====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.9.405/9131 is trying to acquire lock: ffff88805b132258 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xd9/0x650 fs/ntfs3/fsntfs.c:362 but task is already holding lock: ffff88805f516580 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:861 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->file.run_lock#2){++++}-{4:4}: down_read+0x97/0x200 kernel/locking/rwsem.c:1537 run_unpack_ex+0x7fa/0xb90 fs/ntfs3/run.c:1135 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x2416/0x38f0 fs/ntfs3/inode.c:542 dir_search_u+0x1fd/0x2e0 fs/ntfs3/dir.c:265 ntfs_lookup+0x100/0x1d0 fs/ntfs3/namei.c:85 __lookup_slow+0x2d2/0x440 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 walk_component fs/namei.c:2279 [inline] lookup_last fs/namei.c:2780 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2804 filename_lookup+0x256/0x5d0 fs/namei.c:2833 do_sys_truncate+0xbb/0x1c0 fs/open.c:140 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:152 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 (&wnd->rw_lock){++++}-{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+0x106/0x330 kernel/locking/lockdep.c:5868 down_write_nested+0x3e/0x60 kernel/locking/rwsem.c:1706 ntfs_look_for_free_space+0xd9/0x650 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1bd/0x6b0 fs/ntfs3/attrib.c:159 attr_set_size+0x14cf/0x2cf0 fs/ntfs3/attrib.c:574 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:863 ntfs_extend+0x1d9/0x9c0 fs/ntfs3/file.c:435 ntfs_file_write_iter+0x424/0x870 fs/ntfs3/file.c:1314 iter_file_splice_write+0x9a0/0x1100 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x104/0x160 fs/splice.c:1161 splice_direct_to_actor+0x545/0xc80 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x19b/0x2a0 fs/splice.c:1230 do_sendfile+0x547/0x7e0 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419 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: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ni->file.run_lock#2); lock(&wnd->rw_lock); lock(&ni->file.run_lock#2); lock(&wnd->rw_lock); *** DEADLOCK *** 4 locks held by syz.9.405/9131: #0: ffff88803b2ee480 (sb_writers#16){++++}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1160 #1: ffff88805f516798 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:1058 [inline] #1: ffff88805f516798 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: ntfs_file_write_iter+0x7d/0x870 fs/ntfs3/file.c:1282 #2: ffff88805f5164e0 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline] #2: ffff88805f5164e0 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:860 #3: ffff88805f516580 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:861 stack backtrace: CPU: 0 UID: 0 PID: 9131 Comm: syz.9.405 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: 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+0x106/0x330 kernel/locking/lockdep.c:5868 down_write_nested+0x3e/0x60 kernel/locking/rwsem.c:1706 ntfs_look_for_free_space+0xd9/0x650 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1bd/0x6b0 fs/ntfs3/attrib.c:159 attr_set_size+0x14cf/0x2cf0 fs/ntfs3/attrib.c:574 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:863 ntfs_extend+0x1d9/0x9c0 fs/ntfs3/file.c:435 ntfs_file_write_iter+0x424/0x870 fs/ntfs3/file.c:1314 iter_file_splice_write+0x9a0/0x1100 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x104/0x160 fs/splice.c:1161 splice_direct_to_actor+0x545/0xc80 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x19b/0x2a0 fs/splice.c:1230 do_sendfile+0x547/0x7e0 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419 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: 0033:0x7f5691ddbf79 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:00007f5690036028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5692055fa0 RCX: 00007f5691ddbf79 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f5691e727e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5692056038 R14: 00007f5692055fa0 R15: 00007fff3b647468