ocfs2: Mounting device (7,4) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 5.15.180-syzkaller #0 Not tainted ------------------------------------------------------ syz.4.142/4738 is trying to acquire lock: ffff88801b7b9488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x1a1/0x7b0 fs/ocfs2/sysfile.c:101 but task is already holding lock: ffff88806129bf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_expand_inline_dir fs/ocfs2/dir.c:2819 [inline] ffff88806129bf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_extend_dir+0x7ed/0x5270 fs/ocfs2/dir.c:3200 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}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x2b3/0xa10 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+0x433/0x2550 fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0xea/0x310 fs/ocfs2/dir.c:1995 ocfs2_lookup_ino_from_name+0xad/0x1e0 fs/ocfs2/dir.c:2017 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x314/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x328/0x720 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2276 [inline] ocfs2_fill_super+0x47b3/0x5890 fs/ocfs2/super.c:995 mount_bdev+0x2c9/0x3f0 fs/super.c:1400 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 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+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 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+0x1a1/0x7b0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0x103/0x27a0 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b4/0xb50 fs/ocfs2/suballoc.c:1162 ocfs2_expand_inline_dir fs/ocfs2/dir.c:2855 [inline] ocfs2_extend_dir+0x8a4/0x5270 fs/ocfs2/dir.c:3200 ocfs2_prepare_dir_for_insert+0x34cd/0x5eb0 fs/ocfs2/dir.c:4321 ocfs2_mknod+0xd84/0x2cd0 fs/ocfs2/namei.c:294 ocfs2_create+0x194/0x430 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x130a/0x2f20 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13b/0x4f0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_creat fs/open.c:1345 [inline] __se_sys_creat fs/open.c:1339 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1339 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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.4.142/4738: #0: ffff88807ad5c460 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff88806129c2c8 (&type->i_mutex_dir_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff88806129c2c8 (&type->i_mutex_dir_key#9){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3529 [inline] #1: ffff88806129c2c8 (&type->i_mutex_dir_key#9){+.+.}-{3:3}, at: path_openat+0x824/0x2f20 fs/namei.c:3739 #2: ffff88806129bf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_expand_inline_dir fs/ocfs2/dir.c:2819 [inline] #2: ffff88806129bf60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_extend_dir+0x7ed/0x5270 fs/ocfs2/dir.c:3200 stack backtrace: CPU: 1 PID: 4738 Comm: syz.4.142 Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 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+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 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+0x1a1/0x7b0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0x103/0x27a0 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b4/0xb50 fs/ocfs2/suballoc.c:1162 ocfs2_expand_inline_dir fs/ocfs2/dir.c:2855 [inline] ocfs2_extend_dir+0x8a4/0x5270 fs/ocfs2/dir.c:3200 ocfs2_prepare_dir_for_insert+0x34cd/0x5eb0 fs/ocfs2/dir.c:4321 ocfs2_mknod+0xd84/0x2cd0 fs/ocfs2/namei.c:294 ocfs2_create+0x194/0x430 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x130a/0x2f20 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13b/0x4f0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_creat fs/open.c:1345 [inline] __se_sys_creat fs/open.c:1339 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1339 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f351f85f169 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:00007f351d6c7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f351fa86fa0 RCX: 00007f351f85f169 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000004c0 RBP: 00007f351f8e1a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f351fa86fa0 R15: 00007ffd0ce24fc8 syz.4.142 (4738) used greatest stack depth: 17424 bytes left