On Tue, Aug 05, 2014 at 10:34:13AM +0100, Peter Waller wrote: > I already posted this in the thread "ENOSPC with mkdir and rename", > but now I have a device with 100GB unallocated on the "btrfs fi sh" > output, and when I run a rebalance of the form: > > > btrfs filesystem balance start -dusage=50 -musage=10 "$mount" > > I get more than 75 of such stack traces contaminating the klog. I've > put some of them up in a gist here: > https://gist.github.com/pwaller/1df8a7efc2f10343f2e3 and one of them > is reproduced below. > > Is this harmful or expected? Are there any workarounds?
It's a warning, not an oops, so it's less immediately dangerous. The other key thing is "block rsv returned -28", which says it's an ENOSPC. My guess would be that you've got ENOSPC debugging enabled in the kernel, and that the backtraces, while scary, are essentially harmless (if irritating). Hugo. > Thanks, > > - Peter > > [376007.681938] ------------[ cut here ]------------ > [376007.681957] WARNING: CPU: 1 PID: 27021 at > /home/apw/COD/linux/fs/btrfs/ > extent-tree.c:6946 > use_block_rsv+0xfd/0x1a0 [btrfs]() > [376007.681958] BTRFS: block rsv returned -28 > [376007.681959] Modules linked in: softdog tcp_diag inet_diag dm_crypt > ppdev xen_fbfront fb_sys_fops syscopyarea sysfillrect sysimgblt > i2c_piix4 serio_raw parport_pc parport mac_hid isofs xt_tcpudp > iptable_filter xt_owner ip_tables x_tables btrfs xor raid6_pq > crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel > aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd floppy psmouse > [376007.681980] CPU: 1 PID: 27021 Comm: pam_script_ses_ Tainted: G > W 3.15.7-031507-generic #201407281235 > [376007.681981] Hardware name: Xen HVM domU, BIOS 4.2.amazon 05/23/2014 > [376007.681983] 0000000000001b22 ffff8800acca39d8 ffffffff8176f115 > 0000000000000007 > [376007.681986] ffff8800acca3a28 ffff8800acca3a18 ffffffff8106ceac > ffff8801efc37870 > [376007.681989] ffff88017db0ff00 ffff8801aedcd800 0000000000001000 > ffff88001c987000 > [376007.681992] Call Trace: > [376007.682000] [<ffffffff8176f115>] dump_stack+0x46/0x58 > [376007.682005] [<ffffffff8106ceac>] warn_slowpath_common+0x8c/0xc0 > [376007.682008] [<ffffffff8106cf96>] warn_slowpath_fmt+0x46/0x50 > [376007.682016] [<ffffffffa00d9d1d>] use_block_rsv+0xfd/0x1a0 [btrfs] > [376007.682024] [<ffffffffa00de687>] btrfs_alloc_free_block+0x57/0x220 > [btrfs] > [376007.682027] [<ffffffff8178033c>] ? __do_page_fault+0x28c/0x550 > [376007.682031] [<ffffffff8119749f>] ? page_add_file_rmap+0x6f/0xb0 > [376007.682037] [<ffffffffa00c8a3c>] btrfs_copy_root+0xfc/0x2b0 [btrfs] > [376007.682041] [<ffffffff811c60b9>] ? memcg_check_events+0x29/0x50 > [376007.682051] [<ffffffffa013a583>] ? create_reloc_root+0x33/0x2c0 [btrfs] > [376007.682061] [<ffffffffa013a743>] create_reloc_root+0x1f3/0x2c0 [btrfs] > [376007.682064] [<ffffffff811dd073>] ? generic_permission+0xf3/0x120 > [376007.682073] [<ffffffffa0140eb8>] btrfs_init_reloc_root+0xb8/0xd0 [btrfs] > [376007.682082] [<ffffffffa00ee967>] > record_root_in_trans.part.30+0x97/0x100 [btrfs] > [376007.682090] [<ffffffffa00ee9f4>] record_root_in_trans+0x24/0x30 [btrfs] > [376007.682098] [<ffffffffa00efeb1>] > btrfs_record_root_in_trans+0x51/0x80 [btrfs] > [376007.682106] [<ffffffffa00f13d6>] > start_transaction.part.35+0x86/0x560 [btrfs] > [376007.682109] [<ffffffff8132c197>] ? apparmor_capable+0x27/0x80 > [376007.682117] [<ffffffffa00f18d9>] start_transaction+0x29/0x30 [btrfs] > [376007.682125] [<ffffffffa00f19a7>] btrfs_join_transaction+0x17/0x20 [btrfs] > [376007.682133] [<ffffffffa00f7fa8>] btrfs_dirty_inode+0x58/0xe0 [btrfs] > [376007.682141] [<ffffffffa00fcaf2>] btrfs_setattr+0xa2/0xf0 [btrfs] > [376007.682144] [<ffffffff811eec74>] notify_change+0x1c4/0x3b0 > [376007.682146] [<ffffffff811dde96>] ? final_putname+0x26/0x50 > [376007.682149] [<ffffffff811d088d>] chown_common+0x16d/0x1a0 > [376007.682153] [<ffffffff811f2b08>] ? __mnt_want_write+0x58/0x70 > [376007.682156] [<ffffffff811d1a8f>] SyS_fchownat+0xbf/0x100 > [376007.682159] [<ffffffff811d1aed>] SyS_chown+0x1d/0x20 > [376007.682163] [<ffffffff817858bf>] tracesys+0xe1/0xe6 > [376007.682165] ---[ end trace 1853311c87a5cd94 ]--- > -- > 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 -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- UNIX: Italian pen maker ---
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