Home » Mailing lists » Devel » utrace regressions (was: -mm merge plans for 2.6.21)
| utrace regressions (was: -mm merge plans for 2.6.21) [message #10195] |
Mon, 12 February 2007 12:47  |
adobriyan
Messages: 80
Registered: November 2006
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Member |
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> utrace-utrace-tracehook.patch
> utrace-utrace-tracehook-ia64.patch
> utrace-utrace-tracehook-sparc64.patch
> utrace-utrace-tracehook-s390.patch
> utrace-utrace-regset.patch
> utrace-utrace-regset-ia64.patch
> utrace-utrace-regset-sparc64.patch
> utrace-utrace-regset-s390.patch
> utrace-utrace-core.patch
> utrace-utrace-ptrace-compat.patch
> utrace-utrace-ptrace-compat-ia64.patch
> utrace-utrace-ptrace-compat-sparc64.patch
> utrace-utrace-ptrace-compat-s390.patch
> utrace just got added to -mm.
We're aware of two regressions compared to mainline if ptrace is utrace:
1) zero holes for PTRACE_PEEKUSR vanished.
strace(1) when sees unknown syscall, does something like:
for (i = 0; i < MAX_ARGS; i++)
if (ptrace(PTRACE_PEEKUSR, i * 4, ...) < 0)
return -1;
since THREAD_SIZE is 17 on x86 which is less that MAX_ARGS (32 on
x86), you'll get -EIO(utrace) or 0(ptrace) when i=0.
No new syscalls stracing for developers.
Proposed patch:
--- a/arch/i386/kernel/ptrace.c
+++ b/arch/i386/kernel/ptrace.c
@@ -728,6 +728,7 @@ EXPORT_SYMBOL_GPL(utrace_i386_native);
#ifdef CONFIG_PTRACE
static const struct ptrace_layout_segment i386_uarea[] = {
{0, FRAME_SIZE*4, 0, 0},
+ {FRAME_SIZE*4, offsetof(struct user, u_debugreg[0]), -1, 0},
{offsetof(struct user, u_debugreg[0]),
offsetof(struct user, u_debugreg[8]), 4, 0},
{0, 0, -1, 0}
Looks like x86_64 also needs zero holes added, haven't checked in runtime.
------------------------------------------------------------ -------
2. The following proggie renders box unusable in ~10 seconds (but not
mainline kernel where Ctrl+C will kill process).
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/ptrace.h>
#include <signal.h>
static void *thread_func(void *arg)
{
execl("/proc/self/exe", NULL);
return NULL;
}
int main(int argc, const char *argv[])
{
pthread_t thread;
int pid, n;
if (argv[0] && (pid = fork()))
for (n = 1; /*n < 1000000*/; ++n) {
ptrace(PTRACE_ATTACH, pid, NULL, 0);
ptrace(PTRACE_DETACH, pid, NULL, 0);
if (!(n % 100000))
printf("passed: %d\n", n);
}
if (pthread_create(&thread, NULL, thread_func, NULL))
perror("pthread_create");
while (1)
pause();
return 1;
}
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| Re: utrace regressions (was: -mm merge plans for 2.6.21) [message #10239 is a reply to message #10229] |
Tue, 13 February 2007 13:05  |
adobriyan
Messages: 80
Registered: November 2006
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Member |
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On Mon, Feb 12, 2007 at 01:36:34PM -0800, Roland McGrath wrote:
> > 2. The following proggie renders box unusable in ~10 seconds (but not
> > mainline kernel where Ctrl+C will kill process).
>
> I haven't been able to reproduce this so far on my test machine. I got
> bored after about 10 minutes ("passed: 119200000"). The machine remains
> responsive and the test dies immediately on hitting C-c. I'll try it on
> some other machines. It would help to know what kind of unusable (crashy,
> leaky, wedgey?).
This is fresh pull 2.6.20-ec2f9d1331f658433411c58077871e1eef4ee1b4 with
linux-2.6.20-current-utrace.patch slapped on top (without rejects)
utrace is on and ptrace is on too.
the behaviour is
$ expl_ptratt
passed: 100000
passed: 200000
...
passed: [always different number, but in several seconds]
[pause]
[OOM killer wakes up steadily killing processes ]
[messages scroll away ]
I'll turn more debugging options now.
