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Date: Mon, 1 Mar 2021 15:40:27 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Kees Cook <keescook@...omium.org>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com
Subject: [x86, build] 6dafca9780:
WARNING:at_arch/x86/kernel/ftrace.c:#ftrace_verify_code
Greeting,
FYI, we noticed the following commit (built with clang-13):
commit: 6dafca97803309c3cb5148d449bfa711e41ddef2 ("x86, build: use objtool mcount")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
in testcase: trinity
version: trinity-x86_64-4d2343bd-1_20210105
with following parameters:
group: ["group-00", "group-01", "group-02", "group-03", "group-04"]
test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/
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):
+---------------------------------------------------------+------------+------------+
| | 22c8542d7b | 6dafca9780 |
+---------------------------------------------------------+------------+------------+
| WARNING:at_arch/x86/kernel/ftrace.c:#ftrace_verify_code | 0 | 18 |
| RIP:ftrace_verify_code | 0 | 18 |
| WARNING:at_kernel/trace/ftrace.c:#ftrace_bug | 0 | 18 |
| RIP:ftrace_bug | 0 | 18 |
+---------------------------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 4.743393] WARNING: CPU: 0 PID: 1 at arch/x86/kernel/ftrace.c:96 ftrace_verify_code (kbuild/src/consumer/arch/x86/kernel/ftrace.c:96)
[ 4.744022] Modules linked in:
[ 4.744254] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.11.0-rc2-00022-g6dafca978033 #2
[ 4.744827] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 4.745423] RIP: 0010:ftrace_verify_code (kbuild/src/consumer/arch/x86/kernel/ftrace.c:96)
[ 4.745776] Code: 03 33 03 8a 4c 24 07 32 4b 04 0f b6 c9 09 c1 74 41 48 c7 c7 a0 30 22 83 be 01 00 00 00 31 d2 b9 01 00 00 00 e8 4e 23 1b 00 90 <0f> 0b 90 bb ea ff ff ff 48 c7 c7 d0 30 22 83 be 01 00 00 00 31 d2
All code
========
0: 03 33 add (%rbx),%esi
2: 03 8a 4c 24 07 32 add 0x3207244c(%rdx),%ecx
8: 4b 04 0f rex.WXB add $0xf,%al
b: b6 c9 mov $0xc9,%dh
d: 09 c1 or %eax,%ecx
f: 74 41 je 0x52
11: 48 c7 c7 a0 30 22 83 mov $0xffffffff832230a0,%rdi
18: be 01 00 00 00 mov $0x1,%esi
1d: 31 d2 xor %edx,%edx
1f: b9 01 00 00 00 mov $0x1,%ecx
24: e8 4e 23 1b 00 callq 0x1b2377
29: 90 nop
2a:* 0f 0b ud2 <-- trapping instruction
2c: 90 nop
2d: bb ea ff ff ff mov $0xffffffea,%ebx
32: 48 c7 c7 d0 30 22 83 mov $0xffffffff832230d0,%rdi
39: be 01 00 00 00 mov $0x1,%esi
3e: 31 d2 xor %edx,%edx
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 90 nop
3: bb ea ff ff ff mov $0xffffffea,%ebx
8: 48 c7 c7 d0 30 22 83 mov $0xffffffff832230d0,%rdi
f: be 01 00 00 00 mov $0x1,%esi
14: 31 d2 xor %edx,%edx
[ 4.747093] RSP: 0000:ffff8881003cbb50 EFLAGS: 00010202
[ 4.747472] RAX: 0000000066227969 RBX: ffffffff82204214 RCX: 0000000000000001
[ 4.748050] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff832230b8
[ 4.748568] RBP: 0000000000000001 R08: 00000000a0000002 R09: 0000000040000000
[ 4.749081] R10: 0000000000000001 R11: 0000000080000000 R12: 0000000000000000
[ 4.749594] R13: 00000000009aa301 R14: 0000000000000001 R15: ffff88810009f9f0
[ 4.750110] FS: 0000000000000000(0000) GS:ffff88823fa00000(0000) knlGS:0000000000000000
[ 4.750690] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4.751110] CR2: 0000000000000000 CR3: 0000000002c12000 CR4: 00000000000406b0
[ 4.751625] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4.752145] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4.752659] Call Trace:
[ 4.754727] ftrace_replace_code (kbuild/src/consumer/arch/x86/kernel/ftrace.c:220)
