On Fri, Jul 29, 2016 at 08:40:26PM +0200, Stefan Priebe - Profihost AG wrote:
> Dear list,
>
> i'm seeing btrfs no space messages frequently on big filesystems (> 30TB).
>
> In all cases i'm getting a trace like this one a space_info warning.
> (since commit [1]). Could someone please be so kind and help me
> debugging / fixing this bug? I'm using space_cache=v2 on all those systems.
Hm, so I think this indicates a bug in space accounting somewhere else
rather than the free space tree itself. I haven't debugged one of these
issues before, I'll see if I can reproduce it. Cc'ing Josef, too.
> ------------[ cut here ]------------
> WARNING: CPU: 5 PID: 26421 at fs/btrfs/extent-tree.c:5710
Do these line numbers match up with yours?
5706 static void release_global_block_rsv(struct btrfs_fs_info *fs_info)
5707 {
5708 block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv,
NULL,
5709 (u64)-1);
5710 WARN_ON(fs_info->delalloc_block_rsv.size > 0);
5711 WARN_ON(fs_info->delalloc_block_rsv.reserved > 0);
5712 WARN_ON(fs_info->trans_block_rsv.size > 0);
5713 WARN_ON(fs_info->trans_block_rsv.reserved > 0);
5714 WARN_ON(fs_info->chunk_block_rsv.size > 0);
5715 WARN_ON(fs_info->chunk_block_rsv.reserved > 0);
5716 WARN_ON(fs_info->delayed_block_rsv.size > 0);
5717 WARN_ON(fs_info->delayed_block_rsv.reserved > 0);
5718 }
> btrfs_free_block_groups+0x35a/0x400 [btrfs]()
> Modules linked in: netconsole ipt_REJECT nf_reject_ipv4 mpt3sas
> raid_class scsi_transport_sas xt_multiport iptable_filter ip_tables
> x_tables 8021q garp bonding coretemp loop i40e(O) vxlan ip6_udp_tunnel
> usbhid udp_tunnel sb_edac ehci_pci edac_core ehci_hcd i2c_i801 i2c_core
> usbcore shpchp usb_common ipmi_si ipmi_msghandler button btrfs dm_mod
> raid1 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx
> xor raid6_pq md_mod ixgbe mdio sg sd_mod ahci ptp libahci megaraid_sas
> pps_core
> CPU: 5 PID: 26421 Comm: umount Tainted: G W O 4.4.15+43-ph #1
> Hardware name: Supermicro X10DRH/X10DRH-iT, BIOS 1.0c 02/18/2015
> 0000000000000000 ffff880ae8b47cd8 ffffffffbd3c712f 0000000000000000
> ffffffffc03ec603 ffff880ae8b47d18 ffffffffbd0837e7 00000047a0000000
> 0000000000000000 ffff8806016a1400 ffff8808881d2088 ffff8808881d2000
> Call Trace:
> [<ffffffffbd3c712f>] dump_stack+0x63/0x84
> [<ffffffffbd0837e7>] warn_slowpath_common+0x97/0xe0
> [<ffffffffbd08384a>] warn_slowpath_null+0x1a/0x20
> [<ffffffffc034a17a>] btrfs_free_block_groups+0x35a/0x400 [btrfs]
> [<ffffffffc035ba4b>] close_ctree+0x15b/0x330 [btrfs]
> [<ffffffffc03291f9>] btrfs_put_super+0x19/0x20 [btrfs]
> [<ffffffffbd1cd33f>] generic_shutdown_super+0x6f/0x100
> [<ffffffffbd1cd866>] kill_anon_super+0x16/0x30
> [<ffffffffc032f96a>] btrfs_kill_super+0x1a/0xb0 [btrfs]
> [<ffffffffbd1cda31>] deactivate_locked_super+0x51/0x90
> [<ffffffffbd1ce42e>] deactivate_super+0x4e/0x70
> [<ffffffffbd1e9373>] cleanup_mnt+0x43/0x90
> [<ffffffffbd1e9412>] __cleanup_mnt+0x12/0x20
> [<ffffffffbd09ef8e>] task_work_run+0x7e/0xa0
> [<ffffffffbd07e550>] exit_to_usermode_loop+0x66/0x95
> [<ffffffffbd002a56>] syscall_return_slowpath+0xa6/0xf0
> [<ffffffffbd6b6f4c>] int_ret_from_sys_call+0x25/0x8f
> ---[ end trace bd985b05cc90617f ]---
> ------------[ cut here ]------------
> WARNING: CPU: 5 PID: 26421 at fs/btrfs/extent-tree.c:5711
> btrfs_free_block_groups+0x3f4/0x400 [btrfs]()
> Modules linked in: netconsole ipt_REJECT nf_reject_ipv4 mpt3sas
> raid_class scsi_transport_sas xt_multiport iptable_filter ip_tables
> x_tables 8021q garp bonding coretemp loop i40e(O) vxlan ip6_udp_tunnel
> usbhid udp_tunnel sb_edac ehci_pci edac_core ehci_hcd i2c_i801 i2c_core
> usbcore shpchp usb_common ipmi_si ipmi_msghandler button btrfs dm_mod
> raid1 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx
