====================================================== WARNING: possible circular locking dependency detected 6.13.0-syzkaller-09793-g69b8923f5003 #0 Not tainted ------------------------------------------------------ syz.0.237/8329 is trying to acquire lock: ffff8880576b6360 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:199 but task is already holding lock: ffff888066a445b0 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:885 [inline] ffff888066a445b0 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: ntfs_file_write_iter+0x294/0x7e0 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#28){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:865 [inline] ntfs_file_mmap+0x5bc/0x850 fs/ntfs3/file.c:379 call_mmap include/linux/fs.h:2233 [inline] mmap_file mm/internal.h:124 [inline] __mmap_new_file_vma mm/vma.c:2292 [inline] __mmap_new_vma mm/vma.c:2356 [inline] __mmap_region mm/vma.c:2457 [inline] mmap_region+0x245e/0x2f80 mm/vma.c:2535 do_mmap+0xecc/0x13a0 mm/mmap.c:561 vm_mmap_pgoff+0x214/0x430 mm/util.c:575 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:607 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:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:199 get_mmap_lock_carefully mm/memory.c:6247 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6298 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+0x155/0x280 lib/iov_iter.c:108 ntfs_compress_write+0x110b/0x2170 fs/ntfs3/file.c:1095 ntfs_file_write_iter+0x697/0x7e0 fs/ntfs3/file.c:1266 do_iter_readv_writev+0x71a/0x9d0 vfs_writev+0x38b/0xbc0 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [inline] __do_sys_pwritev2 fs/read_write.c:1204 [inline] __se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195 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#28); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#28); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.0.237/8329: #0: ffff888070c3a420 (sb_writers#20){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3023 [inline] #0: ffff888070c3a420 (sb_writers#20){.+.+}-{0:0}, at: vfs_writev+0x2d6/0xbc0 fs/read_write.c:1048 #1: ffff888066a445b0 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:885 [inline] #1: ffff888066a445b0 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: ntfs_file_write_iter+0x294/0x7e0 fs/ntfs3/file.c:1240 stack backtrace: CPU: 0 UID: 0 PID: 8329 Comm: syz.0.237 Not tainted 6.13.0-syzkaller-09793-g69b8923f5003 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:199 get_mmap_lock_carefully mm/memory.c:6247 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6298 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:2234 Code: 8b 6c 24 18 4c 89 ee 48 81 e6 ff 0f 00 00 31 ff e8 b4 87 b7 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 82 b7 ff 43 0f b6 04 3e 84 c0 0f 85 61 01 00 00 RSP: 0018:ffffc90002fc77a0 EFLAGS: 00050206 RAX: 00000000000001c0 RBX: 00000000200011c1 RCX: ffff888026100000 RDX: 0000000000000000 RSI: 00000000000001c0 RDI: 0000000000000000 RBP: ffffc90002fc7858 R08: ffffffff8207d99c R09: ffffffff84de0159 R10: 0000000000000002 R11: ffff888026100000 R12: 0000000000000001 R13: 00000000200011c0 R14: 1ffff920005f8efc R15: dffffc0000000000 fault_in_iov_iter_readable+0x155/0x280 lib/iov_iter.c:108 ntfs_compress_write+0x110b/0x2170 fs/ntfs3/file.c:1095 ntfs_file_write_iter+0x697/0x7e0 fs/ntfs3/file.c:1266 do_iter_readv_writev+0x71a/0x9d0 vfs_writev+0x38b/0xbc0 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [inline] __do_sys_pwritev2 fs/read_write.c:1204 [inline] __se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195 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: 0033:0x7fdbe218cda9 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:00007fdbdffd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fdbe23a6160 RCX: 00007fdbe218cda9 RDX: 0000000000000002 RSI: 0000000020000500 RDI: 0000000000000005 RBP: 00007fdbe220e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000001000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fdbe23a6160 R15: 00007ffe108e2c18 ---------------- 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 87 b7 ff call 0xffb787c9 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 82 b7 ff call 0xffb782e9 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