======================================================
WARNING: possible circular locking dependency detected
6.1.63-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/20648 is trying to acquire lock:
ffff00012e6666d8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x2ac/0x1850 fs/ext4/inode.c:574

but task is already holding lock:
ffff0000cb168208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x84/0x188 fs/quota/quota_v2.c:356

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       down_read+0x64/0x308 kernel/locking/rwsem.c:1520
       v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:332
       dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:461
       ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6769
       dqget+0x660/0xcb4 fs/quota/dquot.c:984
       __dquot_initialize+0x344/0xb54 fs/quota/dquot.c:1562
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1620
       ext4_create+0xb4/0x480 fs/ext4/namei.c:2827
       lookup_open fs/namei.c:3414 [inline]
       open_last_lookups fs/namei.c:3482 [inline]
       path_openat+0xeac/0x2548 fs/namei.c:3712
       do_filp_open+0x1bc/0x3cc fs/namei.c:3742
       do_sys_openat2+0x128/0x3d8 fs/open.c:1318
       do_sys_open fs/open.c:1334 [inline]
       __do_sys_openat fs/open.c:1350 [inline]
       __se_sys_openat fs/open.c:1345 [inline]
       __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
       el0_svc+0x58/0x168 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 (&dquot->dq_lock){+.+.}-{3:3}:
       __mutex_lock_common+0x190/0x21a0 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+0x54/0x240 fs/quota/dquot.c:505
       ext4_write_dquot+0x1b0/0x284 fs/ext4/super.c:6753
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6801
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:410 [inline]
       __dquot_alloc_space+0x47c/0xd00 fs/quota/dquot.c:1792
       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+0xf04/0x468c fs/ext4/mballoc.c:5628
       ext4_ext_map_blocks+0x13e8/0x6040 fs/ext4/extents.c:4287
       ext4_map_blocks+0x828/0x1850 fs/ext4/inode.c:651
       _ext4_get_block+0x1c0/0x5a0 fs/ext4/inode.c:798
       ext4_get_block+0x4c/0x60 fs/ext4/inode.c:815
       ext4_block_write_begin+0x500/0x1130 fs/ext4/inode.c:1088
       ext4_write_begin+0x620/0x138c
       generic_perform_write+0x278/0x55c mm/filemap.c:3808
       ext4_buffered_write_iter+0x2e0/0x538 fs/ext4/file.c:285
       ext4_file_write_iter+0x188/0x16a8
       call_write_iter include/linux/fs.h:2205 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x610/0x914 fs/read_write.c:584
       ksys_write+0x15c/0x26c fs/read_write.c:637
       __do_sys_write fs/read_write.c:649 [inline]
       __se_sys_write fs/read_write.c:646 [inline]
       __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
       el0_svc+0x58/0x168 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
 (
&ei->i_data_sem/2){++++}-{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:3824 [inline]
       __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5048
       lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5661
       down_read+0x64/0x308 kernel/locking/rwsem.c:1520
       ext4_map_blocks+0x2ac/0x1850 fs/ext4/inode.c:574
       ext4_getblk+0x198/0x6ec fs/ext4/inode.c:854
       ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:910
       ext4_quota_write+0x230/0x54c fs/ext4/super.c:7135
       qtree_write_dquot+0x1dc/0x488 fs/quota/quota_tree.c:431
       v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358
       dquot_commit+0x14c/0x240 fs/quota/dquot.c:512
       ext4_write_dquot+0x1b0/0x284 fs/ext4/super.c:6753
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6801
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:410 [inline]
       __dquot_alloc_space+0x47c/0xd00 fs/quota/dquot.c:1792
       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+0xf04/0x468c fs/ext4/mballoc.c:5628
       ext4_ext_map_blocks+0x13e8/0x6040 fs/ext4/extents.c:4287
       ext4_map_blocks+0x828/0x1850 fs/ext4/inode.c:651
       _ext4_get_block+0x1c0/0x5a0 fs/ext4/inode.c:798
       ext4_get_block+0x4c/0x60 fs/ext4/inode.c:815
       ext4_block_write_begin+0x500/0x1130 fs/ext4/inode.c:1088
       ext4_write_begin+0x620/0x138c
       generic_perform_write+0x278/0x55c mm/filemap.c:3808
       ext4_buffered_write_iter+0x2e0/0x538 fs/ext4/file.c:285
       ext4_file_write_iter+0x188/0x16a8
       call_write_iter include/linux/fs.h:2205 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x610/0x914 fs/read_write.c:584
       ksys_write+0x15c/0x26c fs/read_write.c:637
       __do_sys_write fs/read_write.c:649 [inline]
       __se_sys_write fs/read_write.c:646 [inline]
       __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
       el0_svc+0x58/0x168 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:
  &ei->i_data_sem/2 --> &dquot->dq_lock --> &s->s_dquot.dqio_sem

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

7 locks held by syz-executor.1/20648:
 #0: ffff0000cd60c0e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x124/0x16c fs/file.c:1062
 #1: ffff0000cb168460 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x244/0x914 fs/read_write.c:580
 #2: ffff00012e664030 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #2: ffff00012e664030 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0x9c/0x538 fs/ext4/file.c:279
 #3: ffff00012e663eb8 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x794/0x1850 fs/ext4/inode.c:644
 #4: 
ffff800015b26148 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:305
 #5: ffff00012e45fe68 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:505
 #6: ffff0000cb168208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x84/0x188 fs/quota/quota_v2.c:356

stack backtrace:
CPU: 0 PID: 20648 Comm: syz-executor.1 Not tainted 6.1.63-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048
 check_noncircular+0x2cc/0x378 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:3824 [inline]
 __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5048
 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5661
 down_read+0x64/0x308 kernel/locking/rwsem.c:1520
 ext4_map_blocks+0x2ac/0x1850 fs/ext4/inode.c:574
 ext4_getblk+0x198/0x6ec fs/ext4/inode.c:854
 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:910
 ext4_quota_write+0x230/0x54c fs/ext4/super.c:7135
 qtree_write_dquot+0x1dc/0x488 fs/quota/quota_tree.c:431
 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358
 dquot_commit+0x14c/0x240 fs/quota/dquot.c:512
 ext4_write_dquot+0x1b0/0x284 fs/ext4/super.c:6753
 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6801
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty fs/quota/dquot.c:410 [inline]
 __dquot_alloc_space+0x47c/0xd00 fs/quota/dquot.c:1792
 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+0xf04/0x468c fs/ext4/mballoc.c:5628
 ext4_ext_map_blocks+0x13e8/0x6040 fs/ext4/extents.c:4287
 ext4_map_blocks+0x828/0x1850 fs/ext4/inode.c:651
 _ext4_get_block+0x1c0/0x5a0 fs/ext4/inode.c:798
 ext4_get_block+0x4c/0x60 fs/ext4/inode.c:815
 ext4_block_write_begin+0x500/0x1130 fs/ext4/inode.c:1088
 ext4_write_begin+0x620/0x138c
 generic_perform_write+0x278/0x55c mm/filemap.c:3808
 ext4_buffered_write_iter+0x2e0/0x538 fs/ext4/file.c:285
 ext4_file_write_iter+0x188/0x16a8
 call_write_iter include/linux/fs.h:2205 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x610/0x914 fs/read_write.c:584
 ksys_write+0x15c/0x26c fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 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