====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 Not tainted ------------------------------------------------------ syz.5.629/8807 is trying to acquire lock: ffff88807a4c0270 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0xcc/0x720 fs/ntfs3/fsntfs.c:362 but task is already holding lock: ffff888057c23c70 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x119/0x220 fs/ntfs3/inode.c:855 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+0x9b/0x480 kernel/locking/rwsem.c:1524 run_unpack_ex+0x671/0x740 fs/ntfs3/run.c:1119 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0xd97/0x3ab0 fs/ntfs3/inode.c:540 dir_search_u+0x163/0x3a0 fs/ntfs3/dir.c:264 ntfs_lookup+0x1c5/0x2a0 fs/ntfs3/namei.c:85 lookup_open.isra.0+0x4da/0x1580 fs/namei.c:3679 open_last_lookups fs/namei.c:3800 [inline] path_openat+0x905/0x2d40 fs/namei.c:4036 do_filp_open+0x20b/0x470 fs/namei.c:4066 do_sys_openat2+0x11b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_write_nested+0x96/0x210 kernel/locking/rwsem.c:1693 ntfs_look_for_free_space+0xcc/0x720 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x3ff/0x6f0 fs/ntfs3/attrib.c:159 attr_set_size+0x15ae/0x2c50 fs/ntfs3/attrib.c:574 ntfs_set_size+0x13d/0x220 fs/ntfs3/inode.c:857 ntfs_extend+0x7dd/0xa70 fs/ntfs3/file.c:427 ntfs_file_write_iter+0x303/0x2380 fs/ntfs3/file.c:1282 iter_file_splice_write+0x91f/0x1150 fs/splice.c:738 ntfs_file_splice_write+0x71/0xa0 fs/ntfs3/file.c:1401 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x192/0x6c0 fs/splice.c:1158 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1227 do_sendfile+0xafd/0xe50 fs/read_write.c:1368 __do_sys_sendfile64 fs/read_write.c:1429 [inline] __se_sys_sendfile64 fs/read_write.c:1415 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1415 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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.5.629/8807: #0: ffff88804d454420 (sb_writers#32){.+.+}-{0:0}, at: splice_direct_to_actor+0x345/0xa30 fs/splice.c:1102 #1: ffff888057c23e58 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] #1: ffff888057c23e58 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: ntfs_file_write_iter+0xde/0x2380 fs/ntfs3/file.c:1250 #2: ffff888057c23bc0 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1105 [inline] #2: ffff888057c23bc0 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_set_size+0x111/0x220 fs/ntfs3/inode.c:854 #3: ffff888057c23c70 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x119/0x220 fs/ntfs3/inode.c:855 stack backtrace: CPU: 0 UID: 0 PID: 8807 Comm: syz.5.629 Not tainted 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079 check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_write_nested+0x96/0x210 kernel/locking/rwsem.c:1693 ntfs_look_for_free_space+0xcc/0x720 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x3ff/0x6f0 fs/ntfs3/attrib.c:159 attr_set_size+0x15ae/0x2c50 fs/ntfs3/attrib.c:574 ntfs_set_size+0x13d/0x220 fs/ntfs3/inode.c:857 ntfs_extend+0x7dd/0xa70 fs/ntfs3/file.c:427 ntfs_file_write_iter+0x303/0x2380 fs/ntfs3/file.c:1282 iter_file_splice_write+0x91f/0x1150 fs/splice.c:738 ntfs_file_splice_write+0x71/0xa0 fs/ntfs3/file.c:1401 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x192/0x6c0 fs/splice.c:1158 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1227 do_sendfile+0xafd/0xe50 fs/read_write.c:1368 __do_sys_sendfile64 fs/read_write.c:1429 [inline] __se_sys_sendfile64 fs/read_write.c:1415 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1415 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6f1658e969 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:00007f6f173b9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f6f167b5fa0 RCX: 00007f6f1658e969 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f6f16610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6f167b5fa0 R15: 00007ffea8aeafa8