syzbot

overlayfs: upper fs does not support tmpfile.
overlayfs: upper fs does not support RENAME_WHITEOUT.
======================================================
WARNING: possible circular locking dependency detected
6.14.0-syzkaller-05877-g1a9239bb4253 #0 Not tainted
------------------------------------------------------
syz.0.44/6234 is trying to acquire lock:
ffff8880550eb480 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
ffff8880550eb480 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: ocfs2_xattr_set+0xea2/0x1940 fs/ocfs2/xattr.c:3622

but task is already holding lock:
ffff88805e86bff8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x635/0x1940 fs/ocfs2/xattr.c:3583

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&oi->ip_xattr_sem){++++}-{4:4}:
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       down_write+0x9c/0x220 kernel/locking/rwsem.c:1577
       ocfs2_xattr_set_handle+0x53b/0xa20 fs/ocfs2/xattr.c:3501
       ocfs2_init_security_set+0xbd/0xd0 fs/ocfs2/xattr.c:7307
       ocfs2_mknod+0x1cd3/0x2b30 fs/ocfs2/namei.c:419
       ocfs2_create+0x1ad/0x480 fs/ocfs2/namei.c:673
       lookup_open fs/namei.c:3666 [inline]
       open_last_lookups fs/namei.c:3765 [inline]
       path_openat+0x194b/0x35d0 fs/namei.c:4001
       do_filp_open+0x284/0x4e0 fs/namei.c:4031
       do_sys_openat2+0x12b/0x1d0 fs/open.c:1429
       do_sys_open fs/open.c:1444 [inline]
       __do_sys_open fs/open.c:1452 [inline]
       __se_sys_open fs/open.c:1448 [inline]
       __x64_sys_open+0x226/0x280 fs/open.c:1448
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (jbd2_handle){++++}-{0:0}:
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       jbd2_journal_lock_updates+0xb2/0x370 fs/jbd2/transaction.c:865
       __ocfs2_flush_truncate_log+0x2ed/0x1240 fs/ocfs2/alloc.c:6029
       ocfs2_flush_truncate_log+0x4f/0x70 fs/ocfs2/alloc.c:6076
       ocfs2_sync_fs+0x136/0x3b0 fs/ocfs2/super.c:406
       sync_filesystem+0x1c8/0x230 fs/sync.c:66
       generic_shutdown_super+0x72/0x2d0 fs/super.c:621
       kill_block_super+0x44/0x90 fs/super.c:1710
       deactivate_locked_super+0xc4/0x130 fs/super.c:473
       cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435
       task_work_run+0x251/0x310 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+0x13f/0x340 kernel/entry/common.c:218
       do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
       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:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
       __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       down_write+0x9c/0x220 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:867 [inline]
       ocfs2_xattr_set+0xea2/0x1940 fs/ocfs2/xattr.c:3622
       __vfs_setxattr+0x468/0x4a0 fs/xattr.c:200
       __vfs_setxattr_noperm+0x12e/0x660 fs/xattr.c:234
       vfs_setxattr+0x223/0x430 fs/xattr.c:321
       ovl_do_setxattr fs/overlayfs/overlayfs.h:315 [inline]
       ovl_setxattr fs/overlayfs/overlayfs.h:327 [inline]
       ovl_make_workdir fs/overlayfs/super.c:715 [inline]
       ovl_get_workdir+0xea3/0x19e0 fs/overlayfs/super.c:827
       ovl_fill_super+0x1386/0x3720 fs/overlayfs/super.c:1401
       vfs_get_super fs/super.c:1280 [inline]
       get_tree_nodev+0xb7/0x140 fs/super.c:1299
       vfs_get_tree+0x90/0x2b0 fs/super.c:1759
       do_new_mount+0x2cf/0xb70 fs/namespace.c:3878
       do_mount fs/namespace.c:4218 [inline]
       __do_sys_mount fs/namespace.c:4429 [inline]
       __se_sys_mount+0x38c/0x400 fs/namespace.c:4406
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf3/0x230 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.0.44/6234:
 #0: ffff88807e2880e0 (&type->s_umount_key#96/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344
 #1: ffff8880129e6420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556
 #2: ffff88805e86c2c0 (&sb->s_type->i_mutex_key#20){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #2: ffff88805e86c2c0 (&sb->s_type->i_mutex_key#20){++++}-{4:4}, at: vfs_setxattr+0x1e3/0x430 fs/xattr.c:320
 #3: ffff88805e86bff8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x635/0x1940 fs/ocfs2/xattr.c:3583

stack backtrace:
CPU: 0 UID: 0 PID: 6234 Comm: syz.0.44 Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079
 check_noncircular+0x142/0x160 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+0xa69/0x24e0 kernel/locking/lockdep.c:3909
 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 down_write+0x9c/0x220 kernel/locking/rwsem.c:1577
 inode_lock include/linux/fs.h:867 [inline]
 ocfs2_xattr_set+0xea2/0x1940 fs/ocfs2/xattr.c:3622
 __vfs_setxattr+0x468/0x4a0 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12e/0x660 fs/xattr.c:234
 vfs_setxattr+0x223/0x430 fs/xattr.c:321
 ovl_do_setxattr fs/overlayfs/overlayfs.h:315 [inline]
 ovl_setxattr fs/overlayfs/overlayfs.h:327 [inline]
 ovl_make_workdir fs/overlayfs/super.c:715 [inline]
 ovl_get_workdir+0xea3/0x19e0 fs/overlayfs/super.c:827
 ovl_fill_super+0x1386/0x3720 fs/overlayfs/super.c:1401
 vfs_get_super fs/super.c:1280 [inline]
 get_tree_nodev+0xb7/0x140 fs/super.c:1299
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f15c338d169
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:00007f15c4241038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f15c35a5fa0 RCX: 00007f15c338d169
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007f15c340e2a0 R08: 0000200000000200 R09: 0000000000000000
R10: 00000000000000c9 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f15c35a5fa0 R15: 00007fff2437fa98
 </TASK>
overlayfs: upper fs missing required features.