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Message-Id: <20171109205622.GM3624@linux.vnet.ibm.com>
Date: Thu, 9 Nov 2017 12:56:22 -0800
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Jason Baron <jbaron@...mai.com>
Cc: Fengguang Wu <fengguang.wu@...el.com>,
linux-kernel@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Marc Zyngier <marc.zyngier@....com>,
Paolo Bonzini <pbonzini@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Steven Rostedt <rostedt@...dmis.org>,
Josh Triplett <josh@...htriplett.org>
Subject: Re: [jump_label_test] WARNING: CPU: 0 PID: 1 at
kernel/jump_label.c:761 jump_label_test+0x63/0xab
On Thu, Nov 09, 2017 at 03:13:24PM -0500, Jason Baron wrote:
> On 11/08/2017 02:01 AM, Fengguang Wu wrote:
> > On Tue, Nov 07, 2017 at 05:17:38PM -0500, Jason Baron wrote:
> >>
> >>
> >> On 11/07/2017 04:27 AM, Fengguang Wu wrote:
> >>> Hello,
> >>>
> >>> FYI this happens in v4.14-rc8 -- it's not necessarily a new bug.
> >>>
> >>
> >> Hi,
> >>
> >> So this looks like the branches aren't getting updated because the
> >> WARN_ON()s are all from the second half of the test loop (where we
> >> actually change the branch direction).
> >>
> >> I ran a kernel with a very similar .config on qemu-kvm/i386 as well, and
> >> was not able to trigger the WARN_ON(). Do you know if it happens on
> >> every boot or if there is some boot timing involved?
> >>
> >> You could try the patch below, to start to narrow down if this is a
> >> problem with jump table setup or with the update process.
> >
> > The problem disappears after this patch.
> >
>
> Ok, I can reproduce the issue if I enable CONFIG_RCU_PERF_TEST and add
> something like the following to the command-line: "rcuperf.shutdown=1
> rcuperf.holdoff=2".
Just to be clear, this combination of parameters says to start the test
-after- shutting down the system, which should not be expected to do
anything useful.
> The issue is that the core jump label code uses kernel_text_address() to
> ensure that it does not update branches in '__init' text after it has
> been freed. The check uses 'system_state' variable from
> core_kernel_text() to make the determination:
>
> if (system_state < SYSTEM_RUNNING &&
>
> init_kernel_text(addr))
>
> return 1;
>
> return 0;
>
> So the general idea is that system_state is set to SYSTEM_RUNNING after
> the __init text sections are freed, and thus we avoid updating jump
> label branches.
>
> However, in the case that rcuperf is enabled, it will call
> kernel_power_off() which in turn sets system_state to SYSTEM_POWER_OFF
> (which is > SYSTEM_RUNNING), potentially before the the initcalls have
> even been run. In this case, the jump label selftests called from __init
> via a late_initcall() can not update the branch direction, and thus we
> get the above warnings (due to the fact that the branches don't get
> udpated).
>
> So this is really not a new issue and really is only triggered in a
> debug setup, so I don't think this is 4.14 material in any way...
>
> One way to clean this up is to add a call into the jump label code
> similar to what ftrace does in ftrace_free_init_mem(). This gets called
> after the initcalls have run but before they are freed. Something like
> below.
Alternatively, rcuperf (and rcutorture and locktorture) could refused
to power off the system until the system state reaches SYSTEM_RUNNING.
