Hi,
While running xfstests, btrfs/057 complained with a WARNING, and I've
changed WARNING a bit to show the wrong accounting number.
(This did not occur in every run, but it's quite easy to reproduce on
my box, and I use two 2G ramdisks.)
Can someone who is familar with qgroup take a look at this problem?
======================================================================
The warning is
WARN_ON(sign < 0 && qgroup->excl < oper->num_bytes);
======================================================================
Here is the output of xfstests:
SECTION -- btrfs
RECREATING -- btrfs on /dev/vdd
FSTYP -- btrfs
PLATFORM -- Linux/x86_64 localhost 3.18.0-rc6+
MKFS_OPTIONS -- /dev/vdc
MOUNT_OPTIONS -- -o context=system_u:object_r:nfs_t:s0 /dev/vdc /mnt/scratch
btrfs/057 - output mismatch (see
/root/1_source/xfstests/results/120414_1913/btrfs/btrfs/057.out.bad)
--- tests/btrfs/057.out 2014-08-15 10:17:55.025724505 +0800
+++
/root/1_source/xfstests/results/120414_1913/btrfs/btrfs/057.out.bad 2014-12-04
19:13:38.825553475 +0800
@@ -1,3 +1,3 @@
QA output created by 057
-4096 4096
-4096 4096
+4096 18446744073709547520
+4096 18446744073709547520
...
(Run 'diff -u tests/btrfs/057.out
/root/1_source/xfstests/results/120414_1913/btrfs/btrfs/057.out.bad' to see
the entire diff)
Ran: btrfs/057
Failures: btrfs/057
Failed 1 of 1 tests
======================================================================
Here is the stack:
[ 43.120200] BTRFS info (device vdc): disk space caching is enabled
[ 43.125667] BTRFS: creating UUID tree
[ 43.128145] SELinux: initialized (dev vdc, type btrfs), uses mountpoint
labeling
[ 47.171882] BTRFS info (device vdc): qgroup_rescan_init failed with -115
[ 47.276730] BTRFS info (device vdc): qgroup scan completed
[ 47.476488] ------------[ cut here ]------------
[ 47.477682] WARNING: CPU: 1 PID: 61 at fs/btrfs/qgroup.c:1422
btrfs_delayed_qgroup_accounting+0x5a0/0xf50()
[ 47.480016] qgroup->excl=217088, oper->num=221184
( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ )
[ 47.481182] Modules linked in:
[ 47.482092] CPU: 1 PID: 61 Comm: kworker/u8:1 Not tainted 3.18.0-rc6+ #446
[ 47.483951] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
[ 47.487439] Workqueue: btrfs-extent-refs btrfs_extent_refs_helper
[ 47.488621] 0000000000000009 ffff88001e12baf8 ffffffff81820d8d
0000000000000001
[ 47.490674] ffff88001e12bb48 ffff88001e12bb38 ffffffff8107819c
0000000000000000
[ 47.492559] ffff88001e441000 ffff88001f4fce08 ffffffffffffffff
ffff88001e441058
[ 47.494379] Call Trace:
[ 47.494884] [<ffffffff81820d8d>] dump_stack+0x4e/0x68
[ 47.495722] [<ffffffff8107819c>] warn_slowpath_common+0x8c/0xc0
[ 47.496964] [<ffffffff81078286>] warn_slowpath_fmt+0x46/0x50
[ 47.497944] [<ffffffff81829a11>] ? _raw_spin_lock+0x41/0x50
[ 47.498907] [<ffffffff814092d0>] btrfs_delayed_qgroup_accounting+0x5a0/0xf50
[ 47.500047] [<ffffffff81390991>] btrfs_run_delayed_refs+0x271/0x2c0
