loop2: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected 6.1.115-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.69/4603 is trying to acquire lock: ffff888078ed4c58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x60 include/linux/mmap_lock.h:126 but task is already holding lock: ffff888059309260 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:778 [inline] ffff888059309260 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: ntfs_file_write_iter+0x1c7/0x6d0 fs/ntfs3/file.c:1144 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 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+0x583/0x7d0 fs/ntfs3/file.c:399 call_mmap include/linux/fs.h:2270 [inline] mmap_region+0xf96/0x1fa0 mm/mmap.c:2763 do_mmap+0x8c5/0xf60 mm/mmap.c:1425 vm_mmap_pgoff+0x1ca/0x2d0 mm/util.c:520 ksys_mmap_pgoff+0x4f5/0x6d0 mm/mmap.c:1471 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 down_read_killable+0xc6/0xd10 kernel/locking/rwsem.c:1543 mmap_read_lock_killable+0x1d/0x60 include/linux/mmap_lock.h:126 get_mmap_lock_carefully mm/memory.c:5331 [inline] lock_mm_and_find_vma+0x2a7/0x2e0 mm/memory.c:5382 do_user_addr_fault arch/x86/mm/fault.c:1312 [inline] handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x169/0x620 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 fault_in_readable+0x166/0x340 mm/gup.c:1890 fault_in_iov_iter_readable+0xdb/0x270 lib/iov_iter.c:356 generic_perform_write+0x454/0x5e0 mm/filemap.c:3835 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3973 ntfs_file_write_iter+0x5fa/0x6d0 fs/ntfs3/file.c:1165 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x857/0xbc0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 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(&sb->s_type->i_mutex_key#25); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#25); lock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.2.69/4603: #0: ffff88807c334ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ba/0x360 fs/file.c:1031 #1: ffff888055392460 (sb_writers#19){.+.+}-{0:0}, at: vfs_write+0x269/0xbc0 fs/read_write.c:580 #2: ffff888059309260 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:778 [inline] #2: ffff888059309260 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: ntfs_file_write_iter+0x1c7/0x6d0 fs/ntfs3/file.c:1144 stack backtrace: CPU: 1 PID: 4603 Comm: syz.2.69 Not tainted 6.1.115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 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+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 down_read_killable+0xc6/0xd10 kernel/locking/rwsem.c:1543 mmap_read_lock_killable+0x1d/0x60 include/linux/mmap_lock.h:126 get_mmap_lock_carefully mm/memory.c:5331 [inline] lock_mm_and_find_vma+0x2a7/0x2e0 mm/memory.c:5382 do_user_addr_fault arch/x86/mm/fault.c:1312 [inline] handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x169/0x620 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:fault_in_readable+0x166/0x340 mm/gup.c:1891 Code: 00 00 00 0f 01 cb 0f ae e8 49 81 e6 ff 0f 00 00 31 ff 4c 89 f6 e8 ba a8 bf ff 48 8b 4c 24 08 48 89 c8 48 25 ff 0f 00 00 74 30 <8a> 19 e8 c3 a4 bf ff 43 0f b6 04 2f 84 c0 0f 85 83 01 00 00 88 5c RSP: 0018:ffffc900053d79a0 EFLAGS: 00050206 RAX: 0000000000000100 RBX: 00007fffffffe000 RCX: 0000000020002100 RDX: ffffc90005bf2000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffffc900053d7a58 R08: ffffffff81caee76 R09: ffffffff843774a5 R10: 0000000000000002 R11: ffff88807b1c1dc0 R12: 0000000000001000 R13: dffffc0000000000 R14: 0000000000000100 R15: 1ffff92000a7af3c fault_in_iov_iter_readable+0xdb/0x270 lib/iov_iter.c:356 generic_perform_write+0x454/0x5e0 mm/filemap.c:3835 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3973 ntfs_file_write_iter+0x5fa/0x6d0 fs/ntfs3/file.c:1165 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x857/0xbc0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9361b7e719 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:00007f9362a51038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9361d35f80 RCX: 00007f9361b7e719 RDX: 000000000000fecc RSI: 0000000020000100 RDI: 0000000000000006 RBP: 00007f9361bf139e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9361d35f80 R15: 00007ffd55a26758 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 0f add %cl,(%rdi) 4: 01 cb add %ecx,%ebx 6: 0f ae e8 lfence 9: 49 81 e6 ff 0f 00 00 and $0xfff,%r14 10: 31 ff xor %edi,%edi 12: 4c 89 f6 mov %r14,%rsi 15: e8 ba a8 bf ff call 0xffbfa8d4 1a: 48 8b 4c 24 08 mov 0x8(%rsp),%rcx 1f: 48 89 c8 mov %rcx,%rax 22: 48 25 ff 0f 00 00 and $0xfff,%rax 28: 74 30 je 0x5a * 2a: 8a 19 mov (%rcx),%bl <-- trapping instruction 2c: e8 c3 a4 bf ff call 0xffbfa4f4 31: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax 36: 84 c0 test %al,%al 38: 0f 85 83 01 00 00 jne 0x1c1 3e: 88 .byte 0x88 3f: 5c pop %rsp