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: 0 PID: 5715 at fs/buffer.c:1148 __brelse+0x8c/0xec fs/buffer.c:1148
Modules linked in:
CPU: 0 PID: 5715 Comm: syz.4.567 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __brelse+0x8c/0xec fs/buffer.c:1148
lr : __brelse+0x8c/0xec fs/buffer.c:1148
sp : ffff8000203e7900
x29: ffff8000203e7900 x28: ffff800011e72b00 x27: 0000000000000000
x26: ffff0000e7ea9cb0 x25: ffff0000e7ea9cb0 x24: 0000000000000002
x23: ffff0000dbba4160 x22: ffff0000e5d00440 x21: 0000000000000000
x20: 0000000000000000 x19: ffff0000e7ea9d10 x18: 0000000000000001
x17: 0000000000000002 x16: ffff800011ab8a34 x15: 00000000ffffffff
x14: ffff0000c83d0000 x13: 0000000000000001 x12: 0000000000080000
x11: 000000000001cb56 x10: ffff800026a09000 x9 : 03565bdc44f6fa00
x8 : 03565bdc44f6fa00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000203e7078 x4 : ffff800014ba05e0 x3 : ffff800008555e80
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000027
Call trace:
 __brelse+0x8c/0xec fs/buffer.c:1148
 brelse include/linux/buffer_head.h:325 [inline]
 sysv_fill_super+0x510/0x5f8 fs/sysv/super.c:415
 mount_bdev+0x274/0x370 fs/super.c:1400
 sysv_mount+0x44/0x58 fs/sysv/super.c:534
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611
 vfs_get_tree+0x90/0x274 fs/super.c:1530
 do_new_mount+0x278/0x8fc fs/namespace.c:3012
 path_mount+0x594/0x101c fs/namespace.c:3342
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount fs/namespace.c:3540 [inline]
 __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3540
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 1188
hardirqs last  enabled at (1187): [<ffff80000832c128>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (1188): [<ffff800011ab40c0>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (848): [<ffff8000080308b0>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (846): [<ffff80000803087c>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace 23d2a7de30b08617 ]---
oldfs: cannot read superblock