VFS: Found a Xenix FS (block size = 1024) on device loop0
Bad inode number on dev loop0: 2 is out of range
SysV FS: get root inode failed
oldfs: cannot read superblock
------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 0 PID: 4988 at fs/buffer.c:1148 __brelse fs/buffer.c:1148 [inline]
WARNING: CPU: 0 PID: 4988 at fs/buffer.c:1148 brelse include/linux/buffer_head.h:325 [inline]
WARNING: CPU: 0 PID: 4988 at fs/buffer.c:1148 __invalidate_bh_lrus fs/buffer.c:1394 [inline]
WARNING: CPU: 0 PID: 4988 at fs/buffer.c:1148 invalidate_bh_lru+0xf8/0x1a0 fs/buffer.c:1407
Modules linked in:
CPU: 0 PID: 4988 Comm: syz.0.15 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__brelse fs/buffer.c:1148 [inline]
RIP: 0010:brelse include/linux/buffer_head.h:325 [inline]
RIP: 0010:__invalidate_bh_lrus fs/buffer.c:1394 [inline]
RIP: 0010:invalidate_bh_lru+0xf8/0x1a0 fs/buffer.c:1407
Code: 00 e8 cc 89 e4 ff f0 ff 0b eb 21 e8 92 97 9a ff 41 80 3c 2e 00 75 26 eb 2c e8 84 97 9a ff 48 c7 c7 a0 61 b7 8a e8 48 56 66 ff <0f> 0b 48 bd 00 00 00 00 00 fc ff df 41 80 3c 2e 00 74 08 4c 89 ff
RSP: 0018:ffffc900030ef948 EFLAGS: 00010046
RAX: a35993bf8daee300 RBX: ffff8880270d6c28 RCX: ffff88801e5d0000
RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8166728c R09: ffffed10171c4f24
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880b8e36538
R13: 0000000000000000 R14: 1ffff110171c6ca7 R15: ffff8880b8e36538
FS:  00007f7ff963b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c31eb526a8 CR3: 0000000024621000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 smp_call_function_many_cond+0x8fa/0xd90 kernel/smp.c:960
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
 kill_bdev block/bdev.c:76 [inline]
 blkdev_flush_mapping+0x178/0x340 block/bdev.c:659
 blkdev_put_whole block/bdev.c:690 [inline]
 blkdev_put+0x4f1/0x790 block/bdev.c:957
 deactivate_locked_super+0xa0/0x110 fs/super.c:335
 mount_bdev+0x2e5/0x3f0 fs/super.c:1402
 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/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7ffa3bceba
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:00007f7ff963ae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7ff963aef0 RCX: 00007f7ffa3bceba
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7ff963aeb0
RBP: 0000000020000000 R08: 00007f7ff963aef0 R09: 0000000002000412
R10: 0000000002000412 R11: 0000000000000246 R12: 0000000020000100
R13: 00007f7ff963aeb0 R14: 0000000000009eb5 R15: 0000000020000040
 </TASK>