====================================================== WARNING: possible circular locking dependency detected 6.11.0-rc7-syzkaller-00021-g7c6a3a65ace7 #0 Not tainted ------------------------------------------------------ syz.2.409/9297 is trying to acquire lock: ffff8880234b0198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 but task is already holding lock: ffff888059f78af0 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:820 [inline] ffff888059f78af0 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}, at: ntfs_file_write_iter+0x24a/0x740 fs/ntfs3/file.c:1166 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_write+0x99/0x220 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:800 [inline] ntfs_file_mmap+0x5bf/0x850 fs/ntfs3/file.c:368 call_mmap include/linux/fs.h:2130 [inline] mmap_region+0xe8f/0x2090 mm/mmap.c:2957 do_mmap+0x8f9/0x1010 mm/mmap.c:1468 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:1514 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){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1549 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 get_mmap_lock_carefully mm/memory.c:5878 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:5929 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/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0x165/0x2b0 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x29f/0x840 mm/filemap.c:4009 ntfs_file_write_iter+0x663/0x740 fs/ntfs3/file.c:1193 do_iter_readv_writev+0x60a/0x890 vfs_writev+0x37c/0xbb0 fs/read_write.c:971 do_pwritev fs/read_write.c:1072 [inline] __do_sys_pwritev2 fs/read_write.c:1131 [inline] __se_sys_pwritev2+0x1ca/0x2d0 fs/read_write.c:1122 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#33); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#33); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.2.409/9297: #0: ffff88805d3ce420 (sb_writers#25){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2882 [inline] #0: ffff88805d3ce420 (sb_writers#25){.+.+}-{0:0}, at: vfs_writev+0x2d4/0xbb0 fs/read_write.c:969 #1: ffff888059f78af0 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:820 [inline] #1: ffff888059f78af0 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}, at: ntfs_file_write_iter+0x24a/0x740 fs/ntfs3/file.c:1166 stack backtrace: CPU: 1 UID: 0 PID: 9297 Comm: syz.2.409 Not tainted 6.11.0-rc7-syzkaller-00021-g7c6a3a65ace7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186 check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1549 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 get_mmap_lock_carefully mm/memory.c:5878 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:5929 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/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x165/0x2b0 mm/gup.c:2244 Code: b7 ff 4c 8d b3 ff 0f 00 00 48 89 d8 4d 01 e6 49 81 e6 00 f0 ff ff 49 39 c6 72 6b e8 45 9a b7 ff 4c 39 f3 74 6e 4c 89 64 24 10 <44> 8a 23 43 0f b6 04 2f 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10 RSP: 0018:ffffc90013527840 EFLAGS: 00050287 RAX: ffffffff81dbf21b RBX: 0000000020002000 RCX: 0000000000040000 RDX: ffffc9001063b000 RSI: 000000000000ceec RDI: 000000000000ceed RBP: ffffc900135278f8 R08: ffffffff81dbf1b8 R09: ffffffff84a77f79 R10: 0000000000000002 R11: ffff888024478000 R12: 0000000000001000 R13: dffffc0000000000 R14: 0000000020003000 R15: 1ffff920026a4f10 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x29f/0x840 mm/filemap.c:4009 ntfs_file_write_iter+0x663/0x740 fs/ntfs3/file.c:1193 do_iter_readv_writev+0x60a/0x890 vfs_writev+0x37c/0xbb0 fs/read_write.c:971 do_pwritev fs/read_write.c:1072 [inline] __do_sys_pwritev2 fs/read_write.c:1131 [inline] __se_sys_pwritev2+0x1ca/0x2d0 fs/read_write.c:1122 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: 0033:0x7f0bfcb7def9 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:00007f0bfc9f8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f0bfcd35f80 RCX: 00007f0bfcb7def9 RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000005 RBP: 00007f0bfcbf0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0bfcd35f80 R15: 00007ffdb8b88758 ---------------- Code disassembly (best guess): 0: b7 ff mov $0xff,%bh 2: 4c 8d b3 ff 0f 00 00 lea 0xfff(%rbx),%r14 9: 48 89 d8 mov %rbx,%rax c: 4d 01 e6 add %r12,%r14 f: 49 81 e6 00 f0 ff ff and $0xfffffffffffff000,%r14 16: 49 39 c6 cmp %rax,%r14 19: 72 6b jb 0x86 1b: e8 45 9a b7 ff call 0xffb79a65 20: 4c 39 f3 cmp %r14,%rbx 23: 74 6e je 0x93 25: 4c 89 64 24 10 mov %r12,0x10(%rsp) * 2a: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction 2d: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax 32: 84 c0 test %al,%al 34: 75 18 jne 0x4e 36: 44 88 64 24 40 mov %r12b,0x40(%rsp) 3b: 48 rex.W 3c: 81 .byte 0x81 3d: c3 ret 3e: 00 10 add %dl,(%rax)