option from the mount to silence this warning. ======================================================= ocfs2: Mounting device (7,0) on (node local, slot 0) with writeback data mode. overlayfs: upper fs does not support tmpfile. overlayfs: upper fs does not support RENAME_WHITEOUT. ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc2-syzkaller-00318-g739a6c93cc75 #0 Not tainted ------------------------------------------------------ syz-executor236/5824 is trying to acquire lock: ffff8880777f2640 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] ffff8880777f2640 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: ocfs2_reserve_local_alloc_bits+0x125/0x24e0 fs/ocfs2/localalloc.c:636 but task is already holding lock: ffff8880777f5c78 (&oi->ip_xattr_sem){+.+.}-{4:4}, at: ocfs2_xattr_set+0x40f/0x11f0 fs/ocfs2/xattr.c:3583 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&oi->ip_xattr_sem){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_xattr_set_handle+0x3b0/0x7a0 fs/ocfs2/xattr.c:3501 ocfs2_init_security_set+0xbd/0xe0 fs/ocfs2/xattr.c:7307 ocfs2_mknod+0x137f/0x2050 fs/ocfs2/namei.c:419 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:656 vfs_mkdir+0x303/0x510 fs/namei.c:4375 do_mkdirat+0x247/0x590 fs/namei.c:4408 __do_sys_mkdir fs/namei.c:4430 [inline] __se_sys_mkdir fs/namei.c:4428 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4428 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (jbd2_handle){.+.+}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 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+0x376/0x6d0 fs/ocfs2/journal.c:374 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:685 [inline] ocfs2_reserve_suballoc_bits+0x711/0x4640 fs/ocfs2/suballoc.c:834 ocfs2_reserve_new_inode+0x4f4/0xcc0 fs/ocfs2/suballoc.c:1074 ocfs2_mknod+0x83c/0x2050 fs/ocfs2/namei.c:303 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:656 vfs_mkdir+0x303/0x510 fs/namei.c:4375 do_mkdirat+0x247/0x590 fs/namei.c:4408 __do_sys_mkdir fs/namei.c:4430 [inline] __se_sys_mkdir fs/namei.c:4428 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4428 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&journal->j_trans_barrier){.+.+}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 ocfs2_start_trans+0x36a/0x6d0 fs/ocfs2/journal.c:372 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:685 [inline] ocfs2_reserve_suballoc_bits+0x711/0x4640 fs/ocfs2/suballoc.c:834 ocfs2_reserve_new_inode+0x4f4/0xcc0 fs/ocfs2/suballoc.c:1074 ocfs2_mknod+0x83c/0x2050 fs/ocfs2/namei.c:303 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:656 vfs_mkdir+0x303/0x510 fs/namei.c:4375 do_mkdirat+0x247/0x590 fs/namei.c:4408 __do_sys_mkdir fs/namei.c:4430 [inline] __se_sys_mkdir fs/namei.c:4428 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4428 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (sb_internal#2){.+.+}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 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:1795 [inline] sb_start_intwrite include/linux/fs.h:1978 [inline] ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:370 ocfs2_mknod+0xe93/0x2050 fs/ocfs2/namei.c:361 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:656 vfs_mkdir+0x303/0x510 fs/namei.c:4375 do_mkdirat+0x247/0x590 fs/namei.c:4408 __do_sys_mkdir fs/namei.c:4430 [inline] __se_sys_mkdir fs/namei.c:4428 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4428 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:869 [inline] ocfs2_reserve_local_alloc_bits+0x125/0x24e0 fs/ocfs2/localalloc.c:636 ocfs2_reserve_clusters_with_limit+0x1be/0xba0 fs/ocfs2/suballoc.c:1168 ocfs2_init_xattr_set_ctxt+0x376/0x700 fs/ocfs2/xattr.c:3286 ocfs2_xattr_set+0xb70/0x11f0 fs/ocfs2/xattr.c:3634 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321 ovl_do_setxattr fs/overlayfs/overlayfs.h:317 [inline] ovl_setxattr fs/overlayfs/overlayfs.h:329 [inline] ovl_make_workdir fs/overlayfs/super.c:715 [inline] ovl_get_workdir+0xbb7/0x1730 fs/overlayfs/super.c:827 ovl_fill_super+0x1386/0x35d0 fs/overlayfs/super.c:1406 vfs_get_super fs/super.c:1325 [inline] get_tree_nodev+0xb8/0x150 fs/super.c:1344 vfs_get_tree+0x92/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3885 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4410 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 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: &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5 --> jbd2_handle --> &oi->ip_xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->ip_xattr_sem); lock(jbd2_handle); lock(&oi->ip_xattr_sem); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5); *** DEADLOCK *** 4 locks held by syz-executor236/5824: #0: ffff888034f0a0e0 (&type->s_umount_key#43/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970 fs/super.c:345 #1: ffff888029ad4428 (sb_writers#8){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #2: ffff8880777f5f40 (&sb->s_type->i_mutex_key#16){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #2: ffff8880777f5f40 (&sb->s_type->i_mutex_key#16){++++}-{4:4}, at: vfs_setxattr+0x144/0x2f0 fs/xattr.c:320 #3: ffff8880777f5c78 (&oi->ip_xattr_sem){+.+.}-{4:4}, at: ocfs2_xattr_set+0x40f/0x11f0 fs/ocfs2/xattr.c:3583 stack backtrace: CPU: 1 UID: 0 PID: 5824 Comm: syz-executor236 Not tainted 6.16.0-rc2-syzkaller-00318-g739a6c93cc75 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:869 [inline] ocfs2_reserve_local_alloc_bits+0x125/0x24e0 fs/ocfs2/localalloc.c:636 ocfs2_reserve_clusters_with_limit+0x1be/0xba0 fs/ocfs2/suballoc.c:1168 ocfs2_init_xattr_set_ctxt+0x376/0x700 fs/ocfs2/xattr.c:3286 ocfs2_xattr_set+0xb70/0x11f0 fs/ocfs2/xattr.c:3634 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321 ovl_do_setxattr fs/overlayfs/overlayfs.h:317 [inline] ovl_setxattr fs/overlayfs/overlayfs.h:329 [inline] ovl_make_workdir fs/overlayfs/super.c:715 [inline] ovl_get_workdir+0xbb7/0x1730 fs/overlayfs/super.c:827 ovl_fill_super+0x1386/0x35d0 fs/overlayfs/super.c:1406 vfs_get_super fs/super.c:1325 [inline] get_tree_nodev+0xb8/0x150 fs/super.c:1344 vfs_get_tree+0x92/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3885 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4410 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0a26b89839 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcc7267b58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00002000000004