* 【BUG】The kernel start fail when enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL
@ 2017-10-17 5:54 ` Bixuan Cui
0 siblings, 0 replies; 6+ messages in thread
From: Bixuan Cui @ 2017-10-17 5:54 UTC (permalink / raw)
To: linux-arm-kernel
Hi,
I try to start the kernel(v4.14.0-rc4) by qemu while enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL(use arch/arm64/configs/defconfig) at the same time. Then
it hang:
qemu-system-aarch64 -kernel Image -m 2048 -smp 8 -initrd qemu-le.rootfs -cpu cortex-a57 -nographic -machine virt,kernel_irqchip=on -append 'console=ttyAMA0 root=/dev/ram rdinit=/sbin/init nohz_full=1 earlycon=pl011,0x9000000' -rtc base=localtime -device virtio-net-device,netdev=net0 -netdev type=tap,id=net0,script=no,downscript=no,ifname=tap2
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.14.0-rc4 #24 SMP PREEMPT Mon Oct 16 11:02:11 CST 2017
[ 0.000000] Boot CPU: AArch64 Processor [411fd070]
[ 0.000000] Machine model: linux,dummy-virt
[ 0.000000] earlycon: pl11 at MMIO 0x0000000009000000 (options '')
[ 0.000000] bootconsole [pl11] enabled
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] cma: Reserved 64 MiB at 0x00000000bc000000
After I try kernel v4.13 and it's the same result.
I trace the code and find it stop at the end of '__init_single_page(page, pfn, zone, nid)' in memmap_init_zone() of mm/page_alloc.c ?
static void __meminit __init_single_page(struct page *page, unsigned long pfn,
unsigned long zone, int nid)
{
set_page_links(page, zone, nid, pfn);
init_page_count(page);
page_mapcount_reset(page);
page_cpupid_reset_last(page);
INIT_LIST_HEAD(&page->lru);
#ifdef WANT_PAGE_VIRTUAL
/* The shift won't overflow because ZONE_NORMAL is below 4G. */
if (!is_highmem_idx(zone))
set_page_address(page, __va(pfn << PAGE_SHIFT));
#endif
// printk("stop here\n");
}
Anyone can give me advice?
Thanks,
Bixuan Cui
^ permalink raw reply [flat|nested] 6+ messages in thread* 【BUG】The kernel start fail when enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL
@ 2017-10-17 5:54 ` Bixuan Cui
0 siblings, 0 replies; 6+ messages in thread
From: Bixuan Cui @ 2017-10-17 5:54 UTC (permalink / raw)
To: linux-kernel; +Cc: linux-arm-kernel, Libin (Huawei)
Hi,
I try to start the kernel(v4.14.0-rc4) by qemu while enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL(use arch/arm64/configs/defconfig) at the same time. Then
it hang:
qemu-system-aarch64 -kernel Image -m 2048 -smp 8 -initrd qemu-le.rootfs -cpu cortex-a57 -nographic -machine virt,kernel_irqchip=on -append 'console=ttyAMA0 root=/dev/ram rdinit=/sbin/init nohz_full=1 earlycon=pl011,0x9000000' -rtc base=localtime -device virtio-net-device,netdev=net0 -netdev type=tap,id=net0,script=no,downscript=no,ifname=tap2
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.14.0-rc4 #24 SMP PREEMPT Mon Oct 16 11:02:11 CST 2017
[ 0.000000] Boot CPU: AArch64 Processor [411fd070]
[ 0.000000] Machine model: linux,dummy-virt
[ 0.000000] earlycon: pl11 at MMIO 0x0000000009000000 (options '')
[ 0.000000] bootconsole [pl11] enabled
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] cma: Reserved 64 MiB at 0x00000000bc000000
After I try kernel v4.13 and it's the same result.
I trace the code and find it stop at the end of '__init_single_page(page, pfn, zone, nid)' in memmap_init_zone() of mm/page_alloc.c ：
static void __meminit __init_single_page(struct page *page, unsigned long pfn,
unsigned long zone, int nid)
{
set_page_links(page, zone, nid, pfn);
init_page_count(page);
page_mapcount_reset(page);
page_cpupid_reset_last(page);
INIT_LIST_HEAD(&page->lru);
#ifdef WANT_PAGE_VIRTUAL
/* The shift won't overflow because ZONE_NORMAL is below 4G. */
if (!is_highmem_idx(zone))
set_page_address(page, __va(pfn << PAGE_SHIFT));
#endif
// printk("stop here\n");
}
Anyone can give me advice?
