syzbot

======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.496/6641 is trying to acquire lock:
ffff888054e85f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
ffff888054e85f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: ocfs2_lock_global_qf+0x1c7/0x270 fs/ocfs2/quota_global.c:313

but task is already holding lock:
ffff88806f8fa0a8 (&dquot->dq_lock){+.+.}-{3:3}, at: ocfs2_acquire_dquot+0x293/0xb10 fs/ocfs2/quota_global.c:811

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #6 (
&dquot->dq_lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747
       dquot_commit+0x5a/0x410 fs/quota/dquot.c:507
       ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6785
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412
       __dquot_free_space+0x7ec/0xbc0 fs/quota/dquot.c:1942
       dquot_free_space_nodirty include/linux/quotaops.h:379 [inline]
       dquot_free_space include/linux/quotaops.h:384 [inline]
       dquot_free_block include/linux/quotaops.h:395 [inline]
       ext4_mb_clear_bb fs/ext4/mballoc.c:6138 [inline]
       ext4_free_blocks+0x1bab/0x2640 fs/ext4/mballoc.c:6268
       ext4_remove_blocks fs/ext4/extents.c:2526 [inline]
       ext4_ext_rm_leaf fs/ext4/extents.c:2692 [inline]
       ext4_ext_remove_space+0x1f0d/0x4490 fs/ext4/extents.c:2940
       ext4_ext_truncate+0x211/0x370 fs/ext4/extents.c:4470
       ext4_truncate+0xa0b/0x1230 fs/ext4/inode.c:4295
       ext4_setattr+0x10cb/0x19f0 fs/ext4/inode.c:5645
       notify_change+0xc74/0xf40 fs/attr.c:499
       do_truncate+0x197/0x220 fs/open.c:65
       handle_truncate fs/namei.c:3293 [inline]
       do_open fs/namei.c:3638 [inline]
       path_openat+0x27f2/0x2e70 fs/namei.c:3791
       do_filp_open+0x1c1/0x3c0 fs/namei.c:3818
       do_sys_openat2+0x142/0x490 fs/open.c:1320
       do_sys_open fs/open.c:1336 [inline]
       __do_sys_openat fs/open.c:1352 [inline]
       __se_sys_openat fs/open.c:1347 [inline]
       __x64_sys_openat+0x135/0x160 fs/open.c:1347
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #5 (&ei->i_data_sem){++++}-{3:3}:
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       ext4_truncate+0x987/0x1230 fs/ext4/inode.c:4290
       ext4_setattr+0x10cb/0x19f0 fs/ext4/inode.c:5645
       notify_change+0xc74/0xf40 fs/attr.c:499
       do_truncate+0x197/0x220 fs/open.c:65
       do_sys_ftruncate+0x312/0x3c0 fs/open.c:193
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #4 (jbd2_handle){++++}-{0:0}:
       start_this_handle+0x1f49/0x2150 fs/jbd2/transaction.c:463
       jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:520
       jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:559
       ocfs2_start_trans+0x372/0x6c0 fs/ocfs2/journal.c:376
       ocfs2_shutdown_local_alloc+0x1fd/0xa10 fs/ocfs2/localalloc.c:416
       ocfs2_dismount_volume+0x1fc/0x930 fs/ocfs2/super.c:1882
       generic_shutdown_super+0x130/0x340 fs/super.c:501
       kill_block_super+0x7c/0xe0 fs/super.c:1470
       deactivate_locked_super+0x93/0xf0 fs/super.c:332
       cleanup_mnt+0x463/0x4f0 fs/namespace.c:1191
       task_work_run+0x1ca/0x250 kernel/task_work.c:203
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
       exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
       __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
       syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
       do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #3 (&journal->j_trans_barrier){.+.+}-{3:3}:
       down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520
       ocfs2_start_trans+0x366/0x6c0 fs/ocfs2/journal.c:374
       ocfs2_shutdown_local_alloc+0x1fd/0xa10 fs/ocfs2/localalloc.c:416
       ocfs2_dismount_volume+0x1fc/0x930 fs/ocfs2/super.c:1882
       generic_shutdown_super+0x130/0x340 fs/super.c:501
       kill_block_super+0x7c/0xe0 fs/super.c:1470
       deactivate_locked_super+0x93/0xf0 fs/super.c:332
       cleanup_mnt+0x463/0x4f0 fs/namespace.c:1191
       task_work_run+0x1ca/0x250 kernel/task_work.c:203
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
       exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
       __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
       syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
       do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #2 (sb_internal#4){.+.+}-{0:0}:
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write include/linux/fs.h:1891 [inline]
       sb_start_intwrite include/linux/fs.h:2013 [inline]
       ocfs2_start_trans+0x267/0x6c0 fs/ocfs2/journal.c:372
       ocfs2_write_info+0x117/0x350 fs/ocfs2/quota_global.c:982
       dquot_set_dqinfo+0x459/0x6c0 fs/quota/dquot.c:2911
       quota_setinfo+0x2a4/0x2b0 fs/quota/quota.c:174
       __do_sys_quotactl fs/quota/quota.c:960 [inline]
       __se_sys_quotactl+0x295/0x6b0 fs/quota/quota.c:916
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       ocfs2_lock_global_qf+0x1e5/0x270 fs/ocfs2/quota_global.c:314
       ocfs2_write_info+0xd0/0x350 fs/ocfs2/quota_global.c:979
       dquot_set_dqinfo+0x459/0x6c0 fs/quota/dquot.c:2911
       quota_setinfo+0x2a4/0x2b0 fs/quota/quota.c:174
       __do_sys_quotactl fs/quota/quota.c:960 [inline]
       __se_sys_quotactl+0x295/0x6b0 fs/quota/quota.c:916
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{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:3825 [inline]
       __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049
       lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:758 [inline]
       ocfs2_lock_global_qf+0x1c7/0x270 fs/ocfs2/quota_global.c:313
       ocfs2_acquire_dquot+0x2a0/0xb10 fs/ocfs2/quota_global.c:816
       dqget+0x778/0xeb0 fs/quota/dquot.c:988
       __dquot_initialize+0x3b6/0xcb0 fs/quota/dquot.c:1517
       ocfs2_get_init_inode+0x138/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0x8be/0x2350 fs/ocfs2/namei.c:310
       ocfs2_mkdir+0x1b6/0x4a0 fs/ocfs2/namei.c:657
       vfs_mkdir+0x387/0x570 fs/namei.c:4114
       do_mkdirat+0x1d0/0x430 fs/namei.c:4139
       __do_sys_mkdir fs/namei.c:4159 [inline]
       __se_sys_mkdir fs/namei.c:4157 [inline]
       __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4157
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
  &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7 --> &ei->i_data_sem --> &dquot->dq_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&dquot->dq_lock);
                               lock(&ei->i_data_sem);
                               lock(&dquot->dq_lock);
  lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7);