That said, I am quite happy to have it fixed elsewhere. ;-)
Thanx, Paul
> Thanks,
>
> -Jason
>
> diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
> index 3b7675b..0202c58 100644
> --- a/include/linux/jump_label.h
> +++ b/include/linux/jump_label.h
> @@ -158,6 +158,7 @@ extern void arch_jump_label_transform(struct
> jump_entry *entry,
> extern void arch_jump_label_transform_static(struct jump_entry *entry,
> enum jump_label_type type);
> extern int jump_label_text_reserved(void *start, void *end);
> +extern void jump_label_invalidate_init(struct module *mod);
> extern void static_key_slow_inc(struct static_key *key);
> extern void static_key_slow_dec(struct static_key *key);
> extern void jump_label_apply_nops(struct module *mod);
> @@ -235,6 +236,8 @@ static inline int jump_label_apply_nops(struct
> module *mod)
> return 0;
> }
>
> +static inline void jump_label_invalidate_init(struct module *mod) {}
> +
> static inline void static_key_enable(struct static_key *key)
> {
> STATIC_KEY_CHECK_USE();
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 4b484ab..23e3cba 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -471,6 +471,7 @@ extern unsigned long long memparse(const char *ptr,
> char **retptr);
> extern bool parse_option_str(const char *str, const char *option);
> extern char *next_arg(char *args, char **param, char **val);
>
> +extern int init_kernel_text(unsigned long addr);
> extern int core_kernel_text(unsigned long addr);
> extern int core_kernel_data(unsigned long addr);
> extern int __kernel_text_address(unsigned long addr);
> diff --git a/init/main.c b/init/main.c
> index 0ee9c686..f4e5ab5 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -994,6 +994,7 @@ static int __ref kernel_init(void *unused)
> /* need to finish all async __init code before freeing the memory */
> async_synchronize_full();
> ftrace_free_init_mem();
> + jump_label_invalidate_init(NULL);
> free_initmem();
> mark_readonly();
> system_state = SYSTEM_RUNNING;
> diff --git a/kernel/extable.c b/kernel/extable.c
> index 9aa1cc4..1d69178 100644
> --- a/kernel/extable.c
> +++ b/kernel/extable.c
> @@ -62,7 +62,7 @@ const struct exception_table_entry
> *search_exception_tables(unsigned long addr)
> return e;
> }
>
> -static inline int init_kernel_text(unsigned long addr)
> +int init_kernel_text(unsigned long addr)
> {
> if (addr >= (unsigned long)_sinittext &&
> addr < (unsigned long)_einittext)
> diff --git a/kernel/jump_label.c b/kernel/jump_label.c
> index 0bf2e8f5..3f804f4 100644
> --- a/kernel/jump_label.c
> +++ b/kernel/jump_label.c
> @@ -359,16 +359,44 @@ static void __jump_label_update(struct static_key
> *key,
> struct jump_entry *stop)
> {
> for (; (entry < stop) && (jump_entry_key(entry) == key); entry++) {
> - /*
> - * entry->code set to 0 invalidates module init text
> sections
> - * kernel_text_address() verifies we are not in core kernel
> - * init code, see jump_label_invalidate_module_init().
> - */
> - if (entry->code && kernel_text_address(entry->code))
> + /* entry->code set to 0 invalidates __init text sections */
> + if (entry->code)
> arch_jump_label_transform(entry,
> jump_label_type(entry));
> }
> }
>
> +void jump_label_invalidate_init(struct module *mod)
> +{
> + struct jump_entry *iter_start = mod->jump_entries;
> + struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
> + struct jump_entry *iter;
> +
> + if (mod) {
> + iter_start = mod->jump_entries;
> + iter_stop = iter_start + mod->num_jump_entries;
> + } else {
> + jump_label_lock();
> + iter_start = __start___jump_table;
> + iter_stop = __stop___jump_table;
> + }
> +
> + for (iter = iter_start; iter < iter_stop; iter++) {
> + if (mod) {
> + if (!within_module_init(iter->code, mod) &&
> + !within_module_init(iter->target, mod))
> + continue;
> + } else {
> + if (!init_kernel_text(iter->code) &&
> + !init_kernel_text(iter->target))
> + continue;
> + }
> + iter->code = 0;
> + }
> +
> + if (!mod)
> + jump_label_unlock();
> +}
> +
> void __init jump_label_init(void)
> {
> struct jump_entry *iter_start = __start___jump_table;
> @@ -627,18 +655,6 @@ static void jump_label_del_module(struct module *mod)
> }
> }
>
> -static void jump_label_invalidate_module_init(struct module *mod)
> -{
> - struct jump_entry *iter_start = mod->jump_entries;
> - struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
> - struct jump_entry *iter;
> -
> - for (iter = iter_start; iter < iter_stop; iter++) {
> - if (within_module_init(iter->code, mod))
> - iter->code = 0;
> - }
> -}
> -
> static int
> jump_label_module_notify(struct notifier_block *self, unsigned long val,
> void *data)
> @@ -661,7 +677,7 @@ jump_label_module_notify(struct notifier_block
> *self, unsigned long val,
> jump_label_del_module(mod);
> break;
> case MODULE_STATE_LIVE:
> - jump_label_invalidate_module_init(mod);
> + jump_label_invalidate_init(mod);
> break;
> }
>
>
>
>
> > The dmesg is now:
> >
> > [ 7.342618] IRQ10 -> 0:10
> > [ 7.343025] IRQ11 -> 0:11
> > [ 7.343450] IRQ12 -> 0:12
> > [ 7.343770] IRQ13 -> 0:13
> > [ 7.344079] IRQ14 -> 0:14
> > [ 7.344379] IRQ15 -> 0:15
> > [ 7.344690] .................................... done.
