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Date:   Fri, 18 Dec 2020 09:02:21 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org, Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>, mhiramat@...nel.org,
        "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        David Miller <davem@...emloft.net>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org
Subject: [x86/kprobes]  413d31338f: kernel_BUG_at_mm/vmalloc.c


Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 413d31338fca081133c508bcabc57854765f43df ("[PATCH 1/1] x86/kprobes: Do not decode opcode in resume_execution()")
url: https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/x86-kprobes-Classify-opcode-while-preparing-kprobe/20201206-221324
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 238c91115cd05c71447ea071624a4c9fe661f970

in testcase: trinity
version: trinity-static-i386-x86_64-f93256fb_2019-08-28
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


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):


+------------------------------------------+------------+------------+
|                                          | 238c91115c | 413d31338f |
+------------------------------------------+------------+------------+
| boot_successes                           | 8          | 0          |
| boot_failures                            | 0          | 8          |
| kernel_BUG_at_mm/vmalloc.c               | 0          | 8          |
| invalid_opcode:#[##]                     | 0          | 8          |
| EIP:vmalloc_to_page                      | 0          | 8          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 8          |
+------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>


[    8.468076] kernel BUG at mm/vmalloc.c:364!
[    8.468257] invalid opcode: 0000 [#1] PREEMPT SMP PTI
[    8.468344] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc7-00002-g413d31338fca08 #2
[    8.468344] EIP: vmalloc_to_page+0x27/0x107
[    8.468344] Code: 89 c8 c3 55 89 c2 89 c1 c1 e9 1e 89 e5 57 56 53 53 a1 64 06 cb c1 89 55 f0 8d 1c c8 89 d0 e8 9d ff ff ff 85 c0 8b 55 f0 75 02 <0f> 0b 8b 03 8b 4b 04 89 c6 81 e6 18 0e 00 00 74 02 0f 0b 89 c3 81
[    8.468344] EAX: 00000000 EBX: c1f6a000 ECX: 00000000 EDX: 00000000
[    8.468344] ESI: d087bda5 EDI: d087bda5 EBP: d087bce0 ESP: d087bcd0
[    8.468344] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010246
[    8.468344] CR0: 80050033 CR2: 00000000 CR3: 01f6a000 CR4: 000406b0
[    8.468344] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[    8.468344] DR6: fffe0ff0 DR7: 00000400
[    8.468344] Call Trace:
[    8.468344]  __text_poke+0x4c/0x28f
[    8.468344]  ? insn_get_displacement+0x1b/0xce
[    8.468344]  ? cmp_ex_sort+0x17/0x17
[    8.468344]  text_poke+0x35/0x3a
[    8.468344]  arch_copy_kprobe+0x12b/0x148
[    8.468344]  arch_prepare_kprobe+0x48/0x6a
[    8.468344]  register_kprobe+0x27f/0x374
[    8.468344]  __register_trace_kprobe+0x6e/0x73
[    8.468344]  register_trace_kprobe+0x140/0x282
[    8.468344]  ? traceprobe_set_print_fmt+0x40/0x58
[    8.468344]  trace_kprobe_create+0x33e/0x3c3
[    8.468344]  ? __kmalloc+0xc1/0xcd
[    8.468344]  ? argv_split+0x5b/0xb9
[    8.468344]  ? trace_kprobe_create+0x3c3/0x3c3
[    8.468344]  create_or_delete_trace_kprobe+0x1b/0x27
[    8.468344]  trace_run_command+0x48/0x6b
[    8.468344]  trace_kprobe_run_command+0xf/0x11
[    8.468344]  dynevent_create+0xb/0xd
[    8.468344]  kprobe_event_gen_test_init+0x82/0x1e2
[    8.468344]  ? kprobe_event_cmd_init+0x13/0x13
[    8.468344]  ? init_trace_printk+0xf/0xf
[    8.468344]  do_one_initcall+0xaa/0x1d4
[    8.468344]  ? rdinit_setup+0x21/0x21
[    8.468344]  ? trace_initcall_level+0x72/0x76
[    8.468344]  do_initcalls+0xa8/0xc8
[    8.468344]  kernel_init_freeable+0x94/0xb9
[    8.468344]  ? rest_init+0xce/0xce
[    8.468344]  kernel_init+0x8/0xe4
[    8.468344]  ret_from_fork+0x1c/0x28
[    8.468344] Modules linked in:
[    8.476471] ---[ end trace 543d3449d7fd5d3a ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.9.0-rc7-00002-g413d31338fca08 .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-5.9.0-rc7-00002-g413d31338fca08" of type "text/plain" (132594 bytes)

View attachment "job-script" of type "text/plain" (4574 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (8912 bytes)

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