====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc2-syzkaller-00390-g224e74511041 #0 Not tainted ------------------------------------------------------ syz.0.161/7522 is trying to acquire lock: ffff88807a32e360 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:199 but task is already holding lock: ffff888057978398 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:897 [inline] ffff888057978398 (&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:877 [inline] ntfs_file_mmap+0x5bc/0x850 fs/ntfs3/file.c:379 call_mmap include/linux/fs.h:2245 [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+0x247c/0x2fa0 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:1360 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x1bf/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0x173/0x2d0 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x260/0x990 mm/filemap.c:4179 ntfs_file_write_iter+0x6e9/0x7e0 fs/ntfs3/file.c:1267 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.0.161/7522: #0: ffff88802a6aa420 (sb_writers#15){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3035 [inline] #0: ffff88802a6aa420 (sb_writers#15){.+.+}-{0:0}, at: vfs_writev+0x2d6/0xbc0 fs/read_write.c:1048 #1: ffff888057978398 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:897 [inline] #1: ffff888057978398 (&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: 7522 Comm: syz.0.161 Not tainted 6.14.0-rc2-syzkaller-00390-g224e74511041 #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:1360 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x1bf/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x173/0x2d0 mm/gup.c:2241 Code: 00 fc ff df 4c 89 e8 4f 8d ac 25 ff 0f 00 00 49 81 e5 00 f0 ff ff 49 39 c5 72 7a e8 27 f6 b6 ff 4c 39 eb 74 7d 4c 89 64 24 08 <44> 8a 23 43 0f b6 04 3e 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10 RSP: 0018:ffffc9000221f840 EFLAGS: 00050287 RAX: ffffffff820ac1b9 RBX: 000040000005d000 RCX: 0000000000080000 RDX: ffffc90004bf2000 RSI: 0000000000013176 RDI: 0000000000013177 RBP: ffffc9000221f8f8 R08: ffffffff820ac14c R09: ffffffff84eabf29 R10: 0000000000000002 R11: ffff88807d808000 R12: 0000000000001000 R13: 000040000005e000 R14: 1ffff92000443f10 R15: dffffc0000000000 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x260/0x990 mm/filemap.c:4179 ntfs_file_write_iter+0x6e9/0x7e0 fs/ntfs3/file.c:1267 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: 0033:0x7fb99d78cde9 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:00007fb99e654038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fb99d9a5fa0 RCX: 00007fb99d78cde9 RDX: 0000000000000001 RSI: 0000400000000240 RDI: 0000000000000006 RBP: 00007fb99d80e2a0 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000002000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb99d9a5fa0 R15: 00007ffdd805e7a8 ntfs3(loop0): failed to convert "0080" to koi8-ru ntfs3(loop0): failed to convert name for inode 1e. ntfs3(loop0): ino=1f, mi_enum_attr ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 4c 89 e8 fisttps -0x18(%rcx,%rcx,4) 4: 4f 8d ac 25 ff 0f 00 lea 0xfff(%r13,%r12,1),%r13 b: 00 c: 49 81 e5 00 f0 ff ff and $0xfffffffffffff000,%r13 13: 49 39 c5 cmp %rax,%r13 16: 72 7a jb 0x92 18: e8 27 f6 b6 ff call 0xffb6f644 1d: 4c 39 eb cmp %r13,%rbx 20: 74 7d je 0x9f 22: 4c 89 64 24 08 mov %r12,0x8(%rsp) * 27: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction 2a: 43 0f b6 04 3e movzbl (%r14,%r15,1),%eax 2f: 84 c0 test %al,%al 31: 75 18 jne 0x4b 33: 44 88 64 24 40 mov %r12b,0x40(%rsp) 38: 48 rex.W 39: 81 .byte 0x81 3a: c3 ret 3b: 00 10 add %dl,(%rax)