Am 29.07.2016 um 21:11 schrieb Omar Sandoval:
> 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.
Thanks.
>> ------------[ 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 }
Yes it does.
But the kernel i'm using is somewhat special i'm using a 4.4 kernel with
a patchset from holger (CC'ed). See here:
https://github.com/hhoffstaette/kernel-patches/tree/c9cce0933a40db84627241143b123210aee0fde6/4.4.15
>> 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
>
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