Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.9-rc2/amd64/
Particularly,
commit b292b50b0efcc7095d8bf15505fba6909bb35dce
Author: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
Date: Mon Jul 13 11:12:54 2020 +0900
driver core: Fix probe_count imbalance in really_probe()
syzbot is reporting hung task in wait_for_device_probe() [1]. At least,
we always need to decrement probe_count if we incremented probe_count in
really_probe().
However, since I can't find "Resources present before probing" message in
the console log, both "this message simply flowed off" and "syzbot is not
hitting this path" will be possible. Therefore, while we are at it, let's
also prepare for concurrent wait_for_device_probe() calls by replacing
wake_up() with wake_up_all().
[1]
https://syzkaller.appspot.com/bug?id=25c833f1983c9c1d512f4ff860dd0d7f5a2e2c0f
Reported-by: syzbot <syzbot+805f5f6ae37411f15...@syzkaller.appspotmail.com>
Fixes: 7c35e699c88bd607 ("driver core: Print device when resources present
in really_probe()")
Cc: Geert Uytterhoeven <geert+rene...@glider.be>
Signed-off-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
Cc: stable <sta...@kernel.org>
Link:
https://lore.kernel.org/r/20200713021254.3444-1-penguin-ker...@i-love.sakura.ne.jp
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1886827
Title:
Machine hangs when doing a normal reboot
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hi,
When booting into kernel 4.15.0-99-generic or higher and also kernel
5.3.0-53-generic or higher, the system hangs when issuing the reboot
command or CTRL-ALT-DEL from console with the following console
messages:
---------- snip ------------
Reached target Final Step.
Starting Reboot...
< following message repeats indefinetely every 120 seconds >
INFO: task systemd-shutdow:1 blocked for more than 120 seconds.
Not tainted 4.15.0-99-generic #100
" echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
---------- snip ------------
I did a git bisect procedure between kernels 4.15.0-96-generic and 4.15.0-99
and it reported the following:
---------- snip ------------
b52be79f3c6cc89bb3834c5174843e34f945f386 is the first bad commit
commit b52be79f3c6cc89bb3834c5174843e34f945f386
---------- snip ------------
Ubuntu version affected:
Ubuntu 4.15.0-99.100-generic 4.15.18
First kernel package affected:
linux-image-4.15.0-99-generic
Necessary debug files will be attached as soon as possible.
Quinn
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 9 09:55 seq
crw-rw---- 1 root audio 116, 33 Jul 9 09:55 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord':
'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 18.04
HibernationDevice: RESUME=/dev/mapper/system-swap
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb:
Bus 001 Device 003: ID 0b38:0010 Gear Head 107-Key Keyboard
Bus 001 Device 002: ID 8087:07e6 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: To be filled by O.E.M. To be filled by O.E.M.
Package: linux (not installed)
PciMultimedia:
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-99-generic
root=/dev/mapper/system-root ro rootflags=subvol=@ biosdevname=0 net.ifnames=0
nomodeset "dyndbg=file drivers/base/* +p"
ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-99-generic N/A
linux-backports-modules-4.15.0-99-generic N/A
linux-firmware 1.173.18
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
Tags: bionic
Uname: Linux 4.15.0-99-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip disk plugdev sudo
_MarkForUpload: True
dmi.bios.date: 05/05/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5.6.5
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Aptio CRB
dmi.board.vendor: AMI Corporation
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr5.6.5:bd05/05/2016:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnAMICorporation:rnAptioCRB:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: To be filled by O.E.M.
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