Re: WARN splat fs/btrfs/qgroup.c

From: Qu Wenruo <quwenruo@cn.fujitsu.com>
To: Davidlohr Bueso <dave@stgolabs.net>, <linux-btrfs@vger.kernel.org>
Subject: Re: WARN splat fs/btrfs/qgroup.c
Date: Mon, 3 Apr 2017 08:54:05 +0800	[thread overview]
Message-ID: <4d359a24-f87c-0f3d-942f-006a008c0aed@cn.fujitsu.com> (raw)
In-Reply-To: <20170331145104.GA2270@linux-80c1.suse>

Known bug if you enable qgroup while there is still buffered data.

Patch already sent while not merged yet.
https://patchwork.kernel.org/patch/9619971/

Thanks,
Qu

At 03/31/2017 10:51 PM, Davidlohr Bueso wrote:
> Hi,
>
> While doing a regular kernel build I triggered the following splat
> on a vanilla v4.11-rc4 kernel.
>
> [73253.814880] WARNING: CPU: 20 PID: 631 at fs/btrfs/qgroup.c:2472
> btrfs_qgroup_free_refroot+0x154/0x180 [btrfs]
> [73253.814880] Modules linked in: st(E) sr_mod(E) cdrom(E) nfsv3(E)
> nfs_acl(E) rpcsec_gss_krb5(E) auth_rpcgss(E) nfsv4(E) dns_resolver(E)
> nfs(E) lockd(E) grace(E) fscache(E) ebtable_filter(E) ebtables(E)
> ip6table_filter(E) ip6_tables(E) iptable_filter(E) ip_tables(E)
> x_tables(E) af_packet(E) iscsi_ibft(E) iscsi_boot_sysfs(E) msr(E)
> ext4(E) crc16(E) jbd2(E) mbcache(E) intel_rapl(E) sb_edac(E)
> edac_core(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) coretemp(E)
> kvm_intel(E) kvm(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E)
> igb(E) ghash_clmulni_intel(E) iTCO_wdt(E) joydev(E) pcbc(E)
> aesni_intel(E) ipmi_ssif(E) aes_x86_64(E) ptp(E) iTCO_vendor_support(E)
> crypto_simd(E) glue_helper(E) pps_core(E) lpc_ich(E) ioatdma(E)
> pcspkr(E) dca(E) mfd_core(E) cryptd(E) i2c_i801(E) ipmi_si(E)
> ipmi_devintf(E) ipmi_msghandler(E)
> [73253.814893]  wmi(E) shpchp(E) button(E) sunrpc(E) btrfs(E)
> hid_generic(E) xor(E) usbhid(E) raid6_pq(E) sd_mod(E) mgag200(E)
> i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E)
> sysimgblt(E) fb_sys_fops(E) ttm(E) isci(E) ehci_pci(E) ahci(E)
> ehci_hcd(E) libsas(E) crc32c_intel(E) scsi_transport_sas(E) libahci(E)
> drm(E) usbcore(E) libata(E) sg(E) dm_multipath(E) dm_mod(E)
> scsi_dh_rdac(E) scsi_dh_emc(E) scsi_dh_alua(E) scsi_mod(E) autofs4(E)
> [73253.814901] CPU: 20 PID: 631 Comm: btrfs-transacti Tainted: G
> W   E   4.11.0-rc4-92.11-default+ #2
> [73253.814901] Hardware name: Intel Corporation SandyBridge Platform/To
> be filled by O.E.M., BIOS RMLCRB.86I.R1.25.D670.1303141058 03/14/2013
> [73253.814902] Call Trace:
> [73253.814903]  dump_stack+0x63/0x87
> [73253.814905]  __warn+0xd1/0xf0
> [73253.814906]  warn_slowpath_null+0x1d/0x20
> [73253.814915]  btrfs_qgroup_free_refroot+0x154/0x180 [btrfs]
> [73253.814923]  __btrfs_run_delayed_refs.constprop.73+0x309/0x1300 [btrfs]
> [73253.814932]  btrfs_run_delayed_refs+0x7e/0x2e0 [btrfs]
> [73253.814941]  btrfs_commit_transaction+0x39/0x950 [btrfs]
> [73253.814948]  ? start_transaction+0xaa/0x490 [btrfs]
> [73253.814956]  transaction_kthread+0x18a/0x1c0 [btrfs]
> [73253.814958]  kthread+0x101/0x140
> [73253.814965]  ? btrfs_cleanup_transaction+0x4f0/0x4f0 [btrfs]
> [73253.814966]  ? kthread_park+0x90/0x90
> [73253.814967]  ret_from_fork+0x2c/0x40
>
> Any ideas?
>
> Thanks,
> Davidlohr
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