EXT4-fs (loop0): feature flags set on rev 0 fs, running e2fsck is recommended
EXT4-fs (loop0): 1 truncate cleaned up
======================================================
WARNING: possible circular locking dependency detected
5.15.160-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor156/4216 is trying to acquire lock:
ffff0000def1a428 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:507

but task is already holding lock:
ffff0000dedc4840 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x828/0x19ac fs/ext4/inode.c:638

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+0xc0/0x398 kernel/locking/rwsem.c:1498
       ext4_map_blocks+0x2b4/0x19ac fs/ext4/inode.c:568
       ext4_getblk+0x160/0x688 fs/ext4/inode.c:846
       ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:899
       ext4_quota_read+0x178/0x294 fs/ext4/super.c:6520
       read_blk fs/quota/quota_tree.c:55 [inline]
       find_tree_dqentry+0x15c/0x930 fs/quota/quota_tree.c:617
       find_tree_dqentry+0x300/0x930 fs/quota/quota_tree.c:635
       find_dqentry fs/quota/quota_tree.c:647 [inline]
       qtree_read_dquot+0x128/0x5fc fs/quota/quota_tree.c:667
       v2_read_dquot+0xc0/0x11c fs/quota/quota_v2.c:333
       dquot_acquire+0x130/0x5e4 fs/quota/dquot.c:463
       ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6192
       dqget+0x664/0xcd4 fs/quota/dquot.c:986
       __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1516
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1578
       ext4_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329
       ext4_orphan_cleanup+0x8bc/0x1048 fs/ext4/orphan.c:474
       ext4_fill_super+0x8044/0x8768 fs/ext4/super.c:4974
       mount_bdev+0x274/0x370 fs/super.c:1387
       ext4_mount+0x44/0x58 fs/ext4/super.c:6602
       legacy_get_tree+0xd4/0x16c fs/fs_context.c:611
       vfs_get_tree+0x90/0x274 fs/super.c:1517
       do_new_mount+0x278/0x8fc fs/namespace.c:3005
       path_mount+0x594/0x101c fs/namespace.c:3335
       do_mount fs/namespace.c:3348 [inline]
       __do_sys_mount fs/namespace.c:3556 [inline]
       __se_sys_mount fs/namespace.c:3533 [inline]
       __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3533
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
       el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
       el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       down_read+0xc0/0x398 kernel/locking/rwsem.c:1498
       v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:332
       dquot_acquire+0x130/0x5e4 fs/quota/dquot.c:463
       ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6192
       dqget+0x664/0xcd4 fs/quota/dquot.c:986
       __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1516
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1578
       ext4_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329
       ext4_orphan_cleanup+0x8bc/0x1048 fs/ext4/orphan.c:474
       ext4_fill_super+0x8044/0x8768 fs/ext4/super.c:4974
       mount_bdev+0x274/0x370 fs/super.c:1387
       ext4_mount+0x44/0x58 fs/ext4/super.c:6602
       legacy_get_tree+0xd4/0x16c fs/fs_context.c:611
       vfs_get_tree+0x90/0x274 fs/super.c:1517
       do_new_mount+0x278/0x8fc fs/namespace.c:3005
       path_mount+0x594/0x101c fs/namespace.c:3335
       do_mount fs/namespace.c:3348 [inline]
       __do_sys_mount fs/namespace.c:3556 [inline]
       __se_sys_mount fs/namespace.c:3533 [inline]
       __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3533
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
       el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
       el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3053 [inline]
       check_prevs_add kernel/locking/lockdep.c:3172 [inline]
       validate_chain kernel/locking/lockdep.c:3788 [inline]
       __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012
       lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623
       __mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596
       __mutex_lock kernel/locking/mutex.c:729 [inline]
       mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
       dquot_commit+0x54/0x240 fs/quota/dquot.c:507
       ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6172
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6232
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412
       __dquot_alloc_space+0xb54/0xf7c fs/quota/dquot.c:1751
       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+0xf34/0x4318 fs/ext4/mballoc.c:5678
       ext4_ext_map_blocks+0x1500/0x64c4 fs/ext4/extents.c:4316
       ext4_map_blocks+0x8c4/0x19ac fs/ext4/inode.c:645
       _ext4_get_block+0x1c0/0x5c0 fs/ext4/inode.c:792
       ext4_get_block+0x4c/0x60 fs/ext4/inode.c:809
       ext4_block_write_begin+0x520/0x1130 fs/ext4/inode.c:1077
       ext4_write_begin+0x5e4/0xe84
       generic_perform_write+0x24c/0x520 mm/filemap.c:3785
       ext4_buffered_write_iter+0x3fc/0x528 fs/ext4/file.c:268
       ext4_file_write_iter+0x688/0x162c
       call_write_iter include/linux/fs.h:2172 [inline]
       new_sync_write fs/read_write.c:507 [inline]
       vfs_write+0x87c/0xb3c fs/read_write.c:594
       ksys_write+0x15c/0x26c fs/read_write.c:647
       __do_sys_write fs/read_write.c:659 [inline]
       __se_sys_write fs/read_write.c:656 [inline]
       __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
       el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
       el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

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-executor156/4216:
 #0: ffff0000dce1c460 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x228/0xb3c fs/read_write.c:590
 #1: ffff0000dedc49b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline]
 #1: ffff0000dedc49b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0x9c/0x528 fs/ext4/file.c:262
 #2: ffff0000dedc4840 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x828/0x19ac fs/ext4/inode.c:638
 #3: ffff800014c389f8 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:311

stack backtrace:
CPU: 0 PID: 4216 Comm: syz-executor156 Not tainted 5.15.160-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __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:2011
 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2133
 check_prev_add kernel/locking/lockdep.c:3053 [inline]
 check_prevs_add kernel/locking/lockdep.c:3172 [inline]
 validate_chain kernel/locking/lockdep.c:3788 [inline]
 __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012
 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623
 __mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
 dquot_commit+0x54/0x240 fs/quota/dquot.c:507
 ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6172
 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6232
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412
 __dquot_alloc_space+0xb54/0xf7c fs/quota/dquot.c:1751
 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+0xf34/0x4318 fs/ext4/mballoc.c:5678
 ext4_ext_map_blocks+0x1500/0x64c4 fs/ext4/extents.c:4316
 ext4_map_blocks+0x8c4/0x19ac fs/ext4/inode.c:645
 _ext4_get_block+0x1c0/0x5c0 fs/ext4/inode.c:792
 ext4_get_block+0x4c/0x60 fs/ext4/inode.c:809
 ext4_block_write_begin+0x520/0x1130 fs/ext4/inode.c:1077
 ext4_write_begin+0x5e4/0xe84
 generic_perform_write+0x24c/0x520 mm/filemap.c:3785
 ext4_buffered_write_iter+0x3fc/0x528 fs/ext4/file.c:268
 ext4_file_write_iter+0x688/0x162c
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x87c/0xb3c fs/read_write.c:594
 ksys_write+0x15c/0x26c fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584