Bug 94401 - warnings at fs/btrfs/inode.c:8693 and fs/btrfs/inode.c:8694
Summary: warnings at fs/btrfs/inode.c:8693 and fs/btrfs/inode.c:8694
Status: RESOLVED CODE_FIX
Alias: None
Product: File System
Classification: Unclassified
Component: btrfs (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Josef Bacik
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-03-06 10:42 UTC by Markus Trippelsdorf
Modified: 2015-03-16 12:46 UTC (History)
1 user (show)

See Also:
Kernel Version: 4.0.0-rc2
Tree: Mainline
Regression: Yes

Attachments
Add an attachment (proposed patch, testcase, etc.)

Description Markus Trippelsdorf 2015-03-06 10:42:12 UTC 
Running 4.0.0-rc2 is see many instances of:

[46580.010425] ------------[ cut here ]------------
[46580.010433] WARNING: CPU: 2 PID: 3952 at fs/btrfs/inode.c:8693 btrfs_destroy_inode+0x278/0x2a0()
[46580.010435] CPU: 2 PID: 3952 Comm: rm Not tainted 4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[46580.010436] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[46580.010438]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[46580.010439]  ffffffff8106d392 0000000000000000 ffff880133f4c910 ffff880215e0d800
[46580.010441]  ffff880071e0feb8 ffff880133f4c910 ffffffff8121bbf8 ffff880189cd7000
[46580.010442] Call Trace:
[46580.010446]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[46580.010448]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[46580.010450]  [<ffffffff8121bbf8>] ? btrfs_destroy_inode+0x278/0x2a0
[46580.010452]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[46580.010454]  [<ffffffff81083a34>] ? task_work_run+0xb4/0x100
[46580.010456]  [<ffffffff8103b9a9>] ? do_notify_resume+0x69/0x80
[46580.010459]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[46580.010460] ---[ end trace 38faa947b08a7637 ]---
[46580.010460] ------------[ cut here ]------------
[46580.010462] WARNING: CPU: 2 PID: 3952 at fs/btrfs/inode.c:8694 btrfs_destroy_inode+0x1f2/0x2a0()
[46580.010463] CPU: 2 PID: 3952 Comm: rm Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[46580.010464] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[46580.010464]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[46580.010466]  ffffffff8106d392 0000000000000000 ffff880133f4c910 ffff880215e0d800
[46580.010467]  ffff880071e0feb8 ffff880133f4c910 ffffffff8121bb72 ffff880189cd7000
[46580.010468] Call Trace:
[46580.010469]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[46580.010471]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[46580.010472]  [<ffffffff8121bb72>] ? btrfs_destroy_inode+0x1f2/0x2a0
[46580.010474]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[46580.010475]  [<ffffffff81083a34>] ? task_work_run+0xb4/0x100
[46580.010476]  [<ffffffff8103b9a9>] ? do_notify_resume+0x69/0x80
[46580.010478]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[46580.010479] ---[ end trace 38faa947b08a7638 ]---
[46580.022474] ------------[ cut here ]------------
[46580.022479] WARNING: CPU: 2 PID: 3952 at fs/btrfs/inode.c:8693 btrfs_destroy_inode+0x278/0x2a0()
[46580.022481] CPU: 2 PID: 3952 Comm: rm Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[46580.022482] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[46580.022482]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[46580.022484]  ffffffff8106d392 0000000000000000 ffff88009c7fd070 ffff880215e0d800
[46580.022485]  ffff880071e0feb8 ffff88009c7fd070 ffffffff8121bbf8 ffff880189cd7000
[46580.022487] Call Trace:
