xfstests ext4/054 will BUG_ON

[Thadeu Lima de Souza Cascardo]

When running xfstests ext4/054 test, the kernel will BUG_ON. This requires a mangled filesystem (the test uses debugfs, the tool, not the kernel filesystem).

[23967.165615] ------------[ cut here ]------------
[23967.169587] kernel BUG at /build/linux-aws-wwoDm1/linux-aws-4.4.0/fs/ext4/mballoc.c:3222!
[23967.169587] invalid opcode: 0000 [#1] SMP
[23967.169587] Modules linked in: binfmt_misc serio_raw ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd
[23967.169587] CPU: 0 PID: 4559 Comm: xfs_io Not tainted 4.4.0-1155-aws #170-Ubuntu
[23967.169587] Hardware name: Xen HVM domU, BIOS 4.2.amazon 08/24/2006
[23967.169587] task: ffff8800cce02a00 ti: ffff8800d43f4000 task.ti: ffff8800d43f4000
[23967.169587] RIP: 0010:[<ffffffff812dec7e>] [<ffffffff812dec7e>] ext4_mb_normalize_request.constprop.29+0x40e/0x4c0
[23967.169587] RSP: 0018:ffff8800d43f7860 EFLAGS: 00010246
[23967.169587] RAX: 0000000000000000 RBX: ffff8800c2fbecb8 RCX: 0000000000001500
[23967.169587] RDX: 0000000000001500 RSI: ffff8800d43f79e8 RDI: ffff8800e14b8080
[23967.169587] RBP: ffff8800d43f78b0 R08: 000000000000000a R09: 0000000000000001
[23967.169587] R10: 0000000000000001 R11: 0000000000000800 R12: ffff8800e14b8080
[23967.169587] R13: 0000000000000000 R14: 0000000000001500 R15: ffff8800c2fbecb8
[23967.169587] FS: 00007fec45ce6700(0000) GS:ffff88010b200000(0000) knlGS:0000000000000000
[23967.169587] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[23967.169587] CR2: 0000000001250000 CR3: 00000000c0e8a000 CR4: 0000000000160670
[23967.169587] Stack:
[23967.169587] ffff8800d43f79e8 0000000000000000 ffff8800c2fbea60 ffff8800e559c800
[23967.169587] 0000150000000000 ffff8800e559c800 ffff8800d43f79c4 ffff8800e5599800
[23967.169587] ffff8800d43f79e8 ffff8800e14b8080 ffff8800d43f7960 ffffffff812e5096
[23967.169587] Call Trace:
[23967.169587] [<ffffffff812e5096>] ext4_mb_new_blocks+0x5d6/0xac0
[23967.169587] [<ffffffff812d394d>] ? __read_extent_tree_block+0xcd/0x140
[23967.169587] [<ffffffff812d3c57>] ? ext4_ext_search_right+0x297/0x2f0
[23967.169587] [<ffffffff812d3c57>] ? ext4_ext_search_right+0x297/0x2f0
[23967.169587] [<ffffffff812d997d>] ext4_ext_map_blocks+0x63d/0xfe0
[23967.169587] [<ffffffff818414a1>] ? __schedule+0x341/0x810
[23967.169587] [<ffffffff81400001>] ? cfq_group_served+0x3e1/0x4b0
[23967.169587] [<ffffffff812a7dd4>] ext4_map_blocks+0x1b4/0x5b0
[23967.169587] [<ffffffff811f6ddc>] ? kmem_cache_alloc+0x1cc/0x1f0
[23967.169587] [<ffffffff812511e1>] ? alloc_buffer_head+0x21/0x60
[23967.169587] [<ffffffff812a828e>] _ext4_get_block+0xbe/0x220
[23967.169587] [<ffffffff812a8406>] ext4_get_block+0x16/0x20
[23967.169587] [<ffffffff812a6783>] ext4_block_write_begin+0x193/0x4e0
[23967.169587] [<ffffffff812a83f0>] ? _ext4_get_block+0x220/0x220
[23967.169587] [<ffffffff812dc65d>] ? __ext4_journal_start_sb+0x6d/0x120
[23967.169587] [<ffffffff812aca7a>] ext4_write_begin+0x19a/0x460
[23967.169587] [<ffffffff81195ebe>] generic_perform_write+0xce/0x1d0
[23967.169587] [<ffffffff812347cc>] ? file_update_time+0xcc/0x110
[23967.169587] [<ffffffff81197622>] __generic_file_write_iter+0x1a2/0x1e0
[23967.169587] [<ffffffff812a0f24>] ext4_file_write_iter+0x1c4/0x4b0
[23967.169587] [<ffffffff8120cea9>] ? mem_cgroup_try_charge+0x69/0x1d0
[23967.169587] [<ffffffff811a7067>] ? lru_cache_add_active_or_unevictable+0x27/0xa0
[23967.169587] [<ffffffff81218765>] new_sync_write+0xa5/0xf0
[23967.169587] [<ffffffff812187d9>] __vfs_write+0x29/0x40
[23967.169587] [<ffffffff81218f69>] vfs_write+0xa9/0x1a0
[23967.169587] [<ffffffff81219e15>] SyS_pwrite64+0x95/0xb0
[23967.169587] [<ffffffff818464db>] entry_SYSCALL_64_fastpath+0x22/0xd0
[23967.169587] Code: d0 49 29 c5 e9 ca fd ff ff 41 bd 00 80 00 00 e9 8e fd ff ff 8b 56 10 31 c0 e9 70 fd ff ff 0f 0b 41 bd 00 00 01 00 e9 77 fd ff ff <0f> 0b 0f 0b 0f 0b 41 bd 00 00 02 00 e9 66 fd ff ff 0f 0b 41 bd
[23967.169587] RIP [<ffffffff812dec7e>] ext4_mb_normalize_request.constprop.29+0x40e/0x4c0
[23967.169587] RSP <ffff8800d43f7860>
[23967.533188] ---[ end trace 7e0e603d5fd1fa33 ]---

[Thadeu Lima de Souza Cascardo (cascardo)]

We should skip this test when running xfstests on ext4 on 4.4 kernels.