====================================================== WARNING: possible circular locking dependency detected 5.15.169-syzkaller #0 Not tainted ------------------------------------------------------ syz.1.415/5649 is trying to acquire lock: ffff88801a3da428 (&mm->mmap_lock){++++}-{3:3} , at: mmap_read_lock+0x1c/0x50 include/linux/mmap_lock.h:117 but task is already holding lock: ffff888060f08b00 (&sb->s_type->i_mutex_key#31 ){+.+.}-{3:3} , at: inode_trylock include/linux/fs.h:809 [inline] , at: ntfs_file_write_iter+0x1ca/0x540 fs/ntfs3/file.c:1122 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#31){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:789 [inline] ntfs_file_mmap+0x589/0x7e0 fs/ntfs3/file.c:401 call_mmap include/linux/fs.h:2179 [inline] mmap_region+0x10e7/0x1670 mm/mmap.c:1791 do_mmap+0x78d/0xe00 mm/mmap.c:1575 vm_mmap_pgoff+0x1ca/0x2d0 mm/util.c:551 ksys_mmap_pgoff+0x559/0x780 mm/mmap.c:1624 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 mmap_read_lock+0x1c/0x50 include/linux/mmap_lock.h:117 do_user_addr_fault arch/x86/mm/fault.c:1308 [inline] handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x596/0x700 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 __get_user_nocheck_1+0x6/0x10 arch/x86/lib/getuser.S:103 fault_in_readable+0xce/0x2e0 mm/gup.c:1793 fault_in_iov_iter_readable+0x14a/0x1d0 lib/iov_iter.c:460 generic_perform_write+0x41e/0x5b0 mm/filemap.c:3775 __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3912 ntfs_file_write_iter+0x48b/0x540 fs/ntfs3/file.c:1143 call_write_iter include/linux/fs.h:2174 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacd/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#31); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#31); lock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.1.415/5649: #0: ffff88807aaf20f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2cb/0x380 fs/file.c:1057 #1: ffff88805aa04460 (sb_writers#24){.+.+}-{0:0}, at: vfs_write+0x29a/0xe50 fs/read_write.c:590 #2: ffff888060f08b00 (&sb->s_type->i_mutex_key#31){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:809 [inline] #2: ffff888060f08b00 (&sb->s_type->i_mutex_key#31){+.+.}-{3:3}, at: ntfs_file_write_iter+0x1ca/0x540 fs/ntfs3/file.c:1122 stack backtrace: CPU: 0 PID: 5649 Comm: syz.1.415 Not tainted 5.15.169-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 mmap_read_lock+0x1c/0x50 include/linux/mmap_lock.h:117 do_user_addr_fault arch/x86/mm/fault.c:1308 [inline] handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x596/0x700 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0010:__get_user_nocheck_1+0x6/0x10 arch/x86/lib/getuser.S:124 Code: d0 73 64 48 19 d2 48 21 d0 0f 01 cb 48 8b 10 31 c0 0f 01 ca c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 0f 01 cb 0f ae e8 <0f> b6 10 31 c0 0f 01 ca c3 90 0f 01 cb 0f ae e8 0f b7 10 31 c0 0f RSP: 0018:ffffc90002577978 EFLAGS: 00050202 RAX: 0000000020000640 RBX: 0000000020000640 RCX: ffff8880278f1dc0 RDX: ffffc900055c1000 RSI: 0000000000000640 RDI: 0000000000000000 RBP: ffffc90002577a38 R08: ffffffff81b74353 R09: fffff9400029e117 R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000000b R13: ffffc900025779c0 R14: dffffc0000000000 R15: 0000000020000640 fault_in_readable+0xce/0x2e0 mm/gup.c:1793 fault_in_iov_iter_readable+0x14a/0x1d0 lib/iov_iter.c:460 generic_perform_write+0x41e/0x5b0 mm/filemap.c:3775 __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3912 ntfs_file_write_iter+0x48b/0x540 fs/ntfs3/file.c:1143 call_write_iter include/linux/fs.h:2174 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacd/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fef10d56ff9 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:00007fef0f1cf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fef10f0ef80 RCX: 00007fef10d56ff9 RDX: 000000000000000b RSI: 0000000020000640 RDI: 0000000000000005 RBP: 00007fef10dc9296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fef10f0ef80 R15: 00007ffc90df96d8 ---------------- Code disassembly (best guess): 0: d0 73 64 shlb 0x64(%rbx) 3: 48 19 d2 sbb %rdx,%rdx 6: 48 21 d0 and %rdx,%rax 9: 0f 01 cb stac c: 48 8b 10 mov (%rax),%rdx f: 31 c0 xor %eax,%eax 11: 0f 01 ca clac 14: c3 ret 15: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 1c: 00 00 00 1f: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 24: 0f 01 cb stac 27: 0f ae e8 lfence * 2a: 0f b6 10 movzbl (%rax),%edx <-- trapping instruction 2d: 31 c0 xor %eax,%eax 2f: 0f 01 ca clac 32: c3 ret 33: 90 nop 34: 0f 01 cb stac 37: 0f ae e8 lfence 3a: 0f b7 10 movzwl (%rax),%edx 3d: 31 c0 xor %eax,%eax 3f: 0f .byte 0xf