Re: warn at fs/btrfs/extent-tree.c:5748 __btrfs_free_extent+0x9ce/0xa20

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On 03/11/2014 07:44 PM, Sage Weil wrote:
> Hey,
> 
> Is this something you guys have seen before?  This is from v3.13-rc2.
> 
> kernel: [49432.696440] WARNING: CPU: 3 PID: 26411 at /srv/autobuild-ceph/gitbuilder.git/build/fs/btrfs/extent-tree.c:5748 __btrfs_free_extent+0x9ce/0xa20 [btrfs]()
> kernel: [49432.710128] Modules linked in: arc4(F) md4(F) nls_utf8(F) cifs(F) ufs(F) qnx4(F) hfsplus(F) hfs(F) minix(F) ntfs(F) msdos(F) jfs(F) xfs(F) reiserfs(F) ext2(F) kvm_intel(F) kvm(F) ib_iser(F) rdma_cm(F) ib_cm(F) iw_cm(F) ib_sa(F) ib_mad(F) ib_core(F) ib_addr(F) iscsi_tcp(F) libiscsi_tcp(F) libiscsi(F) psmouse(F) ipmi_si(F) serio_raw(F) gpio_ich(F) joydev(F) dcdbas(F) i7core_edac(F) edac_core(F) ipmi_msghandler(F) mac_hid(F) acpi_power_meter(F) lpc_ich(F) tpm_tis(F) nfsd(F) nfs_acl(F) auth_rpcgss(F) scsi_transport_iscsi(F) nfs(F) fscache(F) lockd(F) lp(F) sunrpc(F) parport(F) hid_generic(F) usbhid(F) hid(F) btrfs(F) raid6_pq(F) mptsas(F) ixgbe(F) mptscsih(F) dca(F) mptbase(F) ptp(F) pps_core(F) scsi_transport_sas(F) xor(F) mdio(F) bnx2(F) libcrc32c(F)
> kernel: [49432.777445] CPU: 3 PID: 26411 Comm: ceph-osd Tainted: GF         I  3.14.0-rc5-ceph-00016-gf31a96a #1
> kernel: [49432.786704] Hardware name: Dell Inc. PowerEdge R410/01V648, BIOS 1.6.3 02/07/2011
> kernel: [49432.794223]  0000000000001674 ffff8800bf1cbac8 ffffffff816e4840 ffff88022726ef90
> kernel: [49432.801700]  0000000000000000 ffff8800bf1cbb08 ffffffff810524ac a800000000b07e50
> kernel: [49432.809176]  ffff880094e74120 0000000000000000 00000000b07c9000 0000000000000000
> kernel: [49432.816653] Call Trace:
> kernel: [49432.819119]  [<ffffffff816e4840>] dump_stack+0x46/0x58
> kernel: [49432.825384]  [<ffffffff810524ac>] warn_slowpath_common+0x8c/0xc0
> kernel: [49432.831413]  [<ffffffff810524fa>] warn_slowpath_null+0x1a/0x20
> kernel: [49432.837284]  [<ffffffffa010b4be>] __btrfs_free_extent+0x9ce/0xa20 [btrfs]
> kernel: [49432.844108]  [<ffffffffa01110b8>] __btrfs_run_delayed_refs+0x428/0x11e0 [btrfs]
> kernel: [49432.851465]  [<ffffffffa0109458>] ? block_rsv_release_bytes+0x108/0x190 [btrfs]
> kernel: [49432.858823]  [<ffffffffa0114066>] btrfs_run_delayed_refs+0x76/0x2a0 [btrfs]
> kernel: [49432.865869]  [<ffffffffa01251ff>] __btrfs_end_transaction+0x26f/0x370 [btrfs]
> kernel: [49432.873044]  [<ffffffffa0125330>] btrfs_end_transaction+0x10/0x20 [btrfs]
> kernel: [49432.879872]  [<ffffffffa01327de>] btrfs_link+0x13e/0x1d0 [btrfs]
> kernel: [49432.885903]  [<ffffffff811b7571>] vfs_link+0x1b1/0x270
> kernel: [49432.891060]  [<ffffffff811b8120>] SyS_linkat+0x210/0x2d0
> kernel: [49432.896394]  [<ffffffff811b81fe>] SyS_link+0x1e/0x20
> kernel: [49432.901380]  [<ffffffff816f7cd6>] system_call_fastpath+0x1a/0x1f
> 
> The full dump is at
> 
> 	https://urldefense.proofpoint.com/v1/url?u=http://tracker.ceph.com/issues/7688&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=cKCbChRKsMpTX8ybrSkonQ%3D%3D%0A&m=5Q0Wl4GGvXb3sw11Xy%2FYQnZbcMlzHHsbegI1uoQnEbE%3D%0A&s=f85b1094d776c10386c681a8a7b31e49f0621bf51829b6e7153095f2335a01c0
> 	https://urldefense.proofpoint.com/v1/url?u=http://tracker.ceph.com/attachments/download/1141/kern.log.gz&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=cKCbChRKsMpTX8ybrSkonQ%3D%3D%0A&m=5Q0Wl4GGvXb3sw11Xy%2FYQnZbcMlzHHsbegI1uoQnEbE%3D%0A&s=dff103270aba751a919e566182a4d9482041f972ac72cb12435814ae75cacf14
> 

Filipe's looking at this Sage, you said it happend on v3.13-rc2 but the
kernel line says 3.14.0-rc5, have you had it happen in both places?  Thanks,

Josef

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