====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc5-syzkaller-00158-g3013c33dcbd9 #0 Not tainted ------------------------------------------------------ syz.7.16670/3356 is trying to acquire lock: ffff888056ccdca8 (&dquot->dq_lock){+.+.}-{4:4}, at: wait_on_dquot fs/quota/dquot.c:354 [inline] ffff888056ccdca8 (&dquot->dq_lock){+.+.}-{4:4}, at: dqget+0x5f1/0x1180 fs/quota/dquot.c:972 but task is already holding lock: ffff88807850e3d8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_setattr+0x875/0x2b70 fs/ext4/inode.c:5459 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&ei->xattr_sem){++++}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 ext4_setattr+0x875/0x2b70 fs/ext4/inode.c:5459 notify_change+0x6a9/0x1230 fs/attr.c:552 chown_common+0x536/0x670 fs/open.c:782 do_fchownat+0x1a7/0x200 fs/open.c:813 __do_sys_chown fs/open.c:833 [inline] __se_sys_chown fs/open.c:831 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:831 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (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:352 ocfs2_shutdown_local_alloc+0x281/0xa10 fs/ocfs2/localalloc.c:417 ocfs2_dismount_volume+0x1ed/0x9f0 fs/ocfs2/super.c:1822 generic_shutdown_super+0x156/0x390 fs/super.c:642 kill_block_super+0x3b/0x90 fs/super.c:1710 deactivate_locked_super+0xc1/0x1a0 fs/super.c:473 deactivate_super fs/super.c:506 [inline] deactivate_super+0xde/0x100 fs/super.c:502 cleanup_mnt+0x225/0x450 fs/namespace.c:1435 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 ocfs2_start_trans+0x3ae/0x970 fs/ocfs2/journal.c:350 ocfs2_shutdown_local_alloc+0x281/0xa10 fs/ocfs2/localalloc.c:417 ocfs2_dismount_volume+0x1ed/0x9f0 fs/ocfs2/super.c:1822 generic_shutdown_super+0x156/0x390 fs/super.c:642 kill_block_super+0x3b/0x90 fs/super.c:1710 deactivate_locked_super+0xc1/0x1a0 fs/super.c:473 deactivate_super fs/super.c:506 [inline] deactivate_super+0xde/0x100 fs/super.c:502 cleanup_mnt+0x225/0x450 fs/namespace.c:1435 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (sb_internal#3){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_intwrite include/linux/fs.h:1966 [inline] ocfs2_start_trans+0x29d/0x970 fs/ocfs2/journal.c:348 ocfs2_acquire_dquot+0x563/0xb00 fs/ocfs2/quota_global.c:860 dqget+0x693/0x1180 fs/quota/dquot.c:977 __dquot_initialize+0x586/0xd50 fs/quota/dquot.c:1505 ocfs2_get_init_inode+0xe7/0x1b0 fs/ocfs2/namei.c:202 ocfs2_symlink+0xbb0/0x3a10 fs/ocfs2/namei.c:1887 vfs_symlink fs/namei.c:4723 [inline] vfs_symlink+0x403/0x680 fs/namei.c:4707 do_symlinkat+0x261/0x310 fs/namei.c:4749 __do_sys_symlink fs/namei.c:4770 [inline] __se_sys_symlink fs/namei.c:4768 [inline] __x64_sys_symlink+0x75/0x90 fs/namei.c:4768 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: down_write+0x92/0x200 kernel/locking/rwsem.c:1577 ocfs2_create_local_dquot+0x157/0xb30 fs/ocfs2/quota_local.c:1232 ocfs2_acquire_dquot+0x626/0xb00 fs/ocfs2/quota_global.c:883 dqget+0x693/0x1180 fs/quota/dquot.c:977 __dquot_initialize+0x586/0xd50 fs/quota/dquot.c:1505 ocfs2_get_init_inode+0xe7/0x1b0 fs/ocfs2/namei.c:202 ocfs2_symlink+0xbb0/0x3a10 fs/ocfs2/namei.c:1887 vfs_symlink fs/namei.c:4723 [inline] vfs_symlink+0x403/0x680 fs/namei.c:4707 do_symlinkat+0x261/0x310 fs/namei.c:4749 __do_sys_symlink fs/namei.c:4770 [inline] __se_sys_symlink fs/namei.c:4768 [inline] __x64_sys_symlink+0x75/0x90 fs/namei.c:4768 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&dquot->dq_lock){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x5f1/0x1180 fs/quota/dquot.c:972 dquot_transfer+0x52f/0x6a0 fs/quota/dquot.c:2154 ext4_setattr+0x885/0x2b70 fs/ext4/inode.c:5460 notify_change+0x6a9/0x1230 fs/attr.c:552 chown_common+0x536/0x670 fs/open.c:782 do_fchownat+0x1a7/0x200 fs/open.c:813 __do_sys_lchown fs/open.c:838 [inline] __se_sys_lchown fs/open.c:836 [inline] __x64_sys_lchown+0x7e/0xc0 fs/open.c:836 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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: &dquot->dq_lock --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(&dquot->dq_lock); *** DEADLOCK *** 3 locks held by syz.7.16670/3356: #0: ffff888021bd8420 (sb_writers#4){.+.+}-{0:0}, at: do_fchownat+0x117/0x200 fs/open.c:810 #1: ffff88807850e748 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff88807850e748 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: chown_common+0x335/0x670 fs/open.c:772 #2: ffff88807850e3d8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_setattr+0x875/0x2b70 fs/ext4/inode.c:5459 stack backtrace: CPU: 1 UID: 0 PID: 3356 Comm: syz.7.16670 Not tainted 6.15.0-rc5-syzkaller-00158-g3013c33dcbd9 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 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:2079 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x5f1/0x1180 fs/quota/dquot.c:972 dquot_transfer+0x52f/0x6a0 fs/quota/dquot.c:2154 ext4_setattr+0x885/0x2b70 fs/ext4/inode.c:5460 notify_change+0x6a9/0x1230 fs/attr.c:552 chown_common+0x536/0x670 fs/open.c:782 do_fchownat+0x1a7/0x200 fs/open.c:813 __do_sys_lchown fs/open.c:838 [inline] __se_sys_lchown fs/open.c:836 [inline] __x64_sys_lchown+0x7e/0xc0 fs/open.c:836 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f41c6f8e969 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:00007f41c7da8038 EFLAGS: 00000246 ORIG_RAX: 000000000000005e RAX: ffffffffffffffda RBX: 00007f41c71b5fa0 RCX: 00007f41c6f8e969 RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000200000000400 RBP: 00007f41c7010ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f41c71b5fa0 R15: 00007ffcc0171838