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Date: Wed, 23 Jun 2021 22:35:50 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Kees Cook <keescook@...omium.org>
Cc: 0day robot <lkp@...el.com>,
Guillaume Tucker <guillaume.tucker@...labora.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
Shuah Khan <shuah@...nel.org>,
Kees Cook <keescook@...omium.org>, stable@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: [selftests/lkdtm] 84d8cf25b0:
kernel_BUG_at_drivers/misc/lkdtm/bugs.c
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: 84d8cf25b0f80da0ac229214864654a7662ec7e4 ("[PATCH v2] selftests/lkdtm: Use /bin/sh not $SHELL")
url: https://github.com/0day-ci/linux/commits/Kees-Cook/selftests-lkdtm-Use-bin-sh-not-SHELL/20210619-105959
base: https://git.kernel.org/cgit/linux/kernel/git/shuah/linux-kselftest.git next
in testcase: kernel-selftests
version: kernel-selftests-x86_64-f8879e85-1_20210618
with following parameters:
group: lkdtm
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: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz 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>
[ 51.725186] kernel BUG at drivers/misc/lkdtm/bugs.c:76!
[ 51.730568] invalid opcode: 0000 [#1] PREEMPT SMP PTI
[ 51.735672] CPU: 0 PID: 1427 Comm: cat Not tainted 5.13.0-rc2-00011-g84d8cf25b0f8 #1
[ 51.743465] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.8.1 12/05/2017
[ 51.750909] RIP: 0010:lkdtm_BUG (kbuild/src/consumer/drivers/misc/lkdtm/bugs.c:76)
[ 51.754859] Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00
All code
========
0: cc int3
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: cc int3
6: cc int3
7: cc int3
8: cc int3
9: cc int3
a: cc int3
b: cc int3
c: cc int3
d: cc int3
e: cc int3
f: cc int3
10: cc int3
11: cc int3
12: cc int3
13: cc int3
14: cc int3
15: cc int3
16: cc int3
17: cc int3
18: cc int3
19: cc int3
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: cc int3
1f: cc int3
20: cc int3
21: cc int3
22: cc int3
23: cc int3
24: cc int3
25: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
2a:* 0f 0b ud2 <-- trapping instruction
2c: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
33: 00 00 00 00
37: 66 data16
38: 66 data16
39: 2e cs
3a: 0f .byte 0xf
3b: 1f (bad)
3c: 84 00 test %al,(%rax)
...
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
9: 00 00 00 00
d: 66 data16
e: 66 data16
f: 2e cs
10: 0f .byte 0xf
11: 1f (bad)
12: 84 00 test %al,(%rax)
...
[ 51.773751] RSP: 0018:ffffc900011c3e58 EFLAGS: 00010282
[ 51.779007] RAX: ffffffff81992280 RBX: 0000000000000001 RCX: 0000000000000000
[ 51.786188] RDX: 0000000000000000 RSI: ffffffff8122f88f RDI: ffffffff824c3f30
[ 51.793384] RBP: ffff888812085000 R08: 0000000000000001 R09: 0000000000000001
[ 51.800566] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000004
[ 51.807746] R13: ffffc900011c3f08 R14: ffffffff828b9198 R15: ffff8881026a74b8
[ 51.814924] FS: 00007f20e7a9b540(0000) GS:ffff88881dc00000(0000) knlGS:0000000000000000
[ 51.823068] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 51.828850] CR2: 00007f20e7711000 CR3: 0000000812094006 CR4: 00000000003706f0
[ 51.836030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 51.843213] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 51.850396] Call Trace:
[ 51.852857] direct_entry.cold (kbuild/src/consumer/drivers/misc/lkdtm/core.c:397)
[ 51.856806] full_proxy_write (kbuild/src/consumer/fs/debugfs/file.c:234)
[ 51.860668] vfs_write (kbuild/src/consumer/fs/read_write.c:603)
[ 51.864004] ksys_write (kbuild/src/consumer/fs/read_write.c:658)
[ 51.867435] do_syscall_64 (kbuild/src/consumer/arch/x86/entry/common.c:47)
[ 51.871035] entry_SYSCALL_64_after_hwframe (kbuild/src/consumer/arch/x86/entry/entry_64.S:112)
[ 51.876122] RIP: 0033:0x7f20e79c3504
[ 51.879720] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 48 8d 05 f9 61 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53
All code
========
0: 00 f7 add %dh,%bh
2: d8 64 89 02 fsubs 0x2(%rcx,%rcx,4)
6: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax
d: eb b3 jmp 0xffffffffffffffc2
f: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
16: 48 8d 05 f9 61 0d 00 lea 0xd61f9(%rip),%rax # 0xd6216
1d: 8b 00 mov (%rax),%eax
1f: 85 c0 test %eax,%eax
21: 75 13 jne 0x36
23: b8 01 00 00 00 mov $0x1,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 retq
33: 0f 1f 00 nopl (%rax)
36: 41 54 push %r12
38: 49 89 d4 mov %rdx,%r12
3b: 55 push %rbp
3c: 48 89 f5 mov %rsi,%rbp
3f: 53 push %rbx
Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 retq
9: 0f 1f 00 nopl (%rax)
c: 41 54 push %r12
e: 49 89 d4 mov %rdx,%r12
11: 55 push %rbp
12: 48 89 f5 mov %rsi,%rbp
15: 53 push %rbx
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 split-job --compatible job.yaml # generate the yaml file for lkp run
bin/lkp run generated-yaml-file
---
0DAY/LKP+ Test Infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation
Thanks,
Oliver Sang
View attachment "config-5.13.0-rc2-00011-g84d8cf25b0f8" of type "text/plain" (175421 bytes)
View attachment "job-script" of type "text/plain" (6111 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (22124 bytes)
View attachment "job.yaml" of type "text/plain" (4876 bytes)
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