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
oldfs: cannot read superblock
------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 1 PID: 6095 at fs/buffer.c:1229 __brelse fs/buffer.c:1229 [inline]
WARNING: CPU: 1 PID: 6095 at fs/buffer.c:1229 __brelse+0x6d/0xb0 fs/buffer.c:1223
Modules linked in:
CPU: 1 UID: 0 PID: 6095 Comm: syz.4.45 Not tainted 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__brelse fs/buffer.c:1229 [inline]
RIP: 0010:__brelse+0x6d/0xb0 fs/buffer.c:1223
Code: 84 d2 75 52 44 8b 63 60 31 ff 44 89 e6 e8 cb 28 79 ff 45 85 e4 75 20 e8 c1 2d 79 ff 90 48 c7 c7 e0 99 7f 8b e8 44 5e 39 ff 90 <0f> 0b 90 90 5b 5d 41 5c e9 a6 2d 79 ff e8 a1 2d 79 ff be 04 00 00
RSP: 0018:ffffc90004787bf0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: ffff88807832a570 RCX: ffffc90012a8a000
RDX: 0000000000080000 RSI: ffffffff817a2276 RDI: 0000000000000001
RBP: ffff88807832a5d0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88807832a570 R14: dffffc0000000000 R15: dffffc0000000000
FS:  00007fe3f87916c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3e803ff000 CR3: 000000007bcf0000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 brelse include/linux/buffer_head.h:324 [inline]
 __invalidate_bh_lrus fs/buffer.c:1498 [inline]
 invalidate_bh_lru+0xa2/0x190 fs/buffer.c:1511
 csd_do_func kernel/smp.c:134 [inline]
 smp_call_function_many_cond+0xda2/0x12c0 kernel/smp.c:876
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0xf1/0x290 block/bdev.c:670
 blkdev_put_whole+0xc4/0xf0 block/bdev.c:677
 bdev_release+0x47e/0x6d0 block/bdev.c:1102
 blkdev_release+0x15/0x20 block/fops.c:660
 __fput+0x402/0xb70 fs/file_table.c:464
 task_work_run+0x151/0x250 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe3fad8e90a
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:00007fe3f8790e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffea RBX: 00007fe3f8790ef0 RCX: 00007fe3fad8e90a
RDX: 0000400000000000 RSI: 0000400000000100 RDI: 00007fe3f8790eb0
RBP: 0000400000000000 R08: 00007fe3f8790ef0 R09: 0000000002000412
R10: 0000000002000412 R11: 0000000000000246 R12: 0000400000000100
R13: 00007fe3f8790eb0 R14: 0000000000009eb9 R15: 0000400000000400
 </TASK>