ocfs2: Mounting device (7,4) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.6318/20892 is trying to acquire lock: ffff88803209e618 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_acquire_dquot+0x563/0xb00 fs/ocfs2/quota_global.c:860 but task is already holding lock: ffff88804cbe8660 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_lock_global_qf+0x1c1/0x2d0 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+0x92/0x200 kernel/locking/rwsem.c:1590 ocfs2_lock_global_qf+0x1c1/0x2d0 fs/ocfs2/quota_global.c:314 ocfs2_acquire_dquot+0x258/0xb00 fs/ocfs2/quota_global.c:828 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 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+0x92/0x200 kernel/locking/rwsem.c:1590 inode_lock include/linux/fs.h:870 [inline] ocfs2_lock_global_qf+0x194/0x2d0 fs/ocfs2/quota_global.c:313 ocfs2_acquire_dquot+0x258/0xb00 fs/ocfs2/quota_global.c:828 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 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/mutex.c:598 [inline] __mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x5f1/0x1180 fs/quota/dquot.c:972 dquot_transfer+0x3a8/0x6a0 fs/quota/dquot.c:2140 ext4_setattr+0x885/0x2ae0 fs/ext4/inode.c:5902 notify_change+0x6a9/0x1230 fs/attr.c:552 chown_common+0x54e/0x680 fs/open.c:791 do_fchownat+0x1a7/0x200 fs/open.c:822 __do_sys_fchownat fs/open.c:837 [inline] __se_sys_fchownat fs/open.c:834 [inline] __x64_sys_fchownat+0xbd/0x160 fs/open.c:834 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&ei->xattr_sem){++++}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1537 ext4_setattr+0x875/0x2ae0 fs/ext4/inode.c:5901 notify_change+0x6a9/0x1230 fs/attr.c:552 chown_common+0x54e/0x680 fs/open.c:791 do_fchownat+0x1a7/0x200 fs/open.c:822 __do_sys_chown fs/open.c:842 [inline] __se_sys_chown fs/open.c:840 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:840 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0x5ea/0x1410 fs/jbd2/transaction.c:444 jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:501 jbd2_journal_start+0x29/0x40 fs/jbd2/transaction.c:540 ocfs2_start_trans+0x3b9/0x970 fs/ocfs2/journal.c:374 ocfs2_modify_bh+0xbd/0x490 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0xdad/0x16b0 fs/ocfs2/quota_local.c:767 dquot_load_quota_sb+0x83d/0x1050 fs/quota/dquot.c:2459 dquot_load_quota_inode fs/quota/dquot.c:2496 [inline] dquot_load_quota_inode+0x2a3/0x470 fs/quota/dquot.c:2488 ocfs2_enable_quotas+0x28a/0x5a0 fs/ocfs2/super.c:930 ocfs2_fill_super+0x1d7c/0x43b0 fs/ocfs2/super.c:1140 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692 vfs_get_tree+0x8e/0x340 fs/super.c:1815 do_new_mount fs/namespace.c:3808 [inline] path_mount+0x1513/0x2000 fs/namespace.c:4123 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount fs/namespace.c:4324 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1537 ocfs2_start_trans+0x3ae/0x970 fs/ocfs2/journal.c:372 ocfs2_modify_bh+0xbd/0x490 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0xdad/0x16b0 fs/ocfs2/quota_local.c:767 dquot_load_quota_sb+0x83d/0x1050 fs/quota/dquot.c:2459 dquot_load_quota_inode fs/quota/dquot.c:2496 [inline] dquot_load_quota_inode+0x2a3/0x470 fs/quota/dquot.c:2488 ocfs2_enable_quotas+0x28a/0x5a0 fs/ocfs2/super.c:930 ocfs2_fill_super+0x1d7c/0x43b0 fs/ocfs2/super.c:1140 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692 vfs_get_tree+0x8e/0x340 fs/super.c:1815 do_new_mount fs/namespace.c:3808 [inline] path_mount+0x1513/0x2000 fs/namespace.c:4123 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount fs/namespace.c:4324 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (sb_internal#2){.+.+}-{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+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 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.h:1799 [inline] sb_start_intwrite include/linux/fs.h:1982 [inline] ocfs2_start_trans+0x29d/0x970 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x563/0xb00 fs/ocfs2/quota_global.c:860 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 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#2 --> &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#2); *** DEADLOCK *** 4 locks held by syz.4.6318/20892: #0: ffff88803209e0e0 (&type->s_umount_key#105){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline] #0: ffff88803209e0e0 (&type->s_umount_key#105){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121 #1: ffff88808c8d60a8 (&dquot->dq_lock){+.+.}-{4:4}, at: ocfs2_acquire_dquot+0x24b/0xb00 fs/ocfs2/quota_global.c:823 #2: ffff88804cbe89c0 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline] #2: ffff88804cbe89c0 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_lock_global_qf+0x194/0x2d0 fs/ocfs2/quota_global.c:313 #3: ffff88804cbe8660 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_lock_global_qf+0x1c1/0x2d0 fs/ocfs2/quota_global.c:314 stack backtrace: CPU: 0 UID: 0 PID: 20892 Comm: syz.4.6318 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043 check_noncircular+0x14c/0x170 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+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 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.h:1799 [inline] sb_start_intwrite include/linux/fs.h:1982 [inline] ocfs2_start_trans+0x29d/0x970 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x563/0xb00 fs/ocfs2/quota_global.c:860 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa36278eba9 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:00007fa363636038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007fa3629d5fa0 RCX: 00007fa36278eba9 RDX: 0000000000000000 RSI: 00002000000001c0 RDI: ffffffff80000800 RBP: 00007fa362811e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000040 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa3629d6038 R14: 00007fa3629d5fa0 R15: 00007ffdf5f2cbb8