Hi, While running my tool(attachment), I would encounter the BUG_ON, and I FAILED to find where went wrong :(
The tool is with inode_cache option, and mainly do three things: a. run Chris's synctest in BACKGROUND b. create 100 snapshots c. after b, run "btrfs fi balance" You can follow these tips to reproduce the bug: 1) untar the attachment, 2) prepare 4 partitions, the mount point is default to /mnt, 3) $ ./2_while.sh /dev/sdb1 /dev/sdb2 /dev/sdb3 /dev/sdb4 4) then just wait several minutes and you will get the bug. NOTE: You MAY hit a warning and I've fixed it with this patch: http://marc.info/?l=linux-btrfs&m=131547325515336&w=2 === kernel BUG at fs/btrfs/relocation.c:2502! [...] Call Trace: [<ffffffffa03d7a6b>] ? block_rsv_add_bytes+0x2b/0x70 [btrfs] [<ffffffffa043292f>] relocate_tree_blocks+0x60f/0x6d0 [btrfs] [<ffffffffa0433498>] ? add_data_references+0x248/0x260 [btrfs] [<ffffffffa0433722>] relocate_block_group+0x272/0x620 [btrfs] [<ffffffffa0433c83>] btrfs_relocate_block_group+0x1b3/0x2d0 [btrfs] [<ffffffffa0413163>] btrfs_relocate_chunk+0x93/0x6a0 [btrfs] [<ffffffff8103bfb3>] ? __wake_up+0x53/0x70 [<ffffffffa041db42>] ? btrfs_tree_read_unlock_blocking+0x42/0x70 [btrfs] [<ffffffffa04144d2>] btrfs_balance+0x212/0x2a0 [btrfs] [<ffffffff81152459>] ? path_openat+0x109/0x3e0 [<ffffffffa041d398>] btrfs_ioctl+0x798/0xd20 [btrfs] [<ffffffff81112ec3>] ? handle_mm_fault+0x143/0x260 [<ffffffff81474504>] ? do_page_fault+0x1d4/0x440 [<ffffffff8115562a>] do_vfs_ioctl+0x9a/0x540 [<ffffffff81155b71>] sys_ioctl+0xa1/0xb0 [<ffffffff8147896b>] system_call_fastpath+0x16/0x1b Code: 00 00 00 00 00 eb f6 0f 0b eb fe 0f 0b 0f 1f 84 00 00 00 00 00 eb f6 0f 0b eb fe 0f 0b 0f 1f 84 00 00 00 00 00 eb f6 0f 0b eb fe <0f> 0b 0f 1f 84 00 00 00 00 00 eb f6 48 83 7a 68 00 0f 84 eb fa RIP [<ffffffffa0430c26>] do_relocation+0x546/0x570 [btrfs] RSP <ffff88003c0859a8> ---[ end trace 6a4328153ff7ff17 ]---
TOOL.tar
Description: Unix tar archive
