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Date: Sat, 31 Mar 2012 08:30:40 +0800
From: Yongqiang Yang <xiaoqiangnk@...il.com>
To: Daniel Drake <dsd@...top.org>
Cc: linux-ext4@...r.kernel.org
Subject: Re: ext4 online resize crash
On 3/31/12, Daniel Drake <dsd@...top.org> wrote:
> Hi,
>
> ext4 online resize crashes here. It has done since I first tested it
> during the 3.3-rc series. Reproducible every time.
> Reproduced on linus master of today.
According to dumpe2fs, the filesystem initially has 28 groups, that is
3.5GB, then it is resized to a new size. Right? Could you point out
what's the new size, a specific number will be appreciated!
Yongqiang.
>
> It fails in ext4_alloc_group_tables() :
> BUG_ON(src_group >= group_data[0].group + flex_gd->count);
>
> ------------[ cut here ]------------
> kernel BUG at fs/ext4/resize.c:236!
> invalid opcode: 0000 [#1] PREEMPT
> Modules linked in:
>
> Pid: 754, comm: resize2fs Not tainted 3.3.0+ #24 OLPC XO/XO
> EIP: 0060:[<b050c1dc>] EFLAGS: 00010246 CPU: 0
> EIP is at ext4_resize_fs+0x33e/0x7aa
> EAX: 0000001e EBX: eb4d0800 ECX: 00000007 EDX: e9bf5800
> ESI: 00000000 EDI: 00000000 EBP: e9d6decc ESP: e9d6de50
> DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
> CR0: 8005003b CR2: a754a746 CR3: 39d92000 CR4: 00000690
> DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> DR6: ffff0ff0 DR7: 00000400
> Process resize2fs (pid: 754, ti=e9d6c000 task=e9d8b6c0 task.ti=e9d6c000)
> Stack:
> b04b5420 e9d6def4 e942c400 0000001d 000e817f 00000000 e6121780 00000000
> 00000001 00000001 00008000 00000000 000e8180 00000000 00000010 000e8000
> 00000000 00000000 00000000 0000001e e9be8800 e9bf5800 0000001c 0000001d
> Call Trace:
> [<b04b5420>] ? mntput_no_expire+0x27/0xe3
> [<b04f649a>] ext4_ioctl+0x726/0x850
> [<b0438a35>] ? get_parent_ip+0xb/0x31
> [<b0740196>] ? sub_preempt_count+0x81/0x8e
> [<b073de32>] ? _raw_spin_unlock_irqrestore+0x1c/0x32
> [<b055e09f>] ? __debug_check_no_obj_freed+0xe4/0x137
> [<b04f5d74>] ? ext4_bio_write_page+0x342/0x342
> [<b04adc03>] do_vfs_ioctl+0x459/0x48a
> [<b04a0873>] ? do_sys_open+0x166/0x170
> [<b04adc7a>] sys_ioctl+0x46/0x68
> [<b04a08a3>] ? sys_open+0x26/0x2e
> [<b0742610>] sysenter_do_call+0x12/0x26
> Code: ff 85 c0 74 19 8b 55 d0 8b 45 d4 e8 97 fa fd ff 8b 75 8c 0f b7
> 96 ce 00 00 00 8d 74 10 01 8b 55 d8 8b 42 08 03 03 39 45 d0 72 02 <0f>
> 0b 8b 45 d0 f7 65 ac c7 45 cc 00 00 00 00 89 45 ac 8b 45 c8
> EIP: [<b050c1dc>] ext4_resize_fs+0x33e/0x7aa SS:ESP 0068:e9d6de50
> ---[ end trace 6a35bc10f51f2ada ]---
>
> Filesystem was created with:
> mkfs.ext4 -O dir_index,^huge_file -E resize=8G -m1 -L OLPCRoot $root_loop
>
> If I add the following printk immediately before the BUG_ON:
> pr_info("src_group %d group %d count %d\n", src_group,
> group_data[0].group, flex_gd->count);
>
> The (complete) output is:
> src_group 29 group 29 count 1
> src_group 30 group 29 count 1
> <crash>
>
> dumpe2fs output:
>
> Filesystem volume name: OLPCRoot
> Last mounted on: /
> Filesystem UUID: 065cbf69-807e-4d2f-bf6d-67d79eebef89
> Filesystem magic number: 0xEF53
> Filesystem revision #: 1 (dynamic)
> Filesystem features: has_journal ext_attr resize_inode dir_index
> filetype needs_recovery extent flex_bg sparse_super large_file
> uninit_bg dir_nlink extra_isize
> Filesystem flags: signed_directory_hash
> Default mount options: journal_data_ordered user_xattr acl
> Filesystem state: clean
> Errors behavior: Continue
> Filesystem OS type: Linux
> Inode count: 232000
> Block count: 950272
> Reserved block count: 9262
> Free blocks: 440094
> Free inodes: 155413
> First block: 0
> Block size: 4096
> Fragment size: 4096
> Reserved GDT blocks: 226
> Blocks per group: 32768
> Fragments per group: 32768
> Inodes per group: 8000
> Inode blocks per group: 500
