====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.787/6906 is trying to acquire lock: ffff0000d9ec9488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x158/0x68c fs/ocfs2/sysfile.c:101 but task is already holding lock: ffff0000f67d8660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x324/0xbfc 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+0x64/0x300 kernel/locking/rwsem.c:1520 ocfs2_read_virt_blocks+0x23c/0x8c8 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+0x314/0x1d90 fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0x128/0x40c 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+0x2c0/0x68c fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x2b4/0x5c0 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2253 [inline] ocfs2_fill_super+0x22ec/0x4198 fs/ocfs2/super.c:994 mount_bdev+0x264/0x35c fs/super.c:1443 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1186 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632 vfs_get_tree+0x90/0x278 fs/super.c:1573 do_new_mount+0x228/0x804 fs/namespace.c:3078 path_mount+0x5ac/0xe6c fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&osb->system_file_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 ocfs2_get_system_file_inode+0x158/0x68c fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0xcc/0x2830 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x188/0xa3c fs/ocfs2/suballoc.c:1184 ocfs2_reserve_clusters+0x3c/0x50 fs/ocfs2/suballoc.c:1245 ocfs2_convert_inline_data_to_extents+0x180/0xf40 fs/ocfs2/alloc.c:7078 ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1565 [inline] ocfs2_write_begin_nolock+0x73c/0x3a80 fs/ocfs2/aops.c:1672 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:92 [inline] ocfs2_page_mkwrite+0x5b0/0xbfc fs/ocfs2/mmap.c:143 do_page_mkwrite+0x140/0x35c mm/memory.c:3009 wp_page_shared+0x14c/0x544 mm/memory.c:3358 do_wp_page+0xc88/0xed4 mm/memory.c:3508 handle_pte_fault mm/memory.c:5047 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1520/0x3018 mm/memory.c:5292 __do_page_fault arch/arm64/mm/fault.c:499 [inline] do_page_fault+0x310/0x99c arch/arm64/mm/fault.c:583 do_mem_abort+0x70/0x198 arch/arm64/mm/fault.c:804 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0x50/0xac arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580 __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:-1 [inline] __sys_socketpair+0x14c/0x6d8 net/socket.c:1720 __do_sys_socketpair net/socket.c:1786 [inline] __se_sys_socketpair net/socket.c:1783 [inline] __arm64_sys_socketpair+0xa0/0xbc net/socket.c:1783 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 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.5.787/6906: #0: ffff0000de15c348 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff0000de15c348 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline] #0: ffff0000de15c348 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x38/0x2e0 mm/memory.c:5382 #1: ffff00010207a558 (sb_pagefaults#4){.+.+}-{0:0}, at: do_page_mkwrite+0x140/0x35c mm/memory.c:3009 #2: ffff0000f67d8660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x324/0xbfc fs/ocfs2/mmap.c:141 stack backtrace: CPU: 0 PID: 6906 Comm: syz.5.787 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 ocfs2_get_system_file_inode+0x158/0x68c fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0xcc/0x2830 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x188/0xa3c fs/ocfs2/suballoc.c:1184 ocfs2_reserve_clusters+0x3c/0x50 fs/ocfs2/suballoc.c:1245 ocfs2_convert_inline_data_to_extents+0x180/0xf40 fs/ocfs2/alloc.c:7078 ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1565 [inline] ocfs2_write_begin_nolock+0x73c/0x3a80 fs/ocfs2/aops.c:1672 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:92 [inline] ocfs2_page_mkwrite+0x5b0/0xbfc fs/ocfs2/mmap.c:143 do_page_mkwrite+0x140/0x35c mm/memory.c:3009 wp_page_shared+0x14c/0x544 mm/memory.c:3358 do_wp_page+0xc88/0xed4 mm/memory.c:3508 handle_pte_fault mm/memory.c:5047 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1520/0x3018 mm/memory.c:5292 __do_page_fault arch/arm64/mm/fault.c:499 [inline] do_page_fault+0x310/0x99c arch/arm64/mm/fault.c:583 do_mem_abort+0x70/0x198 arch/arm64/mm/fault.c:804 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0x50/0xac arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580 __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:-1 [inline] __sys_socketpair+0x14c/0x6d8 net/socket.c:1720 __do_sys_socketpair net/socket.c:1786 [inline] __se_sys_socketpair net/socket.c:1783 [inline] __arm64_sys_socketpair+0xa0/0xbc net/socket.c:1783 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585