====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.9.4063/23660 is trying to acquire lock: ffff88807ccb8270 (&wnd->rw_lock){++++}-{4:4}, at: mark_as_free_ex+0x4d/0x430 fs/ntfs3/fsntfs.c:2464 but task is already holding lock: ffff888069d988f8 (&ni->file.run_lock#2){++++}-{4:4}, at: attr_collapse_range+0x3bb/0x1470 fs/ntfs3/attrib.c:1904 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/0x460 kernel/locking/rwsem.c:1537 run_unpack_ex+0x671/0x740 fs/ntfs3/run.c:1124 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0xda0/0x3a90 fs/ntfs3/inode.c:541 ntfs_dir_emit fs/ntfs3/dir.c:337 [inline] ntfs_read_hdr+0x8dd/0xaf0 fs/ntfs3/dir.c:385 ntfs_readdir+0x6cd/0x10b0 fs/ntfs3/dir.c:496 iterate_dir+0x296/0xaf0 fs/readdir.c:108 __do_sys_getdents fs/readdir.c:326 [inline] __se_sys_getdents fs/readdir.c:312 [inline] __x64_sys_getdents+0x13c/0x2b0 fs/readdir.c:312 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/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+0x1542/0x22f0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825 down_write_nested+0x96/0x210 kernel/locking/rwsem.c:1706 mark_as_free_ex+0x4d/0x430 fs/ntfs3/fsntfs.c:2464 run_deallocate_ex+0x1f4/0x310 fs/ntfs3/attrib.c:122 attr_collapse_range+0xa3f/0x1470 fs/ntfs3/attrib.c:1972 ntfs_fallocate+0xcc4/0x1170 fs/ntfs3/file.c:645 vfs_fallocate+0x5b4/0x10e0 fs/open.c:339 ksys_fallocate fs/open.c:363 [inline] __do_sys_fallocate fs/open.c:368 [inline] __se_sys_fallocate fs/open.c:366 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:366 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/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 *** 5 locks held by syz.9.4063/23660: #0: ffff88802a81a420 (sb_writers#37){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:363 [inline] #0: ffff88802a81a420 (sb_writers#37){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:368 [inline] #0: ffff88802a81a420 (sb_writers#37){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:366 [inline] #0: ffff88802a81a420 (sb_writers#37){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd5/0x150 fs/open.c:366 #1: ffff888069d98ae0 (&sb->s_type->i_mutex_key#45){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] #1: ffff888069d98ae0 (&sb->s_type->i_mutex_key#45){+.+.}-{4:4}, at: ntfs_fallocate+0x28e/0x1170 fs/ntfs3/file.c:560 #2: ffff888069d98c80 (mapping.invalidate_lock#11){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:1082 [inline] #2: ffff888069d98c80 (mapping.invalidate_lock#11){++++}-{4:4}, at: ntfs_fallocate+0x90d/0x1170 fs/ntfs3/file.c:574 #3: ffff888069d98848 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] #3: ffff888069d98848 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_fallocate+0xcaa/0x1170 fs/ntfs3/file.c:644 #4: ffff888069d988f8 (&ni->file.run_lock#2){++++}-{4:4}, at: attr_collapse_range+0x3bb/0x1470 fs/ntfs3/attrib.c:1904 stack backtrace: CPU: 0 UID: 0 PID: 23660 Comm: syz.9.4063 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x2db/0x410 kernel/locking/lockdep.c:2043 check_noncircular+0x146/0x160 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+0x1542/0x22f0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825 down_write_nested+0x96/0x210 kernel/locking/rwsem.c:1706 mark_as_free_ex+0x4d/0x430 fs/ntfs3/fsntfs.c:2464 run_deallocate_ex+0x1f4/0x310 fs/ntfs3/attrib.c:122 attr_collapse_range+0xa3f/0x1470 fs/ntfs3/attrib.c:1972 ntfs_fallocate+0xcc4/0x1170 fs/ntfs3/file.c:645 vfs_fallocate+0x5b4/0x10e0 fs/open.c:339 ksys_fallocate fs/open.c:363 [inline] __do_sys_fallocate fs/open.c:368 [inline] __se_sys_fallocate fs/open.c:366 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:366 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe78318f749 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:00007fe783f7a038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fe7833e6090 RCX: 00007fe78318f749 RDX: 0000000000004000 RSI: 0000000000000008 RDI: 0000000000000004 RBP: 00007fe783213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe7833e6128 R14: 00007fe7833e6090 R15: 00007ffc3dac7bf8