====================================================== WARNING: possible circular locking dependency detected 5.15.181-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.386/5698 is trying to acquire lock: ffff0000de7a22e0 (&ocfs2_file_ip_alloc_sem_key/1){+.+.}-{3:3}, at: ocfs2_remap_file_range+0x35c/0x638 fs/ocfs2/file.c:2698 but task is already holding lock: ffff0000de7a14a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_remap_file_range+0x344/0x638 fs/ocfs2/file.c:2696 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+0xc0/0x390 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x228/0x858 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+0x314/0x1b84 fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0x10c/0x388 fs/ocfs2/dir.c:1995 ocfs2_lookup_ino_from_name+0x60/0x114 fs/ocfs2/dir.c:2017 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x288/0x5ec fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x2a8/0x594 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2276 [inline] ocfs2_fill_super+0x3128/0x4074 fs/ocfs2/super.c:995 mount_bdev+0x264/0x358 fs/super.c:1400 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1187 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x228/0x810 fs/namespace.c:3013 path_mount+0x5b4/0x1000 fs/namespace.c:3343 do_mount fs/namespace.c:3356 [inline] __do_sys_mount fs/namespace.c:3564 [inline] __se_sys_mount fs/namespace.c:3541 [inline] __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3541 __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 -> #1 (&osb->system_file_mutex){+.+.}-{3:3}: __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 ocfs2_get_system_file_inode+0x15c/0x5ec fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x11c/0x3a68 fs/ocfs2/suballoc.c:776 ocfs2_reserve_new_metadata_blocks+0x34c/0x7d8 fs/ocfs2/suballoc.c:978 ocfs2_create_refcount_tree+0x228/0x1024 fs/ocfs2/refcounttree.c:571 ocfs2_reflink_remap_blocks+0x290/0x14ac fs/ocfs2/refcounttree.c:4683 ocfs2_remap_file_range+0x3fc/0x638 fs/ocfs2/file.c:2706 vfs_copy_file_range+0xaa0/0x10ec fs/read_write.c:1510 __do_sys_copy_file_range fs/read_write.c:1588 [inline] __se_sys_copy_file_range fs/read_write.c:1551 [inline] __arm64_sys_copy_file_range+0x534/0x8c8 fs/read_write.c:1551 __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 (&ocfs2_file_ip_alloc_sem_key/1){+.+.}-{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_nested+0xc0/0x130 kernel/locking/rwsem.c:1667 ocfs2_remap_file_range+0x35c/0x638 fs/ocfs2/file.c:2698 vfs_copy_file_range+0xaa0/0x10ec fs/read_write.c:1510 __do_sys_copy_file_range fs/read_write.c:1588 [inline] __se_sys_copy_file_range fs/read_write.c:1551 [inline] __arm64_sys_copy_file_range+0x534/0x8c8 fs/read_write.c:1551 __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: 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.3.386/5698: #0: ffff0000e21de460 (sb_writers#17){.+.+}-{0:0}, at: vfs_copy_file_range+0x794/0x10ec fs/read_write.c:1494 #1: ffff0000de7a1808 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff0000de7a1808 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: lock_two_nondirectories+0xd0/0x128 fs/inode.c:1147 #2: ffff0000de7a2648 (&sb->s_type->i_mutex_key#26/4){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] #2: ffff0000de7a2648 (&sb->s_type->i_mutex_key#26/4){+.+.}-{3:3}, at: lock_two_nondirectories+0xb8/0x128 fs/inode.c:1149 #3: ffff0000de7a14a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_remap_file_range+0x344/0x638 fs/ocfs2/file.c:2696 stack backtrace: CPU: 1 PID: 5698 Comm: syz.3.386 Not tainted 5.15.181-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 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_nested+0xc0/0x130 kernel/locking/rwsem.c:1667 ocfs2_remap_file_range+0x35c/0x638 fs/ocfs2/file.c:2698 vfs_copy_file_range+0xaa0/0x10ec fs/read_write.c:1510 __do_sys_copy_file_range fs/read_write.c:1588 [inline] __se_sys_copy_file_range fs/read_write.c:1551 [inline] __arm64_sys_copy_file_range+0x534/0x8c8 fs/read_write.c:1551 __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