[46580.022489]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[46580.022491]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[46580.022492]  [<ffffffff8121bbf8>] ? btrfs_destroy_inode+0x278/0x2a0
[46580.022494]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[46580.022496]  [<ffffffff81083a34>] ? task_work_run+0xb4/0x100
[46580.022498]  [<ffffffff8103b9a9>] ? do_notify_resume+0x69/0x80
[46580.022500]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[46580.022500] ---[ end trace 38faa947b08a7639 ]---
[46580.022501] ------------[ cut here ]------------
[46580.022502] WARNING: CPU: 2 PID: 3952 at fs/btrfs/inode.c:8694 btrfs_destroy_inode+0x1f2/0x2a0()
[46580.022504] CPU: 2 PID: 3952 Comm: rm Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[46580.022504] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[46580.022505]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[46580.022506]  ffffffff8106d392 0000000000000000 ffff88009c7fd070 ffff880215e0d800
[46580.022507]  ffff880071e0feb8 ffff88009c7fd070 ffffffff8121bb72 ffff880189cd7000
[46580.022508] Call Trace:
[46580.022509]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[46580.022511]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[46580.022512]  [<ffffffff8121bb72>] ? btrfs_destroy_inode+0x1f2/0x2a0
[46580.022514]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[46580.022515]  [<ffffffff81083a34>] ? task_work_run+0xb4/0x100
[46580.022516]  [<ffffffff8103b9a9>] ? do_notify_resume+0x69/0x80
[46580.022518]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[46580.022518] ---[ end trace 38faa947b08a763a ]---
[49554.494573] ------------[ cut here ]------------
[49554.494580] WARNING: CPU: 0 PID: 14742 at fs/btrfs/inode.c:8693 btrfs_destroy_inode+0x278/0x2a0()
[49554.494583] CPU: 0 PID: 14742 Comm: ld Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[49554.494584] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[49554.494585]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[49554.494587]  ffffffff8106d392 0000000000000000 ffff88005270bcb0 ffff880215e0d800
[49554.494588]  ffff88006e777eb8 ffff88005270bcb0 ffffffff8121bbf8 ffff88002c881000
[49554.494590] Call Trace:
[49554.494593]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[49554.494596]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[49554.494598]  [<ffffffff8121bbf8>] ? btrfs_destroy_inode+0x278/0x2a0
[49554.494600]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[49554.494602]  [<ffffffff81114b0d>] ? SYSC_newstat+0x2d/0x40
[49554.494604]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[49554.494605] ---[ end trace 38faa947b08a763b ]---
[49554.494606] ------------[ cut here ]------------
[49554.494607] WARNING: CPU: 0 PID: 14742 at fs/btrfs/inode.c:8694 btrfs_destroy_inode+0x1f2/0x2a0()
[49554.494609] CPU: 0 PID: 14742 Comm: ld Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[49554.494610] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[49554.494610]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[49554.494612]  ffffffff8106d392 0000000000000000 ffff88005270bcb0 ffff880215e0d800
[49554.494613]  ffff88006e777eb8 ffff88005270bcb0 ffffffff8121bb72 ffff88002c881000
[49554.494614] Call Trace:
[49554.494615]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[49554.494617]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[49554.494618]  [<ffffffff8121bb72>] ? btrfs_destroy_inode+0x1f2/0x2a0
[49554.494620]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[49554.494621]  [<ffffffff81114b0d>] ? SYSC_newstat+0x2d/0x40
[49554.494622]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[49554.494623] ---[ end trace 38faa947b08a763c ]---
