======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:3/4282 is trying to acquire lock:
ffff888061b6e990 (jbd2_handle){++++}-{0:0}, at: wait_transaction_locked+0x19f/0x270 fs/jbd2/transaction.c:178

but task is already holding lock:
ffff88802d1178e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&journal->j_trans_barrier){.+.+}-{3:3}:
       down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
       ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374
       ocfs2_modify_bh+0xe0/0x4c0 fs/ocfs2/quota_local.c:101
       ocfs2_local_read_info+0x1499/0x1820 fs/ocfs2/quota_local.c:764
       dquot_load_quota_sb+0x72f/0xa80 fs/quota/dquot.c:2485
       dquot_load_quota_inode+0x2d3/0x5c0 fs/quota/dquot.c:2522
       ocfs2_enable_quotas+0x1c0/0x4a0 fs/ocfs2/super.c:927
       ocfs2_fill_super+0x3c84/0x50a0 fs/ocfs2/super.c:1140
       mount_bdev+0x28a/0x3c0 fs/super.c:1411
       legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
       vfs_get_tree+0x88/0x270 fs/super.c:1541
       do_new_mount+0x247/0xa40 fs/namespace.c:3034
       do_mount fs/namespace.c:3377 [inline]
       __do_sys_mount fs/namespace.c:3585 [inline]
       __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
       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

-> #4 (sb_internal#2){.+.+}-{0:0}:
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write include/linux/fs.h:1817 [inline]
       sb_start_intwrite include/linux/fs.h:1934 [inline]
       ocfs2_start_trans+0x2a7/0x6f0 fs/ocfs2/journal.c:372
       ocfs2_acquire_dquot+0x6c0/0xb30 fs/ocfs2/quota_global.c:848
       dqget+0x713/0xbb0 fs/quota/dquot.c:1010
       __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1539
       ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0x90e/0x2460 fs/ocfs2/namei.c:311
       ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:676
       lookup_open fs/namei.c:3513 [inline]
       open_last_lookups fs/namei.c:3583 [inline]
       path_openat+0x120a/0x2fb0 fs/namei.c:3790
       do_filp_open+0x1df/0x400 fs/namei.c:3820
       do_sys_openat2+0x14b/0x500 fs/open.c:1255
       do_sys_open fs/open.c:1271 [inline]
       __do_sys_open fs/open.c:1279 [inline]
       __se_sys_open fs/open.c:1275 [inline]
       __x64_sys_open+0x11b/0x140 fs/open.c:1275
       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 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
       down_write+0x38/0x60 kernel/locking/rwsem.c:1551
       ocfs2_create_local_dquot+0x199/0x18d0 fs/ocfs2/quota_local.c:1224
       ocfs2_acquire_dquot+0x822/0xb30 fs/ocfs2/quota_global.c:871
       dqget+0x713/0xbb0 fs/quota/dquot.c:1010
       __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1539
       ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0x90e/0x2460 fs/ocfs2/namei.c:311
       ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:676
       lookup_open fs/namei.c:3513 [inline]
       open_last_lookups fs/namei.c:3583 [inline]
       path_openat+0x120a/0x2fb0 fs/namei.c:3790
       do_filp_open+0x1df/0x400 fs/namei.c:3820
       do_sys_openat2+0x14b/0x500 fs/open.c:1255
       do_sys_open fs/open.c:1271 [inline]
       __do_sys_open fs/open.c:1279 [inline]
       __se_sys_open fs/open.c:1275 [inline]
       __x64_sys_open+0x11b/0x140 fs/open.c:1275
       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 (&dquot->dq_lock){+.+.}-{3:3}:
       __mutex_lock_common+0x1e5/0x2400 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:532
       ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6212
       mark_dquot_dirty fs/quota/dquot.c:397 [inline]
       mark_all_dquot_dirty+0x1e3/0x400 fs/quota/dquot.c:437
       __dquot_alloc_space+0x5cb/0xe10 fs/quota/dquot.c:1774
       dquot_alloc_space_nodirty include/linux/quotaops.h:290 [inline]
       dquot_alloc_space include/linux/quotaops.h:303 [inline]
       dquot_alloc_block include/linux/quotaops.h:327 [inline]
       ext4_mb_new_blocks+0xf80/0x47c0 fs/ext4/mballoc.c:5750
       ext4_ext_map_blocks+0x17d1/0x63d0 fs/ext4/extents.c:4372
       ext4_map_blocks+0x97f/0x1a50 fs/ext4/inode.c:675
       ext4_getblk+0x176/0x670 fs/ext4/inode.c:872
       ext4_bread+0x26/0x180 fs/ext4/inode.c:925
       ext4_append+0x2bb/0x560 fs/ext4/namei.c:83
       ext4_add_entry+0xb61/0x1020 fs/ext4/namei.c:2513
       ext4_add_nondir+0x93/0x270 fs/ext4/namei.c:2847
       ext4_create+0x2f3/0x470 fs/ext4/namei.c:2893
       lookup_open fs/namei.c:3513 [inline]
       open_last_lookups fs/namei.c:3583 [inline]
       path_openat+0x120a/0x2fb0 fs/namei.c:3790
       do_filp_open+0x1df/0x400 fs/namei.c:3820
       do_sys_openat2+0x14b/0x500 fs/open.c:1255
       do_sys_open fs/open.c:1271 [inline]
       __do_sys_openat fs/open.c:1287 [inline]
       __se_sys_openat fs/open.c:1282 [inline]
       __x64_sys_openat+0x135/0x160 fs/open.c:1282
       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 (&ei->i_data_sem){++++}-{3:3}:
       down_write+0x38/0x60 kernel/locking/rwsem.c:1551
       ext4_map_blocks+0x8c4/0x1a50 fs/ext4/inode.c:668
       mpage_map_one_extent fs/ext4/inode.c:2410 [inline]
       mpage_map_and_submit_extent fs/ext4/inode.c:2463 [inline]
       ext4_writepages+0x124a/0x2d40 fs/ext4/inode.c:2831
       do_writepages+0x493/0x700 mm/page-writeback.c:2386
       __writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1657
       writeback_sb_inodes+0xaaa/0x1750 fs/fs-writeback.c:1940
       __writeback_inodes_wb+0x12a/0x3f0 fs/fs-writeback.c:2011
       wb_writeback+0x45e/0xbc0 fs/fs-writeback.c:2116
       wb_check_background_flush fs/fs-writeback.c:2182 [inline]
       wb_do_writeback fs/fs-writeback.c:2270 [inline]
       wb_workfn+0xbd6/0xf20 fs/fs-writeback.c:2298
       process_one_work+0x867/0xff0 kernel/workqueue.c:2310
       worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
       kthread+0x42e/0x520 kernel/kthread.c:334
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

