syzbot

JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.289/7892 is trying to acquire lock:
ffff888033c38770 (sb_internal#6){.+.+}-{0:0}, at: ocfs2_acquire_dquot+0x445/0xb10 fs/ocfs2/quota_global.c:860

but task is already holding lock:
ffff88805c7e6c50 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_lock_global_qf+0x1e8/0x270 fs/ocfs2/quota_global.c:314

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #6 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}:
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
       ocfs2_lock_global_qf+0x1e8/0x270 fs/ocfs2/quota_global.c:314
       ocfs2_acquire_dquot+0x2a0/0xb10 fs/ocfs2/quota_global.c:828
       dqget+0x7b6/0xf10 fs/quota/dquot.c:980
       dquot_set_dqblk+0x2b/0xfa0 fs/quota/dquot.c:2823
       quota_setquota+0x4b7/0x540 fs/quota/quota.c:310
       __do_sys_quotactl fs/quota/quota.c:961 [inline]
       __se_sys_quotactl+0x279/0x950 fs/quota/quota.c:917
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #5 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}:
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
       inode_lock include/linux/fs.h:1027 [inline]
       ocfs2_lock_global_qf+0x1ca/0x270 fs/ocfs2/quota_global.c:313
       ocfs2_acquire_dquot+0x2a0/0xb10 fs/ocfs2/quota_global.c:828
       dqget+0x7b6/0xf10 fs/quota/dquot.c:980
       dquot_set_dqblk+0x2b/0xfa0 fs/quota/dquot.c:2823
       quota_setquota+0x4b7/0x540 fs/quota/quota.c:310
       __do_sys_quotactl fs/quota/quota.c:961 [inline]
       __se_sys_quotactl+0x279/0x950 fs/quota/quota.c:917
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #4 (&dquot->dq_lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/rtmutex_api.c:533 [inline]
       mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:552
       wait_on_dquot fs/quota/dquot.c:357 [inline]
       dqget+0x72f/0xf10 fs/quota/dquot.c:975
       dquot_transfer+0x2f8/0x6d0 fs/quota/dquot.c:2143
       ext4_setattr+0x865/0x1bc0 fs/ext4/inode.c:5877
       notify_change+0xc18/0xf60 fs/attr.c:546
       chown_common+0x40c/0x5c0 fs/open.c:788
       vfs_fchown fs/open.c:856 [inline]
       ksys_fchown+0xea/0x160 fs/open.c:868
       __do_sys_fchown fs/open.c:873 [inline]
       __se_sys_fchown fs/open.c:871 [inline]
       __x64_sys_fchown+0x7a/0x90 fs/open.c:871
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (&ei->xattr_sem){++++}-{4:4}:
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
       ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
       ext4_xattr_set_handle+0x165/0x1590 fs/ext4/xattr.c:2367
       ext4_initxattrs+0x9f/0x110 fs/ext4/xattr_security.c:44
       security_inode_init_security+0x290/0x3d0 security/security.c:1344
       __ext4_new_inode+0x32f7/0x3c90 fs/ext4/ialloc.c:1325
       ext4_create+0x22d/0x460 fs/ext4/namei.c:2822
       lookup_open fs/namei.c:4440 [inline]
       open_last_lookups fs/namei.c:4540 [inline]
       path_openat+0x18d1/0x3df0 fs/namei.c:4784
       do_filp_open+0x1fa/0x410 fs/namei.c:4814
       do_sys_openat2+0x121/0x200 fs/open.c:1430
       do_sys_open fs/open.c:1436 [inline]
       __do_sys_openat fs/open.c:1452 [inline]
       __se_sys_openat fs/open.c:1447 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1447
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (jbd2_handle){++++}-{0:0}:
       start_this_handle+0x1fa7/0x21c0 fs/jbd2/transaction.c:444
       jbd2__journal_start+0x2c1/0x5b0 fs/jbd2/transaction.c:501
       jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:540
       ocfs2_start_trans+0x377/0x6d0 fs/ocfs2/journal.c:374
       ocfs2_shutdown_local_alloc+0x200/0xa10 fs/ocfs2/localalloc.c:417
       ocfs2_dismount_volume+0x1e9/0x8b0 fs/ocfs2/super.c:1825
       generic_shutdown_super+0x135/0x2c0 fs/super.c:643
       kill_block_super+0x44/0x90 fs/super.c:1730
       deactivate_locked_super+0xbc/0x130 fs/super.c:474
       cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318
       task_work_run+0x1d4/0x260 kernel/task_work.c:233
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
       exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
       __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
       syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
       syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
       syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
       do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x97/0x1f0 kernel/locking/rwsem.c:1537
       ocfs2_start_trans+0x36b/0x6d0 fs/ocfs2/journal.c:372
       ocfs2_shutdown_local_alloc+0x200/0xa10 fs/ocfs2/localalloc.c:417
       ocfs2_dismount_volume+0x1e9/0x8b0 fs/ocfs2/super.c:1825
       generic_shutdown_super+0x135/0x2c0 fs/super.c:643
       kill_block_super+0x44/0x90 fs/super.c:1730
       deactivate_locked_super+0xbc/0x130 fs/super.c:474
       cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318
       task_work_run+0x1d4/0x260 kernel/task_work.c:233
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
       exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
       __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
       syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
       syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
       syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
       do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (sb_internal#6){.+.+}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868
       percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
       percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
       __sb_start_write include/linux/fs/super.h:19 [inline]
       sb_start_intwrite include/linux/fs/super.h:177 [inline]
       ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:370
       ocfs2_acquire_dquot+0x445/0xb10 fs/ocfs2/quota_global.c:860
       dqget+0x7b6/0xf10 fs/quota/dquot.c:980
       dquot_set_dqblk+0x2b/0xfa0 fs/quota/dquot.c:2823
       quota_setquota+0x4b7/0x540 fs/quota/quota.c:310
       __do_sys_quotactl fs/quota/quota.c:961 [inline]
       __se_sys_quotactl+0x279/0x950 fs/quota/quota.c:917
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  sb_internal#6 --> &ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE] --> &ocfs2_quota_ip_alloc_sem_key