> > [ 7.345271] Using IPI Shortcut mode
> > [ 7.345682] sched_clock: Marking stable (7344687295, 0)->(7595176493,
> > -250489198)
> > [ 7.346516] __jump_label_update: key: 0xcd3a0dec, code: 0xcca65b30,
> > target: 0xcca65b40
> > [ 7.347600] __jump_label_update: key: 0xcd3a0dec, code: 0xcca65999,
> > target: 0xcca659b8
> > [ 7.349195] __jump_label_update: key: 0xcd3a0dec, code: 0xcca65c50,
> > target: 0xcca65c9a
> > [ 7.350075] __jump_label_update: key: 0xcd3a0dec, code: 0xcca65bf0,
> > target: 0xcca65bf8
> > [ 7.350963] __jump_label_update: key: 0xcd3a0dec, code: 0xcca65b90,
> > target: 0xcca65b98
> > [ 7.351848] __jump_label_update: key: 0xcd3a0dec, code: 0xcca65b68,
> > target: 0xcca65b63
> > [ 7.353000] jump_label: disable sk_true: cd2adc60
> > [ 7.353668] __jump_label_update: key: 0xcd2adc60, code: 0xcd31ae3c,
> > target: 0xcd31ae9d
> > [ 7.354852] __jump_label_update: key: 0xcd2adc60, code: 0xcd31add7,
> > target: 0xcd31adde
> > [ 7.356021] __jump_label_update: key: 0xcd2adc60, code: 0xcd31ae35,
> > target: 0xcd31ae3c
> > [ 7.357023] __jump_label_update: key: 0xcd2adc60, code: 0xcd31add2,
> > target: 0xcd31ae8f
> > [ 7.357970] jump_label: enable sk_false: cda8ef5c
> > [ 7.358682] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ae46,
> > target: 0xcd31ae4d
> > [ 7.359858] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ade5,
> > target: 0xcd31ae96
> > [ 7.361049] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ae41,
> > target: 0xcd31aea1
> > [ 7.362235] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31adde,
> > target: 0xcd31ade5
> > [ 7.363408] jump_label: enable sk_true: cd2adc60
> > [ 7.364100] __jump_label_update: key: 0xcd2adc60, code: 0xcd31ae3c,
> > target: 0xcd31ae9d
> > [ 7.365282] __jump_label_update: key: 0xcd2adc60, code: 0xcd31add7,
> > target: 0xcd31adde
> > [ 7.366465] __jump_label_update: key: 0xcd2adc60, code: 0xcd31ae35,
> > target: 0xcd31ae3c
> > [ 7.367639] __jump_label_update: key: 0xcd2adc60, code: 0xcd31add2,
> > target: 0xcd31ae8f
> > [ 7.368818] jump_label: disable sk_false: cda8ef5c
> > [ 7.369538] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ae46,
> > target: 0xcd31ae4d
> > [ 7.370716] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ade5,
> > target: 0xcd31ae96
> > [ 7.371900] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ae41,
> > target: 0xcd31aea1
> > [ 7.373087] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31adde,
> > target: 0xcd31ade5
> > [ 7.374275] jump_label: disable sk_true: cd2adc60
> > [ 7.374991] __jump_label_update: key: 0xcd2adc60, code: 0xcd31ae3c,
> > target: 0xcd31ae9d
> > [ 7.376175] __jump_label_update: key: 0xcd2adc60, code: 0xcd31add7,
> > target: 0xcd31adde
> > [ 7.377368] __jump_label_update: key: 0xcd2adc60, code: 0xcd31ae35,
> > target: 0xcd31ae3c
> > [ 7.378565] __jump_label_update: key: 0xcd2adc60, code: 0xcd31add2,
> > target: 0xcd31ae8f
> > [ 7.379750] jump_label: enable sk_false: cda8ef5c
> > [ 7.380459] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ae46,
> > target: 0xcd31ae4d
> > [ 7.381654] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ade5,
