loop0: detected capacity change from 0 to 32768 JBD2: Ignoring recovery information on journal ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 5.15.189-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.472/6459 is trying to acquire lock: ffff88802211d098 (&new->rf_sem){+.+.}-{3:3}, at: __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:428 [inline] ffff88802211d098 (&new->rf_sem){+.+.}-{3:3}, at: ocfs2_lock_refcount_tree+0x1c0/0x980 fs/ocfs2/refcounttree.c:463 but task is already holding lock: ffff888057d714a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_inode_lock_for_extent_tree+0x72/0x190 fs/ocfs2/file.c:2211 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+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x23f/0x8a0 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+0x3d1/0x1f90 fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0xdb/0x2f0 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+0x319/0x760 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x316/0x650 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2279 [inline] ocfs2_fill_super+0x3dbf/0x4d80 fs/ocfs2/super.c:995 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3014 do_mount fs/namespace.c:3357 [inline] __do_sys_mount fs/namespace.c:3565 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3542 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&osb->system_file_mutex){+.+.}-{3:3}: __mutex_lock_common+0x1eb/0x2390 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 ocfs2_get_system_file_inode+0x1b5/0x760 fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x139/0x4350 fs/ocfs2/suballoc.c:776 ocfs2_reserve_new_metadata_blocks+0x400/0x940 fs/ocfs2/suballoc.c:978 ocfs2_add_refcount_flag+0x36e/0xd80 fs/ocfs2/refcounttree.c:3711 ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4591 [inline] ocfs2_reflink_remap_blocks+0xd2c/0x1930 fs/ocfs2/refcounttree.c:4718 ocfs2_remap_file_range+0x4aa/0x720 fs/ocfs2/file.c:2706 vfs_copy_file_range+0xce7/0x1470 fs/read_write.c:1510 __do_sys_copy_file_range fs/read_write.c:1588 [inline] __se_sys_copy_file_range+0x31d/0x480 fs/read_write.c:1551 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&new->rf_sem){+.+.}-{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+0x2c33/0x7c60 kernel/locking/lockdep.c:5012 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:428 [inline] ocfs2_lock_refcount_tree+0x1c0/0x980 fs/ocfs2/refcounttree.c:463 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3443 [inline] ocfs2_refcount_cow+0x56e/0xc50 fs/ocfs2/refcounttree.c:3504 ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2343 [inline] ocfs2_file_write_iter+0xdfd/0x1cf0 fs/ocfs2/file.c:2454 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x712/0xd00 fs/read_write.c:594 ksys_write+0x14d/0x250 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &new->rf_sem --> &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(&new->rf_sem); *** DEADLOCK *** 4 locks held by syz.0.472/6459: #0: ffff88807f086d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2bf/0x370 fs/file.c:1058 #1: ffff88801febc460 (sb_writers#28){.+.+}-{0:0}, at: vfs_write+0x28a/0xd00 fs/read_write.c:590 #2: ffff888057d71808 (&sb->s_type->i_mutex_key#35){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #2: ffff888057d71808 (&sb->s_type->i_mutex_key#35){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x401/0x1cf0 fs/ocfs2/file.c:2402 #3: ffff888057d714a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_inode_lock_for_extent_tree+0x72/0x190 fs/ocfs2/file.c:2211 stack backtrace: CPU: 0 PID: 6459 Comm: syz.0.472 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 check_noncircular+0x274/0x310 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+0x2c33/0x7c60 kernel/locking/lockdep.c:5012 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:428 [inline] ocfs2_lock_refcount_tree+0x1c0/0x980 fs/ocfs2/refcounttree.c:463 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3443 [inline] ocfs2_refcount_cow+0x56e/0xc50 fs/ocfs2/refcounttree.c:3504 ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2343 [inline] ocfs2_file_write_iter+0xdfd/0x1cf0 fs/ocfs2/file.c:2454 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x712/0xd00 fs/read_write.c:594 ksys_write+0x14d/0x250 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fa3dc685be9 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:00007fa3da8ed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa3dc8acfa0 RCX: 00007fa3dc685be9 RDX: 0000000000000020 RSI: 0000200000000000 RDI: 0000000000000006 RBP: 00007fa3dc708e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa3dc8ad038 R14: 00007fa3dc8acfa0 R15: 00007fff68a4fa08