======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Not tainted
------------------------------------------------------
syz-executor257/3137 is trying to acquire lock:
ffff0000c4e1d728 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x34/0x1e4 fs/quota/dquot.c:479

but task is already holding lock:
ffff0000ca6b8c18 (&ei->i_data_sem/2){++++}-{3:3}, at: finish_range+0x7c/0x178 fs/ext4/migrate.c:36

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&ei->i_data_sem/2){++++}-{3:3}:
       down_read+0x5c/0x78 kernel/locking/rwsem.c:1499
       ext4_map_blocks+0x15c/0xaec fs/ext4/inode.c:568
       ext4_getblk+0xc4/0x448 fs/ext4/inode.c:858
       ext4_bread+0x3c/0x164 fs/ext4/inode.c:914
       ext4_quota_write+0x120/0x31c fs/ext4/super.c:6956
       write_blk fs/quota/quota_tree.c:64 [inline]
       get_free_dqblk+0xec/0x1a0 fs/quota/quota_tree.c:93
       do_insert_tree+0xdc/0x838 fs/quota/quota_tree.c:300
       do_insert_tree+0x24c/0x838 fs/quota/quota_tree.c:331
       do_insert_tree+0x24c/0x838 fs/quota/quota_tree.c:331
       do_insert_tree+0x24c/0x838 fs/quota/quota_tree.c:331
       dq_insert_tree fs/quota/quota_tree.c:357 [inline]
       qtree_write_dquot+0x188/0x204 fs/quota/quota_tree.c:376
       v2_write_dquot+0x70/0xb0 fs/quota/quota_v2.c:358
       dquot_acquire+0x158/0x23c fs/quota/dquot.c:444
       ext4_acquire_dquot+0xd4/0x11c fs/ext4/super.c:6612
       dqget+0x44c/0x5c0 fs/quota/dquot.c:914
       __dquot_initialize+0x1b8/0x588 fs/quota/dquot.c:1492
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1550
       __ext4_new_inode+0x2e8/0x1c74 fs/ext4/ialloc.c:993
       ext4_ext_migrate+0x1d8/0x63c fs/ext4/migrate.c:455
       __ext4_ioctl fs/ext4/ioctl.c:1388 [inline]
       ext4_ioctl+0xed0/0x236c fs/ext4/ioctl.c:1606
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl fs/ioctl.c:856 [inline]
       __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
       el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
       el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       down_read+0x5c/0x78 kernel/locking/rwsem.c:1499
       v2_read_dquot+0x28/0x64 fs/quota/quota_v2.c:332
       dquot_acquire+0x74/0x23c fs/quota/dquot.c:435
       ext4_acquire_dquot+0xd4/0x11c fs/ext4/super.c:6612
       dqget+0x44c/0x5c0 fs/quota/dquot.c:914
       __dquot_initialize+0x1b8/0x588 fs/quota/dquot.c:1492
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1550
       __ext4_new_inode+0x2e8/0x1c74 fs/ext4/ialloc.c:993
       ext4_ext_migrate+0x1d8/0x63c fs/ext4/migrate.c:455
       __ext4_ioctl fs/ext4/ioctl.c:1388 [inline]
       ext4_ioctl+0xed0/0x236c fs/ext4/ioctl.c:1606
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl fs/ioctl.c:856 [inline]
       __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
       el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
       el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

