Hi,
When I ran a stress test for Btrfs (v3.17-rc2), then I got the following
warning messages repeatedly. I think the messages were outputted because
btrfs_block_rsv_migrate() returned as ENOSPC.
I'm not sure this is related to a bug or not...
How to reproduce:
1. Create btrfs on a 5GB partition and mount it.
# mkfs -t btrfs -f /dev/sdb5
# mount /dev/sdb5 /mnt/sdb5
2. Run a stress tests like as followings. I used LTP as the stress test.
# /opt/ltp/testscripts/ltpstress.sh -n -t 168 -d /mnt/sdb5/hogehoge &
# /opt/ltp/testcases/bin/fsstress -d /mnt/sdb5/test -n 10000 -p 100 -l 0 &
I detected the messages within three hours.
The code which output the message:
static int btrfs_delayed_inode_reserve_metadata(
struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode,
struct btrfs_delayed_node *node)
...
ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);
if (!WARN_ON(ret)) <= HERE!!
goto out;
/*
* Ok this is a problem, let's just steal from the global rsv
* since this really shouldn't happen that often.
*/
ret = btrfs_block_rsv_migrate(&root->fs_info->global_block_rsv,
dst_rsv, num_bytes);
The message:
[65058.999117] ------------[ cut here ]------------
[65058.999170] WARNING: CPU: 0 PID: 3284 at fs/btrfs/delayed-inode.c:655
btrfs_delayed_update_inode+0x2a0/0x450 [btrfs]()
[65058.999172] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT
xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables
ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle
ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle
iptable_security iptable_raw iptable_filter ip_tables sg coretemp kvm_intel
btrfs iTCO_wdt xor kvm nfsd iTCO_vendor_support raid6_pq auth_rpcgss nfs_acl
lockd crc32c_intel uinput osst ipmi_si lpc_ich st i2c_i801 i7core_edac mfd_core
ipmi_msghandler edac_core sunrpc shpchp pcspkr xfs libcrc32c sd_mod sr_mod
cdrom crc_t10dif crct10dif_common mgag200 syscopyarea sysfillrect sysimgblt
drm_kms_helper ttm usb_storage drm ahci libahci libata
[65058.999221] igb ptp pps_core megaraid_sas dca i2c_algo_bit
[65058.999230] CPU: 0 PID: 3284 Comm: kworker/u9:1 Tainted: G W
3.17.0-rc2 #1
[65058.999232] Hardware name: FUJITSU-SV PRIMERGY
/D2619, BIOS 6.00 Rev. 1.03.2619.N1 04/06/2010
[65058.999249] Workqueue: btrfs-endio-write normal_work_helper [btrfs]
[65058.999251] 0000000000000000 0000000057b6814e ffff88010096fc28
ffffffff816363b7
[65058.999254] 0000000000000000 ffff88010096fc60 ffffffff810741ad
ffff880172d1d0a0
[65058.999257] 0000000000040000 ffff880159c20958 ffff880239435000
ffff8802192411c0
[65058.999260] Call Trace:
[65058.999271] [<ffffffff816363b7>] dump_stack+0x45/0x56
[65058.999277] [<ffffffff810741ad>] warn_slowpath_common+0x7d/0xa0
[65058.999279] [<ffffffff810742da>] warn_slowpath_null+0x1a/0x20
[65058.999296] [<ffffffffa05a58d0>] btrfs_delayed_update_inode+0x2a0/0x450
[btrfs]
[65058.999311] [<ffffffffa055531c>] btrfs_update_inode+0x5c/0xd0 [btrfs]
[65058.999326] [<ffffffffa055820c>] btrfs_update_inode_fallback+0x1c/0x50
[btrfs]
[65058.999341] [<ffffffffa055876b>] btrfs_finish_ordered_io+0x52b/0x610 [btrfs]
[65058.999347] [<ffffffff810ae300>] ? pick_next_task_fair+0x590/0x870
[65058.999362] [<ffffffffa0558b65>] finish_ordered_fn+0x15/0x20 [btrfs]
[65058.999378] [<ffffffffa057f256>] normal_work_helper+0xc6/0x280 [btrfs]
