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Message-ID: <20210118140549.GA13235@xsang-OptiPlex-9020>
Date: Mon, 18 Jan 2021 22:06:01 +0800
From: kernel test robot <oliver.sang@...el.com>
To: David Woodhouse <dwmw2@...radead.org>
Cc: 0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
lkp@...ts.01.org, kvm@...r.kernel.org,
Paolo Bonzini <pbonzini@...hat.com>,
Ankur Arora <ankur.a.arora@...cle.com>,
Joao Martins <joao.m.martins@...cle.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Sean Christopherson <seanjc@...gle.com>, graf@...zon.com,
iaslan@...zon.de, pdurrant@...zon.com, aagch@...zon.com,
fandree@...zon.com, hch@...radead.org
Subject: [KVM] 19b4a47436: WARNING:suspicious_RCU_usage
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: 19b4a474364435a929b1e377a290636cba89cebd ("KVM: x86: declare Xen HVM shared info capability and add test case")
url: https://github.com/0day-ci/linux/commits/David-Woodhouse/KVM-Add-minimal-support-for-Xen-HVM-guests/20210112-040054
in testcase: kernel-selftests
version: kernel-selftests-x86_64-cb0debfe-1_20201231
with following parameters:
group: kvm
ucode: 0xe2
test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
on test machine: 8 threads Intel(R) Core(TM) i7-6770HQ CPU @ 2.60GHz with 32G memory
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 98.013319] WARNING: suspicious RCU usage
[ 98.017738] 5.11.0-rc3-g19b4a4743644 #1 Tainted: G W I
[ 98.024397] -----------------------------
[ 98.028742] include/linux/kvm_host.h:641 suspicious rcu_dereference_check() usage!
[ 98.036741]
[ 98.036741] other info that might help us debug this:
[ 98.036741]
[ 98.045216]
[ 98.045216] rcu_scheduler_active = 2, debug_locks = 1
[ 98.052156] no locks held by xen_shinfo_test/10670.
[ 98.057387]
[ 98.057387] stack backtrace:
[ 98.062104] CPU: 4 PID: 10670 Comm: xen_shinfo_test Tainted: G W I 5.11.0-rc3-g19b4a4743644 #1
[ 98.072421] Hardware name: /NUC6i7KYB, BIOS KYSKLi70.86A.0041.2016.0817.1130 08/17/2016
[ 98.080909] Call Trace:
[ 98.083465] dump_stack (kbuild/src/consumer/lib/dump_stack.c:122)
[ 98.086928] kvm_gfn_to_hva_cache_init (kbuild/src/consumer/include/linux/kvm_host.h:641 kbuild/src/consumer/include/linux/kvm_host.h:638 kbuild/src/consumer/include/linux/kvm_host.h:648 kbuild/src/consumer/arch/x86/kvm/../../../virt/kvm/kvm_main.c:2557)
[ 98.091791] kvm_xen_hvm_set_attr (kbuild/src/consumer/arch/x86/kvm/xen.c:28 kbuild/src/consumer/arch/x86/kvm/xen.c:194)
[ 98.096277] kvm_arch_vm_ioctl (kbuild/src/consumer/arch/x86/kvm/x86.c:5664)
[ 98.100577] ? preempt_count_sub (kbuild/src/consumer/kernel/sched/core.c:4737 kbuild/src/consumer/kernel/sched/core.c:4734 kbuild/src/consumer/kernel/sched/core.c:4756)
[ 98.104948] ? _raw_spin_unlock (kbuild/src/consumer/arch/x86/include/asm/preempt.h:102 kbuild/src/consumer/include/linux/spinlock_api_smp.h:152 kbuild/src/consumer/kernel/locking/spinlock.c:183)
[ 98.109145] ? do_fault (kbuild/src/consumer/mm/memory.c:3998 kbuild/src/consumer/mm/memory.c:4014 kbuild/src/consumer/mm/memory.c:4147)
[ 98.112910] kvm_vm_ioctl (kbuild/src/consumer/arch/x86/kvm/../../../virt/kvm/kvm_main.c:3977)
[ 98.116783] ? find_held_lock (kbuild/src/consumer/kernel/locking/lockdep.c:4935)
[ 98.120799] __x64_sys_ioctl (kbuild/src/consumer/fs/ioctl.c:49 kbuild/src/consumer/fs/ioctl.c:753 kbuild/src/consumer/fs/ioctl.c:739 kbuild/src/consumer/fs/ioctl.c:739)
