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Date: Thu, 11 Jan 2024 19:20:02 +1100
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To: regressions@lists.linux.dev
Cc: kernel@gentoo.org, stable@vger.kernel.org, linux-nfs@vger.kernel.org
Subject: [REGRESSION] After kernel upgrade 6.1.70 to 6.1.71, the computer
 hangs during shutdown
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#regzbot introduced: v6.1.70..v6.1.71


After kernel upgrade 6.1.70 to 6.1.71, the computer hangs during shutdown.

The problem is related to NFS service. Stopping NFS service hangs:

# /etc/init.d/nfs  stop
  * Caching service dependencies ... [ ok ]
  * Stopping NFS mountd ... [ ok ]
  * Stopping NFS daemon ... [ ok ]

then it hangs


Shutdown does not hang when NFS service is removed.

# rc-update  del  nfs

I had this kernel error in the log:

Jan 10 17:32:25 [rpc.mountd] Caught signal 15, un-registering and exiting.
Jan 10 17:32:25 [kernel] [ 2005.560991] ------------[ cut here ]------------
Jan 10 17:32:25 [kernel] [ 2005.560996] kernel BUG at net/sunrpc/svc.c:576!
Jan 10 17:32:25 [kernel] [ 2005.561004] invalid opcode: 0000 [#1] 
PREEMPT SMP PTI
Jan 10 17:32:25 [kernel] [ 2005.561012] CPU: 0 PID: 8079 Comm: nfsd 
Tainted: P           O       6.1.71-gentoo #1
Jan 10 17:32:25 [kernel] [ 2005.561017] Hardware name: Gigabyte 
Technology Co., Ltd. X58A-UD3R/X58A-UD3R, BIOS FB 08/24/2010
Jan 10 17:32:25 [kernel] [ 2005.561020] RIP: 0010:svc_destroy+0x1f/0x56
Jan 10 17:32:25 [kernel] [ 2005.561033] Code: 5b 5d 41 5c 41 5d c3 cc cc 
cc cc 55 48 8d 6f ec 53 48 89 fb 48 83 c7 44 e8 b6 6c 5f ff 48 8b 53 1c 
48 8d 43 1c 48 39 c2 74 02 <0f> 0b 48 8b 53 2c 48 8d 43 2c 48 39 c2 74 
02 0f 0b 48 89 ef e8 6b
Jan 10 17:32:25 [kernel] [ 2005.561038] RSP: 0018:ffffc90001edbee8 
EFLAGS: 00010287
Jan 10 17:32:25 [kernel] [ 2005.561043] RAX: ffff88816c1a1c30 RBX: 
ffff88816c1a1c14 RCX: 0000000000000000
Jan 10 17:32:25 [kernel] [ 2005.561047] RDX: ffff88813dfcc018 RSI: 
0000000000000286 RDI: ffff88890bc9b9c0
Jan 10 17:32:25 [kernel] [ 2005.561051] RBP: ffff88816c1a1c00 R08: 
ffff88810310b600 R09: 0000000000000000
Jan 10 17:32:25 [kernel] [ 2005.561055] R10: ffff8881bc3b4000 R11: 
ffff8881bc3b4000 R12: ffffffff82e061c0
Jan 10 17:32:25 [kernel] [ 2005.561058] R13: ffff8881bc0e8000 R14: 
ffff88810310b600 R15: ffffc90002323c80
Jan 10 17:32:25 [kernel] [ 2005.561062] FS:  0000000000000000(0000) 
GS:ffff88890bc00000(0000) knlGS:0000000000000000
Jan 10 17:32:25 [kernel] [ 2005.561067] CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
Jan 10 17:32:25 [kernel] [ 2005.561071] CR2: 000055e971e376f8 CR3: 
000000000260a000 CR4: 00000000000006f0
