======================================================
WARNING: possible circular locking dependency detected
5.15.0-rc2-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.5/4154 is trying to acquire lock:
ffff88808acf07a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x4d/0x420 fs/quota/dquot.c:474

but task is already holding lock:
ffff88808aed8278 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x5e1/0x17d0 fs/ext4/inode.c:630

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+0x9a/0x440 kernel/locking/rwsem.c:1464
       ext4_map_blocks+0x381/0x17d0 fs/ext4/inode.c:560
       ext4_getblk+0x144/0x6b0 fs/ext4/inode.c:847
       ext4_bread+0x2a/0x1c0 fs/ext4/inode.c:900
       ext4_quota_write+0x26d/0x690 fs/ext4/super.c:6470
       write_blk+0x12e/0x220 fs/quota/quota_tree.c:64
       get_free_dqblk+0x104/0x2c0 fs/quota/quota_tree.c:93
       do_insert_tree+0x63a/0x11f0 fs/quota/quota_tree.c:300
       do_insert_tree+0xd90/0x11f0 fs/quota/quota_tree.c:331
       do_insert_tree+0xd90/0x11f0 fs/quota/quota_tree.c:331
       do_insert_tree+0xd90/0x11f0 fs/quota/quota_tree.c:331
       dq_insert_tree fs/quota/quota_tree.c:357 [inline]
       qtree_write_dquot+0x3b0/0x570 fs/quota/quota_tree.c:376
       v2_write_dquot+0x11c/0x250 fs/quota/quota_v2.c:358
       dquot_acquire+0x2c5/0x590 fs/quota/dquot.c:441
       ext4_acquire_dquot+0x254/0x3b0 fs/ext4/super.c:6139
       dqget+0x679/0x1080 fs/quota/dquot.c:899
       __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1477
       ext4_create+0x90/0x4d0 fs/ext4/namei.c:2739
       lookup_open.isra.0+0xfe4/0x13d0 fs/namei.c:3282
       open_last_lookups fs/namei.c:3352 [inline]
       path_openat+0x9a5/0x2740 fs/namei.c:3558
       do_filp_open+0x1aa/0x400 fs/namei.c:3588
       do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
       do_sys_open fs/open.c:1216 [inline]
       __do_sys_creat fs/open.c:1290 [inline]
       __se_sys_creat fs/open.c:1284 [inline]
       __x64_sys_creat+0xc9/0x120 fs/open.c:1284
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x44/0xae

-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       down_read+0x9a/0x440 kernel/locking/rwsem.c:1464
       v2_read_dquot+0x49/0x120 fs/quota/quota_v2.c:332
       dquot_acquire+0x12e/0x590 fs/quota/dquot.c:432
       ext4_acquire_dquot+0x254/0x3b0 fs/ext4/super.c:6139
       dqget+0x679/0x1080 fs/quota/dquot.c:899
       __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1477
       ext4_create+0x90/0x4d0 fs/ext4/namei.c:2739
       lookup_open.isra.0+0xfe4/0x13d0 fs/namei.c:3282
       open_last_lookups fs/namei.c:3352 [inline]
       path_openat+0x9a5/0x2740 fs/namei.c:3558
       do_filp_open+0x1aa/0x400 fs/namei.c:3588
       do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
       do_sys_open fs/open.c:1216 [inline]
       __do_sys_creat fs/open.c:1290 [inline]
       __se_sys_creat fs/open.c:1284 [inline]
       __x64_sys_creat+0xc9/0x120 fs/open.c:1284
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x44/0xae

-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3051 [inline]
       check_prevs_add kernel/locking/lockdep.c:3174 [inline]
       validate_chain kernel/locking/lockdep.c:3789 [inline]
       __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015
       lock_acquire kernel/locking/lockdep.c:5625 [inline]
       lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
       __mutex_lock_common kernel/locking/mutex.c:596 [inline]
       __mutex_lock+0x131/0x12f0 kernel/locking/mutex.c:729
       dquot_commit+0x4d/0x420 fs/quota/dquot.c:474
       ext4_write_dquot+0x24e/0x310 fs/ext4/super.c:6123
       ext4_mark_dquot_dirty fs/ext4/super.c:6171 [inline]
       ext4_mark_dquot_dirty+0x111/0x1b0 fs/ext4/super.c:6165
       mark_dquot_dirty fs/quota/dquot.c:345 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:383 [inline]
       __dquot_alloc_space+0x5d4/0xb60 fs/quota/dquot.c:1707
       dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline]
       dquot_alloc_space include/linux/quotaops.h:310 [inline]
       dquot_alloc_block include/linux/quotaops.h:334 [inline]
       ext4_mb_new_blocks+0x5b3/0x5230 fs/ext4/mballoc.c:5548
       ext4_ext_map_blocks+0x1fa4/0x6140 fs/ext4/extents.c:4250
       ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637
       _ext4_get_block+0x241/0x590 fs/ext4/inode.c:793
       __block_write_begin_int+0x43e/0x1810 fs/buffer.c:2006
       ext4_convert_inline_data_to_extent fs/ext4/inline.c:596 [inline]
       ext4_try_to_write_inline_data+0x739/0x1920 fs/ext4/inline.c:729
       ext4_write_begin+0xd4e/0x14c0 fs/ext4/inode.c:1158
       ext4_da_write_begin+0x686/0x11c0 fs/ext4/inode.c:2966
       generic_perform_write+0x202/0x510 mm/filemap.c:3770
       ext4_buffered_write_iter+0x244/0x500 fs/ext4/file.c:269
       ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680
       call_write_iter include/linux/fs.h:2163 [inline]
       new_sync_write+0x429/0x660 fs/read_write.c:507
       vfs_write+0x7cf/0xae0 fs/read_write.c:594
       ksys_write+0x12d/0x250 fs/read_write.c:647
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x44/0xae

