oldfs: cannot read superblock
------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 3 PID: 5569 at fs/buffer.c:1239 __brelse fs/buffer.c:1239 [inline]
WARNING: CPU: 3 PID: 5569 at fs/buffer.c:1239 __brelse+0x6d/0xb0 fs/buffer.c:1233
Modules linked in:
CPU: 3 UID: 0 PID: 5569 Comm: syz-executor.0 Not tainted 6.11.0-rc5-syzkaller-g5be63fc19fca #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__brelse fs/buffer.c:1239 [inline]
RIP: 0010:__brelse+0x6d/0xb0 fs/buffer.c:1233
Code: 84 d2 75 52 44 8b 63 60 31 ff 44 89 e6 e8 6b af 80 ff 45 85 e4 75 20 e8 21 ad 80 ff 90 48 c7 c7 e0 4c 5e 8b e8 d4 f8 42 ff 90 <0f> 0b 90 90 5b 5d 41 5c e9 06 ad 80 ff e8 01 ad 80 ff be 04 00 00
RSP: 0018:ffffc90003367b68 EFLAGS: 00010086
RAX: 0000000000000000 RBX: ffff888032049910 RCX: ffffffff814cc6c9
RDX: ffff888029faa440 RSI: ffffffff814cc6d6 RDI: 0000000000000001
RBP: ffff888032049970 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888032049910 R14: dffffc0000000000 R15: ffff88806b33ffc0
FS:  00007f2df738c6c0(0000) GS:ffff88806b300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c574c5ac38 CR3: 00000000248ae000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 brelse include/linux/buffer_head.h:325 [inline]
 __invalidate_bh_lrus fs/buffer.c:1508 [inline]
 invalidate_bh_lru+0xa2/0x190 fs/buffer.c:1521
 csd_do_func kernel/smp.c:134 [inline]
 smp_call_function_many_cond+0x10af/0x1420 kernel/smp.c:847
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023
 kill_bdev block/bdev.c:89 [inline]
 blkdev_flush_mapping+0xf1/0x290 block/bdev.c:664
 blkdev_put_whole+0xc4/0xf0 block/bdev.c:671
 bdev_release+0x496/0x6f0 block/bdev.c:1096
 blkdev_release+0x15/0x20 block/fops.c:638
 __fput+0x408/0xbb0 fs/file_table.c:422
 task_work_run+0x14e/0x250 kernel/task_work.c:228
 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:328 [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: 0033:0x7f2df667f4aa
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:00007f2df738bef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffea RBX: 00007f2df738bf80 RCX: 00007f2df667f4aa
RDX: 0000000020009e00 RSI: 0000000020009e40 RDI: 00007f2df738bf40
RBP: 0000000020009e00 R08: 00007f2df738bf80 R09: 0000000000008003
R10: 0000000000008003 R11: 0000000000000246 R12: 0000000020009e40
R13: 00007f2df738bf40 R14: 0000000000009dfc R15: 0000000020000000
 </TASK>