Just in case, .config:
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.20
# Tue Feb 13 15:28:38 2007
#
CONFIG_X86_32=y
CONFIG_GENERIC_TIME=y
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_SEMAPHORE_SLEEPERS=y
CONFIG_X86=y
CONFIG_MMU=y
CONFIG_ZONE_DMA=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_IOMAP=y
CONFIG_GENERIC_BUG=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_DMI=y
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
#
# Code maturity level options
#
CONFIG_EXPERIMENTAL=y
CONFIG_BROKEN_ON_SMP=y
CONFIG_INIT_ENV_ARG_LIMIT=32
#
# General setup
#
CONFIG_LOCALVERSION=""
# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_IPC_NS=y
# CONFIG_POSIX_MQUEUE is not set
# CONFIG_BSD_PROCESS_ACCT is not set
# CONFIG_TASKSTATS is not set
CONFIG_UTS_NS=y
# CONFIG_AUDIT is not set
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
# CONFIG_SYSFS_DEPRECATED is not set
# CONFIG_RELAY is not set
# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
CONFIG_SYSCTL=y
# CONFIG_EMBEDDED is not set
CONFIG_UID16=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
# CONFIG_KALLSYMS_EXTRA_PASS is not set
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SHMEM=y
CONFIG_SLAB=y
CONFIG_VM_EVENT_COUNTERS=y
CONFIG_RT_MUTEXES=y
# CONFIG_TINY_SHMEM is not set
CONFIG_BASE_SMALL=0
# CONFIG_SLOB is not set
#
# Loadable module support
#
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
# CONFIG_MODULE_FORCE_UNLOAD is not set
# CONFIG_MODVERSIONS is not set
# CONFIG_MODULE_SRCVERSION_ALL is not set
CONFIG_KMOD=y
#
# Process debugging support
#
CONFIG_UTRACE=y
CONFIG_PTRACE=y
#
# Block layer
#
CONFIG_BLOCK=y
# CONFIG_LBD is not set
# CONFIG_BLK_DEV_IO_TRACE is not set
# CONFIG_LSF is not set
#
# IO Schedulers
#
CONFIG_IOSCHED_NOOP=y
# CONFIG_IOSCHED_AS is not set
# CONFIG_IOSCHED_DEADLINE is not set
CONFIG_IOSCHED_CFQ=y
# CONFIG_DEFAULT_AS is not set
# CONFIG_DEFAULT_DEADLINE is not set
CONFIG_DEFAULT_CFQ=y
# CONFIG_DEFAULT_NOOP is not set
CONFIG_DEFAULT_IOSCHED="cfq"
#
# Processor type and features
#
# CONFIG_SMP is not set
CONFIG_X86_PC=y
# CONFIG_X86_ELAN is not set
# CONFIG_X86_VOYAGER is not set
# CONFIG_X86_NUMAQ is not set
# CONFIG_X86_SUMMIT is not set
# CONFIG_X86_BIGSMP is not set
# CONFIG_X86_VISWS is not set
# CONFIG_X86_GENERICARCH is not set
# CONFIG_X86_ES7000 is not set
# CONFIG_PARAVIRT is not set
# CONFIG_M386 is not set
# CONFIG_M486 is not set
# CONFIG_M586 is not set
# CONFIG_M586TSC is not set
# CONFIG_M586MMX is not set
# CONFIG_M686 is not set
# CONFIG_MPENTIUMII is not set
# CONFIG_MPENTIUMIII is not set
# CONFIG_MPENTIUMM is not set
# CONFIG_MCORE2 is not set
CONFIG_MPENTIUM4=y
# CONFIG_MK6 is not set
# CONFIG_MK7 is not set
# CONFIG_MK8 is not set
# CONFIG_MCRUSOE is not set
# CONFIG_MEFFICEON is not set
# CONFIG_MWINCHIPC6 is not set
# CONFIG_MWINCHIP2 is not set
# CONFIG_MWINCHIP3D is not set
# CONFIG_MGEODEGX1 is not set
# CONFIG_MGEODE_LX is not set
# CONFIG_MCYRIXIII is not set
# CONFIG_MVIAC3_2 is not set
# CONFIG_X86_GENERIC is not set
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_L1_CACHE_SHIFT=7
