EXT4-fs error (device loop5): ext4_mb_generate_buddy:1147: group 0, block bitmap and bg descriptor inconsistent: 96 vs 65376 free clusters
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz-executor/4677 is trying to acquire lock:
ffff88805a1ec0a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x5a/0x410 fs/quota/dquot.c:507

but task is already holding lock:
ffff8880731c1668 (&ei->i_data_sem){++++}-{3:3}, at: ext4_truncate+0x96d/0x10d0 fs/ext4/inode.c:4245

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&ei->i_data_sem){++++}-{3:3}:
       down_write+0x38/0x60 kernel/locking/rwsem.c:1551
       ext4_map_blocks+0x8b2/0x1b30 fs/ext4/inode.c:666
       mpage_map_one_extent fs/ext4/inode.c:2408 [inline]
       mpage_map_and_submit_extent fs/ext4/inode.c:2461 [inline]
       ext4_writepages+0x12ca/0x2d20 fs/ext4/inode.c:2829
       do_writepages+0x48d/0x6d0 mm/page-writeback.c:2386
       __writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1647
       writeback_sb_inodes+0x9fe/0x1610 fs/fs-writeback.c:1930
       __writeback_inodes_wb+0x12a/0x3f0 fs/fs-writeback.c:2001
       wb_writeback+0x455/0xb90 fs/fs-writeback.c:2106
       wb_check_background_flush fs/fs-writeback.c:2172 [inline]
       wb_do_writeback fs/fs-writeback.c:2260 [inline]
       wb_workfn+0xb47/0xe60 fs/fs-writeback.c:2288
       process_one_work+0x863/0x1000 kernel/workqueue.c:2310
       worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
       kthread+0x436/0x520 kernel/kthread.c:334
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

