ocfs2: Mounting device (7,6) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.6.13426/7057 is trying to acquire lock: ffff888069971488 (&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: ffff888057bb94a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x2d7/0xb10 fs/ocfs2/mmap.c:142 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_local_alloc_bits+0xfb/0x25f0 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1162 ocfs2_convert_inline_data_to_extents+0x1fc/0x1330 fs/ocfs2/alloc.c:7071 ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1564 [inline] ocfs2_write_begin_nolock+0x1915/0x4400 fs/ocfs2/aops.c:1671 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:93 [inline] ocfs2_page_mkwrite+0x5d6/0xb10 fs/ocfs2/mmap.c:144 do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922 do_shared_fault mm/memory.c:4328 [inline] do_fault mm/memory.c:4396 [inline] handle_pte_fault mm/memory.c:4650 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x1d87/0x4410 mm/memory.c:4883 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357 handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:205 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] copyout lib/iov_iter.c:157 [inline] _copy_to_iter+0x318/0x1180 lib/iov_iter.c:669 copy_to_iter include/linux/uio.h:155 [inline] get_random_bytes_user+0x1cc/0x3d0 drivers/char/random.c:474 __do_sys_getrandom drivers/char/random.c:1242 [inline] __se_sys_getrandom drivers/char/random.c:1215 [inline] __x64_sys_getrandom+0x1c2/0x2a0 drivers/char/random.c:1215 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.6.13426/7057: #0: ffff88801efc4e28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock+0x1c/0x50 include/linux/mmap_lock.h:117 #1: ffff88807c1f8558 (sb_pagefaults#3){.+.+}-{0:0}, at: do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922 #2: ffff888057bb94a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x2d7/0xb10 fs/ocfs2/mmap.c:142 stack backtrace: CPU: 0 PID: 7057 Comm: syz.6.13426 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_local_alloc_bits+0xfb/0x25f0 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1162 ocfs2_convert_inline_data_to_extents+0x1fc/0x1330 fs/ocfs2/alloc.c:7071 ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1564 [inline] ocfs2_write_begin_nolock+0x1915/0x4400 fs/ocfs2/aops.c:1671 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:93 [inline] ocfs2_page_mkwrite+0x5d6/0xb10 fs/ocfs2/mmap.c:144 do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922 do_shared_fault mm/memory.c:4328 [inline] do_fault mm/memory.c:4396 [inline] handle_pte_fault mm/memory.c:4650 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x1d87/0x4410 mm/memory.c:4883 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357 handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:206 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 89 d1 83 f8 RSP: 0018:ffffc90003917b38 EFLAGS: 00050246 RAX: ffffffff83e17c01 RBX: 0000000000000040 RCX: 0000000000000040 RDX: 0000000000000040 RSI: ffffc90003917d40 RDI: 0000200000000240 RBP: ffffc90003917c90 R08: ffffc90003917d7f R09: 1ffff92000722faf R10: dffffc0000000000 R11: fffff52000722fb0 R12: ffffc90003917d40 R13: dffffc00000000ff R14: 0000200000000240 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] copyout lib/iov_iter.c:157 [inline] _copy_to_iter+0x318/0x1180 lib/iov_iter.c:669 copy_to_iter include/linux/uio.h:155 [inline] get_random_bytes_user+0x1cc/0x3d0 drivers/char/random.c:474 __do_sys_getrandom drivers/char/random.c:1242 [inline] __se_sys_getrandom drivers/char/random.c:1215 [inline] __x64_sys_getrandom+0x1c2/0x2a0 drivers/char/random.c:1215 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: 0033:0x7f6f5bf44eb9 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:00007f6f5a1a0028 EFLAGS: 00000246 ORIG_RAX: 000000000000013e RAX: ffffffffffffffda RBX: 00007f6f5c1bffa0 RCX: 00007f6f5bf44eb9 RDX: 0000000000000004 RSI: 000000000000fce3 RDI: 0000200000000240 RBP: 00007f6f5bfb2c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6f5c1c0038 R14: 00007f6f5c1bffa0 R15: 00007ffdb25a43b8 OCFS2: ERROR (device loop6): 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.6.13426,7057,0):ocfs2_search_chain:1761 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_search_chain:1871 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_claim_suballoc_bits:1950 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_claim_suballoc_bits:1993 ERROR: status = -30 (syz.6.13426,7057,0):__ocfs2_claim_clusters:2365 ERROR: status = -30 (syz.6.13426,7057,0):__ocfs2_claim_clusters:2373 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_local_alloc_new_window:1203 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_local_alloc_new_window:1228 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_local_alloc_slide_window:1302 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_local_alloc_slide_window:1321 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_reserve_local_alloc_bits:671 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_reserve_local_alloc_bits:709 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_reserve_clusters_with_limit:1166 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_reserve_clusters_with_limit:1215 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_convert_inline_data_to_extents:7073 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_try_to_write_inline_data:1566 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_write_begin_nolock:1678 ERROR: status = -30 (syz.6.13426,7057,0):__ocfs2_page_mkwrite:97 ERROR: status = -30 OCFS2: ERROR (device loop6): 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. (syz.6.13426,7057,0):ocfs2_search_chain:1761 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_search_chain:1871 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_claim_suballoc_bits:1950 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_claim_suballoc_bits:1993 ERROR: status = -30 (syz.6.13426,7057,0):__ocfs2_claim_clusters:2365 ERROR: status = -30 (syz.6.13426,7057,0):__ocfs2_claim_clusters:2373 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_local_alloc_new_window:1203 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_local_alloc_new_window:1228 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_local_alloc_slide_window:1302 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_local_alloc_slide_window:1321 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_reserve_local_alloc_bits:671 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_reserve_local_alloc_bits:709 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_reserve_clusters_with_limit:1166 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_reserve_clusters_with_limit:1215 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_convert_inline_data_to_extents:7073 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_try_to_write_inline_data:1566 ERROR: status = -30 (syz.6.13426,7057,0):ocfs2_write_begin_nolock:1678 ERROR: status = -30 (syz.6.13426,7057,0):__ocfs2_page_mkwrite:97 ERROR: status = -30 ---------------- Code disassembly (best guess): 0: 89 d1 mov %edx,%ecx 2: c1 e9 03 shr $0x3,%ecx 5: 83 e2 07 and $0x7,%edx 8: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) b: 89 d1 mov %edx,%ecx d: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) f: 31 c0 xor %eax,%eax 11: 0f 01 ca clac 14: c3 ret 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 0f 01 cb stac 1f: 83 fa 40 cmp $0x40,%edx 22: 0f 82 70 ff ff ff jb 0xffffff98 28: 89 d1 mov %edx,%ecx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 31 c0 xor %eax,%eax 2e: 0f 01 ca clac 31: c3 ret 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 89 d1 mov %edx,%ecx 3e: 83 .byte 0x83 3f: f8 clc