> > target: 0xcd31ae96
> > [ 7.382855] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ae41,
> > target: 0xcd31aea1
> > [ 7.384046] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31adde,
> > target: 0xcd31ade5
> > [ 7.385243] jump_label: enable sk_true: cd2adc60
> > [ 7.385944] __jump_label_update: key: 0xcd2adc60, code: 0xcd31ae3c,
> > target: 0xcd31ae9d
> > [ 7.387109] __jump_label_update: key: 0xcd2adc60, code: 0xcd31add7,
> > target: 0xcd31adde
> > [ 7.388276] __jump_label_update: key: 0xcd2adc60, code: 0xcd31ae35,
> > target: 0xcd31ae3c
> > [ 7.389449] __jump_label_update: key: 0xcd2adc60, code: 0xcd31add2,
> > target: 0xcd31ae8f
> > [ 7.390621] jump_label: disable sk_false: cda8ef5c
> > [ 7.391337] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ae46,
> > target: 0xcd31ae4d
> > [ 7.392509] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ade5,
> > target: 0xcd31ae96
> > [ 7.393973] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31ae41,
> > target: 0xcd31aea1
> > [ 7.395025] __jump_label_update: key: 0xcda8ef5c, code: 0xcd31adde,
> > target: 0xcd31ade5
> > [ 7.398024] debug: unmapping init [mem 0xcd305000-0xcd38ffff]
> > [ 7.398757] Write protecting the kernel text: 5796k
> > [ 7.399449] Write protecting the kernel read-only data: 2736k
> >
> > Thanks,
> > Fengguang
> >
> >> Thanks,
> >>
> >> -Jason
> >>
> >>
> >> diff --git a/kernel/jump_label.c b/kernel/jump_label.c
> >> index 0bf2e8f5..433cc94 100644
> >> --- a/kernel/jump_label.c
> >> +++ b/kernel/jump_label.c
> >> @@ -364,8 +364,13 @@ static void __jump_label_update(struct static_key
> >> *key,
> >> * kernel_text_address() verifies we are not in core
> >> kernel
> >> * init code, see jump_label_invalidate_module_init().
> >> */
> >> - if (entry->code && kernel_text_address(entry->code))
> >> + if (entry->code && kernel_text_address(entry->code)) {
> >> + printk("%s: key: 0x%lx, code: 0x%lx, target:
> >> 0x%lx\n",
> >> + __func__, (unsigned
> >> long)jump_entry_key(entry),
> >> + (unsigned long)entry->code,
> >> + (unsigned long)entry->target);
> >> arch_jump_label_transform(entry,
> >> jump_label_type(entry));
> >> + }
> >> }
> >> }
> >>
> >> @@ -752,7 +757,9 @@ static __init int jump_label_test(void)
> >> WARN_ON(static_branch_likely(&sk_false));
> >> WARN_ON(static_branch_unlikely(&sk_false));
> >>
> >> + printk("jump_label: disable sk_true: %p\n", &sk_true);
> >> static_branch_disable(&sk_true);
> >> + printk("jump_label: enable sk_false: %p\n", &sk_false);
> >> static_branch_enable(&sk_false);
> >>
> >> WARN_ON(static_key_enabled(&sk_true.key) == true);
> >> @@ -763,7 +770,9 @@ static __init int jump_label_test(void)
> >> WARN_ON(!static_branch_likely(&sk_false));
> >> WARN_ON(!static_branch_unlikely(&sk_false));
> >>
> >> + printk("jump_label: enable sk_true: %p\n", &sk_true);
> >> static_branch_enable(&sk_true);
> >> + printk("jump_label: disable sk_false: %p\n", &sk_false);
> >> static_branch_disable(&sk_false);
> >> }
> >>
> >>
> >>
> >>
> >>> [ 15.214834] IRQ15 -> 0:15
> >>> [ 15.214834] .................................... done.
