>On 09/15/15 21:15, Josef Bacik wrote: >> On 09/15/2015 03:08 PM, Holger Hoffstätte wrote: >>> On 09/15/15 17:50, Holger Hoffstätte wrote: >>>> This V2 does indeed seem to fix the issues I reported with snapshot >>>> deletion & concurrent sync. I've now created/filled/deleted countless >>>> snapshots while issuing sync(s) in parallel, and the problem that I >>>> saw fairly frequently with V1 no longer seems to occur here. >>> >>> Well..I may have spoken too soon: >> >> Huh this doesn't seem related to my stuff. Can I have your script you >> are running to reproduce this? Thanks, > >This was manual - deleted two large files, deleted two snapshots (one >from the modified subvolume and one sibling), let it sit in the background >while doing something else for a few seconds and found the messages. >Don't know how to reproduce this as it didn't show up previously. > >-h We are seeing a very similar problem fwiw. Unfortunately we can't reproduce this reliably, but it is cropping up regularly. Here's a chore we are using to track our work on this: [2]. Here's the kernel log: [610194.395845] WARNING: CPU: 3 PID: 29166 at /build/linux-lts-vivid-BZwsXG/linux-lts-vivid-3.19.0/fs/btrfs/super.c:260 __btrfs_abort_transaction+0x54/0x130 [btrfs]() [610194.395847] BTRFS: Transaction aborted (error -2) [610194.395848] Modules linked in: dummy xt_NFLOG nfnetlink_log nfnetlink xt_tcpudp xt_iprange ipt_MASQUERADE nf_nat_masquerade_ipv4 veth xt_nat nf_log_ipv4 nf_log_common xt_LOG bridge stp llc iptable_nat nf_nat_ipv4 nf_nat ipt_REJECT nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables x_tables btrfs xor raid6_pq x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd nfsd auth_rpcgss nfs_acl nfs lockd grace sunrpc fscache [610194.395881] CPU: 3 PID: 29166 Comm: garden-linux Tainted: G WC 3.19.0-26-generic #28~14.04.1-Ubuntu [610194.395883] ffffffffc046ff40 ffff88000ba77968 ffffffff817aeed7 0000000000000000 [610194.395886] ffff88000ba779b8 ffff88000ba779a8 ffffffff81074d8a ffff8801605fee38 [610194.395889] ffff8801bc069210 ffff880005dd5800 00000000fffffffe ffffffffc046c390 [610194.395892] Call Trace: [610194.395899] [<ffffffff817aeed7>] dump_stack+0x45/0x57 [610194.395904] [<ffffffff81074d8a>] warn_slowpath_common+0x8a/0xc0 [610194.395907] [<ffffffff81074e06>] warn_slowpath_fmt+0x46/0x50 [610194.395917] [<ffffffffc03bff14>] __btrfs_abort_transaction+0x54/0x130 [btrfs] [610194.395930] [<ffffffffc03ec686>] create_pending_snapshot+0x5a6/0x9b0 [btrfs] [610194.395943] [<ffffffffc03ecb19>] create_pending_snapshots+0x89/0xb0 [btrfs] [610194.395955] [<ffffffffc03ee0ae>] btrfs_commit_transaction+0x47e/0xa30 [btrfs] [610194.395970] [<ffffffffc0423070>] ? btrfs_mksubvol.isra.28+0x310/0x550 [btrfs] [610194.395983] [<ffffffffc0423297>] btrfs_mksubvol.isra.28+0x537/0x550 [btrfs] [610194.395987] [<ffffffff810b4e10>] ? prepare_to_wait_event+0x110/0x110 [610194.395999] [<ffffffffc0423436>] btrfs_ioctl_snap_create_transid+0x186/0x190 [btrfs] [610194.396011] [<ffffffffc0423596>] btrfs_ioctl_snap_create_v2+0xe6/0x140 [btrfs] [610194.396024] [<ffffffffc04259de>] btrfs_ioctl+0xfbe/0x2ac0 [btrfs] [610194.396028] [<ffffffff811fbe83>] ? path_openat+0x93/0x5a0 [610194.396032] [<ffffffff81061eba>] ? __do_page_fault+0x1ea/0x5b0 [610194.396035] [<ffffffff811ffbf8>] do_vfs_ioctl+0x2f8/0x510 [610194.396038] [<ffffffff811fc3b6>] ? final_putname+0x26/0x50 [610194.396041] [<ffffffff811fc659>] ? putname+0x29/0x40 [610194.396043] [<ffffffff811ffe91>] SyS_ioctl+0x81/0xa0 [610194.396047] [<ffffffff817b688d>] system_call_fastpath+0x16/0x1b [610194.396049] ---[ end trace 8477fc3336b22b20 ]--- [610194.396075] BTRFS: error (device loop1) in create_pending_snapshot:1392: errno=-2 No such entry [610194.396186] BTRFS info (device loop1): forced readonly [610194.396189] BTRFS warning (device loop1): Skipping commit of aborted transaction. [610194.396191] BTRFS: error (device loop1) in cleanup_transaction:1670: errno=-2 No such entry [610194.396290] BTRFS info (device loop1): delayed_refs has NO entry and the version and btrfs info: $> uname -a Linux 1987d92f-d5e0-479c-8744-bb9dca7a28a1 3.19.0-26-generic #28~14.04.1-Ubuntu SMP Wed Aug 12 14:09:17 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux $> btrfs --version btrfs-progs v4.1.2 $> btrfs fi show Label: none uuid: 13d624be-b162-4794-8edb-82270d68295d Total devices 1 FS bytes used 5.40GiB devid 1 size 29.75GiB used 10.04GiB path /dev/loop2 btrfs-progs v4.1.2 $> btrfs fi df /var/vcap/data/garden/btrfs_graph Data, single: total=6.01GiB, used=4.66GiB System, DUP: total=8.00MiB, used=16.00KiB System, single: total=4.00MiB, used=0.00B Metadata, DUP: total=1.50GiB, used=752.88MiB Metadata, single: total=8.00MiB, used=0.00B GlobalReserve, single: total=128.00MiB, used=0.00B These plus the full dmesg log are available in [1]. Regards, Glyn Normington & George Lestaris [1] https://www.dropbox.com/s/v9wc9ampjw0fa8b/btrfs-diagnostics.txt?dl=1 [2] https://www.pivotaltracker.com/story/show/103489222 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
