syzbot

ocfs2: Mounting device (7,6) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc1-syzkaller #0 Not tainted
------------------------------------------------------
syz.6.6261/28898 is trying to acquire lock:
ffff88803b9986f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_calc_xattr_init+0x20a/0xd80 fs/ocfs2/xattr.c:627

but task is already holding lock:
ffff88803d9a1800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
ffff88803d9a1800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x15e/0x4640 fs/ocfs2/suballoc.c:788

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:867 [inline]
       ocfs2_remove_inode fs/ocfs2/inode.c:669 [inline]
       ocfs2_wipe_inode fs/ocfs2/inode.c:832 [inline]
       ocfs2_delete_inode fs/ocfs2/inode.c:1093 [inline]
       ocfs2_evict_inode+0x153d/0x40e0 fs/ocfs2/inode.c:1230
       evict+0x504/0x9c0 fs/inode.c:810
       ocfs2_dentry_iput+0x247/0x370 fs/ocfs2/dcache.c:407
       __dentry_kill+0x209/0x660 fs/dcache.c:669
       dput+0x19f/0x2b0 fs/dcache.c:911
       ovl_check_rename_whiteout fs/overlayfs/super.c:605 [inline]
       ovl_make_workdir fs/overlayfs/super.c:704 [inline]
       ovl_get_workdir+0xa78/0x1730 fs/overlayfs/super.c:827
       ovl_fill_super+0x1386/0x35d0 fs/overlayfs/super.c:1406
       vfs_get_super fs/super.c:1323 [inline]
       get_tree_nodev+0xbb/0x150 fs/super.c:1342
       vfs_get_tree+0x92/0x2b0 fs/super.c:1802
       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

-> #2 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:867 [inline]
       ocfs2_del_inode_from_orphan+0x134/0x740 fs/ocfs2/namei.c:2727
       ocfs2_dio_end_io_write fs/ocfs2/aops.c:2303 [inline]
       ocfs2_dio_end_io+0x479/0x10f0 fs/ocfs2/aops.c:2401
       dio_complete+0x25b/0x790 fs/direct-io.c:281
       __blockdev_direct_IO+0x2db6/0x33d0 fs/direct-io.c:1303
       ocfs2_direct_IO+0x25f/0x2d0 fs/ocfs2/aops.c:2438
       generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4046
       __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4215
       ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469
       do_iter_readv_writev+0x56e/0x7f0 fs/read_write.c:-1
       vfs_writev+0x31a/0x960 fs/read_write.c:1057
       do_pwritev fs/read_write.c:1153 [inline]
       __do_sys_pwritev2 fs/read_write.c:1211 [inline]
       __se_sys_pwritev2+0x179/0x290 fs/read_write.c:1202
       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 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       ocfs2_try_remove_refcount_tree+0xb6/0x320 fs/ocfs2/refcounttree.c:932
       ocfs2_xattr_set+0x595/0x11f0 fs/ocfs2/xattr.c:3669
       __vfs_removexattr+0x431/0x470 fs/xattr.c:518
       __vfs_removexattr_locked+0x1ed/0x230 fs/xattr.c:553
       vfs_removexattr+0x80/0x1b0 fs/xattr.c:575
       ovl_do_removexattr fs/overlayfs/overlayfs.h:333 [inline]
       ovl_removexattr fs/overlayfs/overlayfs.h:341 [inline]
       ovl_make_workdir fs/overlayfs/super.c:747 [inline]
       ovl_get_workdir+0xcc2/0x1730 fs/overlayfs/super.c:827
       ovl_fill_super+0x1386/0x35d0 fs/overlayfs/super.c:1406
       vfs_get_super fs/super.c:1323 [inline]
       get_tree_nodev+0xbb/0x150 fs/super.c:1342
       vfs_get_tree+0x92/0x2b0 fs/super.c:1802
       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

-> #0 (&oi->ip_xattr_sem){++++}-{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_read+0x46/0x2e0 kernel/locking/rwsem.c:1524
       ocfs2_calc_xattr_init+0x20a/0xd80 fs/ocfs2/xattr.c:627
       ocfs2_mknod+0xc92/0x2050 fs/ocfs2/namei.c:330
       ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:656
       vfs_mkdir+0x306/0x510 fs/namei.c:4366
       do_mkdirat+0x247/0x590 fs/namei.c:4399
       __do_sys_mkdir fs/namei.c:4421 [inline]
       __se_sys_mkdir fs/namei.c:4419 [inline]
       __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4419
       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:
  &oi->ip_xattr_sem --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type] --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4);
                               lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);
                               lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4);
  rlock(&oi->ip_xattr_sem);

 *** DEADLOCK ***

3 locks held by syz.6.6261/28898:
 #0: ffff8880234c6428 (sb_writers#36){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
 #1: ffff88803b9989c0 (&type->i_mutex_dir_key#23/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
 #1: ffff88803b9989c0 (&type->i_mutex_dir_key#23/1){+.+.}-{4:4}, at: filename_create+0x1f9/0x470 fs/namei.c:4139
 #2: ffff88803d9a1800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #2: ffff88803d9a1800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x15e/0x4640 fs/ocfs2/suballoc.c:788

stack backtrace:
CPU: 0 UID: 0 PID: 28898 Comm: syz.6.6261 Not tainted 6.16.0-rc1-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 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_read+0x46/0x2e0 kernel/locking/rwsem.c:1524
 ocfs2_calc_xattr_init+0x20a/0xd80 fs/ocfs2/xattr.c:627
 ocfs2_mknod+0xc92/0x2050 fs/ocfs2/namei.c:330
 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:656
 vfs_mkdir+0x306/0x510 fs/namei.c:4366
 do_mkdirat+0x247/0x590 fs/namei.c:4399
 __do_sys_mkdir fs/namei.c:4421 [inline]
 __se_sys_mkdir fs/namei.c:4419 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4419
 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: 0033:0x7fc47218e929
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:00007fc4730a2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fc4723b5fa0 RCX: 00007fc47218e929
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000200000000080
RBP: 00007fc472210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc4723b5fa0 R15: 00007ffd91fc05e8
 </TASK>