> Flex block group size: 16
> Filesystem created: Sat Mar 24 18:46:36 2012
> Last mount time: Fri Mar 30 15:58:23 2012
> Last write time: Thu Mar 29 22:06:20 2012
> Mount count: 16
> Maximum mount count: -1
> Last checked: Sat Mar 24 18:46:36 2012
> Check interval: 0 (<none>)
> Lifetime writes: 75 MB
> Reserved blocks uid: 0 (user root)
> Reserved blocks gid: 0 (group root)
> First inode: 11
> Inode size: 256
> Required extra isize: 28
> Desired extra isize: 28
> Journal inode: 8
> Default directory hash: half_md4
> Directory Hash Seed: 260f9726-4cbe-4147-9cf8-191517538697
> Journal backup: inode blocks
> Journal features: journal_incompat_revoke
> Journal size: 64M
> Journal length: 16384
> Journal sequence: 0x0000009b
> Journal start: 1
>
>
> Group 0: (Blocks 0-32767) [ITABLE_ZEROED]
> Checksum 0x3375, unused inodes 0
> Primary superblock at 0, Group descriptors at 1-1
> Reserved GDT blocks at 2-227
> Block bitmap at 228 (+228), Inode bitmap at 244 (+244)
> Inode table at 260-759 (+260)
> 15960 free blocks, 0 free inodes, 1662 directories
> Free blocks: 15733-15811, 16886, 16888-32767
> Free inodes:
> Group 1: (Blocks 32768-65535) [ITABLE_ZEROED]
> Checksum 0x4a7c, unused inodes 0
> Backup superblock at 32768, Group descriptors at 32769-32769
> Reserved GDT blocks at 32770-32995
> Block bitmap at 229 (bg #0 + 229), Inode bitmap at 245 (bg #0 + 245)
> Inode table at 760-1259 (bg #0 + 760)
> 0 free blocks, 0 free inodes, 2424 directories
> Free blocks:
> Free inodes:
> Group 2: (Blocks 65536-98303) [ITABLE_ZEROED]
> Checksum 0x9c9f, unused inodes 0
> Block bitmap at 230 (bg #0 + 230), Inode bitmap at 246 (bg #0 + 246)
> Inode table at 1260-1759 (bg #0 + 1260)
> 0 free blocks, 0 free inodes, 698 directories
> Free blocks:
> Free inodes:
> Group 3: (Blocks 98304-131071) [ITABLE_ZEROED]
> Checksum 0xeec9, unused inodes 0
> Backup superblock at 98304, Group descriptors at 98305-98305
> Reserved GDT blocks at 98306-98531
> Block bitmap at 231 (bg #0 + 231), Inode bitmap at 247 (bg #0 + 247)
> Inode table at 1760-2259 (bg #0 + 1760)
> 0 free blocks, 0 free inodes, 510 directories
> Free blocks:
> Free inodes:
> Group 4: (Blocks 131072-163839) [ITABLE_ZEROED]
> Checksum 0xb69b, unused inodes 0
> Block bitmap at 232 (bg #0 + 232), Inode bitmap at 248 (bg #0 + 248)
> Inode table at 2260-2759 (bg #0 + 2260)
> 0 free blocks, 53 free inodes, 2257 directories
> Free blocks:
> Free inodes: 39722-39774
> Group 5: (Blocks 163840-196607) [ITABLE_ZEROED]
> Checksum 0xfbbb, unused inodes 6754
> Backup superblock at 163840, Group descriptors at 163841-163841
> Reserved GDT blocks at 163842-164067
> Block bitmap at 233 (bg #0 + 233), Inode bitmap at 249 (bg #0 + 249)
> Inode table at 2760-3259 (bg #0 + 2760)
> 0 free blocks, 6768 free inodes, 812 directories, 6754 unused inodes
> Free blocks:
> Free inodes: 40779, 40790, 40793, 40796, 40810-40811, 40833,
> 40860-40863, 40865-40867, 41247-48000
> Group 6: (Blocks 196608-229375) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0xd23b, unused inodes 8000
> Block bitmap at 234 (bg #0 + 234), Inode bitmap at 250 (bg #0 + 250)
> Inode table at 3260-3759 (bg #0 + 3260)
> 0 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks:
> Free inodes: 48001-56000
> Group 7: (Blocks 229376-262143) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0x272c, unused inodes 8000
> Backup superblock at 229376, Group descriptors at 229377-229377
> Reserved GDT blocks at 229378-229603
> Block bitmap at 235 (bg #0 + 235), Inode bitmap at 251 (bg #0 + 251)
> Inode table at 3760-4259 (bg #0 + 3760)
> 0 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks:
> Free inodes: 56001-64000
> Group 8: (Blocks 262144-294911) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0x026c, unused inodes 8000
