======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.179/4751 is trying to acquire lock:
ffff88807298ece8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x5a/0x410 fs/quota/dquot.c:535

but task is already holding lock:
ffff888061c35cd0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x9ae/0x12a0 fs/ext4/inode.c:4297

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+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_write+0x237/0x580 fs/ext4/super.c:7228
       write_blk fs/quota/quota_tree.c:70 [inline]
       get_free_dqblk+0x2dc/0x630 fs/quota/quota_tree.c:136
       do_insert_tree+0x22b/0x1060 fs/quota/quota_tree.c:347
       do_insert_tree+0x9f5/0x1060 fs/quota/quota_tree.c:402
       dq_insert_tree fs/quota/quota_tree.c:432 [inline]
       qtree_write_dquot+0x49b/0x5d0 fs/quota/quota_tree.c:451
       v2_write_dquot+0x108/0x190 fs/quota/quota_v2.c:361
       dquot_acquire+0x2d5/0x520 fs/quota/dquot.c:500
       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+0xdfe/0x1650 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:1377
       vfs_get_tree+0x88/0x270 fs/super.c:1584
       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 (&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+0xdfe/0x1650 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:1377
       vfs_get_tree+0x88/0x270 fs/super.c:1584
       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

-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3162 [inline]
       check_prevs_add kernel/locking/lockdep.c:3281 [inline]
       validate_chain kernel/locking/lockdep.c:3897 [inline]
       __lock_acquire+0x3a03/0x7ea0 kernel/locking/lockdep.c:5171
       lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790
       __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
       ext4_orphan_cleanup+0xdfe/0x1650 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:1377
       vfs_get_tree+0x88/0x270 fs/super.c:1584
       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:
  &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 ***

4 locks held by syz.0.179/4751:
 #0: ffff888024c1e0e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x1fb/0x930 fs/super.c:228
 #1: ffff888024c1e650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
 #1: ffff888024c1e650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2019 [inline]
 #1: ffff888024c1e650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x431/0x10e0 fs/ext4/inode.c:242
 #2: ffff888061c35cd0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x9ae/0x12a0 fs/ext4/inode.c:4297
 #3: ffffffff8da74c48 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #3: ffffffff8da74c48 (dquot_srcu){....}-{0:0}, at: srcu_read_lock include/linux/srcu.h:165 [inline]
 #3: ffffffff8da74c48 (dquot_srcu){....}-{0:0}, at: __dquot_free_space+0x172/0xbc0 fs/quota/dquot.c:1940

stack backtrace:
CPU: 0 PID: 4751 Comm: syz.0.179 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 check_noncircular+0x2f8/0x400 kernel/locking/lockdep.c:2215
 check_prev_add kernel/locking/lockdep.c:3162 [inline]
 check_prevs_add kernel/locking/lockdep.c:3281 [inline]
 validate_chain kernel/locking/lockdep.c:3897 [inline]
 __lock_acquire+0x3a03/0x7ea0 kernel/locking/lockdep.c:5171
 lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790
 __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
 ext4_orphan_cleanup+0xdfe/0x1650 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:1377
 vfs_get_tree+0x88/0x270 fs/super.c:1584
 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: 0033:0x7f171259f44a
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:00007fffd70d8c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fffd70d8d00 RCX: 00007f171259f44a
RDX: 0000200000000040 RSI: 0000200000000500 RDI: 00007fffd70d8cc0
RBP: 0000200000000040 R08: 00007fffd70d8d00 R09: 0000000000004500
R10: 0000000000004500 R11: 0000000000000246 R12: 0000200000000500
R13: 00007fffd70d8cc0 R14: 00000000000004b4 R15: 000000000000002c
 </TASK>
EXT4-fs (loop0): 1 orphan inode deleted
ext4 filesystem being mounted at /162/file1 supports timestamps until 2038-01-19 (0x7fffffff)