[ 4.755046] ftrace_modify_all_code (kbuild/src/consumer/kernel/trace/ftrace.c:2691)
[ 4.755378] ftrace_run_update_code (kbuild/src/consumer/kernel/trace/ftrace.c:2770)
[ 4.755709] ftrace_startup (kbuild/src/consumer/kernel/trace/ftrace.c:2897)
[ 4.755997] register_ftrace_function (kbuild/src/consumer/kernel/trace/ftrace.c:7516)
[ 4.756335] arm_kprobe_ftrace (kbuild/src/consumer/kernel/kprobes.c:1049 kbuild/src/consumer/kernel/kprobes.c:1071)
[ 4.756631] enable_kprobe (kbuild/src/consumer/kernel/kprobes.c:2189)
[ 4.756904] enable_trace_kprobe (kbuild/src/consumer/kernel/trace/trace_kprobe.c:381)
[ 4.757220] __ftrace_event_enable_disable (kbuild/src/consumer/kernel/trace/trace_events.c:457)
[ 4.757605] __ftrace_set_clr_event_nolock (kbuild/src/consumer/kernel/trace/trace_events.c:818)
[ 4.758002] trace_array_set_clr_event (kbuild/src/consumer/kernel/trace/trace_events.c:833 kbuild/src/consumer/kernel/trace/trace_events.c:924)
[ 4.758352] test_gen_kprobe_cmd (kbuild/src/consumer/kernel/trace/kprobe_event_gen_test.c:95)
[ 4.758676] ? kprobe_event_cmd_init (kbuild/src/consumer/kernel/trace/trace_kprobe.c:924)
[ 4.759007] ? init_trace_printk (kbuild/src/consumer/kernel/trace/kprobe_event_gen_test.c:176)
[ 4.759310] kprobe_event_gen_test_init (kbuild/src/consumer/kernel/trace/kprobe_event_gen_test.c:179)
[ 4.759654] do_one_initcall (kbuild/src/consumer/init/main.c:1217)
[ 4.759947] ? native_sched_clock (kbuild/src/consumer/arch/x86/kernel/tsc.c:243)
[ 4.760272] ? sched_clock_cpu (kbuild/src/consumer/kernel/sched/clock.c:273 kbuild/src/consumer/kernel/sched/clock.c:382)
[ 4.760571] ? pvclock_clocksource_read (kbuild/src/consumer/arch/x86/kernel/pvclock.c:80)
[ 4.760927] ? __fs_reclaim_release (kbuild/src/consumer/mm/page_alloc.c:4328)
[ 4.761248] ? kvm_sched_clock_read (kbuild/src/consumer/arch/x86/include/asm/preempt.h:84 kbuild/src/consumer/arch/x86/kernel/kvmclock.c:90 kbuild/src/consumer/arch/x86/kernel/kvmclock.c:101)
[ 4.761571] ? sched_clock (kbuild/src/consumer/arch/x86/include/asm/paravirt.h:22 kbuild/src/consumer/arch/x86/kernel/tsc.c:252)
[ 4.761834] ? sched_clock_cpu (kbuild/src/consumer/kernel/sched/clock.c:273 kbuild/src/consumer/kernel/sched/clock.c:382)
[ 4.762138] ? parse_args (kbuild/src/consumer/kernel/params.c:153 kbuild/src/consumer/kernel/params.c:188)
[ 4.762432] do_initcall_level (kbuild/src/consumer/init/main.c:1289)
[ 4.762730] do_initcalls (kbuild/src/consumer/init/main.c:1303)
[ 4.763019] ? rest_init (kbuild/src/consumer/init/main.c:1412)
[ 4.763291] kernel_init_freeable (kbuild/src/consumer/init/main.c:1534)
[ 4.763601] kernel_init (kbuild/src/consumer/init/main.c:1417)
[ 4.763864] ret_from_fork (kbuild/src/consumer/arch/x86/entry/entry_64.S:302)
[ 4.764159] ---[ end trace cde667a4bb4795ca ]---
[ 4.764496] ------------[ ftrace bug ]------------
[ 4.764847] ftrace failed to modify
[ 4.764852] do_sys_open (kbuild/src/consumer/fs/open.c:1186)
[ 4.765483] actual: 0f:1f:44:00:00
[ 4.765784] Setting ftrace call site to call ftrace function
[ 4.766193] ftrace record flags: 50000001
[ 4.766490] (1) R
[ 4.766490] expected tramp: ffffffff81037af0
[ 4.766959] ------------[ cut here ]------------
To reproduce:
# build kernel
cd linux
cp config-5.11.0-rc2-00022-g6dafca978033 .config
make HOSTCC=clang-13 CC=clang-13 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-5.11.0-rc2-00022-g6dafca978033" of type "text/plain" (120427 bytes)
View attachment "job-script" of type "text/plain" (4409 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (20232 bytes)
View attachment "trinity" of type "text/plain" (14768 bytes)
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