Re: btrfs hang on brd
On 03/06/11 12:41, Adrian Hunter wrote: No improvement on 3.0-rc1+ (commit 5c6cce92bc8aee751aafe82c5d9caf7553226a3d). And on 59c5f46fbe01a00eedf54a23789634438bb80603 Linux 3.0-rc2 btrfs quickly fails to mount due to no space e.g. Script -- #!/bin/sh sudo modprobe brd rd_size=262144 sudo umount /mnt/test/ 2> /dev/null echo 'mkfs.btrfs /dev/ram0' sudo mkfs.btrfs /dev/ram0 sudo mkdir -p /mnt/test echo 'mount -t btrfs /dev/ram0 /mnt/test' sudo mount -t btrfs /dev/ram0 /mnt/test sudo mkdir -p /mnt/test/test sudo chown $USER /mnt/test/test sudo chgrp $USER /mnt/test/test sudo umount /mnt/test full=0 i=0 while true; do sudo mount -t btrfs /dev/ram0 /mnt/test if df | grep ram0 | grep 100% > /dev/null; then full=`expr $full \+ 1` if test $full -gt 6;then rm -rf /mnt/test/test/* full=0 fi else full=0 fi fsstress -c -r -d /mnt/test/test -p 3 -n 1000 -l 10 sudo umount /mnt/test i=`expr $i \+ 1` echo $i done Script Output - mkfs.btrfs /dev/ram0 WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL WARNING! - see http://btrfs.wiki.kernel.org before using fs created label (null) on /dev/ram0 nodesize 4096 leafsize 4096 sectorsize 4096 size 256.00MB Btrfs Btrfs v0.19 mount -t btrfs /dev/ram0 /mnt/test 1 2 3 4 mount: No space left on device ^C Kernel messages --- [ 95.084429] brd: module loaded [ 95.368708] Btrfs loaded [ 95.369455] device fsid 9644bae59f78285c-8db3a698a8a82293 devid 1 transid 7 /dev/ram0 [ 95.370582] SELinux: initialized (dev ram0, type btrfs), uses xattr [ 95.487905] device fsid 9644bae59f78285c-8db3a698a8a82293 devid 1 transid 10 /dev/ram0 [ 95.49] SELinux: initialized (dev ram0, type btrfs), uses xattr [ 107.336869] device fsid 9644bae59f78285c-8db3a698a8a82293 devid 1 transid 2664 /dev/ram0 [ 107.338873] SELinux: initialized (dev ram0, type btrfs), uses xattr [ 115.861909] device fsid 9644bae59f78285c-8db3a698a8a82293 devid 1 transid 6816 /dev/ram0 [ 115.864089] SELinux: initialized (dev ram0, type btrfs), uses xattr [ 122.586606] device fsid 9644bae59f78285c-8db3a698a8a82293 devid 1 transid 10872 /dev/ram0 [ 122.587779] SELinux: initialized (dev ram0, type btrfs), uses xattr [ 128.824401] BTRFS: inode 19622 still on the orphan list [ 128.844945] [ cut here ] [ 128.844969] WARNING: at fs/btrfs/extent-tree.c:6878 btrfs_free_block_groups+0x1e6/0x228 [btrfs]() [ 128.844973] Hardware name: XPS 8300 [ 128.844974] Modules linked in: btrfs zlib_deflate libcrc32c brd tun fuse cpufreq_ondemand acpi_cpufreq freq_table mperf ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipv6 uinput snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm broadcom snd_timer snd tg3 pcspkr joydev iTCO_wdt iTCO_vendor_support soundcore snd_page_alloc i2c_i801 serio_raw dcdbas microcode usb_storage i915 drm_kms_helper drm i2c_algo_bit i2c_core video [last unloaded: scsi_wait_scan] [ 128.845024] Pid: 2503, comm: umount Not tainted 3.0.0-rc2-2011-06-06-02+ #13 [ 