-> #4 (jbd2_handle){++++}-{0:0}:
       start_this_handle+0x1338/0x15a0 fs/jbd2/transaction.c:464
       jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:521
       jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:560
       ocfs2_start_trans+0x374/0x6c0 fs/ocfs2/journal.c:376
       ocfs2_modify_bh+0xe5/0x470 fs/ocfs2/quota_local.c:101
       ocfs2_local_read_info+0x13b1/0x16e0 fs/ocfs2/quota_local.c:764
       dquot_load_quota_sb+0x756/0xac0 fs/quota/dquot.c:2463
       dquot_load_quota_inode+0x2d8/0x5d0 fs/quota/dquot.c:2500
       ocfs2_enable_quotas+0x1c3/0x440 fs/ocfs2/super.c:927
       ocfs2_fill_super+0x3a1f/0x4d80 fs/ocfs2/super.c:1140
       mount_bdev+0x287/0x3c0 fs/super.c:1400
       legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
       vfs_get_tree+0x88/0x270 fs/super.c:1530
       do_new_mount+0x24a/0xa40 fs/namespace.c:3025
       do_mount fs/namespace.c:3368 [inline]
       __do_sys_mount fs/namespace.c:3576 [inline]
       __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3553
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #3 (&journal->j_trans_barrier){.+.+}-{3:3}:
       down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
       ocfs2_start_trans+0x368/0x6c0 fs/ocfs2/journal.c:374
       ocfs2_modify_bh+0xe5/0x470 fs/ocfs2/quota_local.c:101
       ocfs2_local_read_info+0x13b1/0x16e0 fs/ocfs2/quota_local.c:764
       dquot_load_quota_sb+0x756/0xac0 fs/quota/dquot.c:2463
       dquot_load_quota_inode+0x2d8/0x5d0 fs/quota/dquot.c:2500
       ocfs2_enable_quotas+0x1c3/0x440 fs/ocfs2/super.c:927
       ocfs2_fill_super+0x3a1f/0x4d80 fs/ocfs2/super.c:1140
       mount_bdev+0x287/0x3c0 fs/super.c:1400
       legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
       vfs_get_tree+0x88/0x270 fs/super.c:1530
       do_new_mount+0x24a/0xa40 fs/namespace.c:3025
       do_mount fs/namespace.c:3368 [inline]
       __do_sys_mount fs/namespace.c:3576 [inline]
       __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3553
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #2 (sb_internal#2){.+.+}-{0:0}:
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write include/linux/fs.h:1811 [inline]
       sb_start_intwrite include/linux/fs.h:1928 [inline]
       ocfs2_start_trans+0x269/0x6c0 fs/ocfs2/journal.c:372
       ocfs2_acquire_dquot+0x677/0xaf0 fs/ocfs2/quota_global.c:848
       dqget+0x778/0xeb0 fs/quota/dquot.c:988
       __dquot_initialize+0x3b6/0xcb0 fs/quota/dquot.c:1517
       ocfs2_get_init_inode+0x138/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0x8aa/0x22b0 fs/ocfs2/namei.c:310
       ocfs2_create+0x192/0x410 fs/ocfs2/namei.c:674
       lookup_open fs/namei.c:3462 [inline]
       open_last_lookups fs/namei.c:3532 [inline]
       path_openat+0x11e1/0x2f30 fs/namei.c:3739
       do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
       do_sys_openat2+0x142/0x4a0 fs/open.c:1253
       do_sys_open fs/open.c:1269 [inline]
       __do_sys_openat fs/open.c:1285 [inline]
       __se_sys_openat fs/open.c:1280 [inline]
       __x64_sys_openat+0x135/0x160 fs/open.c:1280
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
       down_write+0x38/0x60 kernel/locking/rwsem.c:1551
       ocfs2_create_local_dquot+0x194/0x1750 fs/ocfs2/quota_local.c:1224
       ocfs2_acquire_dquot+0x7cb/0xaf0 fs/ocfs2/quota_global.c:871
       dqget+0x778/0xeb0 fs/quota/dquot.c:988
       __dquot_initialize+0x3b6/0xcb0 fs/quota/dquot.c:1517
       ocfs2_get_init_inode+0x138/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0x8aa/0x22b0 fs/ocfs2/namei.c:310
       ocfs2_create+0x192/0x410 fs/ocfs2/namei.c:674
       lookup_open fs/namei.c:3462 [inline]
       open_last_lookups fs/namei.c:3532 [inline]
       path_openat+0x11e1/0x2f30 fs/namei.c:3739
       do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
       do_sys_openat2+0x142/0x4a0 fs/open.c:1253
       do_sys_open fs/open.c:1269 [inline]
       __do_sys_openat fs/open.c:1285 [inline]
       __se_sys_openat fs/open.c:1280 [inline]
       __x64_sys_openat+0x135/0x160 fs/open.c:1280
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3053 [inline]
       check_prevs_add kernel/locking/lockdep.c:3172 [inline]
       validate_chain kernel/locking/lockdep.c:3788 [inline]
       __lock_acquire+0x2c33/0x7c60 kernel/locking/lockdep.c:5012
       lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
       __mutex_lock_common+0x1eb/0x2390 kernel/locking/mutex.c:596
       __mutex_lock kernel/locking/mutex.c:729 [inline]
       mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
       dquot_commit+0x5a/0x410 fs/quota/dquot.c:507
       ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6185
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412
       __dquot_free_space+0x7ca/0xb90 fs/quota/dquot.c:1942
       dquot_free_space_nodirty include/linux/quotaops.h:376 [inline]
       dquot_free_space include/linux/quotaops.h:381 [inline]
       dquot_free_block include/linux/quotaops.h:392 [inline]
       ext4_mb_clear_bb fs/ext4/mballoc.c:6151 [inline]
       ext4_free_blocks+0x1af5/0x2480 fs/ext4/mballoc.c:6281
       ext4_remove_blocks fs/ext4/extents.c:2525 [inline]
       ext4_ext_rm_leaf fs/ext4/extents.c:2691 [inline]
       ext4_ext_remove_space+0x1eaa/0x43a0 fs/ext4/extents.c:2939
       ext4_ext_truncate+0x192/0x240 fs/ext4/extents.c:4473
       ext4_truncate+0x9f1/0x10d0 fs/ext4/inode.c:4250
       ext4_evict_inode+0xb43/0x1080 fs/ext4/inode.c:289
       evict+0x485/0x870 fs/inode.c:647
       d_delete_notify include/linux/fsnotify.h:267 [inline]
       vfs_rmdir+0x3b4/0x430 fs/namei.c:4162
       do_rmdir+0x295/0x710 fs/namei.c:4210
       __do_sys_unlinkat fs/namei.c:4390 [inline]
       __se_sys_unlinkat fs/namei.c:4384 [inline]
       __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4384
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

