====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.604/5916 is trying to acquire lock: ffff0000f61f5488 (&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: ffff0000e125b120 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_extend_file+0x10c/0x4dc fs/ocfs2/file.c:1072 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:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x27c8/0x6610 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5662 __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:1162 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline] ocfs2_lock_allocators+0x270/0x530 fs/ocfs2/suballoc.c:2679 ocfs2_extend_allocation+0x37c/0x1760 fs/ocfs2/file.c:585 ocfs2_extend_no_holes+0x1a4/0x438 fs/ocfs2/file.c:1027 ocfs2_extend_file+0x1a8/0x4dc fs/ocfs2/file.c:1095 ocfs2_setattr+0x84c/0x1950 fs/ocfs2/file.c:1214 notify_change+0xb5c/0xe20 fs/attr.c:499 do_truncate+0x188/0x20c fs/open.c:65 do_sys_ftruncate+0x284/0x318 fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202 __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.3.604/5916: #0: ffff0000d1524460 (sb_writers#18){.+.+}-{0:0}, at: do_sys_ftruncate+0x210/0x318 fs/open.c:190 #1: ffff0000e125b488 (&sb->s_type->i_mutex_key#32){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000e125b488 (&sb->s_type->i_mutex_key#32){+.+.}-{3:3}, at: do_truncate+0x174/0x20c fs/open.c:63 #2: ffff0000e125b120 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_extend_file+0x10c/0x4dc fs/ocfs2/file.c:1072 stack backtrace: CPU: 0 PID: 5916 Comm: syz.3.604 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 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:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x27c8/0x6610 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5662 __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:1162 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline] ocfs2_lock_allocators+0x270/0x530 fs/ocfs2/suballoc.c:2679 ocfs2_extend_allocation+0x37c/0x1760 fs/ocfs2/file.c:585 ocfs2_extend_no_holes+0x1a4/0x438 fs/ocfs2/file.c:1027 ocfs2_extend_file+0x1a8/0x4dc fs/ocfs2/file.c:1095 ocfs2_setattr+0x84c/0x1950 fs/ocfs2/file.c:1214 notify_change+0xb5c/0xe20 fs/attr.c:499 do_truncate+0x188/0x20c fs/open.c:65 do_sys_ftruncate+0x284/0x318 fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202 __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