======================================================
WARNING: possible circular locking dependency detected
6.1.141-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.195/5174 is trying to acquire lock:
ffff0000df7e65e8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x50/0x1c4 fs/quota/dquot.c:507

but task is already holding lock:
ffff0000fbc69698 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x7c4/0x1770 fs/ext4/inode.c:672

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+0x5c/0x88 kernel/locking/rwsem.c:1573
       ext4_truncate+0x7bc/0x1078 fs/ext4/inode.c:4284
       ext4_setattr+0xda8/0x150c fs/ext4/inode.c:5630
       notify_change+0xb0c/0xdcc fs/attr.c:499
       do_truncate+0x178/0x1f0 fs/open.c:65
       do_sys_ftruncate+0x284/0x31c fs/open.c:193
       __do_sys_ftruncate fs/open.c:204 [inline]
       __se_sys_ftruncate fs/open.c:202 [inline]
       __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #4 (jbd2_handle){++++}-{0:0}:
       start_this_handle+0xfe0/0x122c fs/jbd2/transaction.c:463
       jbd2__journal_start+0x288/0x51c fs/jbd2/transaction.c:520
       jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:559
       ocfs2_start_trans+0x380/0x6c4 fs/ocfs2/journal.c:376
       ocfs2_shutdown_local_alloc+0x1ac/0x7e4 fs/ocfs2/localalloc.c:416
       ocfs2_dismount_volume+0x1f0/0x93c fs/ocfs2/super.c:1882
       ocfs2_put_super+0x108/0x390 fs/ocfs2/super.c:1609
       generic_shutdown_super+0x130/0x324 fs/super.c:501
       kill_block_super+0x70/0xdc fs/super.c:1470
       deactivate_locked_super+0xac/0x124 fs/super.c:332
       deactivate_super+0xe8/0x108 fs/super.c:363
       cleanup_mnt+0x37c/0x404 fs/namespace.c:1182
       __cleanup_mnt+0x20/0x30 fs/namespace.c:1189
       task_work_run+0x1ec/0x270 kernel/task_work.c:203
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137
       prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
       exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
       el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #3 (&journal->j_trans_barrier){.+.+}-{3:3}:
       down_read+0x64/0x304 kernel/locking/rwsem.c:1520
       ocfs2_start_trans+0x374/0x6c4 fs/ocfs2/journal.c:374
       ocfs2_shutdown_local_alloc+0x1ac/0x7e4 fs/ocfs2/localalloc.c:416
       ocfs2_dismount_volume+0x1f0/0x93c fs/ocfs2/super.c:1882
       ocfs2_put_super+0x108/0x390 fs/ocfs2/super.c:1609
       generic_shutdown_super+0x130/0x324 fs/super.c:501
       kill_block_super+0x70/0xdc fs/super.c:1470
       deactivate_locked_super+0xac/0x124 fs/super.c:332
       deactivate_super+0xe8/0x108 fs/super.c:363
       cleanup_mnt+0x37c/0x404 fs/namespace.c:1182
       __cleanup_mnt+0x20/0x30 fs/namespace.c:1189
       task_work_run+0x1ec/0x270 kernel/task_work.c:203
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137
       prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
       exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
       el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #2 (sb_internal#4){.+.+}-{0:0}:
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write include/linux/fs.h:1891 [inline]
       sb_start_intwrite include/linux/fs.h:2013 [inline]
       ocfs2_start_trans+0x20c/0x6c4 fs/ocfs2/journal.c:372
       ocfs2_acquire_dquot+0x5bc/0xac4 fs/ocfs2/quota_global.c:848
       dqget+0x654/0xccc fs/quota/dquot.c:988
       dquot_set_dqblk+0x40/0xe50 fs/quota/dquot.c:2833
       quota_setquota+0x400/0x490 fs/quota/quota.c:310
       do_quotactl+0x65c/0x738 fs/quota/quota.c:802
       __do_sys_quotactl fs/quota/quota.c:960 [inline]
       __se_sys_quotactl fs/quota/quota.c:916 [inline]
       __arm64_sys_quotactl+0x2ac/0x730 fs/quota/quota.c:916
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
       down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
       ocfs2_create_local_dquot+0x15c/0x1330 fs/ocfs2/quota_local.c:1224
       ocfs2_acquire_dquot+0x6e8/0xac4 fs/ocfs2/quota_global.c:871
       dqget+0x654/0xccc fs/quota/dquot.c:988
       dquot_set_dqblk+0x40/0xe50 fs/quota/dquot.c:2833
       quota_setquota+0x400/0x490 fs/quota/quota.c:310
       do_quotactl+0x65c/0x738 fs/quota/quota.c:802
       __do_sys_quotactl fs/quota/quota.c:960 [inline]
       __se_sys_quotactl fs/quota/quota.c:916 [inline]
       __arm64_sys_quotactl+0x2ac/0x730 fs/quota/quota.c:916
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain kernel/locking/lockdep.c:3825 [inline]
       __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049
       lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
       __mutex_lock_common+0x190/0x1f38 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
       dquot_commit+0x50/0x1c4 fs/quota/dquot.c:507
       ext4_write_dquot+0x1b4/0x31c fs/ext4/super.c:6790
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6867
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412
       __dquot_alloc_space+0x560/0xce8 fs/quota/dquot.c:1752
       dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline]
       dquot_alloc_space include/linux/quotaops.h:313 [inline]
       dquot_alloc_block include/linux/quotaops.h:337 [inline]
       ext4_mb_new_blocks+0xd30/0x435c fs/ext4/mballoc.c:5727
       ext4_ext_map_blocks+0x1018/0x559c fs/ext4/extents.c:4339
       ext4_map_blocks+0x860/0x1770 fs/ext4/inode.c:679
       ext4_getblk+0x170/0x654 fs/ext4/inode.c:890
       ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:946
       ext4_init_symlink_block fs/ext4/namei.c:3394 [inline]
       ext4_symlink+0x468/0x888 fs/ext4/namei.c:3471
       vfs_symlink+0x238/0x3b0 fs/namei.c:4471
       do_symlinkat+0x174/0x350 fs/namei.c:4500
       __do_sys_symlinkat fs/namei.c:4517 [inline]
       __se_sys_symlinkat fs/namei.c:4514 [inline]
       __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4514
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

