oldfs: cannot read superblock
------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 1 PID: 5491 at fs/buffer.c:1235 __brelse fs/buffer.c:1235 [inline]
WARNING: CPU: 1 PID: 5491 at fs/buffer.c:1235 __brelse+0x6d/0xb0 fs/buffer.c:1229
Modules linked in:
CPU: 1 PID: 5491 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__brelse fs/buffer.c:1235 [inline]
RIP: 0010:__brelse+0x6d/0xb0 fs/buffer.c:1229
Code: 84 d2 75 52 44 8b 63 60 31 ff 44 89 e6 e8 8b 05 83 ff 45 85 e4 75 20 e8 a1 0a 83 ff 90 48 c7 c7 00 15 1e 8b e8 b4 c0 45 ff 90 <0f> 0b 90 90 5b 5d 41 5c e9 86 0a 83 ff e8 81 0a 83 ff be 04 00 00
RSP: 0018:ffffc9000c7f7b70 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff88805c480d98 RCX: ffffc9000aae3000
RDX: 0000000000040000 RSI: ffffffff8150f3f6 RDI: 0000000000000001
RBP: ffff88805c480df8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88805c480d98 R14: dffffc0000000000 R15: ffff8880b953f880
FS:  00007fa18e0a06c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa18300f000 CR3: 0000000023eea000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 brelse include/linux/buffer_head.h:309 [inline]
 __invalidate_bh_lrus fs/buffer.c:1487 [inline]
 invalidate_bh_lru+0xa2/0x190 fs/buffer.c:1500
 csd_do_func kernel/smp.c:133 [inline]
 smp_call_function_many_cond+0x124a/0x1590 kernel/smp.c:846
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023
 kill_bdev block/bdev.c:84 [inline]
 blkdev_flush_mapping+0x13a/0x310 block/bdev.c:644
 blkdev_put_whole+0xc4/0xf0 block/bdev.c:675
 bdev_release+0x5d5/0xb30 block/bdev.c:1044
 blkdev_release+0x15/0x20 block/fops.c:628
 __fput+0x273/0xb80 fs/file_table.c:422
 task_work_run+0x151/0x250 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x275/0x2a0 kernel/entry/common.c:212
 do_syscall_64+0xe2/0x260 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fa18d27f56a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa18e09fef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffea RBX: 00007fa18e09ff80 RCX: 00007fa18d27f56a
RDX: 0000000020000080 RSI: 0000000020000000 RDI: 00007fa18e09ff40
RBP: 0000000020000080 R08: 00007fa18e09ff80 R09: 0000000000004000
R10: 0000000000004000 R11: 0000000000000202 R12: 0000000020000000
R13: 00007fa18e09ff40 R14: 0000000000009e81 R15: 0000000020000140
 </TASK>