Date:   Sun, 17 Jul 2022 14:18:44 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org
Cc:     yury.norov@...il.com, linux-kernel@...r.kernel.org
Subject: x86_64/kvm: kernel hangs on poweroff

Hi Alexander, all,

I found that the kernel hangs on poweroff for me on x86_64/kvm. I'm not
sure how to address this issue because there's no fresh code in do_exit().
This is reproduced on v5.19-rc6, rc3 and on v5.18.

The dmesg is below, and my config is attached.
My apologies if it's VFS-related.

Thanks,
Yury

[   22.036466] systemd-shutdown[1]: Syncing filesystems and block devices.
[   22.071446] systemd-shutdown[1]: Sending SIGTERM to remaining processes...
[   22.074137] systemd-journald[249]: Received SIGTERM from PID 1 (systemd-shutdow).
[   22.085763] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[   22.091697] systemd-shutdown[1]: Unmounting file systems.
[   22.093053] [473]: Remounting '/' read-only with options 'errors=remount-ro'.
[   22.103722] EXT4-fs (vda1): re-mounted. Quota mode: none.
[   22.105617] systemd-shutdown[1]: All filesystems unmounted.
[   22.106359] systemd-shutdown[1]: Deactivating swaps.
[   22.107056] systemd-shutdown[1]: All swaps deactivated.
[   22.108041] systemd-shutdown[1]: Detaching loop devices.
[   22.108888] systemd-shutdown[1]: All loop devices detached.
[   22.109628] systemd-shutdown[1]: Stopping MD devices.
[   22.110368] systemd-shutdown[1]: All MD devices stopped.
[   22.111069] systemd-shutdown[1]: Detaching DM devices.
[   22.112085] systemd-shutdown[1]: All DM devices detached.
[   22.112955] systemd-shutdown[1]: All filesystems, swaps, loop devices, MD devices and DM devices detached.
[   22.115825] systemd-shutdown[1]: Syncing filesystems and block devices.
[   22.116738] systemd-shutdown[1]: Powering off.
[   22.119564] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[   22.157725] ACPI: PM: Preparing to enter system sleep state S5
[   22.160354] reboot: Power down
[   22.162259] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000
[   22.163539] CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 5.19.0-rc6 #198
[   22.164327] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
[   22.164327] Call Trace:
[   22.164327]  <TASK>
[   22.164327]  dump_stack_lvl+0x34/0x44
[   22.164327]  panic+0x107/0x28a
[   22.164327]  do_exit.cold+0x15/0x15
[   22.164327]  ? sys_off_notify+0x3e/0x60
[   22.164327]  __do_sys_reboot+0x1df/0x220
[   22.164327]  ? vfs_writev+0xc7/0x190
[   22.164327]  ? virtio_crypto_ctrl_vq_request+0xd0/0xd0
[   22.164327]  ? fpregs_assert_state_consistent+0x1e/0x40
[   22.164327]  do_syscall_64+0x3b/0x90
[   22.164327]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   22.164327] RIP: 0033:0x7f42b4118443
[   22.164327] Code: 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 89 fa be 69 19 12 28 bf ad de e1 fe b8 a9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 8b 15 f9 c9 0d 00 f7 d8
[   22.164327] RSP: 002b:00007ffccf375768 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9
[   22.164327] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f42b4118443
[   22.164327] RDX: 000000004321fedc RSI: 0000000028121969 RDI: 00000000fee1dead
[   22.164327] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffccf374b70
[   22.164327] R10: 00007f42b36547f0 R11: 0000000000000202 R12: 0000557af0fd649f
[   22.164327] R13: 0000000000000000 R14: 0000000000000000 R15: 0000557af0fd612a
[   22.164327]  </TASK>
[   22.164327] Kernel Offset: 0x2d800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[   22.164327] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000 ]---


View attachment "config.x86" of type "text/plain" (256548 bytes)

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