[53493.581948] ------------[ cut here ]------------
[53493.581957] WARNING: CPU: 2 PID: 32 at fs/btrfs/inode.c:8693 btrfs_destroy_inode+0x278/0x2a0()
[53493.581961] CPU: 2 PID: 32 Comm: kswapd0 Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[53493.581962] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[53493.581963]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[53493.581965]  ffffffff8106d392 ffff8802160c7cb8 ffff8801c785ea40 ffff880215e0d800
[53493.581966]  ffff880215edc400 0000000000000000 ffffffff8121bbf8 0000000000000000
[53493.581968] Call Trace:
[53493.581972]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[53493.581975]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[53493.581977]  [<ffffffff8121bbf8>] ? btrfs_destroy_inode+0x278/0x2a0
[53493.581979]  [<ffffffff811297e1>] ? dispose_list+0x41/0x60
[53493.581981]  [<ffffffff81129ac9>] ? prune_icache_sb+0x49/0x60
[53493.581983]  [<ffffffff8111245a>] ? super_cache_scan+0x13a/0x1a0
[53493.581986]  [<ffffffff810e0e1b>] ? shrink_slab.part.52.constprop.62+0x19b/0x240
[53493.581988]  [<ffffffff810e3449>] ? shrink_zone+0x89/0xa0
[53493.581989]  [<ffffffff810e3a98>] ? kswapd+0x318/0x6c0
[53493.581991]  [<ffffffff810e3780>] ? try_to_free_pages+0x320/0x320
[53493.581993]  [<ffffffff81084c9c>] ? kthread+0xbc/0xe0
[53493.581994]  [<ffffffff81084be0>] ? __kthread_parkme+0x80/0x80
[53493.581996]  [<ffffffff816943ac>] ? ret_from_fork+0x7c/0xb0
[53493.581998]  [<ffffffff81084be0>] ? __kthread_parkme+0x80/0x80
[53493.581999] ---[ end trace 38faa947b08a763d ]---
[53493.581999] ------------[ cut here ]------------
[53493.582001] WARNING: CPU: 2 PID: 32 at fs/btrfs/inode.c:8694 btrfs_destroy_inode+0x1f2/0x2a0()
[53493.582003] CPU: 2 PID: 32 Comm: kswapd0 Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[53493.582003] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[53493.582004]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[53493.582005]  ffffffff8106d392 ffff8802160c7cb8 ffff8801c785ea40 ffff880215e0d800
[53493.582007]  ffff880215edc400 0000000000000000 ffffffff8121bb72 0000000000000000
[53493.582008] Call Trace:
[53493.582009]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[53493.582010]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[53493.582012]  [<ffffffff8121bb72>] ? btrfs_destroy_inode+0x1f2/0x2a0
[53493.582013]  [<ffffffff811297e1>] ? dispose_list+0x41/0x60
[53493.582014]  [<ffffffff81129ac9>] ? prune_icache_sb+0x49/0x60
[53493.582016]  [<ffffffff8111245a>] ? super_cache_scan+0x13a/0x1a0
[53493.582018]  [<ffffffff810e0e1b>] ? shrink_slab.part.52.constprop.62+0x19b/0x240
[53493.582019]  [<ffffffff810e3449>] ? shrink_zone+0x89/0xa0
[53493.582020]  [<ffffffff810e3a98>] ? kswapd+0x318/0x6c0
[53493.582022]  [<ffffffff810e3780>] ? try_to_free_pages+0x320/0x320
[53493.582023]  [<ffffffff81084c9c>] ? kthread+0xbc/0xe0
[53493.582025]  [<ffffffff81084be0>] ? __kthread_parkme+0x80/0x80
[53493.582026]  [<ffffffff816943ac>] ? ret_from_fork+0x7c/0xb0
[53493.582027]  [<ffffffff81084be0>] ? __kthread_parkme+0x80/0x80
[53493.582028] ---[ end trace 38faa947b08a763e ]---
[107370.855947] ------------[ cut here ]------------
[107370.855954] WARNING: CPU: 2 PID: 8428 at fs/btrfs/inode.c:8693 btrfs_destroy_inode+0x278/0x2a0()
[107370.855957] CPU: 2 PID: 8428 Comm: ninja-linux64 Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[107370.855958] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[107370.855959]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[107370.855961]  ffffffff8106d392 0000000000000000 ffff880205a83cb0 ffff880215e0d800
