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Date: Tue, 27 Feb 2018 11:02:34 +0800
From: kernel test robot <fengguang.wu@...el.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: David Miller <davem@...emloft.net>, hkallweit1@...il.com,
Florian Fainelli <f.fainelli@...il.com>,
netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
lkp@...org
Subject: [net] cb0789fd8b: INFO:task_blocked_for_more_than#seconds
FYI, we noticed the following commit (built with gcc-6):
commit: cb0789fd8b03b59948257b67531d0b5fd87061c5 ("net: phy: Restore phy_resume() locking assumption")
url: https://github.com/0day-ci/linux/commits/Andrew-Lunn/net-phy-Restore-phy_resume-locking-assumption/20180226-220932
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -m 420M
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+--------------------------------------------------+------------+------------+
| | a5f7add332 | cb0789fd8b |
+--------------------------------------------------+------------+------------+
| boot_successes | 10 | 0 |
| boot_failures | 0 | 14 |
| INFO:task_blocked_for_more_than#seconds | 0 | 12 |
| Kernel_panic-not_syncing:hung_task:blocked_tasks | 0 | 12 |
| BUG:kernel_hang_in_boot_stage | 0 | 2 |
| RIP:ring_buffer_lock_reserve | 0 | 1 |
| RIP:__sanitizer_cov_trace_pc | 0 | 1 |
+--------------------------------------------------+------------+------------+
[ 246.754333] INFO: task swapper/0:1 blocked for more than 120 seconds.
[ 246.755305] Not tainted 4.16.0-rc2-00146-gcb0789f #2
[ 246.756204] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 246.757066] swapper/0 D13040 1 0 0x80000000
[ 246.757638] Call Trace:
[ 246.757891] ? __schedule+0x611/0x730
[ 246.758301] ? __clear_rsb+0x15/0x3d
[ 246.758719] ? __clear_rsb+0x15/0x3d
[ 246.759103] ? schedule+0x8c/0xa0
[ 246.759475] ? schedule_timeout+0x44/0x48b
[ 246.759886] ? trace_preempt_on+0x16/0x15f
[ 246.760359] ? wait_for_common+0x1a6/0x1d8
[ 246.760805] ? do_task_dead+0x4f/0x4f
[ 246.761222] ? flush_work+0x19d/0x1d7
[ 246.761635] ? flush_workqueue_prep_pwqs+0x13b/0x13b
[ 246.762161] ? driver_deferred_probe_trigger+0xaf/0xaf
[ 246.762880] ? do_early_param+0xbe/0xbe
[ 246.763542] ? deferred_probe_initcall+0x22/0x2c
[ 246.764233] ? do_one_initcall+0xaf/0x191
[ 246.764671] ? do_early_param+0xbe/0xbe
[ 246.765080] ? kernel_init_freeable+0x129/0x1de
[ 246.765564] ? rest_init+0xc4/0xc4
[ 246.765909] ? kernel_init+0x10/0x142
[ 246.766305] ? rest_init+0xc4/0xc4
[ 246.766681] ? ret_from_fork+0x3a/0x50
[ 246.767075] NMI backtrace for cpu 0
[ 246.767504] CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.16.0-rc2-00146-gcb0789f #2
[ 246.768735] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 246.770035] Call Trace:
[ 246.770480] ? dump_stack+0xb0/0x102
[ 246.771055] ? nmi_cpu_backtrace+0xde/0x117
[ 246.771551] ? lapic_can_unplug_cpu+0x91/0x91
[ 246.771983] ? nmi_trigger_cpumask_backtrace+0xe2/0x1ae
[ 246.772535] ? watchdog+0x366/0x412
[ 246.772884] ? preempt_count_sub+0x44/0x52
[ 246.773308] ? hung_task_panic+0x17/0x17
[ 246.773711] ? kthread+0x13b/0x14a
[ 246.774062] ? kthread_delayed_work_timer_fn+0xb3/0xb3
[ 246.774587] ? ret_from_fork+0x3a/0x50
[ 246.775000] Kernel panic - not syncing: hung_task: blocked tasks
[ 246.775629] CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.16.0-rc2-00146-gcb0789f #2
[ 246.776398] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 246.777209] Call Trace:
[ 246.777473] ? dump_stack+0xb0/0x102
[ 246.777826] ? panic+0x10f/0x2bf
[ 246.778168] ? watchdog+0x366/0x412
[ 246.778529] ? watchdog+0x372/0x412
[ 246.778879] ? preempt_count_sub+0x44/0x52
[ 246.779302] ? hung_task_panic+0x17/0x17
[ 246.779706] ? kthread+0x13b/0x14a
[ 246.780056] ? kthread_delayed_work_timer_fn+0xb3/0xb3
[ 246.780576] ? ret_from_fork+0x3a/0x50
[ 246.781156] Kernel Offset: disabled
Elapsed time: 250
#!/bin/bash
# To reproduce,
# 1) save job-script and this script (both are attached in 0day report email)
# 2) run this script with your compiled kernel and optional env $INSTALL_MOD_PATH
kernel=$1
initrds=(
/osimage/yocto/yocto-tiny-i386-2016-04-22.cgz
/lkp/lkp/lkp-i386.cgz
/osimage/deps/debian-x86_64-2016-08-31.cgz/run-ipconfig.i386_2016-09-03.cgz
)
HTTP_PREFIX=https://github.com/0day-ci/lkp-qemu/raw/master
wget --timestamping "${initrds[@]/#/$HTTP_PREFIX}"
{
cat "${initrds[@]//*\//}"
[[ $INSTALL_MOD_PATH ]] && (
cd "$INSTALL_MOD_PATH"
find lib | cpio -o -H newc --quiet | gzip
)
echo job-script | cpio -o -H newc --quiet | gzip
} > initrd.img
kvm=(
qemu-system-x86_64
-enable-kvm
-kernel $kernel
-initrd initrd.img
-m 420
-smp 1
-device e1000,netdev=net0
-netdev user,id=net0
-boot order=nc
-no-reboot
-watchdog i6300esb
-watchdog-action debug
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
Thanks,
lkp
View attachment "config-4.16.0-rc2-00146-gcb0789f" of type "text/plain" (146678 bytes)
View attachment "job-script" of type "text/plain" (4136 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (16548 bytes)
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