128.845026] Call Trace: [ 128.845035] [] warn_slowpath_common+0x85/0x9d [ 128.845050] [] ? btrfs_free_block_groups+0x204/0x228 [btrfs] [ 128.845056] [] warn_slowpath_null+0x1a/0x1c [ 128.845069] [] btrfs_free_block_groups+0x1e6/0x228 [btrfs] [ 128.845087] [] close_ctree+0x22c/0x346 [btrfs] [ 128.845092] [] ? should_resched+0xe/0x2e [ 128.845097] [] ? _cond_resched+0xe/0x22 [ 128.845100] [] ? down_write+0x29/0x49 [ 128.845110] [] btrfs_put_super+0x1d/0x2c [btrfs] [ 128.845116] [] generic_shutdown_super+0x74/0xe9 [ 128.845120] [] kill_anon_super+0x16/0x50 [ 128.845125] [] deactivate_locked_super+0x26/0x4b [ 128.845129] [] deactivate_super+0x3a/0x3f [ 128.845133] [] mntput_no_expire+0xd0/0xd5 [ 128.845136] [] sys_umount+0x2dc/0x30a [ 128.845141] [] ? path_put+0x22/0x27 [ 128.845145] [] system_call_fastpath+0x16/0x1b [ 128.845149] ---[ end trace e535ebf83dd43354 ]--- [ 128.845152] space_info has 8814592 free, is full [ 128.845156] space_info total=41943040, used=24576000, pinned=0, reserved=98304, may_use=0, readonly=8454144 [ 128.897312] device fsid 9644bae59f78285c-8db3a698a8a82293 devid 1 transid 14722 /dev/ram0 [ 128.910740] BTRFS: inode 19622 still on the orphan list [ 128.910747] btrfs: could not do orphan cleanup -28 [ 128.948912] btrfs: open_ctree failed -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs hang on brd
On 01/06/11 13:07, Adrian Hunter wrote:
On 01/06/11 11:54, David Sterba wrote:
On Tue, May 31, 2011 at 10:03:12AM +0300, Adrian Hunter wrote:
Hi
I seem to be able to get btrfs reproducibly to
produce warnings and finally hang when running
a stress test on a ramdisk.
Testing was done using the "integration-test"
branch of btrfs-unstable. Note that I also tested
v2.6.39 and "integration-test" took much longer to
hang i.e. it is an improvement
The test script and stack dumps are below.
Is this a valid test?
Is it worth me investigating these?
I've tried to reproduce myself, but the fsstress utility (taken from
latest LTP suite) crashes sometimes and I cannot take it as a proper
reproduction. Can you point me to the exact version you used?
The LTP version does not compile properly:
make[4]: Entering directory
`/home/ahunter/Desktop/Projects/ltp/ltp-full-20110228/testcases/kernel/fs/fsstress'
gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -DNO_XFS
-I/home/ahunter/Desktop/Projects/ltp/ltp-full-20110228/testcases/kernel/fs/fsstress
-D_LARGEFILE64_SOURCE -D_GNU_SOURCE -Wno-error -I../../../../include
-I../../../../include -L../../../../lib fsstress.c -o fsstress
fsstress.c: In function 'dread_f':
fsstress.c:1829:2: warning: implicit declaration of function 'memalign'
fsstress.c:1829:6: warning: assignment makes pointer from integer
without a cast
fsstress.c: In function 'dwrite_f':
fsstress.c:1912:6: warning: assignment makes pointer from integer
without a cast
fsstress.c:1844:17: warning: 'diob.d_miniosz' may be used uninitialized
in this function