[107370.855962]  ffff88007ff23eb8 ffff880205a83cb0 ffffffff8121bbf8 ffff88019b56e000
[107370.855964] Call Trace:
[107370.855967]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[107370.855970]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[107370.855972]  [<ffffffff8121bbf8>] ? btrfs_destroy_inode+0x278/0x2a0
[107370.855974]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[107370.855977]  [<ffffffff8103c947>] ? math_state_restore+0x27/0x1c0
[107370.855979]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[107370.855980] ---[ end trace 38faa947b08a763f ]---
[107370.855981] ------------[ cut here ]------------
[107370.855982] WARNING: CPU: 2 PID: 8428 at fs/btrfs/inode.c:8694 btrfs_destroy_inode+0x1f2/0x2a0()
[107370.855984] CPU: 2 PID: 8428 Comm: ninja-linux64 Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[107370.855984] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[107370.855985]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[107370.855986]  ffffffff8106d392 0000000000000000 ffff880205a83cb0 ffff880215e0d800
[107370.855988]  ffff88007ff23eb8 ffff880205a83cb0 ffffffff8121bb72 ffff88019b56e000
[107370.855989] Call Trace:
[107370.855990]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[107370.855991]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[107370.855993]  [<ffffffff8121bb72>] ? btrfs_destroy_inode+0x1f2/0x2a0
[107370.855994]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[107370.855996]  [<ffffffff8103c947>] ? math_state_restore+0x27/0x1c0
[107370.855997]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[107370.855998] ---[ end trace 38faa947b08a7640 ]---
[126321.722539] ------------[ cut here ]------------
[126321.722546] WARNING: CPU: 1 PID: 20209 at fs/btrfs/inode.c:8693 btrfs_destroy_inode+0x278/0x2a0()
[126321.722549] CPU: 1 PID: 20209 Comm: rm Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[126321.722550] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[126321.722551]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[126321.722553]  ffffffff8106d392 0000000000000000 ffff8801d09d57d0 ffff880215e0d800
[126321.722554]  ffff8801921a3eb8 ffff8801d09d57d0 ffffffff8121bbf8 ffff880078636000
[126321.722556] Call Trace:
[126321.722560]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[126321.722562]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[126321.722564]  [<ffffffff8121bbf8>] ? btrfs_destroy_inode+0x278/0x2a0
[126321.722566]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[126321.722567]  [<ffffffff8112690a>] ? dput+0x12a/0x200
[126321.722569]  [<ffffffff8110e800>] ? SyS_faccessat+0x1c0/0x220
[126321.722571]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[126321.722572] ---[ end trace 38faa947b08a7641 ]---
[126321.722573] ------------[ cut here ]------------
[126321.722575] WARNING: CPU: 1 PID: 20209 at fs/btrfs/inode.c:8694 btrfs_destroy_inode+0x1f2/0x2a0()
[126321.722576] CPU: 1 PID: 20209 Comm: rm Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[126321.722577] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[126321.722577]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[126321.722579]  ffffffff8106d392 0000000000000000 ffff8801d09d57d0 ffff880215e0d800
[126321.722580]  ffff8801921a3eb8 ffff8801d09d57d0 ffffffff8121bb72 ffff880078636000
[126321.722581] Call Trace:
[126321.722582]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[126321.722584]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[126321.722585]  [<ffffffff8121bb72>] ? btrfs_destroy_inode+0x1f2/0x2a0
