====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc6-syzkaller-00188-gfee3e843b309 #0 Not tainted ------------------------------------------------------ syz.1.9356/27336 is trying to acquire lock: ffff8880555643c8 (&ni->file.run_lock#2){++++}-{4:4}, at: run_unpack_ex+0x671/0x740 fs/ntfs3/run.c:1119 but task is already holding lock: ffff888056072270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x41e/0x740 fs/ntfs3/run.c:1100 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&wnd->rw_lock){++++}-{4:4}: 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_extend_mft+0x15c/0x430 fs/ntfs3/fsntfs.c:512 ntfs_look_free_mft+0x695/0xe10 fs/ntfs3/fsntfs.c:709 ntfs_create_inode+0x3b1/0x40f0 fs/ntfs3/inode.c:1268 ntfs_create+0x3c/0x50 fs/ntfs3/namei.c:110 lookup_open.isra.0+0x11d3/0x1580 fs/namei.c:3701 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 (&ni->file.run_lock#2){++++}-{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_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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&wnd->rw_lock); lock(&ni->file.run_lock#2); lock(&wnd->rw_lock); rlock(&ni->file.run_lock#2); *** DEADLOCK *** 4 locks held by syz.1.9356/27336: #0: ffff88807ba4e420 (sb_writers#25){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:3789 [inline] #0: ffff88807ba4e420 (sb_writers#25){.+.+}-{0:0}, at: path_openat+0x1f85/0x2d40 fs/namei.c:4036 #1: ffff8880555c0398 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff8880555c0398 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: open_last_lookups fs/namei.c:3797 [inline] #1: ffff8880555c0398 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: path_openat+0x15a5/0x2d40 fs/namei.c:4036 #2: ffff8880555c0100 (&ni->ni_lock#3/6){+.+.}-{4:4}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1110 [inline] #2: ffff8880555c0100 (&ni->ni_lock#3/6){+.+.}-{4:4}, at: ntfs_lookup+0x1b8/0x2a0 fs/ntfs3/namei.c:84 #3: ffff888056072270 (&wnd->rw_lock){++++}-{4:4}, at: run_unpack_ex+0x41e/0x740 fs/ntfs3/run.c:1100 stack backtrace: CPU: 0 UID: 0 PID: 27336 Comm: syz.1.9356 Not tainted 6.15.0-rc6-syzkaller-00188-gfee3e843b309 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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_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 RIP: 0033:0x7fb921f8e969 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:00007fb922e58038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fb9221b5fa0 RCX: 00007fb921f8e969 RDX: 0000000000000042 RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007fb922010ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001fe R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb9221b5fa0 R15: 00007ffddef61fc8