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 ***

6 locks held by syz-executor.5/4154:
 #0: ffff88807381b270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
 #1: ffff88806e49e460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x12d/0x250 fs/read_write.c:647
 #2: ffff88808aed83f0 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline]
 #2: ffff88808aed83f0 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: ext4_buffered_write_iter+0xb6/0x500 fs/ext4/file.c:263
 #3: ffff88808aed80c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline]
 #3: ffff88808aed80c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data_to_extent fs/ext4/inline.c:572 [inline]
 #3: ffff88808aed80c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_write_inline_data+0x2f9/0x1920 fs/ext4/inline.c:729
 #4: ffff88808aed8278 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x5e1/0x17d0 fs/ext4/inode.c:630
 #5: ffffffff8bb3d438 (dquot_srcu){....}-{0:0}, at: i_dquot fs/quota/dquot.c:924 [inline]
 #5: ffffffff8bb3d438 (dquot_srcu){....}-{0:0}, at: __dquot_alloc_space+0x1b4/0xb60 fs/quota/dquot.c:1669

stack backtrace:
CPU: 1 PID: 4154 Comm: syz-executor.5 Not tainted 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2131
 check_prev_add kernel/locking/lockdep.c:3051 [inline]
 check_prevs_add kernel/locking/lockdep.c:3174 [inline]
 validate_chain kernel/locking/lockdep.c:3789 [inline]
 __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015
 lock_acquire kernel/locking/lockdep.c:5625 [inline]
 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
 __mutex_lock_common kernel/locking/mutex.c:596 [inline]
 __mutex_lock+0x131/0x12f0 kernel/locking/mutex.c:729
 dquot_commit+0x4d/0x420 fs/quota/dquot.c:474
 ext4_write_dquot+0x24e/0x310 fs/ext4/super.c:6123
 ext4_mark_dquot_dirty fs/ext4/super.c:6171 [inline]
 ext4_mark_dquot_dirty+0x111/0x1b0 fs/ext4/super.c:6165
 mark_dquot_dirty fs/quota/dquot.c:345 [inline]
 mark_all_dquot_dirty fs/quota/dquot.c:383 [inline]
 __dquot_alloc_space+0x5d4/0xb60 fs/quota/dquot.c:1707
 dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline]
 dquot_alloc_space include/linux/quotaops.h:310 [inline]
 dquot_alloc_block include/linux/quotaops.h:334 [inline]
 ext4_mb_new_blocks+0x5b3/0x5230 fs/ext4/mballoc.c:5548
 ext4_ext_map_blocks+0x1fa4/0x6140 fs/ext4/extents.c:4250
 ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637
 _ext4_get_block+0x241/0x590 fs/ext4/inode.c:793
 __block_write_begin_int+0x43e/0x1810 fs/buffer.c:2006
 ext4_convert_inline_data_to_extent fs/ext4/inline.c:596 [inline]
 ext4_try_to_write_inline_data+0x739/0x1920 fs/ext4/inline.c:729
 ext4_write_begin+0xd4e/0x14c0 fs/ext4/inode.c:1158
 ext4_da_write_begin+0x686/0x11c0 fs/ext4/inode.c:2966
 generic_perform_write+0x202/0x510 mm/filemap.c:3770
 ext4_buffered_write_iter+0x244/0x500 fs/ext4/file.c:269
 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680
 call_write_iter include/linux/fs.h:2163 [inline]
 new_sync_write+0x429/0x660 fs/read_write.c:507
 vfs_write+0x7cf/0xae0 fs/read_write.c:594
 ksys_write+0x12d/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f386f5d7739
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f386cb4e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f386f6dbf80 RCX: 00007f386f5d7739
RDX: 000000000d4ba0ff RSI: 00000000200009c0 RDI: 0000000000000004
RBP: 00007f386f631cc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f386f6dbf80
R13: 00007ffc166eda8f R14: 00007f386cb4e300 R15: 0000000000022000
EXT4-fs error (device loop5): ext4_mb_generate_buddy:1141: group 0, block bitmap and bg descriptor inconsistent: 26 vs 25 free clusters