====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0 Not tainted ------------------------------------------------------ syz.6.592/11939 is trying to acquire lock: ffff888070966d20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:199 but task is already holding lock: ffff88805a8b99a0 (&sb->s_type->i_mutex_key#38){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:897 [inline] ffff88805a8b99a0 (&sb->s_type->i_mutex_key#38){+.+.}-{4:4}, at: ntfs_file_write_iter+0x294/0x7f0 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#38){+.+.}-{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:2296 [inline] __mmap_new_vma mm/vma.c:2360 [inline] __mmap_region mm/vma.c:2461 [inline] mmap_region+0x247c/0x2fa0 mm/vma.c:2539 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:6265 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6316 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 ntfs_compress_write+0x110b/0x2170 fs/ntfs3/file.c:1095 ntfs_file_write_iter+0x697/0x7f0 fs/ntfs3/file.c:1266 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xacf/0xd10 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 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#38); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#38); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.6.592/11939: #0: ffff8880726bc638 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x254/0x320 fs/file.c:1192 #1: ffff8880233ea420 (sb_writers#30){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3035 [inline] #1: ffff8880233ea420 (sb_writers#30){.+.+}-{0:0}, at: vfs_write+0x225/0xd10 fs/read_write.c:675 #2: ffff88805a8b99a0 (&sb->s_type->i_mutex_key#38){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:897 [inline] #2: ffff88805a8b99a0 (&sb->s_type->i_mutex_key#38){+.+.}-{4:4}, at: ntfs_file_write_iter+0x294/0x7f0 fs/ntfs3/file.c:1240 stack backtrace: CPU: 0 UID: 0 PID: 11939 Comm: syz.6.592 Not tainted 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:6265 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6316 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 f3 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:ffffc9000b7ef980 EFLAGS: 00050287 RAX: ffffffff820aebb5 RBX: 0000400000025000 RCX: 0000000000080000 RDX: ffffc9000e5f0000 RSI: 000000000003abb7 RDI: 000000000003abb8 RBP: ffffc9000b7efa38 R08: ffffffff820aeb1c R09: ffffffff84eb1e99 R10: 0000000000000002 R11: ffff888031955a00 R12: 0000000000010000 R13: 0000400000031000 R14: 1ffff920016fdf38 R15: dffffc0000000000 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 ntfs_compress_write+0x110b/0x2170 fs/ntfs3/file.c:1095 ntfs_file_write_iter+0x697/0x7f0 fs/ntfs3/file.c:1266 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xacf/0xd10 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 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: 0033:0x7fac19f8d169 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:00007fac1ae3e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fac1a1a5fa0 RCX: 00007fac19f8d169 RDX: 0000000000032600 RSI: 0000400000000100 RDI: 0000000000000007 RBP: 00007fac1a00e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fac1a1a5fa0 R15: 00007fff8a3bea08 ---------------- 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 f3 b6 ff call 0xffb6f344 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)