-> #0 (jbd2_handle){++++}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3120 [inline]
       check_prevs_add kernel/locking/lockdep.c:3239 [inline]
       validate_chain kernel/locking/lockdep.c:3855 [inline]
       __lock_acquire+0x38f7/0x7d40 kernel/locking/lockdep.c:5120
       lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
       wait_transaction_locked+0x1bb/0x270 fs/jbd2/transaction.c:178
       add_transaction_credits+0x104/0xcb0 fs/jbd2/transaction.c:242
       start_this_handle+0x723/0x1560 fs/jbd2/transaction.c:423
       jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:521
       jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:560
       ocfs2_start_trans+0x3b2/0x6f0 fs/ocfs2/journal.c:376
       ocfs2_release_dquot+0x458/0xb60 fs/ocfs2/quota_global.c:749
       quota_release_workfn+0x361/0x5e0 fs/quota/dquot.c:872
       process_one_work+0x867/0xff0 kernel/workqueue.c:2310
       worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
       kthread+0x42e/0x520 kernel/kthread.c:334
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

other info that might help us debug this:

Chain exists of:
  jbd2_handle --> sb_internal#2 --> &journal->j_trans_barrier

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&journal->j_trans_barrier);
                               lock(sb_internal#2);
                               lock(&journal->j_trans_barrier);
  lock(jbd2_handle);

 *** DEADLOCK ***

7 locks held by kworker/u4:3/4282:
 #0: ffff888017879138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc90002fffd00 ((quota_release_work).work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: ffff8880545ebca8 (&dquot->dq_lock){+.+.}-{3:3}, at: ocfs2_release_dquot+0x231/0xb60 fs/ocfs2/quota_global.c:729
 #3: ffff888070e509c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
 #3: ffff888070e509c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: ocfs2_lock_global_qf+0x1d7/0x290 fs/ocfs2/quota_global.c:313
 #4: ffff888070e50660 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1fe/0x290 fs/ocfs2/quota_global.c:314
 #5: ffff888078844650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_release_dquot+0x458/0xb60 fs/ocfs2/quota_global.c:749
 #6: ffff88802d1178e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374

stack backtrace:
CPU: 1 PID: 4282 Comm: kworker/u4:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events_unbound quota_release_workfn
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 check_noncircular+0x2f8/0x400 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3120 [inline]
 check_prevs_add kernel/locking/lockdep.c:3239 [inline]
 validate_chain kernel/locking/lockdep.c:3855 [inline]
 __lock_acquire+0x38f7/0x7d40 kernel/locking/lockdep.c:5120
 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
 wait_transaction_locked+0x1bb/0x270 fs/jbd2/transaction.c:178
 add_transaction_credits+0x104/0xcb0 fs/jbd2/transaction.c:242
 start_this_handle+0x723/0x1560 fs/jbd2/transaction.c:423
 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:521
 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:560
 ocfs2_start_trans+0x3b2/0x6f0 fs/ocfs2/journal.c:376
 ocfs2_release_dquot+0x458/0xb60 fs/ocfs2/quota_global.c:749
 quota_release_workfn+0x361/0x5e0 fs/quota/dquot.c:872
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>