====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.1363/11914 is trying to acquire lock: ffff88805412d980 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] ffff88805412d980 (&ni->ni_lock/5){+.+.}-{3:3}, at: attr_data_get_block+0x31b/0x18d0 fs/ntfs3/attrib.c:849 but task is already holding lock: ffff88802c0f4728 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff88802c0f4728 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x16c/0x2d0 mm/util.c:549 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xb3/0x110 mm/memory.c:5357 _copy_to_user+0x29/0x130 lib/usercopy.c:35 copy_to_user include/linux/uaccess.h:200 [inline] fiemap_fill_next_extent+0x1ba/0x390 fs/ioctl.c:144 ni_fiemap+0x858/0xc50 fs/ntfs3/frecord.c:2023 ntfs_fiemap+0xd7/0x130 fs/ntfs3/file.c:1240 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x152d/0x1ef0 fs/ioctl.c:814 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&ni->file.run_lock){.+.+}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ni_fiemap+0x2e8/0xc50 fs/ntfs3/frecord.c:1940 ntfs_fiemap+0xd7/0x130 fs/ntfs3/file.c:1240 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x152d/0x1ef0 fs/ioctl.c:814 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&ni->ni_lock/5){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1e3/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] attr_data_get_block+0x31b/0x18d0 fs/ntfs3/attrib.c:849 ntfs_get_block_vbo+0x329/0xca0 fs/ntfs3/inode.c:593 __block_write_begin_int+0x565/0x15d0 fs/buffer.c:2012 __block_write_begin fs/buffer.c:2062 [inline] block_write_begin+0x4d/0xc0 fs/buffer.c:2122 ntfs_extend_initialized_size+0x38c/0x790 fs/ntfs3/file.c:159 ntfs_file_mmap+0x58c/0x770 fs/ntfs3/file.c:405 call_mmap include/linux/fs.h:2178 [inline] mmap_file+0x5d/0xb0 mm/util.c:1092 __mmap_region mm/mmap.c:1796 [inline] mmap_region+0xf88/0x1650 mm/mmap.c:2933 do_mmap+0x819/0xe90 mm/mmap.c:1586 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:551 ksys_mmap_pgoff+0x54b/0x790 mm/mmap.c:1635 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &ni->ni_lock/5 --> &ni->file.run_lock --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&ni->file.run_lock); lock(&mm->mmap_lock); lock(&ni->ni_lock/5); *** DEADLOCK *** 2 locks held by syz.2.1363/11914: #0: ffff88802c0f4728 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff88802c0f4728 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x16c/0x2d0 mm/util.c:549 #1: ffff88805412dc20 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:807 [inline] #1: ffff88805412dc20 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: ntfs_file_mmap+0x54c/0x770 fs/ntfs3/file.c:401 stack backtrace: CPU: 1 PID: 11914 Comm: syz.2.1363 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1e3/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] attr_data_get_block+0x31b/0x18d0 fs/ntfs3/attrib.c:849 ntfs_get_block_vbo+0x329/0xca0 fs/ntfs3/inode.c:593 __block_write_begin_int+0x565/0x15d0 fs/buffer.c:2012 __block_write_begin fs/buffer.c:2062 [inline] block_write_begin+0x4d/0xc0 fs/buffer.c:2122 ntfs_extend_initialized_size+0x38c/0x790 fs/ntfs3/file.c:159 ntfs_file_mmap+0x58c/0x770 fs/ntfs3/file.c:405 call_mmap include/linux/fs.h:2178 [inline] mmap_file+0x5d/0xb0 mm/util.c:1092 __mmap_region mm/mmap.c:1796 [inline] mmap_region+0xf88/0x1650 mm/mmap.c:2933 do_mmap+0x819/0xe90 mm/mmap.c:1586 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:551 ksys_mmap_pgoff+0x54b/0x790 mm/mmap.c:1635 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe14268e819 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:00007fe1408a6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fe142908180 RCX: 00007fe14268e819 RDX: 0000000001000003 RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007fe142724c91 R08: 0000000000000005 R09: 0000000013000000 R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe142908218 R14: 00007fe142908180 R15: 00007fff0af0a3a8