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List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Stuck subvolume removal: To: Qu Wenruo , linux-btrfs@vger.kernel.org References: <1c371732-db4f-49ad-bc00-876b3be0fe98@gmx.com> <4b4fc981-912d-40cd-945b-d4acf14198e1@gmx.com> <01f8b560-fb57-4861-8382-141c39655478@gmx.com> <0ed6fdf0-842a-4641-90e4-5239b5049e4b@gmx.com> Content-Language: en-US From: Paul Graff In-Reply-To: <0ed6fdf0-842a-4641-90e4-5239b5049e4b@gmx.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:AqWvL5uBkWFwMw68lZqvnmq9UbTDlVRR/K8Vivjtv7WrYlPXjnr i8YCqkYlEeSH4X3hjxeCMddlaS4FOK7B+B9skM6z10qxJdNRtCG/BVfv8L7ZgHcFifXsFLn 935XVl1SIf2AxhjBW0Y95lYaUSjhWFgrk6KousA+mlTv+i8IChIOx2rM+HhIgIp9Yi5Satf VERurho4kcrtsWzMBKt1A== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:3cbTcmwhZq4=;arKKFbwTU/3rYM1IysQMEqpVBaO SQHdzurpYCCQp0KzTMm0+u8WUNFrSIpREAL6Fi6vfSSfVcjvgo68ywQjHGShXciZRgZR/Nn9Z 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aRjs5AWy0KY+cqM8Y9sRWbay2/ikl4tnEbCybiBXZj3K9BzjL0wIxd6Kbi+wjCzELTV6DDrMQ bJCuvJdS9S6wMCxkzyeZW90kPZIGN1doQbqNxW8Kclj6SLx6l9/TCzrSLCGt1UfYO8TdUFqpp UU4GLrP8x2mFTr9iNjEyJOOg9dROy1gy73BOtqtsUrqXTlF7QxXxCJWcnHVahB57MlWEv12Pb 3Ll0esuWc/9UBNCm9+qrYDapwqb9AlV5rEA5nt5+yzCX+6VuulP3oVyvCjyLg+zrwnq7iMgSV dgepkgDjZEJed4jnvI0zGhvhkteYxhRJub5alQaSQ9MKCQk6dv07jllTjMKGUV1tOtchrUT82 4U0B7lBZWjVXbo2KQydtO3Z5GG8TZgcmngI3GAV2GMA332zu7iwc32ZQde2lcaQau355enjJL MHHnTwaIHBWbRTlwADlyT0dckcUB+6+ubfonjU9buDOga6hthSA== On 11/14/25 1:55 PM, Qu Wenruo wrote: > > > =E5=9C=A8 2025/11/15 06:08, Paul Graff =E5=86=99=E9=81=93: >> >> >> On 11/13/25 4:54 PM, Qu Wenruo wrote: >>> >>> >>> =E5=9C=A8 2025/11/14 09:10, Paul Graff =E5=86=99=E9=81=93: >>>> Hi, currently there is a dropped subvolume error when running a=20 >>>> full balance on a single SSD. >>>> >>>> |:~> sudo btrfs balance start / WARNING: Full balance without=20 >>>> filters requested. This operation is very intense and takes=20 >>>> potentially very long. It is recommended to use the balance filters= =20 >>>> to narrow down the scope of balance. Use 'btrfs balance start=20 >>>> --full-balance' option to skip this warning. The operation will=20 >>>> start in 10 seconds. Use Ctrl-C to stop it. 10 9 8 7 6 5 4 3 2 1=20 >>>> Starting balance without any filters. ERROR: error during balancing= =20 >>>> '/': Structure needs cleaning There may be more info in syslog -=20 >>>> try dmesg | tail hightower- i5-6600k:~> dmesg | tail [38576.407681]= =20 >>>> [ T29728] BTRFS info (device dm-2): found 37170 extents, stage:=20 >>>> update data pointers [38584.873805] [ T29728] BTRFS info (device=20 >>>> dm-2): relocating block group 64891125760 flags data [38607.693519]= =20 >>>> [ T29728] BTRFS info (device dm-2): found 33194 extents, stage:=20 >>>> move data extents [38641.574032] [ T29728] BTRFS info (device=20 >>>> dm-2): found 33194 extents, stage: update data pointers=20 >>>> [38649.812477] [ T29728] BTRFS info (device dm-2): relocating block= =20 >>>> group 62710087680 flags data [38662.710999] [ T29728] BTRFS info=20 >>>> (device dm-2): found 43884 extents, stage: move data extents=20 >>>> [38696.292982] [ T29728] BTRFS info (device dm-2): found 43884=20 >>>> extents, stage: update data pointers [38708.587669] [ T29728] BTRFS= =20 >>>> info (device dm-2): relocating block group 60294168576 flags=20 >>>> metadata|dup [38714.889735] [ T29728] BTRFS error (device dm-2):=20 >>>> cannot relocate partially dropped subvolume 490, drop progress key=20 >>>> (853588 108 0) [38723.736887] [ T29728] BTRFS info (device dm-2):=20 >>>> balance: ended with status: -117 hightower-i5-6600k:~>| >>> >>> The format is a mess. >> My apologies for the disastrous output format above. >>> Please provide a proper formatted dmesg instead. >> >> :~> sudo dmesg | tail >> >> [sudo] password for root: >> >> [44928.672213] [ T96240] BTRFS info (device dm-2): found 55680=20 >> extents, stage: update data pointers >> >> [44937.810972] [ T96240] BTRFS info (device dm-2): found 4 extents,=20 >> stage: update data pointers >> >> [44938.590658] [ T96240] BTRFS info (device dm-2): relocating block=20 >> group 60294168576 flags metadata|dup >> >> [44945.516661] [ T96240] BTRFS error (device dm-2): cannot relocate=20 >> partially dropped subvolume 490, drop progress key (853588 108 0) >> >> [44955.995468] [ T96240] BTRFS info (device dm-2): balance: ended=20 >> with status: -117 >> >> :~> >> >> >>> >>> Along with the kernel version. >> Most current openSUSE Rescue system CD used for btrfs check, uname -a= =20 >> > 6.17.7-1 >>> >>> The relocation