> >>> [ 15.214834] Using IPI Shortcut mode
> >>> [ 15.214834] sched_clock: Marking stable (15210834346,
> >>> 0)->(15797181340, -586346994)
> >>> [ 17.667168] ------------[ cut here ]------------
> >>> [ 17.668895] WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:761
> >>> jump_label_test+0x63/0xab
> >>> [ 17.672346] Modules linked in:
> >>> [ 17.673475] CPU: 0 PID: 1 Comm: swapper Not tainted 4.14.0-rc8 #29
> >>> [ 17.675724] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS 1.10.2-1 04/01/2014
> >>> [ 17.678755] task: c0020d00 task.stack: c0022000
> >>> [ 17.680423] EIP: jump_label_test+0x63/0xab
> >>> [ 17.681912] EFLAGS: 00210202 CPU: 0
> >>> [ 17.683206] EAX: 00000001 EBX: 00000002 ECX: 00000004 EDX: 00000000
> >>> [ 17.685501] ESI: c9918db6 EDI: 00000000 EBP: 00000000 ESP: c0023f40
> >>> [ 17.687787] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> >>> [ 17.689748] CR0: 80050033 CR2: 00000000 CR3: 09991000 CR4: 000006b0
> >>> [ 17.692019] Call Trace:
> >>> [ 17.692938] ? do_one_initcall+0x2c/0x13a
> >>> [ 17.694398] ? parse_args+0x1af/0x300
> >>> [ 17.695740] ? kernel_init_freeable+0xce/0x161
> >>> [ 17.697370] ? kernel_init_freeable+0xee/0x161
> >>> [ 17.698986] ? rest_init+0xb0/0xb0
> >>> [ 17.700236] ? kernel_init+0x5/0xe0
> >>> [ 17.701513] ? ret_from_fork+0x19/0x30
> >>> [ 17.702876] Code: c9 e8 3c 59 7b ff b8 5c cf 08 ca e8 a2 58 7b ff
> >>> a1 60 bc 8a c9 85 c0 74 02 0f ff a1 5c cf 08 ca 85 c0 75 02 0f ff 3e
> >>> 8d 74 26 00 <0f> ff e9 35 00 00 00 e9 34 00 00 00 3e 8d 74 26 00 0f
> >>> ff b8 60
> >>> [ 17.709721] ---[ end trace f18711bfa2b1114e ]---
> >>> [ 17.711418] ------------[ cut here ]------------
> >>> [ 17.711418] ------------[ cut here ]------------
> >>> [ 17.713092] WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:762
> >>> jump_label_test+0x9f/0xab
> >>> [ 17.716534] Modules linked in:
> >>> [ 17.717665] CPU: 0 PID: 1 Comm: swapper Tainted: G W
> >>> 4.14.0-rc8 #29
> >>> [ 17.720349] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS 1.10.2-1 04/01/2014
> >>> [ 17.723362] task: c0020d00 task.stack: c0022000
> >>> [ 17.725004] EIP: jump_label_test+0x9f/0xab
> >>> [ 17.726516] EFLAGS: 00210202 CPU: 0
> >>> [ 17.727785] EAX: 00000001 EBX: 00000002 ECX: 00000004 EDX: 00000000
> >>> [ 17.730058] ESI: c9918db6 EDI: 00000000 EBP: 00000000 ESP: c0023f40
> >>> [ 17.732341] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> >>> [ 17.734300] CR0: 80050033 CR2: 00000000 CR3: 09991000 CR4: 000006b0
> >>> [ 17.736560] Call Trace:
> >>> [ 17.737476] ? do_one_initcall+0x2c/0x13a
> >>> [ 17.738943] ? parse_args+0x1af/0x300
> >>> [ 17.740326] ? kernel_init_freeable+0xce/0x161
> >>> [ 17.741943] ? kernel_init_freeable+0xee/0x161
> >>> [ 17.743571] ? rest_init+0xb0/0xb0
> >>> [ 17.744820] ? kernel_init+0x5/0xe0
> >>> [ 17.746095] ? ret_from_fork+0x19/0x30
> >>> [ 17.747474] Code: 0f ff b8 60 bc 8a c9 e8 6a 58 7b ff b8 5c cf 08
> >>> ca e8 f0 58 7b ff 4b 74 1a bb 01 00 00 00 e9 6f ff ff ff 0f ff eb 86
> >>> 0f ff eb 95 <0f> ff eb c7 0f ff eb c8 31 c0 5b c3 b8 68 bc 8a c9 e9
> >>> 25 d4 77
> >>> [ 17.754356] ---[ end trace f18711bfa2b1114f ]---