> Block bitmap at 236 (bg #0 + 236), Inode bitmap at 252 (bg #0 + 252)
> Inode table at 4260-4759 (bg #0 + 4260)
> 0 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks:
> Free inodes: 64001-72000
> Group 9: (Blocks 294912-327679) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0xe048, unused inodes 8000
> Backup superblock at 294912, Group descriptors at 294913-294913
> Reserved GDT blocks at 294914-295139
> Block bitmap at 237 (bg #0 + 237), Inode bitmap at 253 (bg #0 + 253)
> Inode table at 4760-5259 (bg #0 + 4760)
> 0 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks:
> Free inodes: 72001-80000
> Group 10: (Blocks 327680-360447) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0xbf72, unused inodes 8000
> Block bitmap at 238 (bg #0 + 238), Inode bitmap at 254 (bg #0 + 254)
> Inode table at 5260-5759 (bg #0 + 5260)
> 0 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks:
> Free inodes: 80001-88000
> Group 11: (Blocks 360448-393215) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0x4a65, unused inodes 8000
> Block bitmap at 239 (bg #0 + 239), Inode bitmap at 255 (bg #0 + 255)
> Inode table at 5760-6259 (bg #0 + 5760)
> 0 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks:
> Free inodes: 88001-96000
> Group 12: (Blocks 393216-425983) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0xd728, unused inodes 8000
> Block bitmap at 240 (bg #0 + 240), Inode bitmap at 256 (bg #0 + 256)
> Inode table at 6260-6759 (bg #0 + 6260)
> 6932 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 401610-401623, 417312-417329, 417535-417793,
> 417795-417798, 417800-418625, 418683, 418750-418751, 418791,
> 418810-418815, 420061, 420173-420355, 420357-420867, 420869-421379,
> 421381-421891, 421893, 421895-422399, 422406-425983
> Free inodes: 96001-104000
> Group 13: (Blocks 425984-458751) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0xdaf4, unused inodes 8000
> Block bitmap at 241 (bg #0 + 241), Inode bitmap at 257 (bg #0 + 257)
> Inode table at 6760-7259 (bg #0 + 6760)
> 14873 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 443879-458751
> Free inodes: 104001-112000
> Group 14: (Blocks 458752-491519) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED]
> Checksum 0x4691, unused inodes 8000
> Block bitmap at 242 (bg #0 + 242), Inode bitmap at 258 (bg #0 + 258)
> Inode table at 7260-7759 (bg #0 + 7260)
> 32768 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 458752-491519
> Free inodes: 112001-120000
> Group 15: (Blocks 491520-524287) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED]
> Checksum 0xb386, unused inodes 8000
> Block bitmap at 243 (bg #0 + 243), Inode bitmap at 259 (bg #0 + 259)
> Inode table at 7760-8259 (bg #0 + 7760)
> 32768 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 491520-524287
> Free inodes: 120001-128000
> Group 16: (Blocks 524288-557055) [ITABLE_ZEROED]
> Checksum 0x13b4, unused inodes 0
> Block bitmap at 524288 (+0), Inode bitmap at 524304 (+16)
> Inode table at 524320-524819 (+32)
> 18654 free blocks, 0 free inodes, 1869 directories
> Free blocks: 538402-557055
> Free inodes:
> Group 17: (Blocks 557056-589823) [ITABLE_ZEROED]
> Checksum 0x4522, unused inodes 0
> Block bitmap at 524289 (bg #16 + 1), Inode bitmap at 524305 (bg #16 + 17)
> Inode table at 524820-525319 (bg #16 + 532)
> 0 free blocks, 0 free inodes, 1947 directories
> Free blocks:
> Free inodes:
> Group 18: (Blocks 589824-622591) [ITABLE_ZEROED]
> Checksum 0x31d3, unused inodes 0
> Block bitmap at 524290 (bg #16 + 2), Inode bitmap at 524306 (bg #16 + 18)
> Inode table at 525320-525819 (bg #16 + 1032)
> 0 free blocks, 0 free inodes, 464 directories
> Free blocks:
> Free inodes:
> Group 19: (Blocks 622592-655359) [ITABLE_ZEROED]
> Checksum 0x6ead, unused inodes 0