-> #0 (&dquot->dq_lock){+.+.}-{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:3829 [inline]
       __lock_acquire+0x1530/0x30a4 kernel/locking/lockdep.c:5053
       lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
       __mutex_lock_common+0xd4/0xca8 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+0x34/0x1e4 fs/quota/dquot.c:479
       ext4_write_dquot fs/ext4/super.c:6596 [inline]
       ext4_mark_dquot_dirty+0xdc/0x148 fs/ext4/super.c:6644
       mark_dquot_dirty fs/quota/dquot.c:346 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:384 [inline]
       __dquot_alloc_space+0x2a8/0x644 fs/quota/dquot.c:1722
       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+0x5fc/0x9e4 fs/ext4/mballoc.c:5574
       ext4_new_meta_blocks+0x84/0x140 fs/ext4/balloc.c:700
       ext4_ext_grow_indepth+0xd0/0x4c4 fs/ext4/extents.c:1325
       ext4_ext_create_new_leaf fs/ext4/extents.c:1431 [inline]
       ext4_ext_insert_extent+0x580/0xc5c fs/ext4/extents.c:2098
       finish_range+0x118/0x178 fs/ext4/migrate.c:56
       update_extent_range fs/ext4/migrate.c:83 [inline]
       ext4_ext_migrate+0x390/0x63c fs/ext4/migrate.c:513
       __ext4_ioctl fs/ext4/ioctl.c:1388 [inline]
       ext4_ioctl+0xed0/0x236c fs/ext4/ioctl.c:1606
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl fs/ioctl.c:856 [inline]
       __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
       el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
       el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

other info that might help us debug this:

Chain exists of:
  &dquot->dq_lock --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ei->i_data_sem/2);
                               lock(&s->s_dquot.dqio_sem);
                               lock(&ei->i_data_sem/2);
  lock(&dquot->dq_lock);

 *** DEADLOCK ***

5 locks held by syz-executor257/3137:
 #0: ffff0000c69d3460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x28/0xd8 fs/namespace.c:437
 #1: ffff0000ca6bb3d0 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff0000ca6bb3d0 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1387 [inline]
 #1: ffff0000ca6bb3d0 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: ext4_ioctl+0xec8/0x236c fs/ext4/ioctl.c:1606
 #2: ffff0000c69d2b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0xd4/0x63c fs/ext4/migrate.c:437
 #3: ffff0000ca6b8c18 (&ei->i_data_sem/2){++++}-{3:3}, at: finish_range+0x7c/0x178 fs/ext4/migrate.c:36
 #4: ffff80000d47ee98 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:279

stack backtrace:
CPU: 0 PID: 3137 Comm: syz-executor257 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156
 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 print_circular_bug+0x2c4/0x2c8 kernel/locking/lockdep.c:2053
 check_noncircular+0x14c/0x154 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3095 [inline]
 check_prevs_add kernel/locking/lockdep.c:3214 [inline]
 validate_chain kernel/locking/lockdep.c:3829 [inline]
 __lock_acquire+0x1530/0x30a4 kernel/locking/lockdep.c:5053
 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
 __mutex_lock_common+0xd4/0xca8 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+0x34/0x1e4 fs/quota/dquot.c:479
 ext4_write_dquot fs/ext4/super.c:6596 [inline]
 ext4_mark_dquot_dirty+0xdc/0x148 fs/ext4/super.c:6644
 mark_dquot_dirty fs/quota/dquot.c:346 [inline]
 mark_all_dquot_dirty fs/quota/dquot.c:384 [inline]
 __dquot_alloc_space+0x2a8/0x644 fs/quota/dquot.c:1722
 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+0x5fc/0x9e4 fs/ext4/mballoc.c:5574
 ext4_new_meta_blocks+0x84/0x140 fs/ext4/balloc.c:700
 ext4_ext_grow_indepth+0xd0/0x4c4 fs/ext4/extents.c:1325
 ext4_ext_create_new_leaf fs/ext4/extents.c:1431 [inline]
 ext4_ext_insert_extent+0x580/0xc5c fs/ext4/extents.c:2098
 finish_range+0x118/0x178 fs/ext4/migrate.c:56
 update_extent_range fs/ext4/migrate.c:83 [inline]
 ext4_ext_migrate+0x390/0x63c fs/ext4/migrate.c:513
 __ext4_ioctl fs/ext4/ioctl.c:1388 [inline]
 ext4_ioctl+0xed0/0x236c fs/ext4/ioctl.c:1606
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581