syzbot

ocfs2: Slot 0 on device (7,0) was already allocated to this node!
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc5-syzkaller-00353-gcd802e7e5f1e #0 Not tainted
------------------------------------------------------
syz-executor370/5824 is trying to acquire lock:
ffff888075505be0 (&oi->ip_alloc_sem){+.+.}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x320 fs/ocfs2/refcounttree.c:932

but task is already holding lock:
ffff888075505c78 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x320 fs/ocfs2/refcounttree.c:931

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&oi->ip_xattr_sem){++++}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524
       ocfs2_xattr_get+0xdf/0x220 fs/ocfs2/xattr.c:1338
       __vfs_getxattr+0x3f1/0x430 fs/xattr.c:423
       smk_fetch+0xb4/0x140 security/smack/smack_lsm.c:290
       smack_d_instantiate+0x6f5/0x940 security/smack/smack_lsm.c:3607
       security_d_instantiate+0x10a/0x200 security/security.c:4079
       d_instantiate+0x55/0xa0 fs/dcache.c:1936
       ocfs2_mknod+0x1899/0x2050 fs/ocfs2/namei.c:450
       ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:673
       lookup_open fs/namei.c:3701 [inline]
       open_last_lookups fs/namei.c:3800 [inline]
       path_openat+0x14f1/0x3830 fs/namei.c:4036
       do_filp_open+0x1fa/0x410 fs/namei.c:4066
       do_sys_openat2+0x121/0x1c0 fs/open.c:1429
       do_sys_open fs/open.c:1444 [inline]
       __do_sys_creat fs/open.c:1522 [inline]
       __se_sys_creat fs/open.c:1516 [inline]
       __x64_sys_creat+0x8f/0xc0 fs/open.c:1516
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (jbd2_handle){.+.+}-{0:0}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       start_this_handle+0x1fa7/0x21c0 fs/jbd2/transaction.c:444
       jbd2__journal_start+0x2c1/0x5b0 fs/jbd2/transaction.c:501
       jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:540
       ocfs2_start_trans+0x376/0x6d0 fs/ocfs2/journal.c:374
       ocfs2_mknod+0xe93/0x2050 fs/ocfs2/namei.c:361
       ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:673
       lookup_open fs/namei.c:3701 [inline]
       open_last_lookups fs/namei.c:3800 [inline]
       path_openat+0x14f1/0x3830 fs/namei.c:4036
       do_filp_open+0x1fa/0x410 fs/namei.c:4066
       do_sys_openat2+0x121/0x1c0 fs/open.c:1429
       do_sys_open fs/open.c:1444 [inline]
       __do_sys_creat fs/open.c:1522 [inline]
       __se_sys_creat fs/open.c:1516 [inline]
       __x64_sys_creat+0x8f/0xc0 fs/open.c:1516
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524
       ocfs2_start_trans+0x36a/0x6d0 fs/ocfs2/journal.c:372
       ocfs2_mknod+0xe93/0x2050 fs/ocfs2/namei.c:361
       ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:673
       lookup_open fs/namei.c:3701 [inline]
       open_last_lookups fs/namei.c:3800 [inline]
       path_openat+0x14f1/0x3830 fs/namei.c:4036
       do_filp_open+0x1fa/0x410 fs/namei.c:4066
       do_sys_openat2+0x121/0x1c0 fs/open.c:1429
       do_sys_open fs/open.c:1444 [inline]
       __do_sys_creat fs/open.c:1522 [inline]
       __se_sys_creat fs/open.c:1516 [inline]
       __x64_sys_creat+0x8f/0xc0 fs/open.c:1516
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#2){.+.+}-{0:0}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       percpu_down_read include/linux/percpu-rwsem.h:52 [inline]
       __sb_start_write include/linux/fs.h:1783 [inline]
       sb_start_intwrite include/linux/fs.h:1966 [inline]
       ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:370
       ocfs2_orphan_for_truncate fs/ocfs2/file.c:396 [inline]
       ocfs2_truncate_file+0x643/0x1420 fs/ocfs2/file.c:500
       ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
       notify_change+0xb33/0xe40 fs/attr.c:552
       do_truncate+0x19a/0x220 fs/open.c:65
       handle_truncate fs/namei.c:3501 [inline]
       do_open fs/namei.c:3884 [inline]
       path_openat+0x306c/0x3830 fs/namei.c:4039
       do_filp_open+0x1fa/0x410 fs/namei.c:4066
       do_sys_openat2+0x121/0x1c0 fs/open.c:1429
       do_sys_open fs/open.c:1444 [inline]
       __do_sys_creat fs/open.c:1522 [inline]
       __se_sys_creat fs/open.c:1516 [inline]
       __x64_sys_creat+0x8f/0xc0 fs/open.c:1516
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_alloc_sem){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
       __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       ocfs2_try_remove_refcount_tree+0xb6/0x320 fs/ocfs2/refcounttree.c:932
       ocfs2_truncate_file+0xda0/0x1420 fs/ocfs2/file.c:521
       ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
       notify_change+0xb33/0xe40 fs/attr.c:552
       do_truncate+0x19a/0x220 fs/open.c:65
       handle_truncate fs/namei.c:3501 [inline]
       do_open fs/namei.c:3884 [inline]
       path_openat+0x306c/0x3830 fs/namei.c:4039
       do_filp_open+0x1fa/0x410 fs/namei.c:4066
       do_sys_openat2+0x121/0x1c0 fs/open.c:1429
       do_sys_open fs/open.c:1444 [inline]
       __do_sys_creat fs/open.c:1522 [inline]
       __se_sys_creat fs/open.c:1516 [inline]
       __x64_sys_creat+0x8f/0xc0 fs/open.c:1516
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 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_alloc_sem --> 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(&oi->ip_alloc_sem);

