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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d358e5254674 Merge tag 'for-6.19/dm-changes' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15800592580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f315601b98a91c0b dashboard link: https://syzkaller.appspot.com/bug?extid=151afab124dfbc5f15e6 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=148d91c2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c3161a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/605b74c6e6cd/disk-d358e525.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ec0e108fb585/vmlinux-d358e525.xz kernel image: https://storage.googleapis.com/syzbot-assets/29e316e5a13d/bzImage-d358e525.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2f95504bd292/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=14ec261a580000) Bisection is inconclusive: the first bad commit could be any of: 2f26f58df041 ocfs2: annotate flexible array members with __counted_by_le() cd4eaccc00d7 treewide: drop outdated compiler version remarks in Kconfig help texts 1b34743c31fe ocfs2: add extra consistency check to ocfs2_dx_dir_lookup_rec() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=109551c2580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+151afab124dfbc5f15e6@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in fs/ocfs2/alloc.c:1838:11 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: 6062 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:455 __ocfs2_find_path+0x606/0xa40 fs/ocfs2/alloc.c:1838 ocfs2_find_leaf+0xab/0x1c0 fs/ocfs2/alloc.c:1946 ocfs2_get_clusters_nocache+0x172/0xc60 fs/ocfs2/extent_map.c:418 ocfs2_get_clusters+0x505/0xa70 fs/ocfs2/extent_map.c:631 ocfs2_extent_map_get_blocks+0x202/0x6a0 fs/ocfs2/extent_map.c:678 ocfs2_read_virt_blocks+0x286/0x930 fs/ocfs2/extent_map.c:1001 ocfs2_read_dir_block fs/ocfs2/dir.c:521 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:728 [inline] ocfs2_find_entry+0x3e4/0x2090 fs/ocfs2/dir.c:1120 ocfs2_find_files_on_disk+0xdf/0x310 fs/ocfs2/dir.c:2023 ocfs2_lookup_ino_from_name+0x52/0x100 fs/ocfs2/dir.c:2045 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x326/0x770 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x319/0x660 fs/ocfs2/super.c:461 ocfs2_initialize_super fs/ocfs2/super.c:2196 [inline] ocfs2_fill_super+0x4432/0x65b0 fs/ocfs2/super.c:993 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6175f30eea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffefc9145f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffefc914680 RCX: 00007f6175f30eea RDX: 0000200000004440 RSI: 0000200000000340 RDI: 00007ffefc914640 RBP: 0000200000004440 R08: 00007ffefc914680 R09: 0000000000004000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000200000000340 R13: 00007ffefc914640 R14: 0000000000004463 R15: 0000200000000300 ---[ end trace ]--- --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup