overlayfs: failed to create directory ./bus/work (errno: 28); mounting read-only ====================================================== WARNING: possible circular locking dependency detected 6.6.102-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.276/7557 is trying to acquire lock: ffff888057971818 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] ffff888057971818 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x165/0x4360 fs/ocfs2/suballoc.c:782 but task is already holding lock: ffff8880597906f8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_xattr_set+0x410/0x11f0 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){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ocfs2_init_acl+0x2fa/0x720 fs/ocfs2/acl.c:366 ocfs2_mknod+0x12e5/0x20f0 fs/ocfs2/namei.c:410 ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3488 [inline] open_last_lookups fs/namei.c:3556 [inline] path_openat+0x1277/0x3190 fs/namei.c:3786 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419 do_sys_open fs/open.c:1434 [inline] __do_sys_open fs/open.c:1442 [inline] __se_sys_open fs/open.c:1438 [inline] __x64_sys_open+0x11f/0x140 fs/open.c:1438 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1e9d/0x20c0 fs/jbd2/transaction.c:448 jbd2__journal_start+0x2bb/0x5b0 fs/jbd2/transaction.c:505 jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:544 ocfs2_start_trans+0x376/0x6c0 fs/ocfs2/journal.c:374 ocfs2_symlink+0x1093/0x2550 fs/ocfs2/namei.c:1918 vfs_symlink+0x138/0x2b0 fs/namei.c:4473 do_symlinkat+0x1b2/0x3f0 fs/namei.c:4499 __do_sys_symlinkat fs/namei.c:4515 [inline] __se_sys_symlinkat fs/namei.c:4512 [inline] __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4512 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x36a/0x6c0 fs/ocfs2/journal.c:372 ocfs2_symlink+0x1093/0x2550 fs/ocfs2/namei.c:1918 vfs_symlink+0x138/0x2b0 fs/namei.c:4473 do_symlinkat+0x1b2/0x3f0 fs/namei.c:4499 __do_sys_symlinkat fs/namei.c:4515 [inline] __se_sys_symlinkat fs/namei.c:4512 [inline] __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4512 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (sb_internal#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1633 [inline] sb_start_intwrite include/linux/fs.h:1755 [inline] ocfs2_start_trans+0x26b/0x6c0 fs/ocfs2/journal.c:370 ocfs2_create_refcount_tree+0x33e/0x1220 fs/ocfs2/refcounttree.c:577 ocfs2_reflink_remap_blocks+0x2eb/0x1930 fs/ocfs2/refcounttree.c:4656 ocfs2_remap_file_range+0x4b4/0x730 fs/ocfs2/file.c:2739 vfs_copy_file_range+0xdd7/0x15e0 fs/read_write.c:1517 __do_sys_copy_file_range fs/read_write.c:1595 [inline] __se_sys_copy_file_range+0x321/0x490 fs/read_write.c:1558 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] ocfs2_reserve_suballoc_bits+0x165/0x4360 fs/ocfs2/suballoc.c:782 ocfs2_reserve_new_metadata_blocks+0x404/0x940 fs/ocfs2/suballoc.c:978 ocfs2_init_xattr_set_ctxt+0x2f8/0x6e0 fs/ocfs2/xattr.c:3277 ocfs2_xattr_set+0xb6d/0x11f0 fs/ocfs2/xattr.c:3634 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 ovl_do_setxattr fs/overlayfs/overlayfs.h:299 [inline] ovl_setxattr fs/overlayfs/overlayfs.h:311 [inline] ovl_init_uuid_xattr+0x47c/0x7c0 fs/overlayfs/util.c:730 ovl_fill_super+0x2941/0x3560 fs/overlayfs/super.c:1451 vfs_get_super fs/super.c:1346 [inline] get_tree_nodev+0xb5/0x140 fs/super.c:1365 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3371 do_mount fs/namespace.c:3711 [inline] __do_sys_mount fs/namespace.c:3920 [inline] __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4 --> 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]#4); *** DEADLOCK *** 3 locks held by syz.3.276/7557: #0: ffff888054b540e0 (&type->s_umount_key#75/1){+.+.}-{3:3}, at: alloc_super+0x1fa/0x920 fs/super.c:352 #1: ffff8880597909d8 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff8880597909d8 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: vfs_setxattr+0x145/0x2f0 fs/xattr.c:321 #2: ffff8880597906f8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_xattr_set+0x410/0x11f0 fs/ocfs2/xattr.c:3583 stack backtrace: CPU: 1 PID: 7557 Comm: syz.3.276 Not tainted 6.6.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] ocfs2_reserve_suballoc_bits+0x165/0x4360 fs/ocfs2/suballoc.c:782 ocfs2_reserve_new_metadata_blocks+0x404/0x940 fs/ocfs2/suballoc.c:978 ocfs2_init_xattr_set_ctxt+0x2f8/0x6e0 fs/ocfs2/xattr.c:3277 ocfs2_xattr_set+0xb6d/0x11f0 fs/ocfs2/xattr.c:3634 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 ovl_do_setxattr fs/overlayfs/overlayfs.h:299 [inline] ovl_setxattr fs/overlayfs/overlayfs.h:311 [inline] ovl_init_uuid_xattr+0x47c/0x7c0 fs/overlayfs/util.c:730 ovl_fill_super+0x2941/0x3560 fs/overlayfs/super.c:1451 vfs_get_super fs/super.c:1346 [inline] get_tree_nodev+0xb5/0x140 fs/super.c:1365 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3371 do_mount fs/namespace.c:3711 [inline] __do_sys_mount fs/namespace.c:3920 [inline] __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f545738ebe9 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:00007f54581fa038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f54575b5fa0 RCX: 00007f545738ebe9 RDX: 0000200000000b80 RSI: 0000200000000100 RDI: 0000000000000000 RBP: 00007f5457411e19 R08: 0000200000000080 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f54575b6038 R14: 00007f54575b5fa0 R15: 00007ffc20acf738