** Also affects: linux-raspi (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-raspi (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux-raspi (Ubuntu Eoan)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1882213
Title:
cp file from external HDD to NFS on Pi 3B causes ubuntu 19.10 and
20.04 kernel to hang
Status in linux-raspi package in Ubuntu:
New
Status in linux-raspi source package in Eoan:
New
Status in linux-raspi source package in Focal:
New
Status in linux-raspi source package in Groovy:
New
Bug description:
Copying a large file using cp on my Raspberry Pi 3B (not 3B+) from an
externally-powered USB hard disk (Seagate Expansion 2TB) to an NFS-
mounted filesystem across Ethernet causes the kernel of releases 19.10
and 20.04 to hang/freeze.
This happens every time the copy is attempted, although the exact
duration from the start of the copy to the hang varies from a few
seconds to a couple of minutes. The kernel does not recover even after
long waits (30mins+), and a power reset (pulling the plug) is
required. (Although I admit I haven't tried yet simply disconnecting
the USB cable of the HDD during a hang. Update: I've now tried that -
the system doesn't recover after pulling the USB cable out.)
Likewise, messages are erratic and I suspect are only symptoms,
notably watchdog BUG soft lockup messages and RCU stall messages on
different CPU cores for different processes/threads. There are no
hardware messages that I've seen recorded in log files (or appearing
on the console) matching the incidents.
When a hang happen, network connectivity is lost - ssh sessions fail,
and the file copy stops (even when the cp is run on the console).
Pings to the system from other hosts on the same Ethernet LAN (and
switch) fail with destination host unreachable.
Although I have had a swapfile configured on the SD card, the hangs
continue to happen doing the cp after "swapoff -a". I've also tried
playing with taskset affinities and snappiness to no obvious effect -
the hangs still keep happening.
Copying from the external HDD to the SD card is successful, as is
copying from the SD card to the NFS.
Raspbian 4.19.0-8 (armmp-lpae) does not have this problem; it
successfully copies the file from HDD to NFS across Ethernet without
stalling.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-1011-raspi 5.4.0-1011.11
ProcVersionSignature: Ubuntu 5.4.0-1011.11-raspi 5.4.34
Uname: Linux 5.4.0-1011-raspi aarch64
ApportVersion: 2.20.11-0ubuntu27
Architecture: arm64
CasperMD5CheckResult: skip
Date: Fri Jun 5 07:37:44 2020
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: linux-raspi
UpgradeStatus: Upgraded to focal on 2020-05-21 (14 days ago)
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