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.0.4474/19711 is trying to acquire lock: ffff888057c69488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x1b6/0x7f0 fs/ocfs2/sysfile.c:101 but task is already holding lock: ffff888071198660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_expand_inline_dir fs/ocfs2/dir.c:2819 [inline] ffff888071198660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_extend_dir+0x691/0x4a20 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}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x237/0x8d0 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+0x3ca/0x2060 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+0x32b/0x7f0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x2f3/0x6d0 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2279 [inline] ocfs2_fill_super+0x4060/0x50f0 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: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+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1e3/0x2400 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+0x1b6/0x7f0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x12b/0x44d0 fs/ocfs2/suballoc.c:776 ocfs2_reserve_new_metadata_blocks+0x412/0x9a0 fs/ocfs2/suballoc.c:978 ocfs2_expand_inline_dir fs/ocfs2/dir.c:2838 [inline] ocfs2_extend_dir+0xcc9/0x4a20 fs/ocfs2/dir.c:3200 ocfs2_prepare_dir_for_insert+0x2fc2/0x53c0 fs/ocfs2/dir.c:4321 ocfs2_mknod+0x860/0x2510 fs/ocfs2/namei.c:294 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x11db/0x2fa0 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x150/0x4b0 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_creat fs/open.c:1347 [inline] __se_sys_creat fs/open.c:1341 [inline] __x64_sys_creat+0x8c/0xb0 fs/open.c:1341 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: 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.0.4474/19711: #0: ffff8880649b6460 (sb_writers#32){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:386 #1: ffff8880711989c8 (&type->i_mutex_dir_key#17){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff8880711989c8 (&type->i_mutex_dir_key#17){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3537 [inline] #1: ffff8880711989c8 (&type->i_mutex_dir_key#17){+.+.}-{3:3}, at: path_openat+0x803/0x2fa0 fs/namei.c:3747 #2: ffff888071198660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_expand_inline_dir fs/ocfs2/dir.c:2819 [inline] #2: ffff888071198660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_extend_dir+0x691/0x4a20 fs/ocfs2/dir.c:3200 stack backtrace: CPU: 0 PID: 19711 Comm: syz.0.4474 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1e3/0x2400 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+0x1b6/0x7f0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x12b/0x44d0 fs/ocfs2/suballoc.c:776 ocfs2_reserve_new_metadata_blocks+0x412/0x9a0 fs/ocfs2/suballoc.c:978 ocfs2_expand_inline_dir fs/ocfs2/dir.c:2838 [inline] ocfs2_extend_dir+0xcc9/0x4a20 fs/ocfs2/dir.c:3200 ocfs2_prepare_dir_for_insert+0x2fc2/0x53c0 fs/ocfs2/dir.c:4321 ocfs2_mknod+0x860/0x2510 fs/ocfs2/namei.c:294 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x11db/0x2fa0 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x150/0x4b0 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_creat fs/open.c:1347 [inline] __se_sys_creat fs/open.c:1341 [inline] __x64_sys_creat+0x8c/0xb0 fs/open.c:1341 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: 0033:0x7f596e3bfeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f596c61b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f596e63afa0 RCX: 00007f596e3bfeb9 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000200000000e00 RBP: 00007f596e42dc1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f596e63b038 R14: 00007f596e63afa0 R15: 00007ffd585e2788 OCFS2: ERROR (device loop0): int ocfs2_validate_gd_parent(struct super_block *, struct ocfs2_dinode *, struct buffer_head *, int): Group descriptor #32 has bit count of 1024 On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: File system is now read-only. (syz.0.4474,19711,1):ocfs2_search_chain:1761 ERROR: status = -30 (syz.0.4474,19711,1):ocfs2_search_chain:1871 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_claim_suballoc_bits:1950 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_claim_suballoc_bits:1993 ERROR: status = -30 (syz.0.4474,19711,1):__ocfs2_claim_clusters:2365 ERROR: status = -30 (syz.0.4474,19711,1):__ocfs2_claim_clusters:2373 ERROR: status = -30 (syz.0.4474,19711,1):ocfs2_block_group_alloc_contig:433 ERROR: status = -30 (syz.0.4474,19711,1):ocfs2_block_group_alloc:705 ERROR: status = -30 (syz.0.4474,19711,1):ocfs2_block_group_alloc:758 ERROR: status = -30 (syz.0.4474,19711,1):ocfs2_reserve_suballoc_bits:833 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_reserve_suballoc_bits:850 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_reserve_new_metadata_blocks:990 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_reserve_new_metadata_blocks:1013 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_expand_inline_dir:2840 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_extend_dir:3204 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_prepare_dir_for_insert:4325 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_mknod:298 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_mknod:502 ERROR: status = -30 (syz.0.4474,19711,0):ocfs2_create:676 ERROR: status = -30 ocfs2: Unmounting device (7,0) on (node local) syz.0.4474 (19711) used greatest stack depth: 16888 bytes left