Thanks,
Bixuan Cui
^ permalink raw reply [flat|nested] 6+ messages in thread* 【BUG】The kernel start fail when enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL
2017-10-17 5:54 ` Bixuan Cui
@ 2017-10-17 11:02 ` Mark Rutland
-1 siblings, 0 replies; 6+ messages in thread
From: Mark Rutland @ 2017-10-17 11:02 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Oct 17, 2017 at 01:54:35PM +0800, Bixuan Cui wrote:
> Hi,
Hi,
> I try to start the kernel(v4.14.0-rc4) by qemu while enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL(use arch/arm64/configs/defconfig) at the same time. Then
> it hang:
> qemu-system-aarch64 -kernel Image -m 2048 -smp 8 -initrd qemu-le.rootfs -cpu cortex-a57 -nographic -machine virt,kernel_irqchip=on -append 'console=ttyAMA0 root=/dev/ram rdinit=/sbin/init nohz_full=1 earlycon=pl011,0x9000000' -rtc base=localtime -device virtio-net-device,netdev=net0 -netdev type=tap,id=net0,script=no,downscript=no,ifname=tap2
> [ 0.000000] Booting Linux on physical CPU 0x0
> [ 0.000000] Linux version 4.14.0-rc4 #24 SMP PREEMPT Mon Oct 16 11:02:11 CST 2017
> [ 0.000000] Boot CPU: AArch64 Processor [411fd070]
> [ 0.000000] Machine model: linux,dummy-virt
> [ 0.000000] earlycon: pl11 at MMIO 0x0000000009000000 (options '')
> [ 0.000000] bootconsole [pl11] enabled
> [ 0.000000] efi: Getting EFI parameters from FDT:
> [ 0.000000] efi: UEFI not found.
> [ 0.000000] cma: Reserved 64 MiB at 0x00000000bc000000
This is a known issue [1,2] that's being worked on at the moment.
The problem is that the out-of-line LL/SC atomics are built with a
special ABI, but KCOV inserts calls to other code that does not follow
this ABI, resulting in register corruption.
When I saw this happen, this resulted in cmpxchg() spuriously failing
somewhere in the page init code, which looks similar to what you're
seeing.
The patch at [1] is sufficient to work around this for the time being.
Thanks,
Mark.
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-September/533105.html
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/537018.html
>
> After I try kernel v4.13 and it's the same result.
> I trace the code and find it stop at the end of '__init_single_page(page, pfn, zone, nid)' in memmap_init_zone() of mm/page_alloc.c ?
>
> static void __meminit __init_single_page(struct page *page, unsigned long pfn,
> unsigned long zone, int nid)
> {
> set_page_links(page, zone, nid, pfn);
> init_page_count(page);
> page_mapcount_reset(page);
> page_cpupid_reset_last(page);
>
> INIT_LIST_HEAD(&page->lru);
>
> #ifdef WANT_PAGE_VIRTUAL
> /* The shift won't overflow because ZONE_NORMAL is below 4G. */
> if (!is_highmem_idx(zone))
> set_page_address(page, __va(pfn << PAGE_SHIFT));
> #endif
> // printk("stop here\n");
> }
>
> Anyone can give me advice?
>
> Thanks,
> Bixuan Cui
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: 【BUG】The kernel start fail when enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL
@ 2017-10-17 11:02 ` Mark Rutland
0 siblings, 0 replies; 6+ messages in thread
From: Mark Rutland @ 2017-10-17 11:02 UTC (permalink / raw)
To: Bixuan Cui; +Cc: linux-kernel, Libin (Huawei), linux-arm-kernel
On Tue, Oct 17, 2017 at 01:54:35PM +0800, Bixuan Cui wrote:
> Hi,
Hi,
> I try to start the kernel(v4.14.0-rc4) by qemu while enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL(use arch/arm64/configs/defconfig) at the same time. Then
> it hang:
> qemu-system-aarch64 -kernel Image -m 2048 -smp 8 -initrd qemu-le.rootfs -cpu cortex-a57 -nographic -machine virt,kernel_irqchip=on -append 'console=ttyAMA0 root=/dev/ram rdinit=/sbin/init nohz_full=1 earlycon=pl011,0x9000000' -rtc base=localtime -device virtio-net-device,netdev=net0 -netdev type=tap,id=net0,script=no,downscript=no,ifname=tap2
> [ 0.000000] Booting Linux on physical CPU 0x0
> [ 0.000000] Linux version 4.14.0-rc4 #24 SMP PREEMPT Mon Oct 16 11:02:11 CST 2017
> [ 0.000000] Boot CPU: AArch64 Processor [411fd070]
> [ 0.000000] Machine model: linux,dummy-virt
> [ 0.000000] earlycon: pl11 at MMIO 0x0000000009000000 (options '')
> [ 0.000000] bootconsole [pl11] enabled
> [ 0.000000] efi: Getting EFI parameters from FDT:
> [ 0.000000] efi: UEFI not found.
> [ 0.000000] cma: Reserved 64 MiB at 0x00000000bc000000
This is a known issue [1,2] that's being worked on at the moment.
The problem is that the out-of-line LL/SC atomics are built with a
special ABI, but KCOV inserts calls to other code that does not follow
this ABI, resulting in register corruption.
When I saw this happen, this resulted in cmpxchg() spuriously failing
somewhere in the page init code, which looks similar to what you're
seeing.
The patch at [1] is sufficient to work around this for the time being.
Thanks,
Mark.
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-September/533105.html
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/537018.html
>
> After I try kernel v4.13 and it's the same result.
