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Date: Tue, 12 Jan 2021 21:59:25 +0800
From: kernel test robot <oliver.sang@...el.com>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Linux Memory Management List <linux-mm@...ck.org>,
lkp@...ts.01.org, lkp@...el.com
Subject: [torture] 6e9c2c547d:
WARNING:at_kernel/sched/core.c:#__set_cpus_allowed_ptr
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: 6e9c2c547d9b5182bf130102597f01d1fda28b1d ("torture: Break affinity of kthreads last running on outgoing CPU")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.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-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+--------------------------------------------------------+------------+------------+
| | 1afb95fee0 | 6e9c2c547d |
+--------------------------------------------------------+------------+------------+
| boot_failures | 0 | 24 |
| WARNING:at_kernel/sched/core.c:#__set_cpus_allowed_ptr | 0 | 24 |
| EIP:__set_cpus_allowed_ptr | 0 | 24 |
| WARNING:possible_circular_locking_dependency_detected | 0 | 24 |
+--------------------------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 79.243453] WARNING: CPU: 0 PID: 552 at kernel/sched/core.c:2379 __set_cpus_allowed_ptr (kbuild/src/consumer/kernel/sched/core.c:2379)
[ 79.244313] Modules linked in: rcutorture torture
[ 79.244768] CPU: 0 PID: 552 Comm: torture_shuffle Not tainted 5.11.0-rc1-00026-g6e9c2c547d9b #1
[ 79.245581] EIP: __set_cpus_allowed_ptr (kbuild/src/consumer/kernel/sched/core.c:2379)
[ 79.246063] Code: 1a 20 74 28 8b 45 e4 8b 15 60 96 d8 42 8b 00 21 c2 84 d2 74 17 8b 15 58 96 d8 42 21 d0 84 c0 75 0b 83 bb d0 02 00 00 01 74 02 <0f> 0b 8b 45 e0 8d 4d e8 89 da 89 7c 24 04 89 04 24 89 f0 e8 d8 f8
All code
========
0: 1a 20 sbb (%rax),%ah
2: 74 28 je 0x2c
4: 8b 45 e4 mov -0x1c(%rbp),%eax
7: 8b 15 60 96 d8 42 mov 0x42d89660(%rip),%edx # 0x42d8966d
d: 8b 00 mov (%rax),%eax
f: 21 c2 and %eax,%edx
11: 84 d2 test %dl,%dl
13: 74 17 je 0x2c
15: 8b 15 58 96 d8 42 mov 0x42d89658(%rip),%edx # 0x42d89673
1b: 21 d0 and %edx,%eax
1d: 84 c0 test %al,%al
1f: 75 0b jne 0x2c
21: 83 bb d0 02 00 00 01 cmpl $0x1,0x2d0(%rbx)
28: 74 02 je 0x2c
2a:* 0f 0b ud2 <-- trapping instruction
2c: 8b 45 e0 mov -0x20(%rbp),%eax
2f: 8d 4d e8 lea -0x18(%rbp),%ecx
32: 89 da mov %ebx,%edx
34: 89 7c 24 04 mov %edi,0x4(%rsp)
38: 89 04 24 mov %eax,(%rsp)
3b: 89 f0 mov %esi,%eax
3d: e8 .byte 0xe8
3e: d8 f8 fdivr %st(0),%st
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 8b 45 e0 mov -0x20(%rbp),%eax
5: 8d 4d e8 lea -0x18(%rbp),%ecx
8: 89 da mov %ebx,%edx
a: 89 7c 24 04 mov %edi,0x4(%rsp)
e: 89 04 24 mov %eax,(%rsp)
11: 89 f0 mov %esi,%eax
13: e8 .byte 0xe8
14: d8 f8 fdivr %st(0),%st
[ 79.247793] EAX: 00000000 EBX: be856180 ECX: 00000000 EDX: 00000001
[ 79.248390] ESI: d9b934c0 EDI: 00000000 EBP: be84bf6c ESP: be84bf44
[ 79.248983] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010006
[ 79.249623] CR0: 80050033 CR2: 00500cb8 CR3: 7fa80000 CR4: 000406b0
[ 79.250254] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 79.250844] DR6: fffe0ff0 DR7: 00000400
[ 79.251210] Call Trace:
[ 79.251455] set_cpus_allowed_ptr (kbuild/src/consumer/kernel/sched/core.c:2395)
[ 79.251858] torture_shuffle (kbuild/src/consumer/kernel/torture.c:557 kbuild/src/consumer/kernel/torture.c:572) torture
[ 79.252316] kthread (kbuild/src/consumer/kernel/kthread.c:292)
[ 79.252634] ? torture_shutdown (kbuild/src/consumer/kernel/torture.c:568) torture
[ 79.253120] ? kthread_create_worker_on_cpu (kbuild/src/consumer/kernel/kthread.c:245)
[ 79.253609] ret_from_fork (kbuild/src/consumer/arch/x86/entry/entry_32.S:856)
[ 79.253997] irq event stamp: 884
[ 79.254310] hardirqs last enabled at (883): _raw_spin_unlock_irqrestore (kbuild/src/consumer/include/linux/spinlock_api_smp.h:160 kbuild/src/consumer/kernel/locking/spinlock.c:191)
[ 79.255131] hardirqs last disabled at (884): _raw_spin_lock_irqsave (kbuild/src/consumer/include/linux/spinlock_api_smp.h:108 kbuild/src/consumer/kernel/locking/spinlock.c:159)
[ 79.255907] softirqs last enabled at (44): __do_softirq (kbuild/src/consumer/arch/x86/include/asm/preempt.h:26 kbuild/src/consumer/kernel/softirq.c:371)
[ 79.256613] softirqs last disabled at (19): do_softirq_own_stack (kbuild/src/consumer/arch/x86/kernel/irq_32.c:59 kbuild/src/consumer/arch/x86/kernel/irq_32.c:148)
[ 79.257364] ---[ end trace ce7fa3e22353d187 ]---
[ 79.257851]
[ 79.257853] ======================================================
To reproduce:
# build kernel
cd linux
cp config-5.11.0-rc1-00026-g6e9c2c547d9b .config
make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 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-5.11.0-rc1-00026-g6e9c2c547d9b" of type "text/plain" (135891 bytes)
View attachment "job-script" of type "text/plain" (4427 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (160724 bytes)
View attachment "rcutorture" of type "text/plain" (4081 bytes)
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