[126321.722586]  [<ffffffff8111f867>] ? do_unlinkat+0x1a7/0x2e0
[126321.722588]  [<ffffffff8112690a>] ? dput+0x12a/0x200
[126321.722589]  [<ffffffff8110e800>] ? SyS_faccessat+0x1c0/0x220
[126321.722590]  [<ffffffff81694452>] ? system_call_fastpath+0x12/0x17
[126321.722591] ---[ end trace 38faa947b08a7642 ]---
[185826.888634] ------------[ cut here ]------------
[185826.888643] WARNING: CPU: 0 PID: 32 at fs/btrfs/inode.c:8693 btrfs_destroy_inode+0x278/0x2a0()
[185826.888645] CPU: 0 PID: 32 Comm: kswapd0 Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[185826.888647] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[185826.888648]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[185826.888650]  ffffffff8106d392 ffff8802160c7cb8 ffff8800abf6c1b0 ffff880215e0d800
[185826.888651]  ffff880215edc400 0000000000000000 ffffffff8121bbf8 0000000000000000
[185826.888653] Call Trace:
[185826.888656]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[185826.888659]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[185826.888661]  [<ffffffff8121bbf8>] ? btrfs_destroy_inode+0x278/0x2a0
[185826.888663]  [<ffffffff811297e1>] ? dispose_list+0x41/0x60
[185826.888664]  [<ffffffff81129ac9>] ? prune_icache_sb+0x49/0x60
[185826.888667]  [<ffffffff8111245a>] ? super_cache_scan+0x13a/0x1a0
[185826.888669]  [<ffffffff810e0e1b>] ? shrink_slab.part.52.constprop.62+0x19b/0x240
[185826.888671]  [<ffffffff810e3449>] ? shrink_zone+0x89/0xa0
[185826.888672]  [<ffffffff810e3a98>] ? kswapd+0x318/0x6c0
[185826.888674]  [<ffffffff810e3780>] ? try_to_free_pages+0x320/0x320
[185826.888676]  [<ffffffff81084c9c>] ? kthread+0xbc/0xe0
[185826.888677]  [<ffffffff81084be0>] ? __kthread_parkme+0x80/0x80
[185826.888679]  [<ffffffff816943ac>] ? ret_from_fork+0x7c/0xb0
[185826.888680]  [<ffffffff81084be0>] ? __kthread_parkme+0x80/0x80
[185826.888681] ---[ end trace 38faa947b08a7643 ]---
[185826.888682] ------------[ cut here ]------------
[185826.888684] WARNING: CPU: 0 PID: 32 at fs/btrfs/inode.c:8694 btrfs_destroy_inode+0x1f2/0x2a0()
[185826.888685] CPU: 0 PID: 32 Comm: kswapd0 Tainted: G        W       4.0.0-rc2-00129-ga6c5170d1ede-dirty #114
[185826.888686] Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
[185826.888686]  0000000000000000 ffffffff81999747 ffffffff8168dac3 0000000000000000
[185826.888688]  ffffffff8106d392 ffff8802160c7cb8 ffff8800abf6c1b0 ffff880215e0d800
[185826.888689]  ffff880215edc400 0000000000000000 ffffffff8121bb72 0000000000000000
[185826.888690] Call Trace:
[185826.888691]  [<ffffffff8168dac3>] ? dump_stack+0x40/0x50
[185826.888693]  [<ffffffff8106d392>] ? warn_slowpath_common+0x72/0xc0
[185826.888694]  [<ffffffff8121bb72>] ? btrfs_destroy_inode+0x1f2/0x2a0
[185826.888696]  [<ffffffff811297e1>] ? dispose_list+0x41/0x60
[185826.888697]  [<ffffffff81129ac9>] ? prune_icache_sb+0x49/0x60
[185826.888698]  [<ffffffff8111245a>] ? super_cache_scan+0x13a/0x1a0
[185826.888700]  [<ffffffff810e0e1b>] ? shrink_slab.part.52.constprop.62+0x19b/0x240
[185826.888701]  [<ffffffff810e3449>] ? shrink_zone+0x89/0xa0
[185826.888703]  [<ffffffff810e3a98>] ? kswapd+0x318/0x6c0
[185826.888704]  [<ffffffff810e3780>] ? try_to_free_pages+0x320/0x320
[185826.888706]  [<ffffffff81084c9c>] ? kthread+0xbc/0xe0
[185826.888707]  [<ffffffff81084be0>] ? __kthread_parkme+0x80/0x80
[185826.888708]  [<ffffffff816943ac>] ? ret_from_fork+0x7c/0xb0
[185826.888710]  [<ffffffff81084be0>] ? __kthread_parkme+0x80/0x80
[185826.888710] ---[ end trace 38faa947b08a7644 ]---

v3.19 was fine.