is rejected because there is a half-dropped=20 >>> subvolume, which is not that common. >>> It maybe a problem with the fs that there are some ghost subvolumes=20 >>> that are never dropped. >>> >>> There used to be kernel bug that can lead to such ghost subvolumes,=20 >>> IIRC the latest btrfs check can detect it. >>> >>> So please also provide the output of "btrfs check --readonly" of the= =20 >>> unmounted fs. >> >> :~ # btrfs check --readonly --progress /dev/mapper/system-root >> >> Opening filesystem to check... >> >> Checking filesystem on /dev/mapper/system-root >> >> UUID: 605560ad-fe93-4d09-8760-df0725b43ee1 >> >> [1/8] checking log skipped (none written) >> >> [1/7] checking root items (0:00:14 elapsed, 5328460 items checked) >> >> [2/7] checking extents (0:01:01 elapsed, 984830 items checked) >> >> [3/7] checking free space cache (0:00:12 elapsed, 471 items checked) >> >> [4/7] checking fs roots (0:04:32 elapsed, 910644 items checked) >> >> [5/7] checking csums (without verifying data) (0:00:12 elapsed,=20 >> 895024 items checked) >> >> fs tree 490 missing orphan item (0:00:00 elapsed, 94 items checked) > > So indeed your fs has a half dropped ghost subvolume, most likely=20 > caused by some older kernels. > > Unfortunately btrfs-progs doesn't have the ability to repair it yet,=20 > I'll craft a branch of btrfs-progs with the repair ability soon. > > Meanwhile please prepare an environment to compile btrfs-progs. > > Thanks, > Qu Hi, I would like to ask if there is a solution to the "dropped ghost=20 subvolume" the filesystem on machine here exhibits as of yet? -Thanks Paul Graff > >> >> [6/7] checking root refs (0:00:01 elapsed, 94 items checked) >> >> ERROR: errors found in root refs >> >> found 496776130741 bytes used, error(s) found >> >> total csum bytes: 465839608 >> >> total tree bytes: 16133832704 >> >> total fs tree bytes: 14983905280 >> >> total extent tree bytes: 624771072 >> >> btree space waste bytes: 3613129770 >> >> file data blocks allocated: 1062495817728 >> >> referenced 976540409856 >> >> :~ # >> >> >>> >>> Thanks, >>> Qu >>> >> -Greatest Hopes >> Paul >>>> >>>> After passing, >>>> >>>> |:~> sudo btrfs subvolume sync / [sudo] password for root:=20 >>>> hightower- i5-6600k:~> | >>>> >>>> the command returned to prompt very, very quickly. >>>> >>>> A second balance attempt results with the following output: >>>> >>>> |:~> sudo btrfs balance start / WARNING: Full balance without=20 >>>> filters requested. This operation is very intense and takes=20 >>>> potentially very long. It is recommended to use the balance filters= =20 >>>> to narrow down the scope of balance. Use 'btrfs balance start=20 >>>> --full-balance' option to skip this warning. The operation will=20 >>>> start in 10 seconds. Use Ctrl-C to stop it. 10 9 8 7 6 5 4 3 2 1=20 >>>> Starting balance without any filters. ERROR: error during balancing= =20 >>>> '/': Structure needs cleaning There may be more info in syslog -=20 >>>> try dmesg | tail hightower- i5-6600k:~> | >>>> >>>> |:~> dmesg | tail [93689.781162] [ T69656] BTRFS info (device=20 >>>> dm-2): found 16 extents, stage: update data pointers [93690.667290]= =20 >>>> [ T69656] BTRFS info (device dm-2): relocating block group=20 >>>> 1495819878400 flags data [93703.323923] [ T69656] BTRFS info=20 >>>> (device dm-2): found 33 extents, stage: move data extents=20 >>>> [93705.575991] [ T69656] BTRFS info (device dm-2): found 33=20 >>>> extents, stage: update data pointers [93706.769453] [ T69656] BTRFS= =20 >>>> info (device dm-2): relocating block group 1494746136576 flags data= =20 >>>> [93725.570642] [ T69656] BTRFS info (device dm-2): found 39=20 >>>> extents, stage: move data extents [93727.449779] [ T69656] BTRFS=20 >>>> info (device dm-2): found 39 extents, stage: update data pointers=20 >>>> [93728.465650] [ T69656] BTRFS info (device dm-2): relocating block= =20 >>>> group 60294168576 flags metadata|dup [93736.722689] [ T69656] BTRFS= =20 >>>> error (device dm-2): cannot relocate partially dropped subvolume=20 >>>> 490, drop progress key (853588 108 0) [93750.594559] [ T69656]=20 >>>> BTRFS info (device dm-2): balance: ended with status: -117=20 >>>> hightower- i5-6600k:~> | >>>> >>>> Please see the following referenced, prior posting for stuck=20 >>>> subvolume removal similarity. https://lore.kernel.org/linux-=20 >>>> btrfs/9f936d59- d782-1f48-bbb7-dd1c8dae2615@gmail.com/ >>>> >>>> Is there a patch for btrfsprogs? If so can the patch be merged?| >>>> | >>>> >>>> What are your thoughts on this? >>>> >>>> >>>> >>>> >>>> >>> >> >