[ 47.500999] [<ffffffff81391077>] delayed_ref_async_start+0x37/0x90
[ 47.501967] [<ffffffff813d2bdd>] normal_work_helper+0xdd/0x330
[ 47.502930] [<ffffffff813d3062>] btrfs_extent_refs_helper+0x12/0x20
[ 47.503992] [<ffffffff81090f75>] process_one_work+0x1c5/0x500
[ 47.504936] [<ffffffff81090efc>] ? process_one_work+0x14c/0x500
[ 47.505924] [<ffffffff8109167b>] worker_thread+0x11b/0x450
[ 47.506862] [<ffffffff81091560>] ? rescuer_thread+0x270/0x270
[ 47.507822] [<ffffffff810975a4>] kthread+0xe4/0x100
[ 47.508672] [<ffffffff810974c0>] ? flush_kthread_worker+0x70/0x70
[ 47.509699] [<ffffffff8182a7ec>] ret_from_fork+0x7c/0xb0
[ 47.510605] [<ffffffff810974c0>] ? flush_kthread_worker+0x70/0x70
[ 47.511618] ---[ end trace 48407548559b14ea ]---
[ 47.872350] ------------[ cut here ]------------
[ 47.873122] WARNING: CPU: 0 PID: 1361 at fs/btrfs/qgroup.c:1422
btrfs_delayed_qgroup_accounting+0x5a0/0xf50()
[ 47.874957] qgroup->excl=0, oper->num=4096
( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ )
[ 47.884067] Modules linked in:
[ 47.885312] CPU: 0 PID: 1361 Comm: btrfs Tainted: G W 3.18.0-rc6+ #446
[ 47.887145] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
[ 47.890041] 0000000000000009 ffff88003e8e7aa8 ffffffff81820d8d
0000000000000001
[ 47.892044] ffff88003e8e7af8 ffff88003e8e7ae8 ffffffff8107819c
0000000000000000
[ 47.894031] ffff880020a87080 ffff88001f4fc388 ffffffffffffffff
ffff880020a870d8
[ 47.895992] Call Trace:
[ 47.896630] [<ffffffff81820d8d>] dump_stack+0x4e/0x68
[ 47.897779] [<ffffffff8107819c>] warn_slowpath_common+0x8c/0xc0
[ 47.899107] [<ffffffff81078286>] warn_slowpath_fmt+0x46/0x50
[ 47.900404] [<ffffffff81829a11>] ? _raw_spin_lock+0x41/0x50
[ 47.901683] [<ffffffff814092d0>] btrfs_delayed_qgroup_accounting+0x5a0/0xf50
[ 47.903259] [<ffffffff81390991>] btrfs_run_delayed_refs+0x271/0x2c0
[ 47.904670] [<ffffffff813a1b7e>] btrfs_commit_transaction+0x4e/0xa10
[ 47.906121] [<ffffffff8136ea77>] btrfs_sync_fs+0x67/0xe0
[ 47.907380] [<ffffffff813db62d>] btrfs_ioctl+0x1a2d/0x2b50
[ 47.908673] [<ffffffff8182a2bb>] ? _raw_spin_unlock+0x2b/0x40
[ 47.910241] [<ffffffff81437c24>] ? avc_has_perm+0x24/0x1d0
[ 47.911497] [<ffffffff81437d0d>] ? avc_has_perm+0x10d/0x1d0
[ 47.912776] [<ffffffff81437d25>] ? avc_has_perm+0x125/0x1d0
[ 47.914231] [<ffffffff81437c24>] ? avc_has_perm+0x24/0x1d0
[ 47.915512] [<ffffffff810efb4b>] ? current_kernel_time+0x5b/0xb0
[ 47.916995] [<ffffffff81207fc8>] do_vfs_ioctl+0x88/0x570
[ 47.918216] [<ffffffff81439347>] ? inode_has_perm.isra.24+0x27/0x30
[ 47.919644] [<ffffffff814393e7>] ? file_has_perm+0x97/0xb0
[ 47.920909] [<ffffffff811222a4>] ? __audit_syscall_entry+0xb4/0x110
[ 47.922331] [<ffffffff81208541>] SyS_ioctl+0x91/0xb0
[ 47.923485] [<ffffffff8182a892>] system_call_fastpath+0x12/0x17
[ 47.925122] ---[ end trace 48407548559b14eb ]---
Thanks,
-liubo
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