> >>> [ 17.755649] ------------[ cut here ]------------
> >>> [ 17.755649] ------------[ cut here ]------------
> >>> [ 17.756863] WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:763
> >>> jump_label_test+0xa3/0xab
> >>> [ 17.759289] Modules linked in:
> >>> [ 17.760082] CPU: 0 PID: 1 Comm: swapper Tainted: G W
> >>> 4.14.0-rc8 #29
> >>> [ 17.761983] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS 1.10.2-1 04/01/2014
> >>> [ 17.764723] task: c0020d00 task.stack: c0022000
> >>> [ 17.766378] EIP: jump_label_test+0xa3/0xab
> >>> [ 17.767470] EFLAGS: 00210202 CPU: 0
> >>> [ 17.769223] EAX: 00000001 EBX: 00000002 ECX: 00000004 EDX: 00000000
> >>> [ 17.771188] ESI: c9918db6 EDI: 00000000 EBP: 00000000 ESP: c0023f40
> >>> [ 17.773495] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> >>> [ 17.774916] CR0: 80050033 CR2: 00000000 CR3: 09991000 CR4: 000006b0
> >>> [ 17.776576] Call Trace:
> >>> [ 17.777249] ? do_one_initcall+0x2c/0x13a
> >>> [ 17.778318] ? parse_args+0x1af/0x300
> >>> [ 17.779292] ? kernel_init_freeable+0xce/0x161
> >>> [ 17.780443] ? kernel_init_freeable+0xee/0x161
> >>> [ 17.781558] ? rest_init+0xb0/0xb0
> >>> [ 17.782463] ? kernel_init+0x5/0xe0
> >>> [ 17.783394] ? ret_from_fork+0x19/0x30
> >>> [ 17.784376] Code: bc 8a c9 e8 6a 58 7b ff b8 5c cf 08 ca e8 f0 58
> >>> 7b ff 4b 74 1a bb 01 00 00 00 e9 6f ff ff ff 0f ff eb 86 0f ff eb 95
> >>> 0f ff eb c7 <0f> ff eb c8 31 c0 5b c3 b8 68 bc 8a c9 e9 25 d4 77 ff
> >>> 80 3d a0
> >>> [ 17.789290] ---[ end trace f18711bfa2b11150 ]---
> >>> [ 17.790487] ------------[ cut here ]------------
> >>> [ 17.790487] ------------[ cut here ]------------
> >>> [ 17.792555] WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:764
> >>> jump_label_test+0x74/0xab
> >>> [ 17.796930] Modules linked in:
> >>> [ 17.798391] CPU: 0 PID: 1 Comm: swapper Tainted: G W
> >>> 4.14.0-rc8 #29
> >>> [ 17.801754] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS 1.10.2-1 04/01/2014
> >>> [ 17.805496] task: c0020d00 task.stack: c0022000
> >>> [ 17.806702] EIP: jump_label_test+0x74/0xab
> >>> [ 17.807786] EFLAGS: 00210202 CPU: 0
> >>> [ 17.808726] EAX: 00000001 EBX: 00000002 ECX: 00000004 EDX: 00000000
> >>> [ 17.810368] ESI: c9918db6 EDI: 00000000 EBP: 00000000 ESP: c0023f40
> >>> [ 17.811994] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> >>> [ 17.813424] CR0: 80050033 CR2: 00000000 CR3: 09991000 CR4: 000006b0
> >>> [ 17.815063] Call Trace:
> >>> [ 17.815748] ? do_one_initcall+0x2c/0x13a
> >>> [ 17.816822] ? parse_args+0x1af/0x300
> >>> [ 17.817812] ? kernel_init_freeable+0xce/0x161
> >>> [ 17.818986] ? kernel_init_freeable+0xee/0x161
> >>> [ 17.820172] ? rest_init+0xb0/0xb0
> >>> [ 17.821081] ? kernel_init+0x5/0xe0
> >>> [ 17.822033] ? ret_from_fork+0x19/0x30
> >>> [ 17.823051] Code: 60 bc 8a c9 85 c0 74 02 0f ff a1 5c cf 08 ca 85
> >>> c0 75 02 0f ff 3e 8d 74 26 00 0f ff e9 35 00 00 00 e9 34 00 00 00 3e
> >>> 8d 74 26 00 <0f> ff b8 60 bc 8a c9 e8 6a 58 7b ff b8 5c cf 08 ca e8
> >>> f0 58 7b
> >>> [ 17.828103] ---[ end trace f18711bfa2b11151 ]---
> >>> [ 17.829379] ------------[ cut here ]------------
