====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.9.1710/14250 is trying to acquire lock: ffff88804fb20270 (&wnd->rw_lock){++++}-{3:3}, at: ntfs_look_for_free_space+0xd4/0x600 fs/ntfs3/fsntfs.c:362 but task is already holding lock: ffff8880787e4410 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:848 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->file.run_lock#2){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 run_unpack_ex+0x7e6/0xba0 fs/ntfs3/run.c:1122 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x22e3/0x3760 fs/ntfs3/inode.c:534 dir_search_u+0x1e0/0x2b0 fs/ntfs3/dir.c:264 ntfs_lookup+0xfb/0x1f0 fs/ntfs3/namei.c:85 __lookup_slow+0x281/0x3b0 fs/namei.c:1702 lookup_slow+0x53/0x70 fs/namei.c:1719 walk_component+0x2be/0x3f0 fs/namei.c:2010 lookup_last fs/namei.c:2467 [inline] path_lookupat+0x169/0x440 fs/namei.c:2491 filename_lookup+0x1f4/0x510 fs/namei.c:2520 user_path_at_empty+0x42/0x60 fs/namei.c:2917 user_path_at include/linux/namei.h:57 [inline] path_getxattr+0xcd/0x400 fs/xattr.c:786 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&wnd->rw_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write_nested+0x9e/0x1f0 kernel/locking/rwsem.c:1689 ntfs_look_for_free_space+0xd4/0x600 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1c2/0x6d0 fs/ntfs3/attrib.c:159 attr_set_size+0x14a0/0x2c60 fs/ntfs3/attrib.c:575 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:850 ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335 ntfs_file_write_iter+0x3a7/0x700 fs/ntfs3/file.c:1118 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x43b/0x940 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __x64_sys_pwrite64+0x195/0x220 fs/read_write.c:706 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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.9.1710/14250: #0: ffff88804f878418 (sb_writers#15){.+.+}-{0:0}, at: vfs_write+0x20e/0x940 fs/read_write.c:580 #1: ffff8880787e4610 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:824 [inline] #1: ffff8880787e4610 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: ntfs_file_write_iter+0x23e/0x700 fs/ntfs3/file.c:1096 #2: ffff8880787e4360 (&ni->ni_lock#3/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1119 [inline] #2: ffff8880787e4360 (&ni->ni_lock#3/5){+.+.}-{3:3}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:847 #3: ffff8880787e4410 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:848 stack backtrace: CPU: 1 PID: 14250 Comm: syz.9.1710 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write_nested+0x9e/0x1f0 kernel/locking/rwsem.c:1689 ntfs_look_for_free_space+0xd4/0x600 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1c2/0x6d0 fs/ntfs3/attrib.c:159 attr_set_size+0x14a0/0x2c60 fs/ntfs3/attrib.c:575 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:850 ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335 ntfs_file_write_iter+0x3a7/0x700 fs/ntfs3/file.c:1118 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x43b/0x940 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __x64_sys_pwrite64+0x195/0x220 fs/read_write.c:706 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5e8458f749 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:00007f5e854ed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f5e847e5fa0 RCX: 00007f5e8458f749 RDX: 0000000000000002 RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f5e84613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000008fecc R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5e847e6038 R14: 00007f5e847e5fa0 R15: 00007fff14f4eef8 ntfs3: loop9: ino=0, "file0" failed to extend initialized size to 8fecc.