[ 98.124720] do_syscall_64 (kbuild/src/consumer/arch/x86/entry/common.c:46)
[ 98.128455] entry_SYSCALL_64_after_hwframe (kbuild/src/consumer/arch/x86/entry/entry_64.S:127)
[ 98.133804] RIP: 0033:0x7f2b026d9427
[ 98.137579] Code: 00 00 90 48 8b 05 69 aa 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 39 aa 0c 00 f7 d8 64 89 01 48
All code
========
0: 00 00 add %al,(%rax)
2: 90 nop
3: 48 8b 05 69 aa 0c 00 mov 0xcaa69(%rip),%rax # 0xcaa73
a: 64 c7 00 26 00 00 00 movl $0x26,%fs:(%rax)
11: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax
18: c3 retq
19: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
20: 00 00 00
23: b8 10 00 00 00 mov $0x10,%eax
28: 0f 05 syscall
2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
30: 73 01 jae 0x33
32: c3 retq
33: 48 8b 0d 39 aa 0c 00 mov 0xcaa39(%rip),%rcx # 0xcaa73
3a: f7 d8 neg %eax
3c: 64 89 01 mov %eax,%fs:(%rcx)
3f: 48 rex.W
Code starting with the faulting instruction
===========================================
0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax
6: 73 01 jae 0x9
8: c3 retq
9: 48 8b 0d 39 aa 0c 00 mov 0xcaa39(%rip),%rcx # 0xcaa49
10: f7 d8 neg %eax
12: 64 89 01 mov %eax,%fs:(%rcx)
15: 48 rex.W
[ 98.157411] RSP: 002b:00007ffdab1fda68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 98.165374] RAX: ffffffffffffffda RBX: 000000004028aec9 RCX: 00007f2b026d9427
[ 98.172912] RDX: 00007ffdab1fdad0 RSI: 000000004028aec9 RDI: 0000000000000006
[ 98.180388] RBP: 0000000000000004 R08: 000000000040bf70 R09: 000000004028aec9
[ 98.187919] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401840
[ 98.195359] R13: 00007ffdab1fdce0 R14: 0000000000000000 R15: 0000000000000000
[ 106.803873] gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread -no-pie x86_64/cr4_cpuid_sync_test.c /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-19b4a474364435a929b1e377a290636cba89cebd/tools/testing/selftests/kvm/libkvm.a -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-19b4a474364435a929b1e377a290636cba89cebd/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test
[ 106.803882]
[ 121.988033] gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread -no-pie x86_64/evmcs_test.c /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-19b4a474364435a929b1e377a290636cba89cebd/tools/testing/selftests/kvm/libkvm.a -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-19b4a474364435a929b1e377a290636cba89cebd/tools/testing/selftests/kvm/x86_64/evmcs_test
[ 121.988042]
[ 136.292354] gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread -no-pie x86_64/hyperv_cpuid.c /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-19b4a474364435a929b1e377a290636cba89cebd/tools/testing/selftests/kvm/libkvm.a -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-19b4a474364435a929b1e377a290636cba89cebd/tools/testing/selftests/kvm/x86_64/hyperv_cpuid
[ 136.292364]
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
Thanks,
Oliver Sang
View attachment "config-5.11.0-rc3-g19b4a4743644" of type "text/plain" (212584 bytes)
View attachment "job-script" of type "text/plain" (5953 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (17968 bytes)
View attachment "kernel-selftests" of type "text/plain" (74906 bytes)
View attachment "job.yaml" of type "text/plain" (4913 bytes)
View attachment "reproduce" of type "text/plain" (134 bytes)
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