> >>> [ 17.829379] ------------[ cut here ]------------
> >>> [ 17.830622] WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:761
> >>> jump_label_test+0x63/0xab
> >>> [ 17.833131] Modules linked in:
> >>> [ 17.833973] CPU: 0 PID: 1 Comm: swapper Tainted: G W
> >>> 4.14.0-rc8 #29
> >>> [ 17.835923] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS 1.10.2-1 04/01/2014
> >>> [ 17.838126] task: c0020d00 task.stack: c0022000
> >>> [ 17.839355] EIP: jump_label_test+0x63/0xab
> >>> [ 17.840447] EFLAGS: 00210202 CPU: 0
> >>> [ 17.841384] EAX: 00000001 EBX: 00000001 ECX: 00000004 EDX: 00000000
> >>> [ 17.843034] ESI: c9918db6 EDI: 00000000 EBP: 00000000 ESP: c0023f40
> >>> [ 17.844698] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> >>> [ 17.846127] CR0: 80050033 CR2: 00000000 CR3: 09991000 CR4: 000006b0
> >>> [ 17.847794] Call Trace:
> >>> [ 17.848472] ? do_one_initcall+0x2c/0x13a
> >>> [ 17.849547] ? parse_args+0x1af/0x300
> >>> [ 17.850590] ? kernel_init_freeable+0xce/0x161
> >>> [ 17.851783] ? kernel_init_freeable+0xee/0x161
> >>> [ 17.852977] ? rest_init+0xb0/0xb0
> >>> [ 17.854277] ? kernel_init+0x5/0xe0
> >>> [ 17.855571] ? ret_from_fork+0x19/0x30
> >>> [ 17.856955] Code: c9 e8 3c 59 7b ff b8 5c cf 08 ca e8 a2 58 7b ff
> >>> a1 60 bc 8a c9 85 c0 74 02 0f ff a1 5c cf 08 ca 85 c0 75 02 0f ff 3e
> >>> 8d 74 26 00 <0f> ff e9 35 00 00 00 e9 34 00 00 00 3e 8d 74 26 00 0f
> >>> ff b8 60
> >>> [ 17.863904] ---[ end trace f18711bfa2b11152 ]---
> >>> [ 17.865629] ------------[ cut here ]------------
> >>> [ 17.865629] ------------[ cut here ]------------
> >>> [ 17.867438] WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:762
> >>> jump_label_test+0x9f/0xab
> >>> [ 17.871148] Modules linked in:
> >>> [ 17.872450] CPU: 0 PID: 1 Comm: swapper Tainted: G W
> >>> 4.14.0-rc8 #29
> >>> [ 17.875124] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS 1.10.2-1 04/01/2014
> >>> [ 17.878364] task: c0020d00 task.stack: c0022000
> >>> [ 17.880027] EIP: jump_label_test+0x9f/0xab
> >>> [ 17.881544] EFLAGS: 00210202 CPU: 0
> >>> [ 17.882901] EAX: 00000001 EBX: 00000001 ECX: 00000004 EDX: 00000000
> >>> [ 17.885473] ESI: c9918db6 EDI: 00000000 EBP: 00000000 ESP: c0023f40
> >>> [ 17.887934] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> >>> [ 17.890009] CR0: 80050033 CR2: 00000000 CR3: 09991000 CR4: 000006b0
> >>> [ 17.892339] Call Trace:
> >>> [ 17.893316] ? do_one_initcall+0x2c/0x13a
> >>> [ 17.894822] ? parse_args+0x1af/0x300
> >>> [ 17.896911] ? kernel_init_freeable+0xce/0x161
> >>> [ 17.899626] ? kernel_init_freeable+0xee/0x161
> >>> [ 17.902732] ? rest_init+0xb0/0xb0
> >>> [ 17.904894] ? kernel_init+0x5/0xe0
> >>> [ 17.907031] ? ret_from_fork+0x19/0x30
> >>> [ 17.909383] Code: 0f ff b8 60 bc 8a c9 e8 6a 58 7b ff b8 5c cf 08
> >>> ca e8 f0 58 7b ff 4b 74 1a bb 01 00 00 00 e9 6f ff ff ff 0f ff eb 86
> >>> 0f ff eb 95 <0f> ff eb c7 0f ff eb c8 31 c0 5b c3 b8 68 bc 8a c9 e9
> >>> 25 d4 77
> >>> [ 17.928301] ---[ end trace f18711bfa2b11153 ]---
> >>> [ 17.931515] ------------[ cut here ]------------
> >>> [ 17.931515] ------------[ cut here ]------------
