====================================================== WARNING: possible circular locking dependency detected 6.1.107-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.1526/8154 is trying to acquire lock: ffff888078671058 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x60 include/linux/mmap_lock.h:126 but task is already holding lock: ffff88807630d4c0 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3} , at: inode_trylock include/linux/fs.h:778 [inline] , at: ntfs_file_write_iter+0x1c7/0x6d0 fs/ntfs3/file.c:1142 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:5314 [inline] lock_mm_and_find_vma+0x2a7/0x2e0 mm/memory.c:5365 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:570 fault_in_readable+0x1c8/0x340 fault_in_iov_iter_readable+0xdb/0x270 lib/iov_iter.c:356 generic_perform_write+0x207/0x5e0 mm/filemap.c:3807 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3945 ntfs_file_write_iter+0x5fa/0x6d0 fs/ntfs3/file.c:1163 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.2.1526/8154: #0: ffff88807b594ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ba/0x360 fs/file.c:1058 #1: ffff888045ee2460 (sb_writers#17){.+.+}-{0:0}, at: vfs_write+0x269/0xbc0 fs/read_write.c:580 #2: ffff88807630d4c0 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:778 [inline] #2: ffff88807630d4c0 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: ntfs_file_write_iter+0x1c7/0x6d0 fs/ntfs3/file.c:1142 stack backtrace: CPU: 0 PID: 8154 Comm: syz.2.1526 Not tainted 6.1.107-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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:5314 [inline] lock_mm_and_find_vma+0x2a7/0x2e0 mm/memory.c:5365 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:570 RIP: 0010:fault_in_readable+0x1c8/0x340 mm/gup.c:1898 Code: 24 08 4c 8d b0 ff 0f 00 00 48 89 c3 4d 01 e6 49 81 e6 00 f0 ff ff 49 39 c6 72 70 e8 52 a7 bf ff 4c 39 f3 74 73 4c 89 64 24 10 <44> 8a 23 43 0f b6 04 2f 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10 RSP: 0018:ffffc90003bb79a0 EFLAGS: 00050287 RAX: ffffffff81cb071e RBX: 0000000020090000 RCX: 0000000000040000 RDX: ffffc90005911000 RSI: 000000000002043d RDI: 000000000002043e RBP: ffffc90003bb7a58 R08: ffffffff81cb06b6 R09: ffffffff84370e55 R10: 0000000000000002 R11: ffff8880750a0000 R12: 0000000000001000 R13: dffffc0000000000 R14: 0000000020091000 R15: 1ffff92000776f3c fault_in_iov_iter_readable+0xdb/0x270 lib/iov_iter.c:356 generic_perform_write+0x207/0x5e0 mm/filemap.c:3807 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3945 ntfs_file_write_iter+0x5fa/0x6d0 fs/ntfs3/file.c:1163 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: 0033:0x7f75e4979eb9 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:00007f75e5745038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f75e4b15f80 RCX: 00007f75e4979eb9 RDX: 000000000208e24b RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f75e49e793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f75e4b15f80 R15: 00007fff46575e48 ---------------- Code disassembly (best guess): 0: 24 08 and $0x8,%al 2: 4c 8d b0 ff 0f 00 00 lea 0xfff(%rax),%r14 9: 48 89 c3 mov %rax,%rbx c: 4d 01 e6 add %r12,%r14 f: 49 81 e6 00 f0 ff ff and $0xfffffffffffff000,%r14 16: 49 39 c6 cmp %rax,%r14 19: 72 70 jb 0x8b 1b: e8 52 a7 bf ff call 0xffbfa772 20: 4c 39 f3 cmp %r14,%rbx 23: 74 73 je 0x98 25: 4c 89 64 24 10 mov %r12,0x10(%rsp) * 2a: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction 2d: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax 32: 84 c0 test %al,%al 34: 75 18 jne 0x4e 36: 44 88 64 24 40 mov %r12b,0x40(%rsp) 3b: 48 rex.W 3c: 81 .byte 0x81 3d: c3 ret 3e: 00 10 add %dl,(%rax)