[65058.999382] [<ffffffff8108c8cf>] process_one_work+0x17f/0x420
[65058.999384] [<ffffffff8108cfcb>] worker_thread+0x11b/0x510
[65058.999387] [<ffffffff8108ceb0>] ? rescuer_thread+0x340/0x340
[65058.999390] [<ffffffff81092671>] kthread+0xe1/0x100
[65058.999393] [<ffffffff81092590>] ? kthread_create_on_node+0x1a0/0x1a0
[65058.999397] [<ffffffff8163e37c>] ret_from_fork+0x7c/0xb0
[65058.999400] [<ffffffff81092590>] ? kthread_create_on_node+0x1a0/0x1a0
[65058.999402] ---[ end trace fc1325844b8e13c1 ]---
[65332.479837] ------------[ cut here ]------------
[65332.479887] WARNING: CPU: 0 PID: 3285 at fs/btrfs/delayed-inode.c:655
btrfs_delayed_update_inode+0x2a0/0x450 [btrfs]()
[65332.479889] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT
xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables
ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle
ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle
iptable_security iptable_raw iptable_filter ip_tables sg coretemp kvm_intel
btrfs iTCO_wdt xor kvm nfsd iTCO_vendor_support raid6_pq auth_rpcgss nfs_acl
lockd crc32c_intel uinput osst ipmi_si lpc_ich st i2c_i801 i7core_edac mfd_core
ipmi_msghandler edac_core sunrpc shpchp pcspkr xfs libcrc32c sd_mod sr_mod
cdrom crc_t10dif crct10dif_common mgag200 syscopyarea sysfillrect sysimgblt
drm_kms_helper ttm usb_storage drm ahci libahci libata
[65332.479939] igb ptp pps_core megaraid_sas dca i2c_algo_bit
[65332.479946] CPU: 0 PID: 3285 Comm: kworker/u9:2 Tainted: G W
3.17.0-rc2 #1
[65332.479948] Hardware name: FUJITSU-SV PRIMERGY
/D2619, BIOS 6.00 Rev. 1.03.2619.N1 04/06/2010
[65332.479966] Workqueue: btrfs-endio-write normal_work_helper [btrfs]
[65332.479968] 0000000000000000 00000000015b5564 ffff88004e863c28
ffffffff816363b7
[65332.479971] 0000000000000000 ffff88004e863c60 ffffffff810741ad
ffff880104441c80
[65332.479974] 0000000000040000 ffff8801635dc578 ffff880239435000
ffff8802192411c0
[65332.479977] Call Trace:
[65332.479986] [<ffffffff816363b7>] dump_stack+0x45/0x56
[65332.479991] [<ffffffff810741ad>] warn_slowpath_common+0x7d/0xa0
[65332.479994] [<ffffffff810742da>] warn_slowpath_null+0x1a/0x20
[65332.480011] [<ffffffffa05a58d0>] btrfs_delayed_update_inode+0x2a0/0x450
[btrfs]
[65332.480026] [<ffffffffa055531c>] btrfs_update_inode+0x5c/0xd0 [btrfs]
[65332.480041] [<ffffffffa055820c>] btrfs_update_inode_fallback+0x1c/0x50
[btrfs]
[65332.480056] [<ffffffffa055876b>] btrfs_finish_ordered_io+0x52b/0x610 [btrfs]
[65332.480061] [<ffffffff810ae300>] ? pick_next_task_fair+0x590/0x870
[65332.480076] [<ffffffffa0558b65>] finish_ordered_fn+0x15/0x20 [btrfs]
[65332.480093] [<ffffffffa057f256>] normal_work_helper+0xc6/0x280 [btrfs]
[65332.480097] [<ffffffff8108c8cf>] process_one_work+0x17f/0x420
[65332.480100] [<ffffffff8108cfcb>] worker_thread+0x11b/0x510
[65332.480102] [<ffffffff8108ceb0>] ? rescuer_thread+0x340/0x340
[65332.480106] [<ffffffff81092671>] kthread+0xe1/0x100
[65332.480109] [<ffffffff81092590>] ? kthread_create_on_node+0x1a0/0x1a0
[65332.480115] [<ffffffff8163e37c>] ret_from_fork+0x7c/0xb0
[65332.480117] [<ffffffff81092590>] ? kthread_create_on_node+0x1a0/0x1a0
[65332.480119] ---[ end trace fc1325844b8e13c2 ]---
[65332.618477] ------------[ cut here ]------------
Thanks,
Masayoshi Mizuma
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