syzbot

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: 5838 at fs/buffer.c:1235 __brelse fs/buffer.c:1235 [inline]
WARNING: CPU: 0 PID: 5838 at fs/buffer.c:1235 brelse include/linux/buffer_head.h:324 [inline]
WARNING: CPU: 0 PID: 5838 at fs/buffer.c:1235 __invalidate_bh_lrus fs/buffer.c:1504 [inline]
WARNING: CPU: 0 PID: 5838 at fs/buffer.c:1235 invalidate_bh_lru+0x102/0x1b0 fs/buffer.c:1517
Modules linked in:
CPU: 0 UID: 0 PID: 5838 Comm: syz-executor395 Not tainted 6.12.0-rc7-syzkaller-00125-gcfaaa7d010d1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:__brelse fs/buffer.c:1235 [inline]
RIP: 0010:brelse include/linux/buffer_head.h:324 [inline]
RIP: 0010:__invalidate_bh_lrus fs/buffer.c:1504 [inline]
RIP: 0010:invalidate_bh_lru+0x102/0x1b0 fs/buffer.c:1517
Code: 34 51 db ff f0 ff 0b eb 25 e8 1a 95 74 ff 41 80 3c 2e 00 75 2a eb 30 e8 0c 95 74 ff 90 48 c7 c7 a0 7c 19 8c e8 df 8a 35 ff 90 <0f> 0b 90 90 48 bd 00 00 00 00 00 fc ff df 41 80 3c 2e 00 74 08 4c
RSP: 0018:ffffc90003c9f8e8 EFLAGS: 00010046
RAX: 8e66b1f4b4891b00 RBX: ffff888079ff5400 RCX: ffff88807ee88000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8155e222 R09: 1ffff110170c519a
R10: dffffc0000000000 R11: ffffed10170c519b R12: ffff8880b8639940
R13: 0000000000000000 R14: 1ffff110170c7328 R15: ffff8880b8639940
FS:  00005555789fb380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e2d80f000 CR3: 0000000024bcc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 csd_do_func kernel/smp.c:134 [inline]
 smp_call_function_many_cond+0x1760/0x2ca0 kernel/smp.c:875
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1051
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0xfe/0x270 block/bdev.c:671
 blkdev_put_whole block/bdev.c:678 [inline]
 bdev_release+0x460/0x700 block/bdev.c:1103
 blkdev_release+0x15/0x20 block/fops.c:639
 __fput+0x23f/0x880 fs/file_table.c:431
 task_work_run+0x24f/0x310 kernel/task_work.c:239
 ptrace_notify+0x2d2/0x380 kernel/signal.c:2404
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work+0xc6/0x190 kernel/entry/common.c:173
 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]
 syscall_exit_to_user_mode+0x279/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e35cf0dea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd5fd6c88 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffea RBX: 00007fffd5fd6ca0 RCX: 00007f8e35cf0dea
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fffd5fd6ca0
RBP: 0000000000000004 R08: 00007fffd5fd6ce0 R09: 0000000000009eaf
R10: 0000000002000412 R11: 0000000000000282 R12: 0000000002000412
R13: 00007fffd5fd6ce0 R14: 0000000000000003 R15: 0000000000010000
 </TASK>