other info that might help us debug this:

Chain exists of:
  &dquot->dq_lock --> jbd2_handle --> &ei->i_data_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ei->i_data_sem);
                               lock(jbd2_handle);
                               lock(&ei->i_data_sem);
  lock(&dquot->dq_lock);

 *** DEADLOCK ***

5 locks held by syz-executor/4677:
 #0: ffff8880735d6460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:377
 #1: ffff8880731c53b0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #1: ffff8880731c53b0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: do_rmdir+0x1b2/0x710 fs/namei.c:4197
 #2: ffff8880735d6650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1811 [inline]
 #2: ffff8880735d6650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1928 [inline]
 #2: ffff8880735d6650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x444/0x1080 fs/ext4/inode.c:243
 #3: ffff8880731c1668 (&ei->i_data_sem){++++}-{3:3}, at: ext4_truncate+0x96d/0x10d0 fs/ext4/inode.c:4245
 #4: ffffffff8c23ee98 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311

stack backtrace:
CPU: 1 PID: 4677 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2133
 check_prev_add kernel/locking/lockdep.c:3053 [inline]
 check_prevs_add kernel/locking/lockdep.c:3172 [inline]
 validate_chain kernel/locking/lockdep.c:3788 [inline]
 __lock_acquire+0x2c33/0x7c60 kernel/locking/lockdep.c:5012
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 __mutex_lock_common+0x1eb/0x2390 kernel/locking/mutex.c:596
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 dquot_commit+0x5a/0x410 fs/quota/dquot.c:507
 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6185
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412
 __dquot_free_space+0x7ca/0xb90 fs/quota/dquot.c:1942
 dquot_free_space_nodirty include/linux/quotaops.h:376 [inline]
 dquot_free_space include/linux/quotaops.h:381 [inline]
 dquot_free_block include/linux/quotaops.h:392 [inline]
 ext4_mb_clear_bb fs/ext4/mballoc.c:6151 [inline]
 ext4_free_blocks+0x1af5/0x2480 fs/ext4/mballoc.c:6281
 ext4_remove_blocks fs/ext4/extents.c:2525 [inline]
 ext4_ext_rm_leaf fs/ext4/extents.c:2691 [inline]
 ext4_ext_remove_space+0x1eaa/0x43a0 fs/ext4/extents.c:2939
 ext4_ext_truncate+0x192/0x240 fs/ext4/extents.c:4473
 ext4_truncate+0x9f1/0x10d0 fs/ext4/inode.c:4250
 ext4_evict_inode+0xb43/0x1080 fs/ext4/inode.c:289
 evict+0x485/0x870 fs/inode.c:647
 d_delete_notify include/linux/fsnotify.h:267 [inline]
 vfs_rmdir+0x3b4/0x430 fs/namei.c:4162
 do_rmdir+0x295/0x710 fs/namei.c:4210
 __do_sys_unlinkat fs/namei.c:4390 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4384
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbdff817187
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe88ea9728 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fbdff817187
RDX: 0000000000000200 RSI: 00007ffe88eaa8d0 RDI: 00000000ffffff9c
RBP: 00007fbdff89ac05 R08: 0000555556e1666b R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffe88eaa8d0
R13: 00007fbdff89ac05 R14: 00000000000161b6 R15: 00007ffe88eaca90
 </TASK>