> >>> [ 17.943868] WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:763
> >>> jump_label_test+0xa3/0xab
> >>> [ 17.950147] Modules linked in:
> >>> [ 17.952135] CPU: 0 PID: 1 Comm: swapper Tainted: G W
> >>> 4.14.0-rc8 #29
> >>> [ 17.956297] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS 1.10.2-1 04/01/2014
> >>> [ 17.964556] task: c0020d00 task.stack: c0022000
> >>> [ 17.985804] EIP: jump_label_test+0xa3/0xab
> >>> [ 17.988269] EFLAGS: 00210202 CPU: 0
> >>> [ 17.990407] EAX: 00000001 EBX: 00000001 ECX: 00000004 EDX: 00000000
> >>> [ 17.996820] ESI: c9918db6 EDI: 00000000 EBP: 00000000 ESP: c0023f40
> >>> [ 18.000174] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> >>> [ 18.003505] CR0: 80050033 CR2: 00000000 CR3: 09991000 CR4: 000006b0
> >>> [ 18.007251] Call Trace:
> >>> [ 18.008897] ? do_one_initcall+0x2c/0x13a
> >>> [ 18.016611] ? parse_args+0x1af/0x300
> >>> [ 18.018854] ? kernel_init_freeable+0xce/0x161
> >>> [ 18.021573] ? kernel_init_freeable+0xee/0x161
> >>> [ 18.024418] ? rest_init+0xb0/0xb0
> >>> [ 18.026326] ? kernel_init+0x5/0xe0
> >>> [ 18.028418] ? ret_from_fork+0x19/0x30
> >>> [ 18.031569] Code: bc 8a c9 e8 6a 58 7b ff b8 5c cf 08 ca e8 f0 58
> >>> 7b ff 4b 74 1a bb 01 00 00 00 e9 6f ff ff ff 0f ff eb 86 0f ff eb 95
> >>> 0f ff eb c7 <0f> ff eb c8 31 c0 5b c3 b8 68 bc 8a c9 e9 25 d4 77 ff
> >>> 80 3d a0
> >>> [ 18.050687] ---[ end trace f18711bfa2b11154 ]---
> >>> [ 18.060661] ------------[ cut here ]------------
> >>> [ 18.060661] ------------[ cut here ]------------
> >>> [ 18.064196] WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:764
> >>> jump_label_test+0x74/0xab
> >>> [ 18.076475] Modules linked in:
> >>> [ 18.083657] CPU: 0 PID: 1 Comm: swapper Tainted: G W
> >>> 4.14.0-rc8 #29
> >>> [ 18.101662] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS 1.10.2-1 04/01/2014
> >>> [ 18.109794] task: c0020d00 task.stack: c0022000
> >>> [ 18.112995] EIP: jump_label_test+0x74/0xab
> >>> [ 18.115714] EFLAGS: 00210202 CPU: 0
> >>> [ 18.118265] EAX: 00000001 EBX: 00000001 ECX: 00000004 EDX: 00000000
> >>> [ 18.125065] ESI: c9918db6 EDI: 00000000 EBP: 00000000 ESP: c0023f40
> >>> [ 18.128653] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> >>> [ 18.130955] CR0: 80050033 CR2: 00000000 CR3: 09991000 CR4: 000006b0
> >>> [ 18.136512] Call Trace:
> >>> [ 18.137684] ? do_one_initcall+0x2c/0x13a
> >>> [ 18.141253] ? parse_args+0x1af/0x300
> >>> [ 18.143612] ? kernel_init_freeable+0xce/0x161
> >>> [ 18.146407] ? kernel_init_freeable+0xee/0x161
> >>> [ 18.149921] ? rest_init+0xb0/0xb0
> >>> [ 18.151599] ? kernel_init+0x5/0xe0
> >>> [ 18.153257] ? ret_from_fork+0x19/0x30
> >>> [ 18.155487] Code: 60 bc 8a c9 85 c0 74 02 0f ff a1 5c cf 08 ca 85
> >>> c0 75 02 0f ff 3e 8d 74 26 00 0f ff e9 35 00 00 00 e9 34 00 00 00 3e
> >>> 8d 74 26 00 <0f> ff b8 60 bc 8a c9 e8 6a 58 7b ff b8 5c cf 08 ca e8
> >>> f0 58 7b
> >>> [ 18.167223] ---[ end trace f18711bfa2b11155 ]---
> >>>
> >>> Attached the full dmesg and kconfig.
> >>>
> >>> Thanks,
> >>> Fengguang
> >>>
> >>
>
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