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 syzkaller #0 Not tainted ------------------------------------------------------ syz.0.56/4477 is trying to acquire lock: ffff88807cef1488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x1a4/0x7f0 fs/ocfs2/sysfile.c:101 but task is already holding lock: ffff888068ebbf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x2c4/0xaa0 fs/ocfs2/mmap.c:141 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x240/0x8e0 fs/ocfs2/extent_map.c:984 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x39d/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+0x33f/0x7f0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x315/0x6e0 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2279 [inline] ocfs2_fill_super+0x4032/0x50c0 fs/ocfs2/super.c:995 mount_bdev+0x28a/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+0x247/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562 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 (&osb->system_file_mutex){+.+.}-{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+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1e5/0x2400 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+0x1a4/0x7f0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0xfb/0x2630 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1184 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1245 [inline] ocfs2_lock_allocators+0x2ce/0x5f0 fs/ocfs2/suballoc.c:2701 ocfs2_write_begin_nolock+0x1b97/0x44b0 fs/ocfs2/aops.c:1743 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:92 [inline] ocfs2_page_mkwrite+0x58a/0xaa0 fs/ocfs2/mmap.c:143 do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922 wp_page_shared+0x163/0x6c0 mm/memory.c:3259 handle_pte_fault mm/memory.c:4668 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x1fbd/0x4440 mm/memory.c:4883 do_user_addr_fault+0x494/0xc90 arch/x86/mm/fault.c:1355 handle_page_fault arch/x86/mm/fault.c:1443 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 other info that might help us debug this: 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(&osb->system_file_mutex); *** DEADLOCK *** 3 locks held by syz.0.56/4477: #0: ffff88807e146328 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff88807e146328 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296 #1: ffff88807a9ca558 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922 #2: ffff888068ebbf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x2c4/0xaa0 fs/ocfs2/mmap.c:141 stack backtrace: CPU: 0 PID: 4477 Comm: syz.0.56 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 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+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1e5/0x2400 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+0x1a4/0x7f0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0xfb/0x2630 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1184 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1245 [inline] ocfs2_lock_allocators+0x2ce/0x5f0 fs/ocfs2/suballoc.c:2701 ocfs2_write_begin_nolock+0x1b97/0x44b0 fs/ocfs2/aops.c:1743 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:92 [inline] ocfs2_page_mkwrite+0x58a/0xaa0 fs/ocfs2/mmap.c:143 do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922 wp_page_shared+0x163/0x6c0 mm/memory.c:3259 handle_pte_fault mm/memory.c:4668 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x1fbd/0x4440 mm/memory.c:4883 do_user_addr_fault+0x494/0xc90 arch/x86/mm/fault.c:1355 handle_page_fault arch/x86/mm/fault.c:1443 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0033:0x7fdebba15d2b Code: fa 10 73 2d 83 fa 08 73 46 83 fa 04 73 16 83 fa 01 7c 10 8a 0e 74 0a 0f b7 74 16 fe 66 89 74 17 fe 88 0f c3 8b 4c 16 fc 8b 36 <89> 4c 17 fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 RSP: 002b:00007ffe31f8ed98 EFLAGS: 00010202 RAX: 0000200000000200 RBX: 0000000000000004 RCX: 0000000000737562 RDX: 0000000000000006 RSI: 0000000075622f2e RDI: 0000200000000200 RBP: fffffffffffffffe R08: 0000001b30720000 R09: 0000000000000001 R10: 7ffffffffffffff9 R11: 0000000000000009 R12: 0000000000000000 R13: 00007fdebbccefac R14: 000000000001956d R15: 00007fdebbccefa0