fsstress.c:1844:17: warning: 'diob.d_maxiosz' may be used uninitialized
in this function
fsstress.c:1844:17: warning: 'diob.d_mem' may be used uninitialized in
this function
fsstress.c: In function 'dread_f':
fsstress.c:1750:17: warning: 'diob.d_miniosz' may be used uninitialized
in this function
fsstress.c:1750:17: warning: 'diob.d_maxiosz' may be used uninitialized
in this function
fsstress.c:1750:17: warning: 'diob.d_mem' may be used uninitialized in
this function
I hacked a couple of changes but I need to check them before
mailing to the ltp-list:
From: Adrian Hunter
Date: Wed, 1 Jun 2011 13:01:48 +0300
Subject: [PATCH] fsstress: quick fix for compile errors
Signed-off-by: Adrian Hunter
---
testcases/kernel/fs/fsstress/fsstress.c |2 ++
testcases/kernel/fs/fsstress/global.h |1 +
2 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/testcases/kernel/fs/fsstress/fsstress.c
b/testcases/kernel/fs/fsstress/fsstress.c
index e3b48ea..83c23ed 100644
--- a/testcases/kernel/fs/fsstress/fsstress.c
+++ b/testcases/kernel/fs/fsstress/fsstress.c
@@ -1757,6 +1757,7 @@ dread_f(int opno, long r)
struct stat64stb;
intv;
+memset(&diob, 0, sizeof(struct dioattr));
init_pathname(&f);
if (!get_fname(FT_REGFILE, r, &f, NULL, NULL, &v)) {
if (v)
@@ -1851,6 +1852,7 @@ dwrite_f(int opno, long r)
struct stat64stb;
intv;
+memset(&diob, 0, sizeof(struct dioattr));
init_pathname(&f);
if (!get_fname(FT_REGFILE, r, &f, NULL, NULL, &v)) {
if (v)
diff --git a/testcases/kernel/fs/fsstress/global.h
b/testcases/kernel/fs/fsstress/global.h
index f788395..5ab5d56 100644
--- a/testcases/kernel/fs/fsstress/global.h
+++ b/testcases/kernel/fs/fsstress/global.h
@@ -58,6 +58,7 @@
#include
#include
#include
+#include
#ifndef O_DIRECT
#define O_DIRECT 04
--
1.7.4.4
(But no warning or hang observed, on top of 3.0-rc1 + cmason/for-linus)
I will try it tonight.
No improvement on 3.0-rc1+ (commit
5c6cce92bc8aee751aafe82c5d9caf7553226a3d).
Logs follow:
Warnings
[ 2857.023360] WARNING: at fs/btrfs/extent-tree.c:5648
btrfs_alloc_free_block+0x14e/0x357 [btrfs]()
[ 2857.023364] Hardware name: XPS 8300
[ 2857.023367] Modules linked in: tun btrfs zlib_deflate libcrc32c brd
fuse cpufreq_ondemand acpi_cpufreq freq_table mperf ip6t_REJECT
nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipv6 uinput
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec
snd_hwdep snd_seq snd_seq_device broadcom snd_pcm snd_timer snd tg3
iTCO_wdt serio_raw dcdbas iTCO_vendor_support microcode soundcore pcspkr
snd_page_alloc i2c_i801 joydev usb_storage i915 drm_kms_helper drm
i2c_algo_bit i2c_core video [last unloaded: scsi_wait_scan]
[ 2857.023431] Pid: 8809, comm: btrfs-endio-wri Not tainted
3.0.0-rc1-work-2011-06-01-01+ #11
[ 2857.023435] Call Trace:
[ 2857.023461] [] warn_slowpath_common+0x85/0x9d
[ 2857.023471] [] warn_slowpath_null+0x1a/0x1c
[ 2857.023494] [] btrfs_alloc_free_block+0x14e/0x357
[btrfs]
[ 2857.023526] [] ?