> Block bitmap at 524291 (bg #16 + 3), Inode bitmap at 524307 (bg #16 + 19)
> Inode table at 525820-526319 (bg #16 + 1532)
> 23683 free blocks, 0 free inodes, 729 directories
> Free blocks: 631165-631295, 631808-655359
> Free inodes:
> Group 20: (Blocks 655360-688127) [ITABLE_ZEROED]
> Checksum 0x48ee, unused inodes 4591
> Block bitmap at 524292 (bg #16 + 4), Inode bitmap at 524308 (bg #16 + 20)
> Inode table at 526320-526819 (bg #16 + 2032)
> 32768 free blocks, 4591 free inodes, 2453 directories, 4591 unused inodes
> Free blocks: 655360-688127
> Free inodes: 163410-168000
> Group 21: (Blocks 688128-720895) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED]
> Checksum 0x3e6e, unused inodes 8000
> Block bitmap at 524293 (bg #16 + 5), Inode bitmap at 524309 (bg #16 + 21)
> Inode table at 526820-527319 (bg #16 + 2532)
> 32768 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 688128-720895
> Free inodes: 168001-176000
> Group 22: (Blocks 720896-753663) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED]
> Checksum 0x59ba, unused inodes 8000
> Block bitmap at 524294 (bg #16 + 6), Inode bitmap at 524310 (bg #16 + 22)
> Inode table at 527320-527819 (bg #16 + 3032)
> 32768 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 720896-753663
> Free inodes: 176001-184000
> Group 23: (Blocks 753664-786431) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED]
> Checksum 0x8370, unused inodes 8000
> Block bitmap at 524295 (bg #16 + 7), Inode bitmap at 524311 (bg #16 + 23)
> Inode table at 527820-528319 (bg #16 + 3532)
> 32768 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 753664-786431
> Free inodes: 184001-192000
> Group 24: (Blocks 786432-819199) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED]
> Checksum 0x2fb2, unused inodes 8000
> Block bitmap at 524296 (bg #16 + 8), Inode bitmap at 524312 (bg #16 + 24)
> Inode table at 528320-528819 (bg #16 + 4032)
> 32768 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 786432-819199
> Free inodes: 192001-200000
> Group 25: (Blocks 819200-851967) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0x93ca, unused inodes 8000
> Backup superblock at 819200, Group descriptors at 819201-819201
> Reserved GDT blocks at 819202-819427
> Block bitmap at 524297 (bg #16 + 9), Inode bitmap at 524313 (bg #16 + 25)
> Inode table at 528820-529319 (bg #16 + 4532)
> 32540 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 819428-851967
> Free inodes: 200001-208000
> Group 26: (Blocks 851968-884735) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED]
> Checksum 0x7f73, unused inodes 8000
> Block bitmap at 524298 (bg #16 + 10), Inode bitmap at 524314 (bg #16 + 26)
> Inode table at 529320-529819 (bg #16 + 5032)
> 32768 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 851968-884735
> Free inodes: 208001-216000
> Group 27: (Blocks 884736-917503) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0x2ed4, unused inodes 8000
> Backup superblock at 884736, Group descriptors at 884737-884737
> Reserved GDT blocks at 884738-884963
> Block bitmap at 524299 (bg #16 + 11), Inode bitmap at 524315 (bg #16 + 27)
> Inode table at 529820-530319 (bg #16 + 5532)
> 32540 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 884964-917503
> Free inodes: 216001-224000
> Group 28: (Blocks 917504-950271) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0x4366, unused inodes 8000
> Block bitmap at 524300 (bg #16 + 12), Inode bitmap at 524316 (bg #16 + 28)
> Inode table at 530320-530819 (bg #16 + 6032)
> 32768 free blocks, 8000 free inodes, 0 directories, 8000 unused inodes
> Free blocks: 917504-950271
> Free inodes: 224001-232000
>
> Happy to test patches!
>
> Thanks,
> Daniel
>
--
Best Wishes
Yongqiang Yang
--
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