> I trace the code and find it stop at the end of '__init_single_page(page, pfn, zone, nid)' in memmap_init_zone() of mm/page_alloc.c ：
>
> static void __meminit __init_single_page(struct page *page, unsigned long pfn,
> unsigned long zone, int nid)
> {
> set_page_links(page, zone, nid, pfn);
> init_page_count(page);
> page_mapcount_reset(page);
> page_cpupid_reset_last(page);
>
> INIT_LIST_HEAD(&page->lru);
>
> #ifdef WANT_PAGE_VIRTUAL
> /* The shift won't overflow because ZONE_NORMAL is below 4G. */
> if (!is_highmem_idx(zone))
> set_page_address(page, __va(pfn << PAGE_SHIFT));
> #endif
> // printk("stop here\n");
> }
>
> Anyone can give me advice?
>
> Thanks,
> Bixuan Cui
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 6+ messages in thread* 【BUG】The kernel start fail when enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL
2017-10-17 11:02 ` Mark Rutland
@ 2017-10-17 12:42 ` Bixuan Cui
-1 siblings, 0 replies; 6+ messages in thread
From: Bixuan Cui @ 2017-10-17 12:42 UTC (permalink / raw)
To: linux-arm-kernel
> This is a known issue [1,2] that's being worked on at the moment.
>
> The problem is that the out-of-line LL/SC atomics are built with a
> special ABI, but KCOV inserts calls to other code that does not follow
> this ABI, resulting in register corruption.
>
> When I saw this happen, this resulted in cmpxchg() spuriously failing
> somewhere in the page init code, which looks similar to what you're
> seeing.
>
> The patch at [1] is sufficient to work around this for the time being.
Thank you for your explanation :-D .
Thanks,
Bixuan Cui
>
> Thanks,
> Mark.
>
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-September/533105.html
> [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/537018.html
>
>>
>> After I try kernel v4.13 and it's the same result.
>> I trace the code and find it stop at the end of '__init_single_page(page, pfn, zone, nid)' in memmap_init_zone() of mm/page_alloc.c ?
>>
>> static void __meminit __init_single_page(struct page *page, unsigned long pfn,
>> unsigned long zone, int nid)
>> {
>> set_page_links(page, zone, nid, pfn);
>> init_page_count(page);
>> page_mapcount_reset(page);
>> page_cpupid_reset_last(page);
>>
>> INIT_LIST_HEAD(&page->lru);
>>
>> #ifdef WANT_PAGE_VIRTUAL
>> /* The shift won't overflow because ZONE_NORMAL is below 4G. */
>> if (!is_highmem_idx(zone))
>> set_page_address(page, __va(pfn << PAGE_SHIFT));
>> #endif
>> // printk("stop here\n");
>> }
>>
>> Anyone can give me advice?
>>
>> Thanks,
>> Bixuan Cui
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
> .
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: 【BUG】The kernel start fail when enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL
@ 2017-10-17 12:42 ` Bixuan Cui
0 siblings, 0 replies; 6+ messages in thread
From: Bixuan Cui @ 2017-10-17 12:42 UTC (permalink / raw)
To: Mark Rutland; +Cc: linux-kernel, Libin (Huawei), linux-arm-kernel
> This is a known issue [1,2] that's being worked on at the moment.
>
> The problem is that the out-of-line LL/SC atomics are built with a
> special ABI, but KCOV inserts calls to other code that does not follow
> this ABI, resulting in register corruption.
>
> When I saw this happen, this resulted in cmpxchg() spuriously failing
> somewhere in the page init code, which looks similar to what you're
> seeing.
>
> The patch at [1] is sufficient to work around this for the time being.
Thank you for your explanation :-D .
Thanks,
Bixuan Cui
>
> Thanks,
> Mark.
>
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-September/533105.html
> [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/537018.html
>
>>
>> After I try kernel v4.13 and it's the same result.
>> I trace the code and find it stop at the end of '__init_single_page(page, pfn, zone, nid)' in memmap_init_zone() of mm/page_alloc.c ：
>>
>> static void __meminit __init_single_page(struct page *page, unsigned long pfn,
>> unsigned long zone, int nid)
>> {
>> set_page_links(page, zone, nid, pfn);
>> init_page_count(page);
>> page_mapcount_reset(page);
>> page_cpupid_reset_last(page);
>>
>> INIT_LIST_HEAD(&page->lru);
>>
>> #ifdef WANT_PAGE_VIRTUAL
>> /* The shift won't overflow because ZONE_NORMAL is below 4G. */
>> if (!is_highmem_idx(zone))
>> set_page_address(page, __va(pfn << PAGE_SHIFT));
>> #endif
>> // printk("stop here\n");
>> }
>>
>> Anyone can give me advice?
>>
>> Thanks,
>> Bixuan Cui
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
> .
>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2017-10-17 12:45 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2017-10-17 5:54 【BUG】The kernel start fail when enable CONFIG_ARM64_LSE_ATOMICS and KCOV_INSTRUMENT_ALL Bixuan Cui
2017-10-17 5:54 ` Bixuan Cui
2017-10-17 11:02 ` Mark Rutland
2017-10-17 11:02 ` Mark Rutland
2017-10-17 12:42 ` Bixuan Cui
2017-10-17 12:42 ` Bixuan Cui
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