====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc5-syzkaller-00018-g55027e689933 #0 Not tainted ------------------------------------------------------ syz-executor.3/8552 is trying to acquire lock: ffff888012a9cd98 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault mm/memory.c:6233 [inline] ffff888012a9cd98 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0xe3/0x190 mm/memory.c:6226 but task is already holding lock: ffff88804b4f68f0 (&ni->file.run_lock#3){++++}-{3:3}, at: ni_fiemap+0x5ef/0xc10 fs/ntfs3/frecord.c:1984 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->file.run_lock#3){++++}-{3:3}: down_read+0x9a/0x330 kernel/locking/rwsem.c:1526 attr_data_get_block+0x18b/0x1b70 fs/ntfs3/attrib.c:902 ntfs_file_mmap+0x59b/0x7d0 fs/ntfs3/file.c:294 call_mmap include/linux/fs.h:2107 [inline] mmap_region+0x757/0x2760 mm/mmap.c:2886 do_mmap+0xbc7/0xf60 mm/mmap.c:1397 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:573 ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1443 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #0 (&mm->mmap_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+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __might_fault mm/memory.c:6233 [inline] __might_fault+0x11b/0x190 mm/memory.c:6226 _copy_to_user+0x2b/0xc0 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:191 [inline] fiemap_fill_next_extent+0x205/0x350 fs/ioctl.c:145 ni_fiemap+0x444/0xc10 fs/ntfs3/frecord.c:2065 ntfs_fiemap+0xc9/0x120 fs/ntfs3/file.c:1215 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x404/0x1a90 fs/ioctl.c:841 __do_compat_sys_ioctl+0x149/0x330 fs/ioctl.c:1001 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&ni->file.run_lock#3); lock(&mm->mmap_lock); lock(&ni->file.run_lock#3); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz-executor.3/8552: #0: ffff88804b4f6840 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1123 [inline] #0: ffff88804b4f6840 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xb6/0x120 fs/ntfs3/file.c:1213 #1: ffff88804b4f68f0 (&ni->file.run_lock#3){++++}-{3:3}, at: ni_fiemap+0x5ef/0xc10 fs/ntfs3/frecord.c:1984 stack backtrace: CPU: 0 PID: 8552 Comm: syz-executor.3 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/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+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __might_fault mm/memory.c:6233 [inline] __might_fault+0x11b/0x190 mm/memory.c:6226 _copy_to_user+0x2b/0xc0 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:191 [inline] fiemap_fill_next_extent+0x205/0x350 fs/ioctl.c:145 ni_fiemap+0x444/0xc10 fs/ntfs3/frecord.c:2065 ntfs_fiemap+0xc9/0x120 fs/ntfs3/file.c:1215 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x404/0x1a90 fs/ioctl.c:841 __do_compat_sys_ioctl+0x149/0x330 fs/ioctl.c:1001 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf725c579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5e4e5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000c020660b RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi