Re: panic during rebalance, and now upon mount

[Troy Ablan <tablan@gmail.com>]

Yan, Zheng wrote:
> Thank you for reporting this. Would you please run btrsck and mount
> that fs again with the debug patch attached below.
>
> Regards
> Yan, Zheng
>
> ---
> diff -urp 1/fs/btrfs/extent-tree.c 2/fs/btrfs/extent-tree.c
> --- 1/fs/btrfs/extent-tree.c	2010-01-22 12:16:34.203525744 +0800
> +++ 2/fs/btrfs/extent-tree.c	2010-01-30 20:03:23.609292953 +0800
> @@ -5373,8 +5373,18 @@ static noinline int walk_up_proc(struct
>  		if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
>  			parent = eb->start;
>  		else
> -			BUG_ON(root->root_key.objectid !=
> -			       btrfs_header_owner(eb));
> +			if (root->root_key.objectid !=
> +			    btrfs_header_owner(eb)) {
> +				printk("root %llu %llu\n",
> +				       root->root_key.objectid,
> +				       root->root_key.offset);
> +				printk("node %llu refs %llu flags %llu owner %llu reloc %d\n",
> +				       eb->start, wc->refs[level], wc->flags[level],
> +				       btrfs_header_owner(eb),
> +				       btrfs_header_flag(eb, BTRFS_HEADER_FLAG_RELOC));
> +
> +				BUG();
> +			}
>  	} else {
>  		if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
>  			parent = path->nodes[level + 1]->start;
> @@ -5496,6 +5506,8 @@ int btrfs_drop_snapshot(struct btrfs_roo
>  		       sizeof(wc->update_progress));
>  	} else {
>  		btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
> +		printk("drop progress %llu %d %llu\n", key.objectid,
> +			key.type, key.offset);
>  		memcpy(&wc->update_progress, &key,
>  		       sizeof(wc->update_progress));
>   
Thanks for the quick reply. 

btrfsck bails out

-[~:#]- btrfsck /dev/mapper/btra
btrfsck: btrfsck.c:584: splice_shared_node: Assertion `!(src ==
&src_node->root_cache)' failed.
Aborted


A mount produces this.   I did not use -o compress this time, but I
suspect it doesn't matter.

[ 3192.249204] device label bk0 devid 1 transid 111135 /dev/mapper/btra
[ 3240.180895] root 18446744073709551608 536
[ 3240.180898] node 9197760471040 refs 0 flags 0 owner 536 reloc 1
[ 3240.180904] ------------[ cut here ]------------
[ 3240.180957] kernel BUG at fs/btrfs/extent-tree.c:5386!
[ 3240.181009] invalid opcode: 0000 [#1] SMP
[ 3240.181064] last sysfs file:
/sys/devices/virtual/block/md1/md/metadata_version
[ 3240.181159] CPU 3
[ 3240.181210] Pid: 6143, comm: btrfs-relocate- Tainted: G        W 
2.6.33-rc6 #2 P55M-GD45 (MS-7588) /MS-7588
[ 3240.181309] RIP: 0010:[<ffffffff8129e65f>]  [<ffffffff8129e65f>]
walk_up_proc+0x42f/0x490
[ 3240.181413] RSP: 0018:ffff880113183c90  EFLAGS: 00010286
[ 3240.181465] RAX: 0000000000000046 RBX: ffff88013e70eb40 RCX:
000000000003ffff
[ 3240.181520] RDX: ffff8800282c0000 RSI: 0000000000000086 RDI:
0000000000000000
[ 3240.181575] RBP: ffff880113183cf0 R08: 0000000000000000 R09:
ffffffff816ac57f
[ 3240.181630] R10: 0000000000000000 R11: 0000000000000004 R12:
0000000000000000
[ 3240.181685] R13: ffff880118ce1d90 R14: ffff880113182000 R15:
ffff88013f00a000
[ 3240.181740] FS:  0000000000000000(0000) GS:ffff8800282c0000(0000)
knlGS:0000000000000000
[ 3240.181837] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3240.181890] CR2: 00007fc6e1ceb3dc CR3: 00000000018d3000 CR4:
00000000000006e0
[ 3240.182733] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 3240.182788] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 3240.182844] Process btrfs-relocate- (pid: 6143, threadinfo
ffff880113182000, task ffff880138c78380)
[ 3240.182942] Stack:
[ 3240.182988]  ffff880113183d20 0000000000000002 0000000000000008
0000000000000206
[ 3240.183050] <0> ffff880113183d20 ffff880113e948e0 0000000000000000
0000000000000000
[ 3240.183158] <0> ffff88013e70eb40 ffff88011b8d6f40 0000000000000000
ffff880113182000
[ 3240.183309] Call Trace:
[ 3240.183358]  [<ffffffff8129e7ff>] walk_up_tree+0x13f/0x1c0
[ 3240.183412]  [<ffffffff8129fa68>] btrfs_drop_snapshot+0x218/0x5e0
[ 3240.183466]  [<ffffffff812a9e80>] ? __btrfs_end_transaction+0x100/0x170
[ 3240.183680]  [<ffffffff812e7e2d>] merge_func+0x7d/0xc0
[ 3240.183735]  [<ffffffff812d265a>] worker_loop+0x17a/0x540
[ 3240.183789]  [<ffffffff812d24e0>] ? worker_loop+0x0/0x540
[ 3240.183842]  [<ffffffff812d24e0>] ? worker_loop+0x0/0x540
[ 3240.183895]  [<ffffffff81095936>] kthread+0x96/0xa0
[ 3240.183949]  [<ffffffff81034bd4>] kernel_thread_helper+0x4/0x10
[ 3240.184004]  [<ffffffff816ac929>] ? restore_args+0x0/0x30
[ 3240.184057]  [<ffffffff810958a0>] ? kthread+0x0/0xa0
[ 3240.184109]  [<ffffffff81034bd0>] ? kernel_thread_helper+0x0/0x10
[ 3240.184162] Code: 4e 1c 48 c7 c7 98 6a 81 81 83 e2 02 48 8b 45 b0 41
0f 95 c1 48 8b 0c c3 4a 8b 14 e3 41 83 e1 01 49 8b 75 00 31 c0 e8 2d af
40 00 <0f> 0b eb fe 0f 1f 44 00 00 4c 89 ef e8 40 70 03 00 4c 89 ef e8
[ 3240.184466] RIP  [<ffffffff8129e65f>] walk_up_proc+0x42f/0x490
[ 3240.184522]  RSP <ffff880113183c90>
[ 3240.184878] ---[ end trace 3c8b3f22cb58d773 ]---


-- 
Troy