Jan 10 17:32:25 [kernel] [ 2005.561075] Call Trace:
Jan 10 17:32:25 [kernel] [ 2005.561079]  <TASK>
Jan 10 17:32:25 [kernel] [ 2005.561082]  ? __die_body+0x15/0x57
Jan 10 17:32:25 [kernel] [ 2005.561091]  ? die+0x2b/0x44
Jan 10 17:32:25 [kernel] [ 2005.561097]  ? do_trap+0x76/0xf9
Jan 10 17:32:25 [kernel] [ 2005.561102]  ? svc_destroy+0x1f/0x56
Jan 10 17:32:25 [kernel] [ 2005.561108]  ? svc_destroy+0x1f/0x56
Jan 10 17:32:25 [kernel] [ 2005.561114]  ? do_error_trap+0x69/0x93
Jan 10 17:32:25 [kernel] [ 2005.561119]  ? svc_destroy+0x1f/0x56
Jan 10 17:32:25 [kernel] [ 2005.561126]  ? exc_invalid_op+0x49/0x5d
Jan 10 17:32:25 [kernel] [ 2005.561133]  ? svc_destroy+0x1f/0x56
Jan 10 17:32:25 [kernel] [ 2005.561139]  ? asm_exc_invalid_op+0x16/0x20
Jan 10 17:32:25 [kernel] [ 2005.561148]  ? svc_destroy+0x1f/0x56
Jan 10 17:32:25 [kernel] [ 2005.561155]  ? svc_destroy+0x12/0x56
Jan 10 17:32:25 [kernel] [ 2005.561161]  nfsd+0x13d/0x162
Jan 10 17:32:25 [kernel] [ 2005.561170]  ? svc_put+0x2f/0x2f
Jan 10 17:32:25 [kernel] [ 2005.561176]  kthread+0xd0/0xd8
Jan 10 17:32:25 [kernel] [ 2005.561183]  ? 
kthread_complete_and_exit+0x16/0x16
Jan 10 17:32:25 [kernel] [ 2005.561189]  ret_from_fork+0x22/0x30
Jan 10 17:32:25 [kernel] [ 2005.561196]  </TASK>
Jan 10 17:32:25 [kernel] [ 2005.561198] Modules linked in: snd_seq_dummy 
snd_seq snd_seq_device nvidia_uvm(PO) bluetooth ecdh_generic ecc bridge 
stp llc ipv6 crc_ccitt ch341 usbserial nvidia_drm(PO) nvidia_modeset(PO) 
nvidia(PO) tda10048 tda8290 iTCO_wdt iTCO_vendor_support tda18271 it87 
hwmon_vid dm_crypt coretemp dm_multipath dm_mod kvm_intel dax video 
snd_hda_codec_realtek snd_hda_codec_generic kvm drm_kms_helper irqbypass 
ledtrig_audio i2c_i801 pcspkr serio_raw drm i2c_smbus snd_hda_intel 
i2c_core snd_intel_dspcfg fb_sys_fops syscopyarea snd_hda_codec 
sysfillrect lpc_ich snd_hda_core sysimgblt mfd_core snd_hwdep uhci_hcd 
rtc_cmos wmi
Jan 10 17:32:25 [kernel] [ 2005.561274] ---[ end trace 0000000000000000 ]---
Jan 10 17:32:25 [kernel] [ 2005.561277] RIP: 0010:svc_destroy+0x1f/0x56
Jan 10 17:32:25 [kernel] [ 2005.561284] Code: 5b 5d 41 5c 41 5d c3 cc cc 
cc cc 55 48 8d 6f ec 53 48 89 fb 48 83 c7 44 e8 b6 6c 5f ff 48 8b 53 1c 
48 8d 43 1c 48 39 c2 74 02 <0f> 0b 48 8b 53 2c 48 8d 43 2c 48 39 c2 74 
02 0f 0b 48 89 ef e8 6b

The problem is always reproducible. Steps to reproduce:
1. Update to kernel 6.1.71
2. Start nfs service
3. Try to shutdown
4. The computer hangs

Reverting the following 3 commits fixed the problem in kernel 6.1.71:

f9a01938e07910224d4a2fd00583725d686c3f38
bb4f791cb2de1140d0fbcedfe9e791ff364021d7
03d68ffc48b94cc1e15bbf3b4f16f1e1e4fa286a