Comment 1 Andrew Peek 2015-03-07 12:55:29 UTC 
Also seeing this problem:

Mar  6 13:04:19 file2 kernel: [50543.648445] ------------[ cut here ]------------
Mar  6 13:04:19 file2 kernel: [50543.648486] WARNING: CPU: 0 PID: 43 at /home/kernel/COD/linux/fs/btrfs/inode.c:8693 btrfs_destroy_inode+0x1d3/0x210 [btrfs]()
Mar  6 13:04:19 file2 kernel: [50543.648490] Modules linked in: nf_log_ipv4 nf_log_common xt_LOG xt_tcpudp xt_iprange xt_multiport iptable_filter ip_tables nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_h323 nf_conntrack_sane nf_conntrack_proto_udplite nf_conntrack_ftp nf_conntrack_netlink nf_conntrack_proto_dccp xt_conntrack x_tables ts_kmp nf_conntrack_amanda nf_conntrack_snmp nf_conntrack_proto_sctp nf_conntrack_sip nf_conntrack_netbios_ns nf_conntrack_tftp nf_conntrack_irc nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_broadcast nf_conntrack ip_set nfnetlink xenfs xen_privcmd ppdev serio_raw i2c_piix4 8250_fintek parport_pc mac_hid lp parport btrfs xor raid6_pq mpt2sas raid_class psmouse scsi_transport_sas pata_acpi floppy
Mar  6 13:04:19 file2 kernel: [50543.648527] CPU: 0 PID: 43 Comm: kswapd0 Not tainted 4.0.0-040000rc2-generic #201503031836
Mar  6 13:04:19 file2 kernel: [50543.648530] Hardware name: Xen HVM domU, BIOS 4.4.1-xs90192 12/09/2014
Mar  6 13:04:19 file2 kernel: [50543.648533]  00000000000021f5 ffff8800780e39f8 ffffffff817df23f 0000000000000007
Mar  6 13:04:19 file2 kernel: [50543.648538]  0000000000000000 ffff8800780e3a38 ffffffff810791a7 ffff8800780e3a48
Mar  6 13:04:19 file2 kernel: [50543.648542]  ffff88004cb81890 ffff88004cb81890 ffff8800796d9000 ffff880079778000
Mar  6 13:04:19 file2 kernel: [50543.648547] Call Trace:
Mar  6 13:04:19 file2 kernel: [50543.648594]  [<ffffffff817df23f>] dump_stack+0x45/0x57
Mar  6 13:04:19 file2 kernel: [50543.648602]  [<ffffffff810791a7>] warn_slowpath_common+0x97/0xe0
Mar  6 13:04:19 file2 kernel: [50543.648608]  [<ffffffff8107920a>] warn_slowpath_null+0x1a/0x20
Mar  6 13:04:19 file2 kernel: [50543.648626]  [<ffffffffc04efeb3>] btrfs_destroy_inode+0x1d3/0x210 [btrfs]
Mar  6 13:04:19 file2 kernel: [50543.648663]  [<ffffffff8121886c>] destroy_inode+0x3c/0x70
Mar  6 13:04:19 file2 kernel: [50543.648669]  [<ffffffff812189ba>] evict+0x11a/0x190
Mar  6 13:04:19 file2 kernel: [50543.648674]  [<ffffffff81218a71>] dispose_list+0x41/0x50
Mar  6 13:04:19 file2 kernel: [50543.648680]  [<ffffffff81219b6f>] prune_icache_sb+0x4f/0x60
Mar  6 13:04:19 file2 kernel: [50543.648691]  [<ffffffff81200e95>] super_cache_scan+0x155/0x1a0
Mar  6 13:04:19 file2 kernel: [50543.648698]  [<ffffffff81193e7f>] do_shrink_slab+0x13f/0x2c0