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ocfs2_quota_ip_alloc_sem_key);
                               lock(&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]);
                               lock(&ocfs2_quota_ip_alloc_sem_key);
  rlock(sb_internal#6);

 *** DEADLOCK ***

4 locks held by syz.0.289/7892:
 #0: ffff888033c380d0 (&type->s_umount_key#93){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
 #0: ffff888033c380d0 (&type->s_umount_key#93){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
 #1: ffff88805a52e098 (&dquot->dq_lock){+.+.}-{4:4}, at: ocfs2_acquire_dquot+0x293/0xb10 fs/ocfs2/quota_global.c:823
 #2: ffff88805c7e7000 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline]
 #2: ffff88805c7e7000 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_lock_global_qf+0x1ca/0x270 fs/ocfs2/quota_global.c:313
 #3: ffff88805c7e6c50 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_lock_global_qf+0x1e8/0x270 fs/ocfs2/quota_global.c:314

stack backtrace:
CPU: 1 UID: 0 PID: 7892 Comm: syz.0.289 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868
 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
 percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
 __sb_start_write include/linux/fs/super.h:19 [inline]
 sb_start_intwrite include/linux/fs/super.h:177 [inline]
 ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:370
 ocfs2_acquire_dquot+0x445/0xb10 fs/ocfs2/quota_global.c:860
 dqget+0x7b6/0xf10 fs/quota/dquot.c:980
 dquot_set_dqblk+0x2b/0xfa0 fs/quota/dquot.c:2823
 quota_setquota+0x4b7/0x540 fs/quota/quota.c:310
 __do_sys_quotactl fs/quota/quota.c:961 [inline]
 __se_sys_quotactl+0x279/0x950 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fecd982f749
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:00007fecd7a8e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fecd9a85fa0 RCX: 00007fecd982f749
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: ffffffff80000800
RBP: 00007fecd98b3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fecd9a86038 R14: 00007fecd9a85fa0 R15: 00007ffd6dbef8d8
 </TASK>