ntfs3(loop8): Failed to initialize $Extend. ====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-10689-g7af08b57bcb9 #0 Not tainted ------------------------------------------------------ syz.8.48/6550 is trying to acquire lock: ffff888024880b60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 but task is already holding lock: ffff888056e219a0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:838 [inline] ffff888056e219a0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: ntfs_file_write_iter+0x291/0x7a0 fs/ntfs3/file.c:1240 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:818 [inline] ntfs_file_mmap+0x5bc/0x850 fs/ntfs3/file.c:379 call_mmap include/linux/fs.h:2183 [inline] mmap_file mm/internal.h:124 [inline] __mmap_new_file_vma mm/vma.c:2291 [inline] __mmap_new_vma mm/vma.c:2355 [inline] __mmap_region+0x2204/0x2cd0 mm/vma.c:2456 mmap_region+0x226/0x2c0 mm/mmap.c:1347 do_mmap+0x8f0/0x1000 mm/mmap.c:496 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:580 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 get_mmap_lock_carefully mm/memory.c:6158 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6209 do_user_addr_fault arch/x86/mm/fault.c:1361 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x1bf/0x8b0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0x111/0x2d0 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x259/0x6d0 mm/filemap.c:4045 ntfs_file_write_iter+0x69c/0x7a0 fs/ntfs3/file.c:1267 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:679 ksys_pwrite64 fs/read_write.c:786 [inline] __do_sys_pwrite64 fs/read_write.c:794 [inline] __se_sys_pwrite64 fs/read_write.c:791 [inline] __x64_sys_pwrite64+0x1ac/0x240 fs/read_write.c:791 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#32); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#32); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.8.48/6550: #0: ffff8880322c0420 (sb_writers#28){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline] #0: ffff8880322c0420 (sb_writers#28){.+.+}-{0:0}, at: vfs_write+0x225/0xd30 fs/read_write.c:675 #1: ffff888056e219a0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:838 [inline] #1: ffff888056e219a0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: ntfs_file_write_iter+0x291/0x7a0 fs/ntfs3/file.c:1240 stack backtrace: CPU: 0 UID: 0 PID: 6550 Comm: syz.8.48 Not tainted 6.12.0-syzkaller-10689-g7af08b57bcb9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 get_mmap_lock_carefully mm/memory.c:6158 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6209 do_user_addr_fault arch/x86/mm/fault.c:1361 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x1bf/0x8b0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x111/0x2d0 mm/gup.c:2228 Code: 8b 6c 24 18 4c 89 ee 48 81 e6 ff 0f 00 00 31 ff e8 b4 9e b5 ff 4c 89 e8 48 25 ff 0f 00 00 74 34 49 bf 00 00 00 00 00 fc ff df <41> 8a 5d 00 e8 b6 99 b5 ff 43 0f b6 04 3e 84 c0 0f 85 61 01 00 00 RSP: 0018:ffffc90003b1fa00 EFLAGS: 00050206 RAX: 0000000000000274 RBX: 000000002000ff2f RCX: ffff88802d1cbc00 RDX: 0000000000000000 RSI: 0000000000000274 RDI: 0000000000000000 RBP: ffffc90003b1fab8 R08: ffffffff81e047ac R09: ffffffff84b58299 R10: 0000000000000002 R11: ffff88802d1cbc00 R12: 0000000000000cbb R13: 000000002000f274 R14: 1ffff92000763f48 R15: dffffc0000000000 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x259/0x6d0 mm/filemap.c:4045 ntfs_file_write_iter+0x69c/0x7a0 fs/ntfs3/file.c:1267 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:679 ksys_pwrite64 fs/read_write.c:786 [inline] __do_sys_pwrite64 fs/read_write.c:794 [inline] __se_sys_pwrite64 fs/read_write.c:791 [inline] __x64_sys_pwrite64+0x1ac/0x240 fs/read_write.c:791 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5f22980809 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:00007f5f2370e058 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f5f22b45fa0 RCX: 00007f5f22980809 RDX: 000000000000fdef RSI: 0000000020000140 RDI: 0000000000000005 RBP: 00007f5f229f393e R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5f22b45fa0 R15: 00007ffd883a4388 ---------------- Code disassembly (best guess): 0: 8b 6c 24 18 mov 0x18(%rsp),%ebp 4: 4c 89 ee mov %r13,%rsi 7: 48 81 e6 ff 0f 00 00 and $0xfff,%rsi e: 31 ff xor %edi,%edi 10: e8 b4 9e b5 ff call 0xffb59ec9 15: 4c 89 e8 mov %r13,%rax 18: 48 25 ff 0f 00 00 and $0xfff,%rax 1e: 74 34 je 0x54 20: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 27: fc ff df * 2a: 41 8a 5d 00 mov 0x0(%r13),%bl <-- trapping instruction 2e: e8 b6 99 b5 ff call 0xffb599e9 33: 43 0f b6 04 3e movzbl (%r14,%r15,1),%eax 38: 84 c0 test %al,%al 3a: 0f 85 61 01 00 00 jne 0x1a1