0000) GS:ffff8b717fa00000(0000) knlGS: > 0000000000000000 > [ 1558.056927] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 1558.056929] CR2: 00007fdfdffffa08 CR3: 00000000b05b0000 CR4: > 00000000000006f0 > [ 1558.056931] Call Trace: > [ 1558.057011] __btrfs_run_delayed_refs+0x216/0x10b0 [btrfs] > [ 1558.057011] ? btrfs_free_tree_block+0x82/0x2c0 [btrfs] > [ 1558.057011] btrfs_run_delayed_refs+0x78/0x180 [btrfs] > [ 1558.057011] btrfs_should_end_transaction+0x3e/0x60 [btrfs] > [ 1558.057011] btrfs_drop_snapshot+0x3cf/0x820 [btrfs] > [ 1558.057011] ? btree_submit_bio_start+0x20/0x20 [btrfs] > [ 1558.057011] btrfs_clean_one_deleted_snapshot+0xba/0xe0 [btrfs] > [ 1558.057011] cleaner_kthread+0x129/0x160 [btrfs] > [ 1558.057011] kthread+0x112/0x130 > [ 1558.057011] ? kthread_create_worker_on_cpu+0x70/0x70 > [ 1558.057011] ret_from_fork+0x35/0x40 > [ 1558.057011] 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 cc a4 09 00 44 89 ee 48 c7 c7 98 9e 75 c0 e8 58 33 a0 e7 <0f> > 0b e9 b6 a4 09 00 48 89 df e8 bf 0c ff ff 49 8b 74 24 28 4d > [ 1558.057011] ---[ end trace c4eefd1fdc016ceb ]--- > [ 1558.057734] BTRFS: error (device sda3) in __btrfs_free_extent:7007: > errno=-2 No such entry > [ 1558.057742] BTRFS info (device sda3): forced readonly > [ 1558.057757] BTRFS: error (device sda3) in btrfs_run_delayed_refs:3076: > errno=-2 No such entry
Very recently, a fix for this went into kernel 5.0-rc1: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0568e82dbe2510fc1fa664f58e5c997d3f1e649e > > gdb > > -- Filipe David Manana, “Whether you think you can, or you think you can't — you're right.”