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
# CONFIG_ARCH_HAS_ILOG2_U32 is not set
# CONFIG_ARCH_HAS_ILOG2_U64 is not set
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_CMPXCHG64=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_TSC=y
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
# CONFIG_X86_UP_APIC is not set
CONFIG_X86_MCE=y
CONFIG_X86_MCE_NONFATAL=y
CONFIG_VM86=y
# CONFIG_TOSHIBA is not set
# CONFIG_I8K is not set
# CONFIG_X86_REBOOTFIXUPS is not set
# CONFIG_MICROCODE is not set
CONFIG_X86_MSR=m
CONFIG_X86_CPUID=m
#
# Firmware Drivers
#
# CONFIG_EDD is not set
# CONFIG_DELL_RBU is not set
# CONFIG_DCDBAS is not set
# CONFIG_NOHIGHMEM is not set
CONFIG_HIGHMEM4G=y
# CONFIG_HIGHMEM64G is not set
CONFIG_PAGE_OFFSET=0xC0000000
CONFIG_HIGHMEM=y
CONFIG_ARCH_FLATMEM_ENABLE=y
CONFIG_ARCH_SPARSEMEM_ENABLE=y
CONFIG_ARCH_SELECT_MEMORY_MODEL=y
CONFIG_ARCH_POPULATES_NODE_MAP=y
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
# CONFIG_DISCONTIGMEM_MANUAL is not set
# CONFIG_SPARSEMEM_MANUAL is not set
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
CONFIG_SPARSEMEM_STATIC=y
CONFIG_SPLIT_PTLOCK_CPUS=4
# CONFIG_RESOURCES_64BIT is not set
CONFIG_ZONE_DMA_FLAG=1
CONFIG_HIGHPTE=y
# CONFIG_MATH_EMULATION is not set
CONFIG_MTRR=y
# CONFIG_EFI is not set
# CONFIG_SECCOMP is not set
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
# CONFIG_HZ_300 is not set
# CONFIG_HZ_1000 is not set
CONFIG_HZ=250
# CONFIG_KEXEC is not set
# CONFIG_CRASH_DUMP is not set
CONFIG_PHYSICAL_START=0x100000
# CONFIG_RELOCATABLE is not set
CONFIG_PHYSICAL_ALIGN=0x100000
# CONFIG_COMPAT_VDSO is not set
CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
#
# Power management options (ACPI, APM)
#
CONFIG_PM=y
# CONFIG_PM_LEGACY is not set
# CONFIG_PM_DEBUG is not set
# CONFIG_PM_SYSFS_DEPRECATED is not set
# CONFIG_SOFTWARE_SUSPEND is not set
#
# ACPI (Advanced Configuration and Power Interface) Support
#
CONFIG_ACPI=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_SLEEP_PROC_FS=y
# CONFIG_ACPI_SLEEP_PROC_SLEEP is not set
# CONFIG_ACPI_PROCFS is not set
# CONFIG_ACPI_AC is not set
# CONFIG_ACPI_BATTERY is not set
CONFIG_ACPI_BUTTON=m
CONFIG_ACPI_HOTKEY=m
CONFIG_ACPI_FAN=m
# CONFIG_ACPI_DOCK is not set
# CONFIG_ACPI_BAY is not set
# CONFIG_ACPI_PROCESSOR is not set
# CONFIG_ACPI_ASUS is not set
# CONFIG_ACPI_IBM is not set
# CONFIG_ACPI_TOSHIBA is not set
CONFIG_ACPI_BLACKLIST_YEAR=0
# CONFIG_ACPI_DEBUG is not set
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_SYSTEM=y
CONFIG_X86_PM_TIMER=y
# CONFIG_ACPI_CONTAINER is not set
#
# APM (Advanced Power Management) BIOS Support
#
# CONFIG_APM is not set
#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=y
# CONFIG_CPU_FREQ_DEBUG is not set
CONFIG_CPU_FREQ_STAT=y
# CONFIG_CPU_FREQ_STAT_DETAILS is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_GOV_POWERSAVE is not set
# CONFIG_CPU_FREQ_GOV_USERSPACE is not set
# CONFIG_CPU_FREQ_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set
#
# CPUFreq processor drivers
#
# CONFIG_X86_POWERNOW_K6 is not set
# CONFIG_X86_POWERNOW_K7 is not set
# CONFIG_X86_POWERNOW_K8 is not set
# CONFIG_X86_GX_SUSPMOD is not set
# CONFIG_X86_SPEEDSTEP_CENTRINO is not set
# CONFIG_X86_SPEEDSTEP_ICH is not set
# CONFIG_X86_SPEEDSTEP_SMI is not set
CONFIG_X86_P4_CLOCKMOD=m
