====================================================== WARNING: possible circular locking dependency detected 6.1.136-syzkaller #0 Not tainted ------------------------------------------------------ syz.9.2136/12500 is trying to acquire lock: ffff888059016a20 (&ocfs2_file_ip_alloc_sem_key/1){+.+.}-{3:3}, at: ocfs2_remap_file_range+0x3f3/0x720 fs/ocfs2/file.c:2695 but task is already holding lock: ffff888054a4bf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_remap_file_range+0x3d7/0x720 fs/ocfs2/file.c:2693 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ocfs2_read_virt_blocks+0x265/0x950 fs/ocfs2/extent_map.c:976 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x3d1/0x20c0 fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0x102/0x390 fs/ocfs2/dir.c:1995 ocfs2_lookup_ino_from_name+0x4f/0xf0 fs/ocfs2/dir.c:2017 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x332/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x316/0x650 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2250 [inline] ocfs2_fill_super+0x2a32/0x4d00 fs/ocfs2/super.c:994 mount_bdev+0x287/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3057 do_mount fs/namespace.c:3400 [inline] __do_sys_mount fs/namespace.c:3608 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3585 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&osb->system_file_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 ocfs2_get_system_file_inode+0x1a2/0x7b0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x135/0x4630 fs/ocfs2/suballoc.c:776 ocfs2_reserve_new_metadata_blocks+0x400/0x940 fs/ocfs2/suballoc.c:978 ocfs2_create_refcount_tree+0x290/0x12c0 fs/ocfs2/refcounttree.c:571 ocfs2_reflink_remap_blocks+0x2e7/0x1930 fs/ocfs2/refcounttree.c:4655 ocfs2_remap_file_range+0x4aa/0x720 fs/ocfs2/file.c:2703 vfs_copy_file_range+0xd95/0x1560 fs/read_write.c:1518 __do_sys_copy_file_range fs/read_write.c:1596 [inline] __se_sys_copy_file_range+0x31d/0x480 fs/read_write.c:1559 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ocfs2_file_ip_alloc_sem_key/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 down_write_nested+0x39/0x60 kernel/locking/rwsem.c:1689 ocfs2_remap_file_range+0x3f3/0x720 fs/ocfs2/file.c:2695 vfs_copy_file_range+0xd95/0x1560 fs/read_write.c:1518 __do_sys_copy_file_range fs/read_write.c:1596 [inline] __se_sys_copy_file_range+0x31d/0x480 fs/read_write.c:1559 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &ocfs2_file_ip_alloc_sem_key/1 --> &osb->system_file_mutex --> &ocfs2_file_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_file_ip_alloc_sem_key); lock(&osb->system_file_mutex); lock(&ocfs2_file_ip_alloc_sem_key); lock(&ocfs2_file_ip_alloc_sem_key/1); *** DEADLOCK *** 4 locks held by syz.9.2136/12500: #0: ffff888075a22460 (sb_writers#32){.+.+}-{0:0}, at: vfs_copy_file_range+0x8d3/0x1560 fs/read_write.c:1502 #1: ffff888054a4c2c8 (&sb->s_type->i_mutex_key#40){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888054a4c2c8 (&sb->s_type->i_mutex_key#40){+.+.}-{3:3}, at: lock_two_nondirectories+0xd5/0x150 fs/inode.c:1208 #2: ffff888059016d88 (&sb->s_type->i_mutex_key#40/4){+.+.}-{3:3}, at: ocfs2_reflink_inodes_lock+0x128/0xc90 fs/ocfs2/refcounttree.c:4723 #3: ffff888054a4bf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_remap_file_range+0x3d7/0x720 fs/ocfs2/file.c:2693 stack backtrace: CPU: 1 PID: 12500 Comm: syz.9.2136 Not tainted 6.1.136-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 down_write_nested+0x39/0x60 kernel/locking/rwsem.c:1689 ocfs2_remap_file_range+0x3f3/0x720 fs/ocfs2/file.c:2695 vfs_copy_file_range+0xd95/0x1560 fs/read_write.c:1518 __do_sys_copy_file_range fs/read_write.c:1596 [inline] __se_sys_copy_file_range+0x31d/0x480 fs/read_write.c:1559 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fac9118e969 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:00007fac91fc7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146 RAX: ffffffffffffffda RBX: 00007fac913b5fa0 RCX: 00007fac9118e969 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007fac91210ab1 R08: ffffffffa003e459 R09: 0700000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fac913b5fa0 R15: 00007ffec550e8d8