> xor raid6_pq md_mod ixgbe mdio sg sd_mod ahci ptp libahci megaraid_sas
> pps_core
> CPU: 5 PID: 26421 Comm: umount Tainted: G W O 4.4.15+43-ph #1
> Hardware name: Supermicro X10DRH/X10DRH-iT, BIOS 1.0c 02/18/2015
> 0000000000000000 ffff880ae8b47cd8 ffffffffbd3c712f 0000000000000000
> ffffffffc03ec603 ffff880ae8b47d18 ffffffffbd0837e7 00000047a0000000
> 0000000000000000 ffff8806016a1400 ffff8808881d2088 ffff8808881d2000
> Call Trace:
> [<ffffffffbd3c712f>] dump_stack+0x63/0x84
> [<ffffffffbd0837e7>] warn_slowpath_common+0x97/0xe0
> [<ffffffffbd08384a>] warn_slowpath_null+0x1a/0x20
> [<ffffffffc034a214>] btrfs_free_block_groups+0x3f4/0x400 [btrfs]
> [<ffffffffc035ba4b>] close_ctree+0x15b/0x330 [btrfs]
> [<ffffffffc03291f9>] btrfs_put_super+0x19/0x20 [btrfs]
> [<ffffffffbd1cd33f>] generic_shutdown_super+0x6f/0x100
> [<ffffffffbd1cd866>] kill_anon_super+0x16/0x30
> [<ffffffffc032f96a>] btrfs_kill_super+0x1a/0xb0 [btrfs]
> [<ffffffffbd1cda31>] deactivate_locked_super+0x51/0x90
> [<ffffffffbd1ce42e>] deactivate_super+0x4e/0x70
> [<ffffffffbd1e9373>] cleanup_mnt+0x43/0x90
> [<ffffffffbd1e9412>] __cleanup_mnt+0x12/0x20
> [<ffffffffbd09ef8e>] task_work_run+0x7e/0xa0
> [<ffffffffbd07e550>] exit_to_usermode_loop+0x66/0x95
> [<ffffffffbd002a56>] syscall_return_slowpath+0xa6/0xf0
> [<ffffffffbd6b6f4c>] int_ret_from_sys_call+0x25/0x8f
> ---[ end trace bd985b05cc906180 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 5 PID: 26421 at fs/btrfs/extent-tree.c:9990
I don't see what warning this is in kdave/for-next.
> btrfs_free_block_groups+0x2a4/0x400 [btrfs]()
> Modules linked in: netconsole ipt_REJECT nf_reject_ipv4 mpt3sas
> raid_class scsi_transport_sas xt_multiport iptable_filter ip_tables
> x_tables 8021q garp bonding coretemp loop i40e(O) vxlan ip6_udp_tunnel
> usbhid udp_tunnel sb_edac ehci_pci edac_core ehci_hcd i2c_i801 i2c_core
> usbcore shpchp usb_common ipmi_si ipmi_msghandler button btrfs dm_mod
> raid1 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx
> xor raid6_pq md_mod ixgbe mdio sg sd_mod ahci ptp libahci megaraid_sas
> pps_core
> CPU: 5 PID: 26421 Comm: umount Tainted: G W O 4.4.15+43-ph #1
> Hardware name: Supermicro X10DRH/X10DRH-iT, BIOS 1.0c 02/18/2015
> 0000000000000000 ffff880ae8b47cd8 ffffffffbd3c712f 0000000000000000
> ffffffffc03ec603 ffff880ae8b47d18 ffffffffbd0837e7 ffff880c6aaa4528
> 0000000000000038 0000000000000000 ffff8802fe8d8c88 ffff8808881d2000
> Call Trace:
> [<ffffffffbd3c712f>] dump_stack+0x63/0x84
> [<ffffffffbd0837e7>] warn_slowpath_common+0x97/0xe0
> [<ffffffffbd08384a>] warn_slowpath_null+0x1a/0x20
> [<ffffffffc034a0c4>] btrfs_free_block_groups+0x2a4/0x400 [btrfs]
> [<ffffffffc035ba4b>] close_ctree+0x15b/0x330 [btrfs]
> [<ffffffffc03291f9>] btrfs_put_super+0x19/0x20 [btrfs]
> [<ffffffffbd1cd33f>] generic_shutdown_super+0x6f/0x100
> [<ffffffffbd1cd866>] kill_anon_super+0x16/0x30
> [<ffffffffc032f96a>] btrfs_kill_super+0x1a/0xb0 [btrfs]
> [<ffffffffbd1cda31>] deactivate_locked_super+0x51/0x90
> [<ffffffffbd1ce42e>] deactivate_super+0x4e/0x70
> [<ffffffffbd1e9373>] cleanup_mnt+0x43/0x90
> [<ffffffffbd1e9412>] __cleanup_mnt+0x12/0x20
> [<ffffffffbd09ef8e>] task_work_run+0x7e/0xa0
> [<ffffffffbd07e550>] exit_to_usermode_loop+0x66/0x95
> [<ffffffffbd002a56>] syscall_return_slowpath+0xa6/0xf0
> [<ffffffffbd6b6f4c>] int_ret_from_sys_call+0x25/0x8f
> ---[ end trace bd985b05cc906181 ]---
> BTRFS: space_info 4 has 18446743491956604928 free, is not full
> BTRFS: space_info total=307627032576, used=206629289984, pinned=0,
> reserved=0, may_use=682750558208, readonly=131072
>
> Greets,
> Stefan
>
> [1]
> https://git.kernel.org/cgit/linux/kernel/git/kdave/linux.git/commit/?h=for-next&id=d555b6c380c644af63dbdaa7cc14bba041a4e4dd
--
Omar
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