IPVS: ftp: loaded support on port[0] = 21
------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 0 PID: 8141 at fs/buffer.c:1144 __brelse fs/buffer.c:1144 [inline]
WARNING: CPU: 0 PID: 8141 at fs/buffer.c:1144 __brelse+0x67/0xa0 fs/buffer.c:1138
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8141 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__brelse fs/buffer.c:1144 [inline]
RIP: 0010:__brelse+0x67/0xa0 fs/buffer.c:1138
Code: 7c 04 84 d2 75 4e 44 8b 63 60 31 ff 44 89 e6 e8 bf 16 b2 ff 45 85 e4 75 1c e8 45 15 b2 ff 48 c7 c7 e0 1c 75 88 e8 1e 4d 42 06 <0f> 0b 5b 5d 41 5c e9 2e 15 b2 ff e8 29 15 b2 ff be 04 00 00 00 48
RSP: 0018:ffff8880a2c7fb70 EFLAGS: 00010086
RAX: 0000000000000000 RBX: ffff88808fc0db28 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed101458ff60
RBP: ffff88808fc0db88 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: ffffffff8c66501b R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880ba0287e0 R15: ffffffff81b08270
 brelse include/linux/buffer_head.h:297 [inline]
 invalidate_bh_lru+0x90/0x140 fs/buffer.c:1385
 on_each_cpu_mask+0xf7/0x240 kernel/smp.c:636
 on_each_cpu_cond+0x12d/0x1c0 kernel/smp.c:684
 kill_bdev fs/block_dev.c:85 [inline]
 __blkdev_put+0x29e/0x870 fs/block_dev.c:1813
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f141725e547
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 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:00007ffd994a7ba8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f141725e547
RDX: 00007ffd994a7c7a RSI: 000000000000000a RDI: 00007ffd994a7c70
RBP: 00007ffd994a7c70 R08: 00000000ffffffff R09: 00007ffd994a7a40
R10: 0000555556888903 R11: 0000000000000246 R12: 00007f14172b7b24
R13: 00007ffd994a8d30 R14: 0000555556888810 R15: 00007ffd994a8d70
Kernel Offset: disabled
Rebooting in 86400 seconds..