syzbot

======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:16/4632 is trying to acquire lock:
ffff888054b78990 (jbd2_handle){++++}-{0:0}, at: wait_transaction_locked+0x1a6/0x270 fs/jbd2/transaction.c:177

but task is already holding lock:
ffff88807b6c68e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&journal->j_trans_barrier){.+.+}-{3:3}:
       down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520
       ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374
       ocfs2_modify_bh+0xe0/0x4c0 fs/ocfs2/quota_local.c:101
       ocfs2_local_read_info+0x13c8/0x1750 fs/ocfs2/quota_local.c:764
       dquot_load_quota_sb+0x756/0xac0 fs/quota/dquot.c:2470
       dquot_load_quota_inode+0x2d8/0x5d0 fs/quota/dquot.c:2507
       ocfs2_enable_quotas+0x1c5/0x490 fs/ocfs2/super.c:926
       ocfs2_fill_super+0x43b5/0x5090 fs/ocfs2/super.c:1139
       mount_bdev+0x287/0x3c0 fs/super.c:1443
       legacy_get_tree+0xe6/0x180 fs/fs_context.c:632
       vfs_get_tree+0x88/0x270 fs/super.c:1573
       do_new_mount+0x24a/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

-> #4 (sb_internal#3){.+.+}-{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+0x2a5/0x6f0 fs/ocfs2/journal.c:372
       ocfs2_acquire_dquot+0x681/0xb20 fs/ocfs2/quota_global.c:848
       dqget+0x778/0xeb0 fs/quota/dquot.c:988
       __dquot_initialize+0x3c3/0xcd0 fs/quota/dquot.c:1517
       ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0x8c8/0x25b0 fs/ocfs2/namei.c:310
       ocfs2_create+0x1b6/0x4b0 fs/ocfs2/namei.c:674
       lookup_open fs/namei.c:3490 [inline]
       open_last_lookups fs/namei.c:3558 [inline]
       path_openat+0x1181/0x2ee0 fs/namei.c:3788
       do_filp_open+0x1f1/0x430 fs/namei.c:3818
       do_sys_openat2+0x150/0x4b0 fs/open.c:1320
       do_sys_open fs/open.c:1336 [inline]
       __do_sys_open fs/open.c:1344 [inline]
       __se_sys_open fs/open.c:1340 [inline]
       __x64_sys_open+0x11b/0x140 fs/open.c:1340
       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

-> #3 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       ocfs2_create_local_dquot+0x1a5/0x18e0 fs/ocfs2/quota_local.c:1224
       ocfs2_acquire_dquot+0x7c6/0xb20 fs/ocfs2/quota_global.c:871
       dqget+0x778/0xeb0 fs/quota/dquot.c:988
       __dquot_initialize+0x3c3/0xcd0 fs/quota/dquot.c:1517
       ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0x8c8/0x25b0 fs/ocfs2/namei.c:310
       ocfs2_create+0x1b6/0x4b0 fs/ocfs2/namei.c:674
       lookup_open fs/namei.c:3490 [inline]
       open_last_lookups fs/namei.c:3558 [inline]
       path_openat+0x1181/0x2ee0 fs/namei.c:3788
       do_filp_open+0x1f1/0x430 fs/namei.c:3818
       do_sys_openat2+0x150/0x4b0 fs/open.c:1320
       do_sys_open fs/open.c:1336 [inline]
       __do_sys_open fs/open.c:1344 [inline]
       __se_sys_open fs/open.c:1340 [inline]
       __x64_sys_open+0x11b/0x140 fs/open.c:1340
       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

