VFS: Found a Xenix FS (block size = 1024) on device loop4
Bad inode number on dev loop4: 2 is out of range
SysV FS: get root inode failed
------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 1 PID: 4264 at fs/buffer.c:1148 __brelse+0x6b/0x90 fs/buffer.c:1148
Modules linked in:
CPU: 0 PID: 4264 Comm: syz.4.5 Not tainted 5.15.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__brelse+0x6b/0x90 fs/buffer.c:1148
Code: 74 17 e8 d8 9b 9a ff 48 89 df be 04 00 00 00 e8 8b 79 e4 ff f0 ff 0b eb 13 e8 c1 9b 9a ff 48 c7 c7 20 6e b7 8a e8 05 36 66 ff <0f> 0b 5b 5d c3 89 d9 80 e1 07 80 c1 03 38 c1 7c b8 48 89 df e8 ac
RSP: 0018:ffffc90003e7fbd8 EFLAGS: 00010246
RAX: f6a716e2f9acaf00 RBX: ffff888074d44b40 RCX: 0000000000080000
RDX: ffffc9000ce42000 RSI: 0000000000016011 RDI: 0000000000016012
RBP: 0000000000000000 R08: ffffffff8166aa6c R09: ffffed10171e67a8
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888074d44ae0
R13: ffff88807a377400 R14: ffff888074d44ae0 R15: ffff8880208a0000
FS:  00007fe724a066c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005564218a21c8 CR3: 000000005f6c9000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 brelse include/linux/buffer_head.h:325 [inline]
 sysv_fill_super+0x69e/0x790 fs/sysv/super.c:415
 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/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fe726b974ca
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:00007fe724a05e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe724a05ef0 RCX: 00007fe726b974ca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe724a05eb0
RBP: 0000000020000000 R08: 00007fe724a05ef0 R09: 0000000002000412
R10: 0000000002000412 R11: 0000000000000246 R12: 0000000020000100
R13: 00007fe724a05eb0 R14: 0000000000009eb9 R15: 0000000020000140
 </TASK>