 *** DEADLOCK ***

4 locks held by syz.1.496/6641:
 #0: ffff88805d37a460 (sb_writers#27){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402
 #1: ffff888054e81808 (&type->i_mutex_dir_key#20/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
 #1: ffff888054e81808 (&type->i_mutex_dir_key#20/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3884
 #2: ffff8880420009c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #2: ffff8880420009c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x162/0x4630 fs/ocfs2/suballoc.c:782
 #3: ffff88806f8fa0a8 (&dquot->dq_lock){+.+.}-{3:3}, at: ocfs2_acquire_dquot+0x293/0xb10 fs/ocfs2/quota_global.c:811

stack backtrace:
CPU: 0 PID: 6641 Comm: syz.1.496 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 check_noncircular+0x274/0x310 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:3825 [inline]
 __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 down_write+0x36/0x60 kernel/locking/rwsem.c:1573
 inode_lock include/linux/fs.h:758 [inline]
 ocfs2_lock_global_qf+0x1c7/0x270 fs/ocfs2/quota_global.c:313
 ocfs2_acquire_dquot+0x2a0/0xb10 fs/ocfs2/quota_global.c:816
 dqget+0x778/0xeb0 fs/quota/dquot.c:988
 __dquot_initialize+0x3b6/0xcb0 fs/quota/dquot.c:1517
 ocfs2_get_init_inode+0x138/0x1b0 fs/ocfs2/namei.c:202
 ocfs2_mknod+0x8be/0x2350 fs/ocfs2/namei.c:310
 ocfs2_mkdir+0x1b6/0x4a0 fs/ocfs2/namei.c:657
 vfs_mkdir+0x387/0x570 fs/namei.c:4114
 do_mkdirat+0x1d0/0x430 fs/namei.c:4139
 __do_sys_mkdir fs/namei.c:4159 [inline]
 __se_sys_mkdir fs/namei.c:4157 [inline]
 __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4157
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f41f9b8f749
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f41fa9b7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f41f9de5fa0 RCX: 00007f41f9b8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000200
RBP: 00007f41f9c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f41f9de6038 R14: 00007f41f9de5fa0 R15: 00007ffc85ff18d8
 </TASK>
(syz.1.496,6641,1):ocfs2_block_check_validate:402 ERROR: CRC32 failed: stored: 0x1cec3d0f, computed 0xd2ffbdfe. Applying ECC.
(syz.1.496,6641,1):ocfs2_block_check_validate:402 ERROR: CRC32 failed: stored: 0xdf8356d3, computed 0xb8c23ae4. Applying ECC.
(syz.1.496,6641,1):ocfs2_block_check_validate:416 ERROR: Fixed CRC32 failed: stored: 0xdf8356d3, computed 0x2acb7e3c
(syz.1.496,6641,1):ocfs2_read_quota_phys_block:160 ERROR: status = -5
(syz.1.496,6641,1):ocfs2_quota_read:201 ERROR: status = -5
Quota error (device loop1): find_block_dqentry: Can't read quota tree block 6
Quota error (device loop1): qtree_read_dquot: Can't read quota structure for id 0
(syz.1.496,6641,1):ocfs2_acquire_dquot:878 ERROR: status = -5
(syz.1.496,6641,1):ocfs2_mknod:314 ERROR: status = -5
(syz.1.496,6641,1):ocfs2_mknod:502 ERROR: status = -5
(syz.1.496,6641,1):ocfs2_mkdir:659 ERROR: status = -5