-> #2 (&dquot->dq_lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747
       dquot_commit+0x5a/0x410 fs/quota/dquot.c:507
       ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6817
       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:6153 [inline]
       ext4_free_blocks+0x1bf3/0x26a0 fs/ext4/mballoc.c:6283
       ext4_remove_blocks fs/ext4/extents.c:2526 [inline]
       ext4_ext_rm_leaf fs/ext4/extents.c:2692 [inline]
       ext4_ext_remove_space+0x225f/0x44c0 fs/ext4/extents.c:2940
       ext4_ext_truncate+0x211/0x370 fs/ext4/extents.c:4476
       ext4_truncate+0xa23/0x1240 fs/ext4/inode.c:4302
       ext4_evict_inode+0xb41/0x1110 fs/ext4/inode.c:288
       evict+0x4c9/0x8d0 fs/inode.c:705
       d_delete_notify include/linux/fsnotify.h:267 [inline]
       vfs_rmdir+0x397/0x4d0 fs/namei.c:4212
       do_rmdir+0x29a/0x5c0 fs/namei.c:4260
       __do_sys_unlinkat fs/namei.c:4440 [inline]
       __se_sys_unlinkat fs/namei.c:4434 [inline]
       __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4434
       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 (&ei->i_data_sem){++++}-{3:3}:
       down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520
       ext4_map_blocks+0x323/0x1b70 fs/ext4/inode.c:606
       ext4_append+0x232/0x560 fs/ext4/namei.c:75
       ext4_init_new_dir+0x2b8/0x570 fs/ext4/namei.c:3030
       ext4_mkdir+0x4fb/0xce0 fs/ext4/namei.c:3076
       vfs_mkdir+0x387/0x570 fs/namei.c:4114
       do_mkdirat+0x1d8/0x440 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:46 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (jbd2_handle){++++}-{0:0}:
       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+0x2d07/0x7d10 kernel/locking/lockdep.c:5049
       lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
       wait_transaction_locked+0x1bf/0x270 fs/jbd2/transaction.c:177
       add_transaction_credits fs/jbd2/transaction.c:241 [inline]
       start_this_handle+0x7ec/0x2230 fs/jbd2/transaction.c:422
       jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:520
       jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:559
       ocfs2_start_trans+0x3b0/0x6f0 fs/ocfs2/journal.c:376
       ocfs2_release_dquot+0x47c/0xc70 fs/ocfs2/quota_global.c:749
       quota_release_workfn+0x35e/0x610 fs/quota/dquot.c:848
       process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
       worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
       kthread+0x29d/0x330 kernel/kthread.c:376
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

other info that might help us debug this:

Chain exists of:
  jbd2_handle --> sb_internal#3 --> &journal->j_trans_barrier

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&journal->j_trans_barrier);
                               lock(sb_internal#3);
                               lock(&journal->j_trans_barrier);
  lock(jbd2_handle);

 *** DEADLOCK ***

7 locks held by kworker/u4:16/4632:
 #0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
 #1: ffffc90004c8fd00 ((quota_release_work).work){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
 #2: ffff888067fda2a8 (&dquot->dq_lock){+.+.}-{3:3}, at: ocfs2_release_dquot+0x260/0xc70 fs/ocfs2/quota_global.c:729
 #3: ffff8880712ded88 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #3: ffff8880712ded88 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: ocfs2_lock_global_qf+0x1d7/0x290 fs/ocfs2/quota_global.c:313
 #4: ffff8880712dea20 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1fe/0x290 fs/ocfs2/quota_global.c:314
 #5: ffff888054ad0650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_release_dquot+0x47c/0xc70 fs/ocfs2/quota_global.c:749
 #6: ffff88807b6c68e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374

stack backtrace:
CPU: 0 PID: 4632 Comm: kworker/u4:16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound quota_release_workfn
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 check_noncircular+0x296/0x330 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+0x2d07/0x7d10 kernel/locking/lockdep.c:5049
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
 wait_transaction_locked+0x1bf/0x270 fs/jbd2/transaction.c:177
 add_transaction_credits fs/jbd2/transaction.c:241 [inline]
 start_this_handle+0x7ec/0x2230 fs/jbd2/transaction.c:422
 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:520
 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:559
 ocfs2_start_trans+0x3b0/0x6f0 fs/ocfs2/journal.c:376
 ocfs2_release_dquot+0x47c/0xc70 fs/ocfs2/quota_global.c:749
 quota_release_workfn+0x35e/0x610 fs/quota/dquot.c:848
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50