loop9: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected 6.1.137-syzkaller #0 Not tainted ------------------------------------------------------ syz.9.510/7075 is trying to acquire lock: ffff88804b907240 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff88804b907240 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: ntfs_file_mmap+0x4de/0x6a0 fs/ntfs3/file.c:320 but task is already holding lock: ffff88807da1ae58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff88807da1ae58 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x15d/0x2b0 mm/util.c:518 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_lock){++++}-{3:3}: down_read_killable+0x4c/0x340 kernel/locking/rwsem.c:1543 mmap_read_lock_killable+0x1d/0x60 include/linux/mmap_lock.h:126 get_mmap_lock_carefully mm/memory.c:5333 [inline] lock_mm_and_find_vma+0x2b1/0x2f0 mm/memory.c:5384 do_user_addr_fault+0x2db/0xb10 arch/x86/mm/fault.c:1312 handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 fault_in_readable+0x13e/0x1f0 mm/gup.c:1914 fault_in_iov_iter_readable+0xbb/0x2e0 lib/iov_iter.c:356 generic_perform_write+0x1d2/0x560 mm/filemap.c:3836 __generic_file_write_iter+0x172/0x430 mm/filemap.c:3974 ntfs_file_write_iter+0x618/0x6f0 fs/ntfs3/file.c:1081 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 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+0x191/0x220 fs/read_write.c:706 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ntfs_file_mmap+0x4de/0x6a0 fs/ntfs3/file.c:320 call_mmap include/linux/fs.h:2270 [inline] mmap_file+0x5d/0xb0 mm/util.c:1109 __mmap_region mm/mmap.c:2760 [inline] mmap_region+0xf78/0x1d30 mm/mmap.c:2904 do_mmap+0x894/0xf30 mm/mmap.c:1424 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1470 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 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(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#27); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#27); *** DEADLOCK *** 1 lock held by syz.9.510/7075: #0: ffff88807da1ae58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff88807da1ae58 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x15d/0x2b0 mm/util.c:518 stack backtrace: CPU: 1 PID: 7075 Comm: syz.9.510 Not tainted 6.1.137-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ntfs_file_mmap+0x4de/0x6a0 fs/ntfs3/file.c:320 call_mmap include/linux/fs.h:2270 [inline] mmap_file+0x5d/0xb0 mm/util.c:1109 __mmap_region mm/mmap.c:2760 [inline] mmap_region+0xf78/0x1d30 mm/mmap.c:2904 do_mmap+0x894/0xf30 mm/mmap.c:1424 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1470 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f78dd38e969 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:00007f78dd1ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f78dd5b5fa0 RCX: 00007f78dd38e969 RDX: 0000000000000002 RSI: 0000000000001000 RDI: 0000200000001000 RBP: 00007f78dd410ab1 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f78dd5b5fa0 R15: 00007fffd8544318