EXT4-fs (loop4): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop4): revision level too high, forcing read-only mode EXT4-fs (loop4): orphan cleanup on readonly fs ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.2152/12582 is trying to acquire lock: ffff8880742748c0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x338/0x1a90 fs/ext4/inode.c:606 but task is already holding lock: ffff88802c8dc208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_read_dquot+0x4a/0x110 fs/quota/quota_v2.c:335 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4a/0x110 fs/quota/quota_v2.c:335 dquot_acquire+0x152/0x520 fs/quota/dquot.c:491 ext4_acquire_dquot+0x2e3/0x4a0 fs/ext4/super.c:6837 dqget+0x713/0xbb0 fs/quota/dquot.c:1013 __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1542 ext4_process_orphan+0x4c/0x2e0 fs/ext4/orphan.c:327 ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693 get_tree_bdev+0x3e6/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 dquot_commit+0x5a/0x410 fs/quota/dquot.c:535 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6817 mark_dquot_dirty fs/quota/dquot.c:400 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:440 __dquot_free_space+0x7f8/0xbc0 fs/quota/dquot.c:1967 dquot_free_space_nodirty include/linux/quotaops.h:372 [inline] dquot_free_space include/linux/quotaops.h:377 [inline] dquot_free_block include/linux/quotaops.h:388 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6153 [inline] ext4_free_blocks+0x1be5/0x26a0 fs/ext4/mballoc.c:6283 ext4_remove_blocks fs/ext4/extents.c:2541 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2707 [inline] ext4_ext_remove_space+0x1e82/0x43d0 fs/ext4/extents.c:2955 ext4_ext_truncate+0x213/0x370 fs/ext4/extents.c:4491 ext4_truncate+0xa5b/0x12a0 fs/ext4/inode.c:4302 ext4_evict_inode+0xb21/0x10e0 fs/ext4/inode.c:288 evict+0x4b6/0x8b0 fs/inode.c:705 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x374/0x4a0 fs/namei.c:4212 do_rmdir+0x29a/0x5c0 fs/namei.c:4260 __do_sys_unlinkat fs/namei.c:4440 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4434 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ei->i_data_sem/2){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x338/0x1a90 fs/ext4/inode.c:606 ext4_getblk+0x1c5/0x720 fs/ext4/inode.c:892 ext4_bread+0x26/0x170 fs/ext4/inode.c:948 ext4_quota_read+0x17f/0x380 fs/ext4/super.c:7182 read_blk fs/quota/quota_tree.c:61 [inline] find_tree_dqentry+0x1cc/0xf40 fs/quota/quota_tree.c:671 find_tree_dqentry+0x6ac/0xf40 fs/quota/quota_tree.c:698 find_tree_dqentry+0x6ac/0xf40 fs/quota/quota_tree.c:698 find_tree_dqentry+0x6ac/0xf40 fs/quota/quota_tree.c:698 find_dqentry fs/quota/quota_tree.c:716 [inline] qtree_read_dquot+0x59a/0x880 fs/quota/quota_tree.c:736 v2_read_dquot+0xc0/0x110 fs/quota/quota_v2.c:336 dquot_acquire+0x152/0x520 fs/quota/dquot.c:491 ext4_acquire_dquot+0x2e3/0x4a0 fs/ext4/super.c:6837 dqget+0x713/0xbb0 fs/quota/dquot.c:1013 __dquot_initialize+0x324/0xd00 fs/quota/dquot.c:1542 ext4_process_orphan+0x4c/0x2e0 fs/ext4/orphan.c:327 ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693 get_tree_bdev+0x3e6/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &ei->i_data_sem/2 --> &dquot->dq_lock --> &s->s_dquot.dqio_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&s->s_dquot.dqio_sem); lock(&dquot->dq_lock); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); *** DEADLOCK *** 3 locks held by syz.4.2152/12582: #0: ffff88802c8dc0e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x1fb/0x930 fs/super.c:228 #1: ffff888055e21ca8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x63/0x520 fs/quota/dquot.c:488 #2: ffff88802c8dc208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_read_dquot+0x4a/0x110 fs/quota/quota_v2.c:335 stack backtrace: CPU: 1 PID: 12582 Comm: syz.4.2152 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x338/0x1a90 fs/ext4/inode.c:606 ext4_getblk+0x1c5/0x720 fs/ext4/inode.c:892 ext4_bread+0x26/0x170 fs/ext4/inode.c:948 ext4_quota_read+0x17f/0x380 fs/ext4/super.c:7182 read_blk fs/quota/quota_tree.c:61 [inline] find_tree_dqentry+0x1cc/0xf40 fs/quota/quota_tree.c:671 find_tree_dqentry+0x6ac/0xf40 fs/quota/quota_tree.c:698 find_tree_dqentry+0x6ac/0xf40 fs/quota/quota_tree.c:698 find_tree_dqentry+0x6ac/0xf40 fs/quota/quota_tree.c:698 find_dqentry fs/quota/quota_tree.c:716 [inline] qtree_read_dquot+0x59a/0x880 fs/quota/quota_tree.c:736 v2_read_dquot+0xc0/0x110 fs/quota/quota_v2.c:336 dquot_acquire+0x152/0x520 fs/quota/dquot.c:491 ext4_acquire_dquot+0x2e3/0x4a0 fs/ext4/super.c:6837 dqget+0x713/0xbb0 fs/quota/dquot.c:1013 __dquot_initialize+0x324/0xd00 fs/quota/dquot.c:1542 ext4_process_orphan+0x4c/0x2e0 fs/ext4/orphan.c:327 ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693 get_tree_bdev+0x3e6/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f0a3959f10a Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0a3a49ae58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f0a3a49aee0 RCX: 00007f0a3959f10a RDX: 0000200000000040 RSI: 0000200000000780 RDI: 00007f0a3a49aea0 RBP: 0000200000000040 R08: 00007f0a3a49aee0 R09: 0000000000000041 R10: 0000000000000041 R11: 0000000000000246 R12: 0000200000000780 R13: 00007f0a3a49aea0 R14: 000000000000051c R15: 0000200000000840 EXT4-fs error (device loop4): ext4_read_block_bitmap_nowait:477: comm syz.4.2152: Invalid block bitmap block 0 in block_group 0 Quota error (device loop4): write_blk: dquota write failed Quota error (device loop4): qtree_write_dquot: Error -28 occurred while creating quota EXT4-fs error (device loop4): ext4_acquire_dquot:6841: comm syz.4.2152: Failed to acquire dquot type 1 EXT4-fs (loop4): 1 orphan inode deleted EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback. EXT4-fs error (device loop4): ext4_lookup:1862: inode #2: comm syz.4.2152: deleted inode referenced: 12