map_private_extent_buffer+0xb1/0xd5 [btrfs]
[ 2857.023547] [] __btrfs_cow_block+0x102/0x31e [btrfs]
[ 2857.023565] [] ? unlock_up+0xd9/0xe4 [btrfs]
[ 2857.023585] [] btrfs_cow_block+0x104/0x14e [btrfs]
[ 2857.023604] [] btrfs_search_slot+0x162/0x502 [btrfs]
[ 2857.023625] [] btrf
Re: btrfs hang on brd
On 01/06/11 13:07, Adrian Hunter wrote: On 01/06/11 11:54, David Sterba wrote: On Tue, May 31, 2011 at 10:03:12AM +0300, Adrian Hunter wrote: Hi I seem to be able to get btrfs reproducibly to produce warnings and finally hang when running a stress test on a ramdisk. Testing was done using the "integration-test" branch of btrfs-unstable. Note that I also tested v2.6.39 and "integration-test" took much longer to hang i.e. it is an improvement The test script and stack dumps are below. Is this a valid test? Is it worth me investigating these? I've tried to reproduce myself, but the fsstress utility (taken from latest LTP suite) crashes sometimes and I cannot take it as a proper reproduction. Can you point me to the exact version you used? The LTP version does not compile properly: make[4]: Entering directory `/home/ahunter/Desktop/Projects/ltp/ltp-full-20110228/testcases/kernel/fs/fsstress' gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -DNO_XFS -I/home/ahunter/Desktop/Projects/ltp/ltp-full-20110228/testcases/kernel/fs/fsstress -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -Wno-error -I../../../../include -I../../../../include -L../../../../lib fsstress.c -o fsstress fsstress.c: In function 'dread_f': fsstress.c:1829:2: warning: implicit declaration of function 'memalign' fsstress.c:1829:6: warning: assignment makes pointer from integer without a cast fsstress.c: In function 'dwrite_f': fsstress.c:1912:6: warning: assignment makes pointer from integer without a cast fsstress.c:1844:17: warning: 'diob.d_miniosz' may be used uninitialized in this function fsstress.c:1844:17: warning: 'diob.d_maxiosz' may be used uninitialized in this function fsstress.c:1844:17: warning: 'diob.d_mem' may be used uninitialized in this function fsstress.c: In function 'dread_f': fsstress.c:1750:17: warning: 'diob.d_miniosz' may be used uninitialized in this function fsstress.c:1750:17: warning: 'diob.d_maxiosz' may be used uninitialized in this function fsstress.c:1750:17: warning: 'diob.d_mem' may be used uninitialized in this function I hacked a couple of changes but I need to check them before mailing to the ltp-list: In fact there is already a fix here: http://sourceforge.net/mailarchive/message.php?msg_id=27212868 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs hang on brd
On 01/06/11 11:54, David Sterba wrote:
On Tue, May 31, 2011 at 10:03:12AM +0300, Adrian Hunter wrote:
Hi
I seem to be able to get btrfs reproducibly to
produce warnings and finally hang when running
a stress test on a ramdisk.
Testing was done using the "integration-test"
branch of btrfs-unstable. Note that I also tested
v2.6.39 and "integration-test" took much longer to
hang i.e. it is an improvement
The test script and stack dumps are below.
Is this a valid test?
Is it worth me investigating these?
I've tried to reproduce myself, but the fsstress utility (taken from
latest LTP suite) crashes sometimes and I cannot take it as a proper
reproduction. Can you point me to the exact version you used?
The LTP version does not compile properly:
make[4]: Entering directory
`/home/ahunter/Desktop/Projects/ltp/ltp-full-20110228/testcases/kernel/fs/fsstress'
gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -DNO_XFS
-I/home/ahunter/Desktop/Projects/ltp/ltp-full-20110228/testcases/kernel/fs/fsstress
-D_LARGEFILE64_SOURCE -D_GNU_SOURCE -Wno-error -I../../../../include
-I../../../../include -L../../../../lib fsstress.c -o fsstress
fsstress.c: In function 'dread_f':
fsstress.c:1829:2: warning: implicit declaration of function 'memalign'
fsstress.c:1829:6: warning: assignment makes pointer from integer
without a cast
fsstress.c: In function 'dwrite_f':
