====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.6.3915/21104 is trying to acquire lock: ffff88805324a258 (mapping.invalidate_lock#6){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline] ffff88805324a258 (mapping.invalidate_lock#6){++++}-{4:4}, at: filemap_fault+0x5c3/0x1290 mm/filemap.c:3537 but task is already holding lock: ffff888032129bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:410 [inline] ffff888032129bc0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:390 [inline] ffff888032129bc0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300 mm/mmap_lock.c:450 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xcc/0x130 mm/memory.c:7174 _inline_copy_to_user include/linux/uaccess.h:201 [inline] _copy_to_user+0x2c/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:236 [inline] fiemap_fill_next_extent+0x1c0/0x390 fs/ioctl.c:144 ni_fiemap+0x7e5/0xbf0 fs/ntfs3/frecord.c:1987 ntfs_fiemap+0x11d/0x1a0 fs/ntfs3/file.c:1419 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1173/0x1430 fs/ioctl.c:531 __do_sys_ioctl fs/ioctl.c:595 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&ni->ni_lock/5){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:776 ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline] ntfs_fallocate+0x7c4/0x10b0 fs/ntfs3/file.c:689 vfs_fallocate+0x669/0x7e0 fs/open.c:339 ksys_fallocate fs/open.c:363 [inline] __do_sys_fallocate fs/open.c:368 [inline] __se_sys_fallocate fs/open.c:366 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:366 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (mapping.invalidate_lock#6){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868 down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537 filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline] filemap_fault+0x5c3/0x1290 mm/filemap.c:3537 __do_fault+0x138/0x390 mm/memory.c:5320 do_read_fault mm/memory.c:5755 [inline] do_fault mm/memory.c:5889 [inline] do_pte_missing+0x2206/0x3330 mm/memory.c:4401 handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:185 [inline] _copy_from_user+0x75/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:223 [inline] snd_ctl_elem_add_user sound/core/control.c:1749 [inline] snd_ctl_ioctl+0x359/0x1c10 sound/core/control.c:1930 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: mapping.invalidate_lock#6 --> &ni->ni_lock/5 --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&mm->mmap_lock); lock(&ni->ni_lock/5); lock(&mm->mmap_lock); rlock(mapping.invalidate_lock#6); *** DEADLOCK *** 1 lock held by syz.6.3915/21104: #0: ffff888032129bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:410 [inline] #0: ffff888032129bc0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:390 [inline] #0: ffff888032129bc0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300 mm/mmap_lock.c:450 stack backtrace: CPU: 1 UID: 0 PID: 21104 Comm: syz.6.3915 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868 down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537 filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline] filemap_fault+0x5c3/0x1290 mm/filemap.c:3537 __do_fault+0x138/0x390 mm/memory.c:5320 do_read_fault mm/memory.c:5755 [inline] do_fault mm/memory.c:5889 [inline] do_pte_missing+0x2206/0x3330 mm/memory.c:4401 handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] RIP: 0010:raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] RIP: 0010:_inline_copy_from_user include/linux/uaccess.h:185 [inline] RIP: 0010:_copy_from_user+0x75/0xb0 lib/usercopy.c:18 Code: fd eb 49 48 b8 00 f0 ff ff ff 7f 00 00 49 39 c7 4c 0f 47 f8 4c 89 f7 89 de e8 97 23 99 fd 0f 01 cb 4c 89 f7 48 89 d9 4c 89 fe a4 0f 1f 00 49 89 cf 0f 01 ca 31 ff 48 89 ce e8 86 05 33 fd 4d RSP: 0018:ffffc9000413f860 EFLAGS: 00050246 RAX: 00007ffffffff001 RBX: 0000000000000110 RCX: 0000000000000110 RDX: 0000000000000001 RSI: 0000200000000340 RDI: ffffc9000413fa90 RBP: ffffc9000413fea8 R08: ffffc9000413fb9f R09: 1ffff92000827f73 R10: dffffc0000000000 R11: fffff52000827f74 R12: 00000000c1105517 R13: ffff88807ed5e810 R14: ffffc9000413fa90 R15: 0000200000000340 copy_from_user include/linux/uaccess.h:223 [inline] snd_ctl_elem_add_user sound/core/control.c:1749 [inline] snd_ctl_ioctl+0x359/0x1c10 sound/core/control.c:1930 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9865f8f749 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:00007f9866dee038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f98661e6270 RCX: 00007f9865f8f749 RDX: 0000200000000340 RSI: 00000000c1105517 RDI: 0000000000000003 RBP: 00007f9866013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f98661e6308 R14: 00007f98661e6270 R15: 00007ffc4b6cde88 ---------------- Code disassembly (best guess): 0: fd std 1: eb 49 jmp 0x4c 3: 48 b8 00 f0 ff ff ff movabs $0x7ffffffff000,%rax a: 7f 00 00 d: 49 39 c7 cmp %rax,%r15 10: 4c 0f 47 f8 cmova %rax,%r15 14: 4c 89 f7 mov %r14,%rdi 17: 89 de mov %ebx,%esi 19: e8 97 23 99 fd call 0xfd9923b5 1e: 0f 01 cb stac 21: 4c 89 f7 mov %r14,%rdi 24: 48 89 d9 mov %rbx,%rcx 27: 4c 89 fe mov %r15,%rsi * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 49 89 cf mov %rcx,%r15 32: 0f 01 ca clac 35: 31 ff xor %edi,%edi 37: 48 89 ce mov %rcx,%rsi 3a: e8 86 05 33 fd call 0xfd3305c5 3f: 4d rex.WRB