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 ***

4 locks held by syz.1.195/5174:
 #0: ffff0000dc228460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:393
 #1: ffff0000f4e3d440 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
 #1: ffff0000f4e3d440 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x1ac/0x39c fs/namei.c:3876
 #2: ffff0000fbc69698 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x7c4/0x1770 fs/ext4/inode.c:672
 #3: ffff80001537d548 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:349

stack backtrace:
CPU: 0 PID: 5174 Comm: syz.1.195 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048
 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain kernel/locking/lockdep.c:3825 [inline]
 __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 __mutex_lock_common+0x190/0x1f38 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 dquot_commit+0x50/0x1c4 fs/quota/dquot.c:507
 ext4_write_dquot+0x1b4/0x31c fs/ext4/super.c:6790
 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6867
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412
 __dquot_alloc_space+0x560/0xce8 fs/quota/dquot.c:1752
 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline]
 dquot_alloc_space include/linux/quotaops.h:313 [inline]
 dquot_alloc_block include/linux/quotaops.h:337 [inline]
 ext4_mb_new_blocks+0xd30/0x435c fs/ext4/mballoc.c:5727
 ext4_ext_map_blocks+0x1018/0x559c fs/ext4/extents.c:4339
 ext4_map_blocks+0x860/0x1770 fs/ext4/inode.c:679
 ext4_getblk+0x170/0x654 fs/ext4/inode.c:890
 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:946
 ext4_init_symlink_block fs/ext4/namei.c:3394 [inline]
 ext4_symlink+0x468/0x888 fs/ext4/namei.c:3471
 vfs_symlink+0x238/0x3b0 fs/namei.c:4471
 do_symlinkat+0x174/0x350 fs/namei.c:4500
 __do_sys_symlinkat fs/namei.c:4517 [inline]
 __se_sys_symlinkat fs/namei.c:4514 [inline]
 __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4514
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585