fsstress.c:1912:6: warning: assignment makes pointer from integer
without a cast
fsstress.c:1844:17: warning: 'diob.d_miniosz' may be used uninitialized
in this function
fsstress.c:1844:17: warning: 'diob.d_maxiosz' may be used uninitialized
in this function
fsstress.c:1844:17: warning: 'diob.d_mem' may be used uninitialized in
this function
fsstress.c: In function 'dread_f':
fsstress.c:1750:17: warning: 'diob.d_miniosz' may be used uninitialized
in this function
fsstress.c:1750:17: warning: 'diob.d_maxiosz' may be used uninitialized
in this function
fsstress.c:1750:17: warning: 'diob.d_mem' may be used uninitialized in
this function
I hacked a couple of changes but I need to check them before
mailing to the ltp-list:
From: Adrian Hunter
Date: Wed, 1 Jun 2011 13:01:48 +0300
Subject: [PATCH] fsstress: quick fix for compile errors
Signed-off-by: Adrian Hunter
---
testcases/kernel/fs/fsstress/fsstress.c |2 ++
testcases/kernel/fs/fsstress/global.h |1 +
2 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/testcases/kernel/fs/fsstress/fsstress.c
b/testcases/kernel/fs/fsstress/fsstress.c
index e3b48ea..83c23ed 100644
--- a/testcases/kernel/fs/fsstress/fsstress.c
+++ b/testcases/kernel/fs/fsstress/fsstress.c
@@ -1757,6 +1757,7 @@ dread_f(int opno, long r)
struct stat64 stb;
int v;
+ memset(&diob, 0, sizeof(struct dioattr));
init_pathname(&f);
if (!get_fname(FT_REGFILE, r, &f, NULL, NULL, &v)) {
if (v)
@@ -1851,6 +1852,7 @@ dwrite_f(int opno, long r)
struct stat64 stb;
int v;
+ memset(&diob, 0, sizeof(struct dioattr));
init_pathname(&f);
if (!get_fname(FT_REGFILE, r, &f, NULL, NULL, &v)) {
if (v)
diff --git a/testcases/kernel/fs/fsstress/global.h
b/testcases/kernel/fs/fsstress/global.h
index f788395..5ab5d56 100644
--- a/testcases/kernel/fs/fsstress/global.h
+++ b/testcases/kernel/fs/fsstress/global.h
@@ -58,6 +58,7 @@
#include
#include
#include
+#include
#ifndef O_DIRECT
#define O_DIRECT 04
--
1.7.4.4
(But no warning or hang observed, on top of 3.0-rc1 + cmason/for-linus)
I will try it tonight.
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: btrfs hang on brd
On Tue, May 31, 2011 at 10:03:12AM +0300, Adrian Hunter wrote:
> Hi
>
> I seem to be able to get btrfs reproducibly to
> produce warnings and finally hang when running
> a stress test on a ramdisk.
>
> Testing was done using the "integration-test"
> branch of btrfs-unstable. Note that I also tested
> v2.6.39 and "integration-test" took much longer to
> hang i.e. it is an improvement
>
> The test script and stack dumps are below.
>
> Is this a valid test?
>
> Is it worth me investigating these?
I've tried to reproduce myself, but the fsstress utility (taken from
latest LTP suite) crashes sometimes and I cannot take it as a proper
reproduction. Can you point me to the exact version you used?
(But no warning or hang observed, on top of 3.0-rc1 + cmason/for-linus)
> Test
>
>
> #!/bin/sh
>
> sudo modprobe brd rd_size=262144
this is minimal size possible, 256MB
>
> sudo umount /mnt/test/ 2> /dev/null
>
> echo 'mkfs.btrfs /dev/ram0'
>
> sudo mkfs.btrfs /dev/ram0
>
> sudo mkdir -p /mnt/test
>
> echo 'mount -t btrfs /dev/ram0 /mnt/test'
>
> sudo mount -t btrfs /dev/ram0 /mnt/test
>
> sudo mkdir -p /mnt/test/test
>
> sudo chown $USER /mnt/test/test
> sudo chgrp $USER /mnt/test/test
>
> sudo umount /mnt/test
>
> full=0
> i=0
> while true; do
> sudo mount -t btrfs /dev/ram0 /mnt/test
>
> if df | grep ram0 | grep 100% > /dev/null; then
> full=`expr $full \+ 1`
> if test $full -gt 6;then
> rm -rf /mnt/test/test/*
> full=0
> fi
> else
> full=0
> fi
>
> fsstress -c -r -d /mnt/test/test -p 3 -n 1000 -l 10
>
> sudo umount /mnt/test
>
> i=`expr $i \+ 1`
> echo $i
> done
>
>
>
> Stack dumps for warnings
>
>
>
> [ 7481.520750] WARNING: at fs/btrfs/extent-tree.c:5648
5644 ret = block_rsv_use_bytes(block_rsv, blocksize);
5645 if (!ret)
5646 return block_rsv;
5647 if (ret) {
5648 WARN_ON(1);
5649 ret = reserve_metadata_bytes(trans, root, block_rsv,
blocksize,
5650 0);
and block_rsv_use_bytes() returns nonzero in case of ENOSPC.