 *** DEADLOCK ***

3 locks held by syz-executor370/5824:
 #0: ffff8880789b6420 (sb_writers#8){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:556
 #1: ffff888075505f40 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #1: ffff888075505f40 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: do_truncate+0x186/0x220 fs/open.c:63
 #2: ffff888075505c78 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x320 fs/ocfs2/refcounttree.c:931

stack backtrace:
CPU: 1 UID: 0 PID: 5824 Comm: syz-executor370 Not tainted 6.15.0-rc5-syzkaller-00353-gcd802e7e5f1e #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:2079
 check_noncircular+0x134/0x160 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+0xb9b/0x2140 kernel/locking/lockdep.c:3909
 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
 ocfs2_try_remove_refcount_tree+0xb6/0x320 fs/ocfs2/refcounttree.c:932
 ocfs2_truncate_file+0xda0/0x1420 fs/ocfs2/file.c:521
 ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
 notify_change+0xb33/0xe40 fs/attr.c:552
 do_truncate+0x19a/0x220 fs/open.c:65
 handle_truncate fs/namei.c:3501 [inline]
 do_open fs/namei.c:3884 [inline]
 path_openat+0x306c/0x3830 fs/namei.c:4039
 do_filp_open+0x1fa/0x410 fs/namei.c:4066
 do_sys_openat2+0x121/0x1c0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_creat fs/open.c:1522 [inline]
 __se_sys_creat fs/open.c:1516 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1516
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2cee0f8ad9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffecbb3b1e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f2cee0f8ad9
RDX: 00007f2cee0f8ad9 RSI: 00000000000000a6 RDI: 0000200000000000
RBP: 0031656c69662f2e R08: 00005555579ff4c0 R09: 00005555579ff4c0
R10: 000000000000444c R11: 0000000000000206 R12: 00007ffecbb3b210
R13: 00007ffecbb3b438 R14: 431bde82d7b634db R15: 00007f2cee14103b
 </TASK>