====================================================== WARNING: possible circular locking dependency detected 5.15.184-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.182/4773 is trying to acquire lock: ffff0000e8bd3ea0 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] ffff0000e8bd3ea0 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: ntfs_file_mmap+0x410/0x584 fs/ntfs3/file.c:401 but task is already holding lock: ffff0000d2997418 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff0000d2997418 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x138/0x284 mm/util.c:549 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc8/0x128 mm/memory.c:5357 fault_in_readable+0x70/0x354 mm/gup.c:1793 fault_in_iov_iter_readable+0x120/0x248 lib/iov_iter.c:460 ntfs_compress_write+0xc2c/0x155c fs/ntfs3/file.c:996 ntfs_file_write_iter+0x330/0x49c fs/ntfs3/file.c:1143 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_pwrite64 fs/read_write.c:701 [inline] __do_sys_pwrite64 fs/read_write.c:711 [inline] __se_sys_pwrite64 fs/read_write.c:708 [inline] __arm64_sys_pwrite64+0x170/0x200 fs/read_write.c:708 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #0 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 down_write+0xbc/0x12c kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:787 [inline] ntfs_file_mmap+0x410/0x584 fs/ntfs3/file.c:401 call_mmap include/linux/fs.h:2177 [inline] mmap_file+0x6c/0xc8 mm/util.c:1092 __mmap_region mm/mmap.c:1784 [inline] mmap_region+0xadc/0x1390 mm/mmap.c:2921 do_mmap+0x67c/0xdb4 mm/mmap.c:1574 vm_mmap_pgoff+0x184/0x284 mm/util.c:551 ksys_mmap_pgoff+0x410/0x620 mm/mmap.c:1623 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#20); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#20); *** DEADLOCK *** 1 lock held by syz.2.182/4773: #0: ffff0000d2997418 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff0000d2997418 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x138/0x284 mm/util.c:549 stack backtrace: CPU: 0 PID: 4773 Comm: syz.2.182 Not tainted 5.15.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 down_write+0xbc/0x12c kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:787 [inline] ntfs_file_mmap+0x410/0x584 fs/ntfs3/file.c:401 call_mmap include/linux/fs.h:2177 [inline] mmap_file+0x6c/0xc8 mm/util.c:1092 __mmap_region mm/mmap.c:1784 [inline] mmap_region+0xadc/0x1390 mm/mmap.c:2921 do_mmap+0x67c/0xdb4 mm/mmap.c:1574 vm_mmap_pgoff+0x184/0x284 mm/util.c:551 ksys_mmap_pgoff+0x410/0x620 mm/mmap.c:1623 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 ------------[ cut here ]------------ kernel BUG at fs/buffer.c:3017! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 4773 Comm: syz.2.182 Not tainted 5.15.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : submit_bh_wbc+0x560/0x5f8 fs/buffer.c:3017 lr : submit_bh_wbc+0x560/0x5f8 fs/buffer.c:3017 sp : ffff80001f9473b0 x29: ffff80001f9473e0 x28: ffff8000089d0538 x27: ffff8000089d0318 x26: 0000000000000000 x25: dfff800000000000 x24: 1fffe0001fc25f79 x23: 0000000000000000 x22: ffff0000fe12fbc8 x21: dfff800000000000 x20: 0000000000000000 x19: 0000000000000004 x18: 0000000000000000 x17: 0000000000000000 x16: ffff8000082d4b38 x15: 0000000000000005 x14: 00000000111a14d8 x13: 000000004516ed3f x12: 0000000000ff0100 x11: 0000000000000000 x10: 0000000000000000 x9 : ffff8000089d9634 x8 : ffff0000c6c351c0 x7 : 0000000000000000 x6 : ffff8000089d6d28 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000 x2 : ffff0000fe12fbc8 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: submit_bh_wbc+0x560/0x5f8 fs/buffer.c:3017 submit_bh fs/buffer.c:3062 [inline] ll_rw_block+0x1f0/0x35c fs/buffer.c:-1 __block_write_begin_int+0xad0/0x1588 fs/buffer.c:2042 __block_write_begin fs/buffer.c:2062 [inline] block_write_begin+0x60/0xdc fs/buffer.c:2122 ntfs_write_begin+0xc0/0x198 fs/ntfs3/inode.c:929 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608 ntfs_extend_initialized_size+0x2c0/0x5f0 fs/ntfs3/file.c:159 ntfs_file_mmap+0x434/0x584 fs/ntfs3/file.c:402 call_mmap include/linux/fs.h:2177 [inline] mmap_file+0x6c/0xc8 mm/util.c:1092 __mmap_region mm/mmap.c:1784 [inline] mmap_region+0xadc/0x1390 mm/mmap.c:2921 do_mmap+0x67c/0xdb4 mm/mmap.c:1574 vm_mmap_pgoff+0x184/0x284 mm/util.c:551 ksys_mmap_pgoff+0x410/0x620 mm/mmap.c:1623 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Code: 17ffff45 97ea7cb6 d4210000 97ea7cb4 (d4210000) ---[ end trace 2c1365c83a5838ce ]---