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Date: Fri, 22 Jan 2021 16:13:11 +0800
From: kernel test robot <oliver.sang@...el.com>
To: John Ogness <john.ogness@...utronix.de>
Cc: Petr Mladek <pmladek@...e.com>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com, zhengjun.xing@...ux.intel.com
Subject: [printk] b031a684bf: INFO:rcu_tasks_detected_stalls_on_tasks
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: b031a684bfd01d633c79d281bd0cf11c2f834ada ("printk: remove logbuf_lock writer-protection of ringbuffer")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
in testcase: rcutorture
version:
with following parameters:
runtime: 300s
test: cpuhotplug
torture_type: tasks
test-description: rcutorture is rcutorture kernel module load/unload test.
test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt
on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+------------------------------------------------+------------+------------+
| | 6b916706f8 | b031a684bf |
+------------------------------------------------+------------+------------+
| boot_successes | 66 | 18 |
| boot_failures | 2 | 26 |
| INFO:rcu_sched_detected_stalls_on_CPUs/tasks | 1 | |
| RIP:enqueue_hrtimer | 1 | |
| RIP:__memset | 1 | |
| RIP:clear_page_rep | 2 | 2 |
| BUG:kernel_hang_in_boot_stage | 2 | |
| INFO:rcu_sched_self-detected_stall_on_CPU | 1 | 4 |
| INFO:rcu_tasks_detected_stalls_on_tasks | 0 | 22 |
| RIP:kernel_init_free_pages | 0 | 1 |
| IP-Config:Auto-configuration_of_network_failed | 0 | 3 |
| RIP:zone_page_state | 0 | 1 |
+------------------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 952.147986] INFO: rcu_tasks detected stalls on tasks:
[ 952.149313] 000000008d44d6d1: .. nvcsw: 0/0 holdout: 1 idle_cpu: -1/1
[ 952.150866] task:dmesg state:R running task stack: 0 pid: 1771 ppid: 573 flags:0x20020000
[ 952.153385] Call Trace:
[ 952.154090] __schedule (kbuild/src/consumer/kernel/sched/core.c:3779 kbuild/src/consumer/kernel/sched/core.c:4528)
[ 952.154990] ? firmware_map_remove (kbuild/src/consumer/kernel/sched/core.c:4411)
[ 952.156159] ? ksys_read (kbuild/src/consumer/fs/read_write.c:637)
[ 952.157063] schedule (kbuild/src/consumer/include/linux/thread_info.h:84 (discriminator 1) kbuild/src/consumer/include/linux/sched.h:1897 (discriminator 1) kbuild/src/consumer/kernel/sched/core.c:4608 (discriminator 1))
[ 952.157895] exit_to_user_mode_prepare (kbuild/src/consumer/kernel/entry/common.c:160 kbuild/src/consumer/kernel/entry/common.c:191)
[ 952.158984] syscall_exit_to_user_mode (kbuild/src/consumer/arch/x86/include/asm/jump_label.h:41 kbuild/src/consumer/arch/x86/include/asm/nospec-branch.h:288 kbuild/src/consumer/arch/x86/include/asm/entry-common.h:80 kbuild/src/consumer/kernel/entry/common.c:133 kbuild/src/consumer/kernel/entry/common.c:268)
[ 952.160252] entry_INT80_compat (kbuild/src/consumer/arch/x86/entry/entry_64_compat.S:412)
[ 952.161424] RIP: 0023:0xf7eeca02
[ 952.162254] RSP: 002b:00000000fff98e04 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[ 952.164203] RAX: ffffffffffffffe0 RBX: 0000000000000004 RCX: 0000000056573234
[ 952.165898] RDX: 0000000000001fff RSI: 00000000000001e0 RDI: 0000000056573234
[ 952.167484] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
[ 952.169182] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 952.170897] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 952.189825] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.191987]
[ 352.522192] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.192011]
[ 952.222122] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.224619]
[ 352.539354]
[ 98.566609] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.224648]
[ 952.264449]
[ 352.555366] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.264484]
[ 952.267017] 00000000974cbae1: .. nvcsw: 2/2 holdout: 1 idle_cpu: -1/1
[ 952.268469] task:sed state:R running task stack: 0 pid: 424 ppid: 396 flags:0x20020000
[ 952.270501] Call Trace:
[ 952.270986] __schedule (kbuild/src/consumer/kernel/sched/core.c:3779 kbuild/src/consumer/kernel/sched/core.c:4528)
[ 952.271861] ? firmware_map_remove (kbuild/src/consumer/kernel/sched/core.c:4411)
[ 952.272870] ? ksys_write (kbuild/src/consumer/fs/read_write.c:661)
[ 952.273709] schedule (kbuild/src/consumer/include/linux/thread_info.h:84 (discriminator 1) kbuild/src/consumer/include/linux/sched.h:1897 (discriminator 1) kbuild/src/consumer/kernel/sched/core.c:4608 (discriminator 1))
[ 952.274495] exit_to_user_mode_prepare (kbuild/src/consumer/kernel/entry/common.c:160 kbuild/src/consumer/kernel/entry/common.c:191)
[ 952.275516] syscall_exit_to_user_mode (kbuild/src/consumer/arch/x86/include/asm/jump_label.h:41 kbuild/src/consumer/arch/x86/include/asm/nospec-branch.h:288 kbuild/src/consumer/arch/x86/include/asm/entry-common.h:80 kbuild/src/consumer/kernel/entry/common.c:133 kbuild/src/consumer/kernel/entry/common.c:268)
[ 952.276650] entry_INT80_compat (kbuild/src/consumer/arch/x86/entry/entry_64_compat.S:412)
[ 952.277673] RIP: 0023:0xf7f93a02
[ 952.278497] RSP: 002b:00000000ff8db2f4 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
[ 952.280235] RAX: 0000000000000001 RBX: 0000000000000001 RCX: 000000005666f220
[ 952.281813] RDX: 0000000000000001 RSI: 00000000f7f59d60 RDI: 0000000000000001
[ 952.283347] RBP: 000000005666f220 R08: 0000000000000000 R09: 0000000000000000
[ 952.284919] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 952.286507] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 952.294673] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.328047] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.336658]
[ 352.572231]
[ 98.585525] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.336693]
[ 952.359450]
[ 352.594642] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.359483]
[ 952.377678] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.409955] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.412504]
[ 352.610470]
[ 98.605699] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.412531]
[ 952.444293]
[ 352.625170] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.444328]
[ 952.453669] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.480340]
[ 352.638172]
[ 98.622917] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.480372]
[ 952.521255] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.532279]
[ 352.668363] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.532313]
[ 952.546877] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.589718]
[ 352.679476]
[ 98.638686] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.589794]
[ 952.604011] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.622613]
[ 352.694706] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.622648]
[ 952.631723] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.662230]
[ 352.706582]
[ 98.654747] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.662270]
[ 952.692429] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.700017]
[ 352.738289] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.700056]
[ 952.732376] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.762275] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.764584]
[ 352.740552]
[ 98.670545] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.764616]
[ 952.809608] tasks-torture:torture_onoff task: online 0 failed: errno -5
[ 952.811420]
[ 352.764442]
To reproduce:
# build kernel
cd linux
cp config-5.10.0-rc5-gb031a684bfd0 .config
make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage
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,
Oliver Sang
View attachment "config-5.10.0-rc5-gb031a684bfd0" of type "text/plain" (120657 bytes)
View attachment "job-script" of type "text/plain" (4359 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (393380 bytes)
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