====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.0.561/9131 is trying to acquire lock: ffff8880743c4bc8 (mapping.invalidate_lock#4){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] ffff8880743c4bc8 (mapping.invalidate_lock#4){++++}-{4:4}, at: do_page_cache_ra mm/readahead.c:347 [inline] ffff8880743c4bc8 (mapping.invalidate_lock#4){++++}-{4:4}, at: page_cache_ra_order+0xb37/0xee0 mm/readahead.c:558 but task is already holding lock: ffff8880743c71f8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline] ffff8880743c71f8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x70e/0xf60 fs/ntfs3/dir.c:541 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->ni_lock/5){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821 ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline] ntfs_fallocate+0x88b/0x1080 fs/ntfs3/file.c:599 vfs_fallocate+0x65a/0x7e0 fs/open.c:338 ksys_fallocate fs/open.c:362 [inline] __do_sys_fallocate fs/open.c:367 [inline] __se_sys_fallocate fs/open.c:365 [inline] __x64_sys_fallocate+0xbf/0x110 fs/open.c:365 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (mapping.invalidate_lock#4){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3181 [inline] check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x15ff/0x2e50 kernel/locking/lockdep.c:5254 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908 down_read+0x4a/0x330 kernel/locking/rwsem.c:1574 filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] do_page_cache_ra mm/readahead.c:347 [inline] page_cache_ra_order+0xb37/0xee0 mm/readahead.c:558 do_sync_mmap_readahead+0x75e/0x990 mm/filemap.c:3443 filemap_fault+0x7d9/0x13b0 mm/filemap.c:3597 __do_fault+0x138/0x2a0 mm/memory.c:5565 do_shared_fault mm/memory.c:6064 [inline] do_fault mm/memory.c:6138 [inline] do_pte_missing+0x684/0x34b0 mm/memory.c:4700 handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault mm/memory.c:6707 [inline] handle_mm_fault+0x1a53/0x3750 mm/memory.c:6876 do_user_addr_fault+0x746/0x1340 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 filldir+0x2bd/0x630 fs/readdir.c:-1 dir_emit include/linux/fs.h:3607 [inline] ntfs_dir_emit fs/ntfs3/dir.c:388 [inline] ntfs_read_hdr+0x8a7/0xc10 fs/ntfs3/dir.c:429 ntfs_readdir+0x78e/0xf60 fs/ntfs3/dir.c:555 iterate_dir+0x2e2/0x4d0 fs/readdir.c:110 __do_sys_getdents fs/readdir.c:319 [inline] __se_sys_getdents+0xf1/0x270 fs/readdir.c:304 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ni->ni_lock/5); lock(mapping.invalidate_lock#4); lock(&ni->ni_lock/5); rlock(mapping.invalidate_lock#4); *** DEADLOCK *** locks held by syz.0.561/9131: 3, last CPU#0: #0: ffff88807eb029b0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320 fs/file.c:1259 #1: ffff8880743c7490 (&type->i_mutex_dir_key#10){++++}-{4:4}, at: iterate_dir+0x209/0x4d0 fs/readdir.c:103 #2: ffff8880743c71f8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1247 [inline] #2: ffff8880743c71f8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x70e/0xf60 fs/ntfs3/dir.c:541 stack backtrace: CPU: 0 UID: 0 PID: 9131 Comm: syz.0.561 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2059 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2191 check_prev_add kernel/locking/lockdep.c:3181 [inline] check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x15ff/0x2e50 kernel/locking/lockdep.c:5254 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908 down_read+0x4a/0x330 kernel/locking/rwsem.c:1574 filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] do_page_cache_ra mm/readahead.c:347 [inline] page_cache_ra_order+0xb37/0xee0 mm/readahead.c:558 do_sync_mmap_readahead+0x75e/0x990 mm/filemap.c:3443 filemap_fault+0x7d9/0x13b0 mm/filemap.c:3597 __do_fault+0x138/0x2a0 mm/memory.c:5565 do_shared_fault mm/memory.c:6064 [inline] do_fault mm/memory.c:6138 [inline] do_pte_missing+0x684/0x34b0 mm/memory.c:4700 handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault mm/memory.c:6707 [inline] handle_mm_fault+0x1a53/0x3750 mm/memory.c:6876 do_user_addr_fault+0x746/0x1340 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0010:filldir+0x2bd/0x630 fs/readdir.c:290 Code: 99 8f 76 ff 0f 01 cb 48 8b 44 24 20 49 89 47 08 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 40 48 89 03 8b 4c 24 04 48 8d 43 10 <66> 89 08 8b 54 24 14 80 e2 0f 89 c9 48 8d 04 0b 48 ff c8 88 10 48 RSP: 0018:ffffc9000568fab0 EFLAGS: 00050297 RAX: 0000200000002000 RBX: 0000200000001ff0 RCX: 0000000000000020 RDX: 0000000000000002 RSI: 0000000000000005 RDI: 0000000000000007 RBP: dffffc0000000000 R08: ffff88802edc8007 R09: 1ffff11005db9000 R10: dffffc0000000000 R11: ffffed1005db9001 R12: ffff88807b8d0000 R13: 0000000000000005 R14: 0000000000000005 R15: 0000200000001fd8 dir_emit include/linux/fs.h:3607 [inline] ntfs_dir_emit fs/ntfs3/dir.c:388 [inline] ntfs_read_hdr+0x8a7/0xc10 fs/ntfs3/dir.c:429 ntfs_readdir+0x78e/0xf60 fs/ntfs3/dir.c:555 iterate_dir+0x2e2/0x4d0 fs/readdir.c:110 __do_sys_getdents fs/readdir.c:319 [inline] __se_sys_getdents+0xf1/0x270 fs/readdir.c:304 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f595219e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f59503f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007f5952426090 RCX: 00007f595219e0d9 RDX: 0000000020002078 RSI: 0000200000001fc0 RDI: 0000000000000008 RBP: 00007f5952235024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5952426128 R14: 00007f5952426090 R15: 00007ffede8ee588 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 76 ff jbe 0x1 2: 0f 01 cb stac 5: 48 8b 44 24 20 mov 0x20(%rsp),%rax a: 49 89 47 08 mov %rax,0x8(%r15) e: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp 15: fc ff df 18: 48 8b 44 24 40 mov 0x40(%rsp),%rax 1d: 48 89 03 mov %rax,(%rbx) 20: 8b 4c 24 04 mov 0x4(%rsp),%ecx 24: 48 8d 43 10 lea 0x10(%rbx),%rax * 28: 66 89 08 mov %cx,(%rax) <-- trapping instruction 2b: 8b 54 24 14 mov 0x14(%rsp),%edx 2f: 80 e2 0f and $0xf,%dl 32: 89 c9 mov %ecx,%ecx 34: 48 8d 04 0b lea (%rbx,%rcx,1),%rax 38: 48 ff c8 dec %rax 3b: 88 10 mov %dl,(%rax) 3d: 48 rex.W