syzbot

======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.7.2622/15966 is trying to acquire lock:
ffff88802a9cc640 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_orphan_for_truncate fs/ocfs2/file.c:397 [inline]
ffff88802a9cc640 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_truncate_file+0x634/0x14b0 fs/ocfs2/file.c:506

but task is already holding lock:
ffff88804756a258 (&oi->ip_alloc_sem){+.+.}-{4:4}, at: ocfs2_truncate_file+0x348/0x14b0 fs/ocfs2/file.c:477

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&oi->ip_alloc_sem){+.+.}-{4:4}:
       down_write+0x96/0x200 kernel/locking/rwsem.c:1631
       ocfs2_try_remove_refcount_tree+0xb6/0x360 fs/ocfs2/refcounttree.c:932
       ocfs2_xattr_set+0x639/0x13a0 fs/ocfs2/xattr.c:3713
       ocfs2_set_acl+0x6fd/0x7b0 fs/ocfs2/acl.c:255
       ocfs2_iop_set_acl+0x1b1/0x2b0 fs/ocfs2/acl.c:287
       set_posix_acl fs/posix_acl.c:955 [inline]
       vfs_set_acl+0x8a0/0xb50 fs/posix_acl.c:1134
       do_setxattr fs/xattr.c:659 [inline]
       filename_setxattr+0x305/0x630 fs/xattr.c:690
       path_setxattrat+0x408/0x450 fs/xattr.c:734
       __do_sys_setxattr fs/xattr.c:768 [inline]
       __se_sys_setxattr fs/xattr.c:764 [inline]
       __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:764
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&oi->ip_xattr_sem){++++}-{4:4}:
       down_read+0x4a/0x330 kernel/locking/rwsem.c:1574
       ocfs2_init_acl+0x2fd/0x7e0 fs/ocfs2/acl.c:367
       ocfs2_mknod+0x166a/0x2240 fs/ocfs2/namei.c:414
       ocfs2_mkdir+0x181/0x460 fs/ocfs2/namei.c:660
       vfs_mkdir+0x406/0x620 fs/namei.c:5272
       filename_mkdirat+0x285/0x510 fs/namei.c:5305
       __do_sys_mkdirat fs/namei.c:5326 [inline]
       __se_sys_mkdirat+0x35/0x150 fs/namei.c:5323
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x4a/0x330 kernel/locking/rwsem.c:1574
       ocfs2_start_trans+0x3ab/0x700 fs/ocfs2/journal.c:369
       ocfs2_mknod+0x116a/0x2240 fs/ocfs2/namei.c:365
       ocfs2_mkdir+0x181/0x460 fs/ocfs2/namei.c:660
       vfs_mkdir+0x406/0x620 fs/namei.c:5272
       filename_mkdirat+0x285/0x510 fs/namei.c:5305
       __do_sys_mkdirat fs/namei.c:5326 [inline]
       __se_sys_mkdirat+0x35/0x150 fs/namei.c:5323
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (sb_internal#2){.+.+}-{0:0}:
       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+0x1520/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
       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_orphan_for_truncate fs/ocfs2/file.c:397 [inline]
       ocfs2_truncate_file+0x634/0x14b0 fs/ocfs2/file.c:506
       ocfs2_setattr+0x1641/0x1d10 fs/ocfs2/file.c:1224
       notify_change+0xbba/0xea0 fs/attr.c:556
       do_truncate+0x1c2/0x250 fs/open.c:68
       handle_truncate fs/namei.c:4305 [inline]
       do_open fs/namei.c:4704 [inline]
       path_openat+0x2fed/0x3830 fs/namei.c:4859
       do_file_open+0x23e/0x4a0 fs/namei.c:4888
       do_sys_openat2+0x115/0x200 fs/open.c:1368
       do_sys_open fs/open.c:1374 [inline]
       __do_sys_openat fs/open.c:1390 [inline]
       __se_sys_openat fs/open.c:1385 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1385
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 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:
  sb_internal#2 --> &oi->ip_xattr_sem --> &oi->ip_alloc_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&oi->ip_alloc_sem);
                               lock(&oi->ip_xattr_sem);
                               lock(&oi->ip_alloc_sem);
  rlock(sb_internal#2);

 *** DEADLOCK ***

3 locks held by syz.7.2622/15966:
 #0: ffff88802a9cc450 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
 #1: ffff88804756a5a0 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline]
 #1: ffff88804756a5a0 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: do_truncate+0x18f/0x250 fs/open.c:63
 #2: ffff88804756a258 (&oi->ip_alloc_sem){+.+.}-{4:4}, at: ocfs2_truncate_file+0x348/0x14b0 fs/ocfs2/file.c:477

stack backtrace:
CPU: 0 UID: 0 PID: 15966 Comm: syz.7.2622 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
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+0x1520/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 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_orphan_for_truncate fs/ocfs2/file.c:397 [inline]
 ocfs2_truncate_file+0x634/0x14b0 fs/ocfs2/file.c:506
 ocfs2_setattr+0x1641/0x1d10 fs/ocfs2/file.c:1224
 notify_change+0xbba/0xea0 fs/attr.c:556
 do_truncate+0x1c2/0x250 fs/open.c:68
 handle_truncate fs/namei.c:4305 [inline]
 do_open fs/namei.c:4704 [inline]
 path_openat+0x2fed/0x3830 fs/namei.c:4859
 do_file_open+0x23e/0x4a0 fs/namei.c:4888
 do_sys_openat2+0x115/0x200 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_openat fs/open.c:1390 [inline]
 __se_sys_openat fs/open.c:1385 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1385
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fec4939de59
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:00007fec4a2d2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fec49626180 RCX: 00007fec4939de59
RDX: 0000000000103a42 RSI: 0000200000000440 RDI: ffffffffffffff9c
RBP: 00007fec49433e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fec49626218 R14: 00007fec49626180 R15: 00007ffded9065c8
 </TASK>