loop9: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.9.5815/28423 is trying to acquire lock: ffff88807ab90270 (&wnd->rw_lock){++++}-{3:3}, at: mark_as_free_ex+0x3e/0x380 fs/ntfs3/fsntfs.c:2491 but task is already holding lock: ffff8880422bc410 (&ni->file.run_lock#2){++++}-{3:3}, at: attr_collapse_range+0x3b1/0x17f0 fs/ntfs3/attrib.c:1916 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+0x7fb/0xb80 fs/ntfs3/run.c:1126 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x2475/0x38a0 fs/ntfs3/inode.c:535 dir_search_u+0x1fe/0x2e0 fs/ntfs3/dir.c:264 ntfs_lookup+0xfb/0x1f0 fs/ntfs3/namei.c:85 lookup_one_qstr_excl+0x112/0x250 fs/namei.c:1617 filename_create+0x23e/0x480 fs/namei.c:3891 do_mknodat+0x18b/0x500 fs/namei.c:4036 __do_sys_mknodat fs/namei.c:4077 [inline] __se_sys_mknodat fs/namei.c:4074 [inline] __x64_sys_mknodat+0xa9/0xc0 fs/namei.c:4074 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 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+0x2df1/0x7d40 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689 mark_as_free_ex+0x3e/0x380 fs/ntfs3/fsntfs.c:2491 run_deallocate_ex+0x19b/0x310 fs/ntfs3/attrib.c:122 attr_collapse_range+0xcac/0x17f0 fs/ntfs3/attrib.c:1984 ntfs_fallocate+0x7bb/0x1040 fs/ntfs3/file.c:558 vfs_fallocate+0x58e/0x700 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc1/0x110 fs/open.c:353 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 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 *** 5 locks held by syz.9.5815/28423: #0: ffff88807ab94418 (sb_writers#34){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2711 [inline] #0: ffff88807ab94418 (sb_writers#34){.+.+}-{0:0}, at: vfs_fallocate+0x4fb/0x700 fs/open.c:323 #1: ffff8880422bc610 (&sb->s_type->i_mutex_key#37){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff8880422bc610 (&sb->s_type->i_mutex_key#37){+.+.}-{3:3}, at: ntfs_fallocate+0x2fb/0x1040 fs/ntfs3/file.c:473 #2: ffff8880422bc7a0 (mapping.invalidate_lock#10){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline] #2: ffff8880422bc7a0 (mapping.invalidate_lock#10){++++}-{3:3}, at: ntfs_fallocate+0x3bf/0x1040 fs/ntfs3/file.c:487 #3: ffff8880422bc360 (&ni->ni_lock#2/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1120 [inline] #3: ffff8880422bc360 (&ni->ni_lock#2/5){+.+.}-{3:3}, at: ntfs_fallocate+0x7a7/0x1040 fs/ntfs3/file.c:557 #4: ffff8880422bc410 (&ni->file.run_lock#2){++++}-{3:3}, at: attr_collapse_range+0x3b1/0x17f0 fs/ntfs3/attrib.c:1916 stack backtrace: CPU: 1 PID: 28423 Comm: syz.9.5815 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 check_noncircular+0x2fc/0x400 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+0x2df1/0x7d40 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689 mark_as_free_ex+0x3e/0x380 fs/ntfs3/fsntfs.c:2491 run_deallocate_ex+0x19b/0x310 fs/ntfs3/attrib.c:122 attr_collapse_range+0xcac/0x17f0 fs/ntfs3/attrib.c:1984 ntfs_fallocate+0x7bb/0x1040 fs/ntfs3/file.c:558 vfs_fallocate+0x58e/0x700 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc1/0x110 fs/open.c:353 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5be7f9acb9 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:00007f5be8de9028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f5be8215fa0 RCX: 00007f5be7f9acb9 RDX: 0000000000002000 RSI: 0000000000000008 RDI: 0000000000000004 RBP: 00007f5be8008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5be8216038 R14: 00007f5be8215fa0 R15: 00007ffd5aac70d8