From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 104571] ext4_mb_generate_buddy block bitmap and bg descriptor
inconsistent
Date: Mon, 28 Sep 2015 08:04:48 +0000
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--- Comment #1 from Sander Smeenk ---
Hit by this bug again:
| EXT4-fs error (device vdb): ext4_mb_generate_buddy:757: group 76916,
| block bitmap and bg descriptor inconsistent: 959 vs 957 free
| clusters
| Aborting journal on device vdb-8.
| EXT4-fs (vdb): Remounting filesystem read-only
| ------------[ cut here ]------------
| WARNING: CPU: 0 PID: 5000 at fs/ext4/mballoc.c:758
| ext4_mb_generate_buddy+0x1fa/0x340()
| Modules linked in: btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs
| msdos jfs xfs libcrc32c xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6
| ip6table_filter ip6_tables nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack
| nf_conntrack iptable_filter ip_tables x_tables cirrus ttm drm_kms_helper
| drm kvm_intel kvm ppdev syscopyarea sysfillrect serio_raw pvpanic
| sysimgblt 8250_fintek parport_pc i2c_piix4 mac_hid nfsd auth_rpcgss
| nfs_acl lockd grace sunrpc lp parport autofs4 psmouse floppy pata_acpi
| CPU: 0 PID: 5000 Comm: deluged Not tainted 3.19.8-ckt4 #1
| Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
| ffffffff81ab4fef ffff8800db637858 ffffffff817c3760 ffff88011fc0fdb8
| 0000000000000000 ffff8800db637898 ffffffff8107696a 0000000000000001
| 00000000000003bf ffff8800d98e4000 0000000000008000 ffff8800084c1000
| Call Trace:
| [] dump_stack+0x45/0x57
| [] warn_slowpath_common+0x8a/0xc0
| [] warn_slowpath_null+0x1a/0x20
| [] ext4_mb_generate_buddy+0x1fa/0x340
| [] ext4_mb_init_cache+0x390/0x700
| [] ext4_mb_load_buddy+0x1ad/0x360
| [] ext4_mb_regular_allocator+0x1b7/0x450
| [] ext4_mb_new_blocks+0x401/0x550
| [] ? ext4_find_extent+0x140/0x330
| [] ext4_ext_map_blocks+0x637/0xe50
| [] ext4_map_blocks+0x129/0x570
| [] ext4_writepages+0x582/0xca0
| [] ? get_futex_key+0x1c0/0x2b0
| [] ? __enqueue_entity+0x78/0x80
| [] do_writepages+0x1e/0x30
| [] __filemap_fdatawrite_range+0x59/0x60
| [] filemap_write_and_wait+0x2c/0x60
| [] do_vfs_ioctl+0x3fd/0x4e0
| [] SyS_ioctl+0x81/0xa0
| [] system_call_fastpath+0x16/0x1b
| ---[ end trace 860c733f0437c9b7 ]---
After which the kernel starts logging in rapid succession:
| EXT4-fs error (device vdb): ext4_find_extent:900: inode #84410502:
| comm deluged: pblk 223281469 bad header/extent: invalid magic - magic
| 80da, entries 13942, max 3979(0), depth 42746(0)
| EXT4-fs error: 40 callbacks suppressed
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