Comment 0 for bug 1810384

Test failed with disk quota exceeded when trying to create subvolume, and error traces could be found in the kernel log:

Invoking test 6113077cd319e747875ec71227d2b5cb54e08c76

fix 6113077cd319e747875ec71227d2b5cb54e08c76

    Btrfs: fix missing qgroup reservation before fallocating

    Steps to reproduce:
        mkfs.btrfs <disk>
        mount <disk> <mnt>
        btrfs quota enable <mnt>
        btrfs sub create <mnt>/subv
        btrfs qgroup limit 10M <mnt>/subv
        fallocate --length 20M <mnt>/subv/data

    For the above example, fallocating will return successfully which
    is not expected, we try to fix it by doing qgroup reservation before
    fallocating.

Create subvolume '/tmp/mnt-6113077cd319e747875ec71227d2b5cb54e08c76/subv'
fallocate: fallocate failed: Disk quota exceeded

Found kernel issue:

[ 829.940603] Invoking test 6113077cd319e747875ec71227d2b5cb54e08c76
[ 830.001738] BTRFS: device fsid 134f6701-7984-42bc-affc-e423f4e6c750 devid 1 transid 5 /dev/loop0
[ 830.005573] BTRFS info (device loop0): disk space caching is enabled
[ 830.005574] BTRFS info (device loop0): has skinny extents
[ 830.005575] BTRFS info (device loop0): flagging fs with big metadata feature
[ 830.006375] BTRFS info (device loop0): creating UUID tree
[ 830.038054] BTRFS info (device loop0): qgroup scan completed (inconsistency flag cleared)
[ 830.042133] WARNING: CPU: 1 PID: 15933 at /build/linux-oem-RkS9Vy/linux-oem-4.15.0/fs/btrfs/extent-tree.c:4433 btrfs_free_reserved_data_space_noquota+0xcb/0xe0 [btrfs]
[ 830.042133] Modules linked in: btrfs zstd_compress intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass ppdev input_leds intel_cstate joydev intel_rapl_perf intel_pch_thermal parport_pc ipmi_si parport lpc_ich mac_hid ipmi_devintf ipmi_msghandler sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear i915 mgag200 crct10dif_pclmul crc32_pclmul ttm ghash_clmulni_intel pcbc igb drm_kms_helper hid_generic aesni_intel dca syscopyarea i2c_algo_bit sysfillrect aes_x86_64 sysimgblt fb_sys_fops crypto_simd ptp ahci usbhid glue_helper cryptd drm libahci hid pps_core video [last unloaded: zstd_compress]
[ 830.042166] CPU: 1 PID: 15933 Comm: fallocate Not tainted 4.15.0-1030-oem #35-Ubuntu
[ 830.042167] Hardware name: Intel Corporation S1200RP/S1200RP, BIOS S1200RP.86B.03.02.0003.070120151022 07/01/2015
[ 830.042176] RIP: 0010:btrfs_free_reserved_data_space_noquota+0xcb/0xe0 [btrfs]
[ 830.042177] RSP: 0018:ffffaa474a647d88 EFLAGS: 00010287
[ 830.042178] RAX: 0000000000000000 RBX: 0000000001400000 RCX: 0000000001400000
[ 830.042178] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8febd2814200
[ 830.042179] RBP: ffffaa474a647db0 R08: 0000000000027fc0 R09: ffffffffc0877688
[ 830.042180] R10: ffff8feb877f0000 R11: 0000000000000001 R12: ffff8febd2814200
[ 830.042180] R13: ffff8feb877f0000 R14: ffff8feb1ff25f40 R15: 0000000001400000
[ 830.042181] FS: 00007f7b7a10c540(0000) GS:ffff8febe0840000(0000) knlGS:0000000000000000
[ 830.042182] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 830.042183] CR2: 00007f7b79f4baa0 CR3: 000000045a996004 CR4: 00000000003606e0
[ 830.042184] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 830.042184] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 830.042185] Call Trace:
[ 830.042194] btrfs_free_reserved_data_space+0x50/0x70 [btrfs]
[ 830.042205] btrfs_fallocate+0x3f8/0x750 [btrfs]
[ 830.042208] vfs_fallocate+0x144/0x260
[ 830.042209] SyS_fallocate+0x48/0x80
[ 830.042211] do_syscall_64+0x73/0x130
[ 830.042214] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[ 830.042215] RIP: 0033:0x7f7b79c13857
[ 830.042215] RSP: 002b:00007ffc1ad01498 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
[ 830.042216] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7b79c13857
[ 830.042217] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
[ 830.042217] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
[ 830.042218] R10: 0000000001400000 R11: 0000000000000246 R12: 00007ffc1ad016c8
[ 830.042219] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000001400000
[ 830.042219] Code: c7 49 8b 7f 08 49 83 c7 18 45 31 c9 49 89 d8 4c 89 f1 48 c7 c2 d5 5a 8e c0 4c 89 ee e8 6f 88 7c fc 4d 8b 17 4d 85 d2 75 d8 eb 97 <0f> 0b 49 c7 44 24 28 00 00 00 00 eb 85 0f 1f 84 00 00 00 00 00
[ 830.042240] ---[ end trace 4a601597480dd14c ]---
[ 830.208479] Test 6113077cd319e747875ec71227d2b5cb54e08c76 returned 0

FAIL: 6113077cd319e747875ec71227d2b5cb54e08c76 (ret=1)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-43-generic 4.15.0-43.46
ProcVersionSignature: User Name 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Dec 31 02:11 seq
 crw-rw---- 1 root audio 116, 33 Dec 31 02:11 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Thu Jan 3 08:14:38 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
PciMultimedia:

ProcFB: 0 cirrusdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic root=UUID=2f68c627-8ab4-40d5-8c06-6563436d0f96 ro console=ttyS0,115200n8
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-43-generic N/A
 linux-backports-modules-4.15.0-43-generic N/A
 linux-firmware 1.173.2
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-xenial
dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-xenial
dmi.sys.vendor: QEMU