On 10/25/2022 9:23 PM, Baokun Li wrote: > We got a issue as fllows: > ================================================================== > kernel BUG at fs/ext4/extents_status.c:202! > invalid opcode: 0000 [#1] PREEMPT SMP > CPU: 1 PID: 810 Comm: mount Not tainted 6.1.0-rc1-next-g9631525255e3 #352 > RIP: 0010:__es_tree_search.isra.0+0xb8/0xe0 > RSP: 0018:ffffc90001227900 EFLAGS: 00010202 > RAX: 0000000000000000 RBX: 0000000077512a0f RCX: 0000000000000000 > RDX: 0000000000000002 RSI: 0000000000002a10 RDI: ffff8881004cd0c8 > RBP: ffff888177512ac8 R08: 47ffffffffffffff R09: 0000000000000001 > R10: 0000000000000001 R11: 00000000000679af R12: 0000000000002a10 > R13: ffff888177512d88 R14: 0000000077512a10 R15: 0000000000000000 > FS: 00007f4bd76dbc40(0000)GS:ffff88842fd00000(0000)knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00005653bf993cf8 CR3: 000000017bfdf000 CR4: 00000000000006e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > ext4_es_cache_extent+0xe2/0x210 > ext4_cache_extents+0xd2/0x110 > ext4_find_extent+0x5d5/0x8c0 > ext4_ext_map_blocks+0x9c/0x1d30 > ext4_map_blocks+0x431/0xa50 > ext4_getblk+0x82/0x340 > ext4_bread+0x14/0x110 > ext4_quota_read+0xf0/0x180 > v2_read_header+0x24/0x90 > v2_check_quota_file+0x2f/0xa0 > dquot_load_quota_sb+0x26c/0x760 > dquot_load_quota_inode+0xa5/0x190 > ext4_enable_quotas+0x14c/0x300 > __ext4_fill_super+0x31cc/0x32c0 > ext4_fill_super+0x115/0x2d0 > get_tree_bdev+0x1d2/0x360 > ext4_get_tree+0x19/0x30 > vfs_get_tree+0x26/0xe0 > path_mount+0x81d/0xfc0 > do_mount+0x8d/0xc0 > __x64_sys_mount+0xc0/0x160 > do_syscall_64+0x35/0x80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > </TASK> > ================================================================== > > Above issue may happen as follows: > ------------------------------------- > ext4_fill_super > ext4_orphan_cleanup > ext4_enable_quotas > ext4_quota_enable > ext4_iget --> get error inode <5> > ext4_ext_check_inode --> Wrong imode makes it escape inspection > make_bad_inode(inode) --> EXT4_BOOT_LOADER_INO set imode > dquot_load_quota_inode > vfs_setup_quota_inode --> check pass > dquot_load_quota_sb > v2_check_quota_file > v2_read_header > ext4_quota_read > ext4_bread > ext4_getblk > ext4_map_blocks > ext4_ext_map_blocks > ext4_find_extent > ext4_cache_extents > ext4_es_cache_extent > __es_tree_search.isra.0 > ext4_es_end --> Wrong extents trigger BUG_ON > > In the above issue, s_usr_quota_inum is set to 5, but inode<5> contains > incorrect imode and disordered extents. Because 5 is EXT4_BOOT_LOADER_INO, > the ext4_ext_check_inode check in the ext4_iget function can be bypassed, > finally, the extents that are not checked trigger the BUG_ON in the > __es_tree_search function. To solve this issue, check whether the inode is > bad_inode in vfs_setup_quota_inode(). > > Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx> The analysis and the provided call chain looks really good, only thing non-blocker is missing that maintainer might want it version history. Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx> -ck