> [ 7481.521176] WARNING: at fs/btrfs/extent-tree.c:5648
> btrfs_alloc_free_block+0x14e/0x357 [btrfs]()
> [ 7481.521178] Hardware name: XPS 8300
> [ 7481.521180] Modules linked in: tcp_lp tun btrfs zlib_deflate
> libcrc32c brd fuse cpufreq_ondemand acpi_cpufreq freq_table mperf
> ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter
> ip6_tables ipv6 uinput snd_hda_codec_hdmi snd_hda_codec_realtek
> snd_hda_intel snd_hda_codec broadcom tg3 snd_hwdep snd_seq
> snd_seq_device snd_pcm joydev pcspkr iTCO_wdt iTCO_vendor_support
> dcdbas serio_raw i2c_i801 snd_timer snd microcode soundcore
> snd_page_alloc usb_storage i915 drm_kms_helper drm i2c_algo_bit
> i2c_core video [last unloaded: scsi_wait_scan]
> [ 7481.521237] Pid: 3980, comm: btrfs-endio-wri Tainted: GW
> 2.6.39-integration-test-20110526-01+ #2
> [ 7481.521240] Call Trace:
> [ 7481.521245] [] warn_slowpath_common+0x85/0x9d
> [ 7481.521250] [] warn_slowpath_null+0x1a/0x1c
> [ 7481.521288] [] btrfs_alloc_free_block+0x14e/0x357
> [btrfs]
> [ 7481.521303] [] ? map_private_extent_buffer+0xb1/0xd5
> [btrfs]
> [ 7481.521313] [] __btrfs_cow_block+0x102/0x31e [btrfs]
> [ 7481.521322] [] ? btrfs_set_item_key+0x3/0x20 [btrfs]
> [ 7481.521341] [] btrfs_cow_block+0x104/0x14d [btrfs]
> [ 7481.521353] [] btrfs_search_slot+0x162/0x502 [btrfs]
> [ 7481.521378] [] btrfs_lookup_file_extent+0x3c/0x3e
> [btrfs]
> [ 7481.521388] [] ? btrfs_alloc_path+0x1a/0x2b [btrfs]
> [ 7481.521405] [] btrfs_drop_extents+0x10e/0x731 [btrfs]
> [ 7481.521410] [] ? need_resched+0x23/0x2d
> [ 7481.521415] [] ? _cond_resched+0xe/0x22
> [ 7481.521420] [] ? slab_pre_alloc_hook.clone.32+0x2d/0x31
> [ 7481.521426] [] ? kmem_cache_alloc+0x29/0xf7
> [ 7481.521441] []
> insert_reserved_file_extent.clone.34+0x70/0x1fc [btrfs]
> [ 7481.521470] [] ? lock_extent_bits+0x5e/0xa8 [btrfs]
> [ 7481.521496] [] btrfs_endio_direct_write+0x171/0x29a
> [btrfs]
> [ 7481.521511] [] ? end_workqueue_fn+0xf6/0x10e [btrfs]
> [ 7481.521516] [] bio_endio+0x2d/0x2f
> [ 7481.521539] [] end_workqueue_fn+0x101/0x10e [btrfs]
> [ 7481.521565] [] worker_loop+0x193/0x4ca [btrfs]
> [ 7481.521581] [] ? btrfs_queue_worker+0x214/0x214 [btrfs]
> [ 7481.521586] [] kthread+0x82/0x8a
> [ 7481.521591] [] kernel_thread_helper+0x4/0x10
> [ 7481.521596] [] ? kthread_worker_fn+0x14b/0x14b
> [ 7481.521601] [] ? gs_change+0x13/0x13
> [ 7481.521604] ---[ end trace abb147a5624a0a25 ]---
> [ 7481.521639] [ cut here ]
>
> Stack dumps for more warnings
> --
>
> [21983.399906] WARNING: at fs/btrfs/extent-tree.c:3832
3829 static void release_global_block_rsv(struct btrfs_fs_info *fs_info)
3830 {
3831 block_rsv_re
