ntfs3(loop7): failed to convert "0080" to cp437 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.7.1946/14166 is trying to acquire lock: ffff88813fe7d038 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601 but task is already holding lock: ffff88805b27e9f8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline] ffff88805b27e9f8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x749/0xec0 fs/ntfs3/dir.c:499 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:1222 [inline] attr_data_get_block+0x1bf/0x2a0 fs/ntfs3/attrib.c:976 ntfs_file_mmap_prepare+0x5b0/0xa20 fs/ntfs3/file.c:430 vfs_mmap_prepare include/linux/fs.h:2071 [inline] call_mmap_prepare mm/vma.c:2672 [inline] __mmap_region mm/vma.c:2758 [inline] mmap_region+0xe5a/0x2310 mm/vma.c:2860 do_mmap+0xc3b/0x10c0 mm/mmap.c:560 vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581 ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:606 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{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+0x1520/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_read_killable+0x50/0x3b0 kernel/locking/rwsem.c:1599 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601 get_mmap_lock_carefully mm/mmap_lock.c:450 [inline] lock_mm_and_find_vma+0x2d6/0x340 mm/mmap_lock.c:501 do_user_addr_fault+0x341/0x1340 arch/x86/mm/fault.c:1366 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:3582 [inline] ntfs_dir_emit fs/ntfs3/dir.c:346 [inline] ntfs_read_hdr+0x8a4/0xc10 fs/ntfs3/dir.c:387 ntfs_readdir+0x9e1/0xec0 fs/ntfs3/dir.c:547 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:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 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(&mm->mmap_lock); lock(&ni->ni_lock/5); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.7.1946/14166: #0: ffff88802535c470 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320 fs/file.c:1259 #1: ffff88805b27ec80 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: iterate_dir+0x209/0x4d0 fs/readdir.c:103 #2: ffff88805b27e9f8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline] #2: ffff88805b27e9f8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x749/0xec0 fs/ntfs3/dir.c:499 stack backtrace: CPU: 0 UID: 0 PID: 14166 Comm: syz.7.1946 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 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+0x1520/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_read_killable+0x50/0x3b0 kernel/locking/rwsem.c:1599 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601 get_mmap_lock_carefully mm/mmap_lock.c:450 [inline] lock_mm_and_find_vma+0x2d6/0x340 mm/mmap_lock.c:501 do_user_addr_fault+0x341/0x1340 arch/x86/mm/fault.c:1366 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 c8 79 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:ffffc90002dc7ab0 EFLAGS: 00050297 RAX: 0000200000002000 RBX: 0000200000001ff0 RCX: 0000000000000020 RDX: ffff88807f669f00 RSI: 0000000000000009 RDI: 0000000000000007 RBP: dffffc0000000000 R08: ffff88807f669f07 R09: 1ffff1100fecd3e0 R10: dffffc0000000000 R11: ffffed100fecd3e1 R12: ffff888079d8e000 R13: 0000000000000009 R14: 0000000000000009 R15: 0000200000001fd8 dir_emit include/linux/fs.h:3582 [inline] ntfs_dir_emit fs/ntfs3/dir.c:346 [inline] ntfs_read_hdr+0x8a4/0xc10 fs/ntfs3/dir.c:387 ntfs_readdir+0x9e1/0xec0 fs/ntfs3/dir.c:547 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:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f812d39ce59 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:00007f812e319028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007f812d615fa0 RCX: 00007f812d39ce59 RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000004 RBP: 00007f812d432e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f812d616038 R14: 00007f812d615fa0 R15: 00007fff083d3998 ---------------- Code disassembly (best guess): 0: 99 cltd 1: c8 79 ff 0f enter $0xff79,$0xf 5: 01 cb add %ecx,%ebx 7: 48 8b 44 24 20 mov 0x20(%rsp),%rax c: 49 89 47 08 mov %rax,0x8(%r15) 10: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp 17: fc ff df 1a: 48 8b 44 24 40 mov 0x40(%rsp),%rax 1f: 48 89 03 mov %rax,(%rbx) 22: 8b 4c 24 04 mov 0x4(%rsp),%ecx 26: 48 8d 43 10 lea 0x10(%rbx),%rax * 2a: 66 89 08 mov %cx,(%rax) <-- trapping instruction 2d: 8b 54 24 14 mov 0x14(%rsp),%edx 31: 80 e2 0f and $0xf,%dl 34: 89 c9 mov %ecx,%ecx 36: 48 8d 04 0b lea (%rbx,%rcx,1),%rax 3a: 48 ff c8 dec %rax 3d: 88 10 mov %dl,(%rax) 3f: 48 rex.W