# CONFIG_X86_CPUFREQ_NFORCE2 is not set
# CONFIG_X86_LONGRUN is not set
#
# shared options
#
CONFIG_X86_SPEEDSTEP_LIB=m
#
# Bus options (PCI, PCMCIA, EISA, MCA, ISA)
#
CONFIG_PCI=y
# CONFIG_PCI_GOBIOS is not set
# CONFIG_PCI_GOMMCONFIG is not set
# CONFIG_PCI_GODIRECT is not set
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_PCI_MMCONFIG=y
# CONFIG_PCIEPORTBUS is not set
# CONFIG_PCI_DEBUG is not set
CONFIG_ISA_DMA_API=y
# CONFIG_ISA is not set
# CONFIG_MCA is not set
# CONFIG_SCx200 is not set
#
# PCCARD (PCMCIA/CardBus) support
#
# CONFIG_PCCARD is not set
#
# PCI Hotplug Support
#
# CONFIG_HOTPLUG_PCI is not set
#
# Executable file formats
#
CONFIG_BINFMT_ELF=y
# CONFIG_BINFMT_AOUT is not set
# CONFIG_BINFMT_MISC is not set
#
# Networking
#
CONFIG_NET=y
#
# Networking options
#
# CONFIG_NETDEBUG is not set
CONFIG_PACKET=m
CONFIG_PACKET_MMAP=y
CONFIG_UNIX=y
# CONFIG_NET_KEY is not set
CONFIG_INET=y
# CONFIG_IP_MULTICAST is not set
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_ASK_IP_FIB_HASH=y
# CONFIG_IP_FIB_TRIE is not set
CONFIG_IP_FIB_HASH=y
CONFIG_IP_MULTIPLE_TABLES=y
CONFIG_IP_ROUTE_MULTIPATH=y
# CONFIG_IP_ROUTE_MULTIPATH_CACHED is not set
CONFIG_IP_ROUTE_VERBOSE=y
# CONFIG_IP_PNP is not set
CONFIG_NET_IPIP=m
CONFIG_NET_IPGRE=m
# CONFIG_ARPD is not set
CONFIG_SYN_COOKIES=y
# CONFIG_INET_AH is not set
# CONFIG_INET_ESP is not set
# CONFIG_INET_IPCOMP is not set
# CONFIG_INET_XFRM_TUNNEL is not set
CONFIG_INET_TUNNEL=m
# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
# CONFIG_INET_XFRM_MODE_TUNNEL is not set
# CONFIG_INET_XFRM_MODE_BEET is not set
CONFIG_INET_DIAG=y
CONFIG_INET_TCP_DIAG=y
# CONFIG_TCP_CONG_ADVANCED is not set
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
# CONFIG_TCP_MD5SIG is not set
#
# IP: Virtual Server Configuration
#
# CONFIG_IP_VS is not set
# CONFIG_IPV6 is not set
# CONFIG_INET6_XFRM_TUNNEL is not set
# CONFIG_INET6_TUNNEL is not set
# CONFIG_NETWORK_SECMARK is not set
CONFIG_NETFILTER=y
# CONFIG_NETFILTER_DEBUG is not set
#
# Core Netfilter Configuration
#
# CONFIG_NETFILTER_NETLINK is not set
# CONFIG_NF_CONNTRACK_ENABLED is not set
CONFIG_NETFILTER_XTABLES=m
# CONFIG_NETFILTER_XT_TARGET_CLASSIFY is not se
...
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| Re: utrace regressions (was: -mm merge plans for 2.6.21) [message #10247 is a reply to message #10229] |
Tue, 13 February 2007 15:28 |
adobriyan
Messages: 80
Registered: November 2006
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Member |
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On Mon, Feb 12, 2007 at 01:36:34PM -0800, Roland McGrath wrote:
> > We're aware of two regressions compared to mainline if ptrace is utrace:
>
> Thanks very much for bringing these to my attention.
>
> > 1) zero holes for PTRACE_PEEKUSR vanished.
>
> I've fixed this in the current patches.
Looking at mainline x86_64 ptrace code I think hole for u_debugreg[4]
and [5] is also needed.