Mar  6 13:04:19 file2 kernel: [50543.648704]  [<ffffffff81198e90>] ? shrink_lruvec+0x330/0x370
Mar  6 13:04:19 file2 kernel: [50543.648709]  [<ffffffff81194168>] shrink_slab+0xd8/0x110
Mar  6 13:04:19 file2 kernel: [50543.648715]  [<ffffffff8119919f>] shrink_zone+0x2cf/0x300
Mar  6 13:04:19 file2 kernel: [50543.648721]  [<ffffffff811a2200>] ? zone_statistics+0x40/0xc0
Mar  6 13:04:19 file2 kernel: [50543.648727]  [<ffffffff811994c0>] kswapd_shrink_zone+0xe0/0x160
Mar  6 13:04:19 file2 kernel: [50543.648732]  [<ffffffff8119a103>] balance_pgdat+0x2c3/0x430
Mar  6 13:04:19 file2 kernel: [50543.648738]  [<ffffffff8119a393>] kswapd+0x123/0x250
Mar  6 13:04:19 file2 kernel: [50543.648744]  [<ffffffff8119a270>] ? balance_pgdat+0x430/0x430
Mar  6 13:04:19 file2 kernel: [50543.648750]  [<ffffffff81098769>] kthread+0xc9/0xe0
Mar  6 13:04:19 file2 kernel: [50543.648756]  [<ffffffff810986a0>] ? flush_kthread_worker+0x90/0x90
Mar  6 13:04:19 file2 kernel: [50543.648763]  [<ffffffff817eb8fc>] ret_from_fork+0x7c/0xb0
Mar  6 13:04:19 file2 kernel: [50543.648768]  [<ffffffff810986a0>] ? flush_kthread_worker+0x90/0x90
Mar  6 13:04:19 file2 kernel: [50543.648772] ---[ end trace 1605180ba11104b8 ]---
Mar  6 13:04:19 file2 kernel: [50543.648775] ------------[ cut here ]------------
Mar  6 13:04:19 file2 kernel: [50543.648791] WARNING: CPU: 0 PID: 43 at /home/kernel/COD/linux/fs/btrfs/inode.c:8694 btrfs_destroy_inode+0x1bd/0x210 [btrfs]()
Mar  6 13:04:19 file2 kernel: [50543.648794] Modules linked in: nf_log_ipv4 nf_log_common xt_LOG xt_tcpudp xt_iprange xt_multiport iptable_filter ip_tables nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_h323 nf_conntrack_sane nf_conntrack_proto_udplite nf_conntrack_ftp nf_conntrack_netlink nf_conntrack_proto_dccp xt_conntrack x_tables ts_kmp nf_conntrack_amanda nf_conntrack_snmp nf_conntrack_proto_sctp nf_conntrack_sip nf_conntrack_netbios_ns nf_conntrack_tftp nf_conntrack_irc nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_broadcast nf_conntrack ip_set nfnetlink xenfs xen_privcmd ppdev serio_raw i2c_piix4 8250_fintek parport_pc mac_hid lp parport btrfs xor raid6_pq mpt2sas raid_class psmouse scsi_transport_sas pata_acpi floppy
Mar  6 13:04:19 file2 kernel: [50543.648826] CPU: 0 PID: 43 Comm: kswapd0 Tainted: G        W       4.0.0-040000rc2-generic #201503031836
Mar  6 13:04:19 file2 kernel: [50543.648829] Hardware name: Xen HVM domU, BIOS 4.4.1-xs90192 12/09/2014
Mar  6 13:04:19 file2 kernel: [50543.648831]  00000000000021f6 ffff8800780e39f8 ffffffff817df23f 0000000000000007
Mar  6 13:04:19 file2 kernel: [50543.648836]  0000000000000000 ffff8800780e3a38 ffffffff810791a7 ffff8800780e3a48
