syzbot

ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
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.0.17/5951 is trying to acquire lock:
ffff88805c332d00 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
ffff88805c332d00 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_local_alloc_bits+0x11f/0x26f0 fs/ocfs2/localalloc.c:636

but task is already holding lock:
ffff88805c323a98 (&oi->ip_xattr_sem){+.+.}-{4:4}, at: ocfs2_xattr_set+0x475/0x13e0 fs/ocfs2/xattr.c:3614

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&oi->ip_xattr_sem){+.+.}-{4:4}:
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
       ocfs2_xattr_set_handle+0x3e6/0x810 fs/ocfs2/xattr.c:3532
       ocfs2_init_security_set+0xbd/0xe0 fs/ocfs2/xattr.c:7342
       ocfs2_symlink+0x1bde/0x2680 fs/ocfs2/namei.c:2014
       vfs_symlink+0x195/0x340 fs/namei.c:5615
       filename_symlinkat+0x1cd/0x420 fs/namei.c:5640
       __do_sys_symlinkat fs/namei.c:5660 [inline]
       __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5655
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x97/0x200 kernel/locking/rwsem.c:1537
       ocfs2_start_trans+0x3ac/0x700 fs/ocfs2/journal.c:369
       ocfs2_block_group_alloc fs/ocfs2/suballoc.c:754 [inline]
       ocfs2_reserve_suballoc_bits+0x7ae/0x4940 fs/ocfs2/suballoc.c:903
       ocfs2_reserve_new_metadata_blocks+0x415/0x9a0 fs/ocfs2/suballoc.c:1053
       ocfs2_calc_security_init+0x37a/0x5d0 fs/ocfs2/xattr.c:594
       ocfs2_symlink+0xf84/0x2680 fs/ocfs2/namei.c:1912
       vfs_symlink+0x195/0x340 fs/namei.c:5615
       filename_symlinkat+0x1cd/0x420 fs/namei.c:5640
       __do_sys_symlinkat fs/namei.c:5660 [inline]
       __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5655
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#2){.+.+}-{0:0}:
       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/super.h:19 [inline]
       sb_start_intwrite include/linux/fs/super.h:177 [inline]
       ocfs2_start_trans+0x2ac/0x700 fs/ocfs2/journal.c:367
       ocfs2_symlink+0x10af/0x2680 fs/ocfs2/namei.c:1931
       vfs_symlink+0x195/0x340 fs/namei.c:5615
       filename_symlinkat+0x1cd/0x420 fs/namei.c:5640
       __do_sys_symlinkat fs/namei.c:5660 [inline]
       __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5655
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
       inode_lock include/linux/fs.h:1028 [inline]
       ocfs2_reserve_local_alloc_bits+0x11f/0x26f0 fs/ocfs2/localalloc.c:636
       ocfs2_reserve_clusters_with_limit+0x1b9/0xc20 fs/ocfs2/suballoc.c:1237
       ocfs2_init_xattr_set_ctxt+0x371/0x790 fs/ocfs2/xattr.c:3317
       ocfs2_xattr_set+0xc42/0x13e0 fs/ocfs2/xattr.c:3665
       __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
       __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
       vfs_setxattr+0x163/0x370 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:728 [inline]
       ovl_get_workdir fs/overlayfs/super.c:840 [inline]
       ovl_fill_super_creds fs/overlayfs/super.c:1453 [inline]
       ovl_fill_super+0x4b20/0x5e00 fs/overlayfs/super.c:1564
       vfs_get_super fs/super.c:1327 [inline]
       get_tree_nodev+0xbb/0x150 fs/super.c:1346
       vfs_get_tree+0x92/0x2a0 fs/super.c:1754
       fc_mount fs/namespace.c:1193 [inline]
       do_new_mount_fc fs/namespace.c:3763 [inline]
       do_new_mount+0x341/0xd30 fs/namespace.c:3839
       do_mount fs/namespace.c:4172 [inline]
       __do_sys_mount fs/namespace.c:4361 [inline]
       __se_sys_mount+0x31d/0x420 fs/namespace.c:4338
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x14d/0xf80 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[LOCAL_ALLOC_SYSTEM_INODE] --> &journal->j_trans_barrier --> &oi->ip_xattr_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&oi->ip_xattr_sem);
                               lock(&journal->j_trans_barrier);
                               lock(&oi->ip_xattr_sem);
  lock(&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]);

 *** DEADLOCK ***

4 locks held by syz.0.17/5951:
 #0: ffff8880356100d0 (&type->s_umount_key#56/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xac0 fs/super.c:345
 #1: ffff88803203e480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
 #2: ffff88805c323dc0 (&sb->s_type->i_mutex_key#26){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
 #2: ffff88805c323dc0 (&sb->s_type->i_mutex_key#26){++++}-{4:4}, at: vfs_setxattr+0x13e/0x370 fs/xattr.c:320
 #3: ffff88805c323a98 (&oi->ip_xattr_sem){+.+.}-{4:4}, at: ocfs2_xattr_set+0x475/0x13e0 fs/ocfs2/xattr.c:3614

stack backtrace:
CPU: 1 UID: 0 PID: 5951 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
 inode_lock include/linux/fs.h:1028 [inline]
 ocfs2_reserve_local_alloc_bits+0x11f/0x26f0 fs/ocfs2/localalloc.c:636
 ocfs2_reserve_clusters_with_limit+0x1b9/0xc20 fs/ocfs2/suballoc.c:1237
 ocfs2_init_xattr_set_ctxt+0x371/0x790 fs/ocfs2/xattr.c:3317
 ocfs2_xattr_set+0xc42/0x13e0 fs/ocfs2/xattr.c:3665
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x163/0x370 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:728 [inline]
 ovl_get_workdir fs/overlayfs/super.c:840 [inline]
 ovl_fill_super_creds fs/overlayfs/super.c:1453 [inline]
 ovl_fill_super+0x4b20/0x5e00 fs/overlayfs/super.c:1564
 vfs_get_super fs/super.c:1327 [inline]
 get_tree_nodev+0xbb/0x150 fs/super.c:1346
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3763 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3839
 do_mount fs/namespace.c:4172 [inline]
 __do_sys_mount fs/namespace.c:4361 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4338
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f05285dc799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff79ef3c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0528855fa0 RCX: 00007f05285dc799
RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 0000000000000000
RBP: 00007f0528672bd9 R08: 0000200000000400 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0528855fac R14: 00007f0528855fa0 R15: 00007f0528855fa0
 </TASK>
overlayfs: upper fs missing required features.