ocfs2: Slot 0 on device (7,7) was already allocated to this node!
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/ocfs2/alloc.c:1839:11
index 0 is out of range for type 'struct ocfs2_extent_rec[] __counted_by(l_count)' (aka 'struct ocfs2_extent_rec[]')
CPU: 0 UID: 0 PID: 8801 Comm: syz.7.360 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 ubsan_epilogue+0x14/0x48 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xd0/0xfc lib/ubsan.c:455
 __ocfs2_find_path+0x4f8/0x8b8 fs/ocfs2/alloc.c:1839
 ocfs2_find_leaf+0xb4/0x1d0 fs/ocfs2/alloc.c:1947
 ocfs2_get_clusters_nocache+0x13c/0xa30 fs/ocfs2/extent_map.c:418
 ocfs2_get_clusters+0x414/0x844 fs/ocfs2/extent_map.c:631
 ocfs2_extent_map_get_blocks+0x194/0x564 fs/ocfs2/extent_map.c:678
 ocfs2_bmap+0x29c/0x694 fs/ocfs2/aops.c:459
 bmap+0xa8/0xe8 fs/inode.c:2040
 jbd2_journal_init_inode+0x8c/0x32c fs/jbd2/journal.c:1675
 ocfs2_journal_init+0x454/0xbd4 fs/ocfs2/journal.c:964
 ocfs2_check_volume fs/ocfs2/super.c:2345 [inline]
 ocfs2_mount_volume fs/ocfs2/super.c:1762 [inline]
 ocfs2_fill_super+0x3278/0x532c fs/ocfs2/super.c:1083
 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691
 get_tree_bdev+0x2c/0x3c fs/super.c:1714
 ocfs2_get_tree+0x28/0x38 fs/ocfs2/super.c:1184
 vfs_get_tree+0x90/0x28c fs/super.c:1751
 fc_mount fs/namespace.c:1199 [inline]
 do_new_mount_fc fs/namespace.c:3636 [inline]
 do_new_mount+0x284/0x944 fs/namespace.c:3712
 path_mount+0x5b4/0xdfc fs/namespace.c:4022
 do_mount fs/namespace.c:4035 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount fs/namespace.c:4201 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4201
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
---[ end trace ]---
OCFS2: ERROR (device loop7): int ocfs2_validate_extent_block(struct super_block *, struct buffer_head *): Extent block #640 has bad signature À;9˜
On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted.
OCFS2: File system is now read-only.
(syz.7.360,8801,1):__ocfs2_find_path:1853 ERROR: status = -30
(syz.7.360,8801,1):ocfs2_find_leaf:1949 ERROR: status = -30
(syz.7.360,8801,1):ocfs2_get_clusters_nocache:421 ERROR: status = -30
(syz.7.360,8801,1):ocfs2_get_clusters:634 ERROR: status = -30
(syz.7.360,8801,1):ocfs2_extent_map_get_blocks:681 ERROR: status = -30
(syz.7.360,8801,1):ocfs2_bmap:469 ERROR: get_blocks() failed, block = 0
(syz.7.360,8801,1):ocfs2_bmap:470 ERROR: status = -30
jbd2_journal_init_inode: Cannot locate journal superblock
(syz.7.360,8801,1):ocfs2_journal_init:966 ERROR: Linux journal layer error
(syz.7.360,8801,1):ocfs2_check_volume:2347 ERROR: Could not initialize journal!
(syz.7.360,8801,1):ocfs2_check_volume:2432 ERROR: status = -22
(syz.7.360,8801,1):ocfs2_mount_volume:1764 ERROR: status = -22
(syz.7.360,8801,1):ocfs2_fill_super:1177 ERROR: status = -22