overlayfs: upper fs does not support tmpfile. overlayfs: upper fs does not support RENAME_WHITEOUT. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.171/5536 is trying to acquire lock: ffff0000f5433090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 but task is already holding lock: ffff0000e2dd96c0 (&type->i_mutex_dir_key#9/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] ffff0000e2dd96c0 (&type->i_mutex_dir_key#9/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:127 [inline] ffff0000e2dd96c0 (&type->i_mutex_dir_key#9/3){+.+.}-{3:3}, at: open_xa_dir+0x118/0x5d4 fs/reiserfs/xattr.c:152 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&type->i_mutex_dir_key#9/3){+.+.}-{3:3}: down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1689 inode_lock_nested include/linux/fs.h:793 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x118/0x5d4 fs/reiserfs/xattr.c:152 reiserfs_for_each_xattr+0x16c/0x68c fs/reiserfs/xattr.c:252 reiserfs_delete_xattrs+0x2c/0xa4 fs/reiserfs/xattr.c:364 reiserfs_evict_inode+0x1d8/0x3e8 fs/reiserfs/inode.c:53 evict+0x3c8/0x810 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x764/0x7f4 fs/inode.c:1860 reiserfs_mkdir+0x2e8/0x788 fs/reiserfs/namei.c:-1 vfs_mkdir+0x314/0x4d4 fs/namei.c:4106 do_mkdirat+0x1b4/0x3e0 fs/namei.c:4131 __do_sys_mkdirat fs/namei.c:4146 [inline] __se_sys_mkdirat fs/namei.c:4144 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&sbi->lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x1f38 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_mkdir+0x278/0x788 fs/reiserfs/namei.c:831 xattr_mkdir fs/reiserfs/xattr.c:76 [inline] open_xa_root fs/reiserfs/xattr.c:136 [inline] open_xa_dir+0x284/0x5d4 fs/reiserfs/xattr.c:152 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:395 reiserfs_xattr_set_handle+0xd8/0xd94 fs/reiserfs/xattr.c:533 reiserfs_xattr_set+0x388/0x4a8 fs/reiserfs/xattr.c:633 trusted_set+0x98/0xec fs/reiserfs/xattr_trusted.c:31 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 ovl_do_setxattr fs/overlayfs/overlayfs.h:252 [inline] ovl_setxattr fs/overlayfs/overlayfs.h:264 [inline] ovl_make_workdir fs/overlayfs/super.c:1435 [inline] ovl_get_workdir+0x950/0x1068 fs/overlayfs/super.c:1539 ovl_fill_super+0x139c/0x2294 fs/overlayfs/super.c:2095 mount_nodev+0x68/0x104 fs/super.c:1489 ovl_mount+0x3c/0x50 fs/overlayfs/super.c:2186 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3069 path_mount+0x5b4/0xe78 fs/namespace.c:3399 do_mount fs/namespace.c:3412 [inline] __do_sys_mount fs/namespace.c:3620 [inline] __se_sys_mount fs/namespace.c:3597 [inline] __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3597 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->i_mutex_dir_key#9/3); lock(&sbi->lock); lock(&type->i_mutex_dir_key#9/3); lock(&sbi->lock); *** DEADLOCK *** 4 locks held by syz.1.171/5536: #0: ffff0000d01c00e0 (&type->s_umount_key#65/1){+.+.}-{3:3}, at: alloc_super+0x1a4/0x804 fs/super.c:228 #1: ffff0000c3386460 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:393 #2: ffff0000e2ddaaa0 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #2: ffff0000e2ddaaa0 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: vfs_setxattr+0x138/0x2ac fs/xattr.c:308 #3: ffff0000e2dd96c0 (&type->i_mutex_dir_key#9/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #3: ffff0000e2dd96c0 (&type->i_mutex_dir_key#9/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:127 [inline] #3: ffff0000e2dd96c0 (&type->i_mutex_dir_key#9/3){+.+.}-{3:3}, at: open_xa_dir+0x118/0x5d4 fs/reiserfs/xattr.c:152 stack backtrace: CPU: 1 PID: 5536 Comm: syz.1.171 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x1f38 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_mkdir+0x278/0x788 fs/reiserfs/namei.c:831 xattr_mkdir fs/reiserfs/xattr.c:76 [inline] open_xa_root fs/reiserfs/xattr.c:136 [inline] open_xa_dir+0x284/0x5d4 fs/reiserfs/xattr.c:152 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:395 reiserfs_xattr_set_handle+0xd8/0xd94 fs/reiserfs/xattr.c:533 reiserfs_xattr_set+0x388/0x4a8 fs/reiserfs/xattr.c:633 trusted_set+0x98/0xec fs/reiserfs/xattr_trusted.c:31 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 ovl_do_setxattr fs/overlayfs/overlayfs.h:252 [inline] ovl_setxattr fs/overlayfs/overlayfs.h:264 [inline] ovl_make_workdir fs/overlayfs/super.c:1435 [inline] ovl_get_workdir+0x950/0x1068 fs/overlayfs/super.c:1539 ovl_fill_super+0x139c/0x2294 fs/overlayfs/super.c:2095 mount_nodev+0x68/0x104 fs/super.c:1489 ovl_mount+0x3c/0x50 fs/overlayfs/super.c:2186 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3069 path_mount+0x5b4/0xe78 fs/namespace.c:3399 do_mount fs/namespace.c:3412 [inline] __do_sys_mount fs/namespace.c:3620 [inline] __se_sys_mount fs/namespace.c:3597 [inline] __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3597 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585