--- a/arch/x86_64/kernel/ptrace.c
+++ b/arch/x86_64/kernel/ptrace.c
@@ -687,6 +687,8 @@ EXPORT_SYMBOL_GPL(utrace_x86_64_native);
#ifdef CONFIG_PTRACE
static const struct ptrace_layout_segment x86_64_uarea[] = {
{0, sizeof(struct user_regs_struct), 0, 0},
+ {sizeof(struct user_regs_struct),
+ offsetof(struct user, u_debugreg[0]), -1, 0},
{offsetof(struct user, u_debugreg[0]),
offsetof(struct user, u_debugreg[4]), 3, 0},
{offsetof(struct user, u_debugreg[6]),
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| Re: utrace regressions (was: -mm merge plans for 2.6.21) [message #10340 is a reply to message #10239] |
Thu, 15 February 2007 12:02 |
adobriyan
Messages: 80
Registered: November 2006
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Member |
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On Tue, Feb 13, 2007 at 04:05:30PM +0300, Alexey Dobriyan wrote:
> On Mon, Feb 12, 2007 at 01:36:34PM -0800, Roland McGrath wrote:
> > > 2. The following proggie renders box unusable in ~10 seconds (but not
> > > mainline kernel where Ctrl+C will kill process).
> >
> > I haven't been able to reproduce this so far on my test machine. I got
> > bored after about 10 minutes ("passed: 119200000"). The machine remains
> > responsive and the test dies immediately on hitting C-c. I'll try it on
> > some other machines. It would help to know what kind of unusable (crashy,
> > leaky, wedgey?).
>
> This is fresh pull 2.6.20-ec2f9d1331f658433411c58077871e1eef4ee1b4 with
> linux-2.6.20-current-utrace.patch slapped on top (without rejects)
> utrace is on and ptrace is on too.
>
> the behaviour is
>
> $ expl_ptratt
> passed: 100000
> passed: 200000
> ...
> passed: [always different number, but in several seconds]
> [pause]
> [OOM killer wakes up steadily killing processes ]
> [messages scroll away ]
>
> I'll turn more debugging options now.
>
> Just in case, .config:
Turning preempt off makes OOM-killings dissapear.
> # CONFIG_PREEMPT_NONE is not set
> CONFIG_PREEMPT_VOLUNTARY=y
> # CONFIG_PREEMPT is not set
> # CONFIG_X86_UP_APIC is not set
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| Re: utrace regressions (was: -mm merge plans for 2.6.21) [message #10545 is a reply to message #10399] |
Wed, 21 February 2007 13:30 |
adobriyan
Messages: 80
Registered: November 2006
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Member |
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On Sat, Feb 17, 2007 at 06:35:31PM -0800, Roland McGrath wrote:
> > Looking at mainline x86_64 ptrace code I think hole for u_debugreg[4]
> > and [5] is also needed.
>
> It's not. The utrace_regset for the debugregs already has that behavior
> for those two words, so mapping all 8 uarea words to the regset is fine.
Sorry, I don't get it. Choosing segment from x86_64_uarea is done before
calling regset->set and regset->get as well as before zero-filling. No
segment for u_debugreg[4] and [5] means -EIO before segment handlers
will have a chance to be called.
Do you want to consolidate these two?
{offsetof(struct user, u_debugreg[0]), offsetof(struct user, u_debugreg[4]), 3, 0},
{offsetof(struct user, u_debugreg[6]), offsetof(struct user, u_debugreg[8]), 3, 6 * sizeof(long)},
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| Re: utrace regressions (was: -mm merge plans for 2.6.21) [message #10921 is a reply to message #10545] |
Wed, 07 March 2007 09:10 |
Roland McGrath
Messages: 7
Registered: February 2007
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Junior Member |
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> On Sat, Feb 17, 2007 at 06:35:31PM -0800, Roland McGrath wrote:
> > > Looking at mainline x86_64 ptrace code I think hole for u_debugreg[4]
> > > and [5] is also needed.
> >
> > It's not. The utrace_regset for the debugregs already has that behavior
> > for those two words, so mapping all 8 uarea words to the regset is fine.
>
> Sorry, I don't get it. Choosing segment from x86_64_uarea is done before
> calling regset->set and regset->get as well as before zero-filling. No
> segment for u_debugreg[4] and [5] means -EIO before segment handlers
> will have a chance to be called.
>
> Do you want to consolidate these two?
>
> {offsetof(struct user, u_debugreg[0]), offsetof(struct user, u_debugreg[4]), 3, 0},
> {offsetof(struct user, u_debugreg[6]), offsetof(struct user, u_debugreg[8]), 3, 6 * sizeof(long)},
Oops! I was misremembering what was in x86_64_uarea when I wrote that.
I've indeed fixed it to match what I thought it was:
{offsetof(struct user, u_debugreg[0]),
offsetof(struct user, u_debugreg[8]), 3, 0},
Thanks,
Roland
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