Mar  6 13:04:19 file2 kernel: [50543.648840]  ffff88004cb81890 ffff88004cb81890 ffff8800796d9000 ffff880079778000
Mar  6 13:04:19 file2 kernel: [50543.648844] Call Trace:
Mar  6 13:04:19 file2 kernel: [50543.648850]  [<ffffffff817df23f>] dump_stack+0x45/0x57
Mar  6 13:04:19 file2 kernel: [50543.648856]  [<ffffffff810791a7>] warn_slowpath_common+0x97/0xe0
Mar  6 13:04:19 file2 kernel: [50543.648862]  [<ffffffff8107920a>] warn_slowpath_null+0x1a/0x20
Mar  6 13:04:19 file2 kernel: [50543.648880]  [<ffffffffc04efe9d>] btrfs_destroy_inode+0x1bd/0x210 [btrfs]
Mar  6 13:04:19 file2 kernel: [50543.648887]  [<ffffffff8121886c>] destroy_inode+0x3c/0x70
Mar  6 13:04:19 file2 kernel: [50543.648892]  [<ffffffff812189ba>] evict+0x11a/0x190
Mar  6 13:04:19 file2 kernel: [50543.648898]  [<ffffffff81218a71>] dispose_list+0x41/0x50
Mar  6 13:04:19 file2 kernel: [50543.648903]  [<ffffffff81219b6f>] prune_icache_sb+0x4f/0x60
Mar  6 13:04:19 file2 kernel: [50543.648909]  [<ffffffff81200e95>] super_cache_scan+0x155/0x1a0
Mar  6 13:04:19 file2 kernel: [50543.648915]  [<ffffffff81193e7f>] do_shrink_slab+0x13f/0x2c0
Mar  6 13:04:19 file2 kernel: [50543.648920]  [<ffffffff81198e90>] ? shrink_lruvec+0x330/0x370
Mar  6 13:04:19 file2 kernel: [50543.648926]  [<ffffffff81194168>] shrink_slab+0xd8/0x110
Mar  6 13:04:19 file2 kernel: [50543.648932]  [<ffffffff8119919f>] shrink_zone+0x2cf/0x300
Mar  6 13:04:19 file2 kernel: [50543.648937]  [<ffffffff811a2200>] ? zone_statistics+0x40/0xc0
Mar  6 13:04:19 file2 kernel: [50543.648943]  [<ffffffff811994c0>] kswapd_shrink_zone+0xe0/0x160
Mar  6 13:04:19 file2 kernel: [50543.648948]  [<ffffffff8119a103>] balance_pgdat+0x2c3/0x430
Mar  6 13:04:19 file2 kernel: [50543.648954]  [<ffffffff8119a393>] kswapd+0x123/0x250
Mar  6 13:04:19 file2 kernel: [50543.648960]  [<ffffffff8119a270>] ? balance_pgdat+0x430/0x430
Mar  6 13:04:19 file2 kernel: [50543.648965]  [<ffffffff81098769>] kthread+0xc9/0xe0
Mar  6 13:04:19 file2 kernel: [50543.648971]  [<ffffffff810986a0>] ? flush_kthread_worker+0x90/0x90
Mar  6 13:04:19 file2 kernel: [50543.648976]  [<ffffffff817eb8fc>] ret_from_fork+0x7c/0xb0
Mar  6 13:04:19 file2 kernel: [50543.648982]  [<ffffffff810986a0>] ? flush_kthread_worker+0x90/0x90
Mar  6 13:04:19 file2 kernel: [50543.648986] ---[ end trace 1605180ba11104b9 ]---
Comment 2 Markus Trippelsdorf 2015-03-07 13:14:27 UTC 
Filipe David identified the commit that causes this issue:

http://thread.gmane.org/gmane.linux.kernel/1891346/focus=43471
Comment 3 Markus Trippelsdorf 2015-03-16 12:46:58 UTC 
Fixed by Joseph's proposed patch.
Note You need to log in before you can comment on or make changes to this bug.