Excerpts from Smets, Jan (Jan)'s message of 2010-11-19 02:21:21 -0500: > Hi list > > This happened when running an iozone test over ceph, it was doing lots of random reads. > > I have no idea how to properly interpret this, I should find it out. Let me know if you need something else. > > Thanks! > > > > [69003.803272] ------------[ cut here ]------------ > [69003.807987] kernel BUG at fs/btrfs/inode.c:6230! > [69003.807987] invalid opcode: 0000 [#1] SMP > [69003.807987] last sysfs file: /sys/module/btrfs/initstate > [69003.807987] CPU 0 > [69003.807987] Modules linked in: nfs lockd fscache nfs_acl auth_rpcgss sunrpc bonding loop evdev radeon ttm snd_pcm snd_timer drm_kms_helper snd drm i2c_algo_bit i2c_i801 soundcore snd_page_alloc i2c_core i3200_edac e1000e shpchp pci_hotplug edac_core it8213 pcspkr ide_core serio_raw ext4 mbcache jbd2 crc16 btrfs zlib_deflate sd_mod crc_t10dif ata_generic ata_piix libata scsi_mod > [69003.807987] > [69003.807987] Pid: 1666, comm: cosd Not tainted 2.6.37-rc1+ #1 X7SBi-LN4/X7SBi-LN4 > [69003.807987] RIP: 0010:[<ffffffffa015250e>] [<ffffffffa015250e>] btrfs_truncate+0x447/0x47c [btrfs] > [69003.807987] RSP: 0018:ffff880127723d68 EFLAGS: 00010286 > [69003.807987] RAX: 00000000ffffffe4 RBX: ffff880127b11848 RCX: ffff88012bab8bd0 This is a BUG_ON in btrfs_truncate for any errors from btrfs_update_inode. Looking at the registers, btrfs_update_inode returned 00000000ffffffe4, which is -ENOSPC. Which is good, because the other choice would have been ENOENT, which would be much harder to find. So we need to tweak the reservations a little in btrfs_truncate(). Thanks for this report! -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
