* kernel panic w/ __get_user_pages_fast in 2.6.32-358.6.2
@ 2014-01-15 3:54 Dennis
2014-01-21 17:55 ` Dennis
0 siblings, 1 reply; 4+ messages in thread
From: Dennis @ 2014-01-15 3:54 UTC (permalink / raw)
To: linux-perf-users
Hi,
(x86_64 / Xeon / perf-2.6.32-358.6.2)
The "-a" flag with perf record (and most friends except top) on RHEL
6.1 and 6.3 seems to cause a kernel panic on Intel Xeon- 12 and 24
core systems (only ones I tried so far).
After about 1 second workstation completely freezes and then after
maybe 10 seconds I see a panic.
Since I realize I am probably using an ancient version of perf I am
more trying to solicit some speculation or gather whether this is
already a known issue with this particular software/hardware,
backtrace combination?
In the back trace the RIP points to __get_user_pages_fast, but I am
unsure how to go further.
Neither the perf-user archives or the git commit logs seem too helpful
to me about this function as a keyword to search for.
(http://article.gmane.org/gmane.linux.kernel.perf.user/665/match=__get_user_pages_fast
-returns a thread but on PPC not x86.
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=__get_user_pages_fast
I can't tell if any of the commit messages would fix this. However, I
don't know what, "this" actually is or what's broken really.
This is a back trace (of the 3 cores the RIP is in
__get_user_pages_fast, different process every time.
crash > log | grep BUG
"BUG: unable to handle kernel NULL pointer dereference at 0000000000000050"
crash> bt
PID: 7558 TASK: ffff8801993614c0 CPU: 1 COMMAND: "fprintd"
#0 [ffff88020bbef720] machine_kexec at ffffffff810310cb
#1 [ffff88020bbef780] crash_kexec at ffffffff810b6312
#2 [ffff88020bbef850] oops_end at ffffffff814de190
#3 [ffff88020bbef880] no_context at ffffffff81040c9b
#4 [ffff88020bbef8d0] __bad_area_nosemaphore at ffffffff81040f25
#5 [ffff88020bbef920] bad_area_nosemaphore at ffffffff81040ff3
#6 [ffff88020bbef930] __do_page_fault at ffffffff810416cd
#7 [ffff88020bbefa50] do_page_fault at ffffffff814e017e
#8 [ffff88020bbefa80] page_fault at ffffffff814dd525
[exception RIP: __get_user_pages_fast+156]
RIP: ffffffff810464dc RSP: ffff88020bbefb38 RFLAGS: 00010046
RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff88020bbeffd8
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88020bbefb98 R8: ffff880028220000 R9: ffff88020bbefcf8
R10: ffff88020bbefde8 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000001000 R14: 0000008000000000 R15: 0000000000000fff
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#9 [ffff88020bbefba0] copy_from_user_nmi at ffffffff8101ae31
#10 [ffff88020bbefc00] perf_callchain_user at ffffffff8101b008
#11 [ffff88020bbefc50] perf_prepare_sample at ffffffff81106420
#12 [ffff88020bbefca0] __perf_event_overflow at ffffffff81108b38
#13 [ffff88020bbefd40] perf_swevent_overflow at ffffffff81108cd4
#14 [ffff88020bbefd80] do_perf_sw_event at ffffffff81108ee0
#15 [ffff88020bbefde0] perf_tp_event at ffffffff81108f94
#16 [ffff88020bbefe60] ftrace_profile_templ_sched_process_template at
ffffffff8104d66a
#17 [ffff88020bbefeb0] ftrace_profile_sched_process_exit at ffffffff8104d6d3
#18 [ffff88020bbefec0] do_exit at ffffffff8106c34d
#19 [ffff88020bbeff40] do_group_exit at ffffffff8106c4b8
#20 [ffff88020bbeff70] sys_exit_group at ffffffff8106c547
#21 [ffff88020bbeff80] system_call_fastpath at ffffffff8100b172
RIP: 000000324eeabd98 RSP: 00007fff4b3a55c8 RFLAGS: 00010246
RAX: 00000000000000e7 RBX: ffffffff8100b172 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 0000000000000000 R8: 00000000000000e7 R9: ffffffffffffffa8
R10: 000000324f18e7e8 R11: 0000000000000246 R12: ffffffff8106c547
R13: ffff88020bbeff78 R14: 00000032504e4970 R15: 00000000020a1750
ORIG_RAX: 00000000000000e7 CS: 0033 SS: 002b
"0xffffffff810464dc <__get_user_pages_fast+156>: add
0x50(%rdx),%r12" << what is this doing?
> disassemble __get_user_pages_fast:
0xffffffff81046440 <__get_user_pages_fast+0>: push %rbp
0xffffffff81046441 <__get_user_pages_fast+1>: mov %rsp,%rbp
0xffffffff81046444 <__get_user_pages_fast+4>: push %r15
0xffffffff81046446 <__get_user_pages_fast+6>: push %r14
0xffffffff81046448 <__get_user_pages_fast+8>: push %r13
0xffffffff8104644a <__get_user_pages_fast+10>: push %r12
0xffffffff8104644c <__get_user_pages_fast+12>: push %rbx
0xffffffff8104644d <__get_user_pages_fast+13>: sub $0x38,%rsp
0xffffffff81046451 <__get_user_pages_fast+17>: nopl 0x0(%rax,%rax,1)
0xffffffff81046456 <__get_user_pages_fast+22>: mov %gs:0xcc00,%rax
0xffffffff8104645f <__get_user_pages_fast+31>: and $0xfffffffffffff000,%rdi
0xffffffff81046466 <__get_user_pages_fast+38>: movslq %esi,%r13
0xffffffff81046469 <__get_user_pages_fast+41>: mov %rcx,-0x50(%rbp)
0xffffffff8104646d <__get_user_pages_fast+45>: mov %edx,-0x44(%rbp)
0xffffffff81046470 <__get_user_pages_fast+48>: shl $0xc,%r13
0xffffffff81046474 <__get_user_pages_fast+52>: mov 0x480(%rax),%rdx
0xffffffff8104647b <__get_user_pages_fast+59>: mov %gs:0xcc08,%rcx
0xffffffff81046484 <__get_user_pages_fast+68>: movl $0x0,-0x34(%rbp)
0xffffffff8104648b <__get_user_pages_fast+75>: mov %rdi,%rax
0xffffffff8104648e <__get_user_pages_fast+78>: add %r13,%rax
0xffffffff81046491 <__get_user_pages_fast+81>: sbb %rbx,%rbx
0xffffffff81046494 <__get_user_pages_fast+84>: cmp %rax,-0x1fb8(%rcx)
0xffffffff8104649b <__get_user_pages_fast+91>: sbb $0x0,%rbx
0xffffffff8104649f <__get_user_pages_fast+95>: test %rbx,%rbx
0xffffffff810464a2 <__get_user_pages_fast+98>: jne
0xffffffff8104654d <__get_user_pages_fast+269>
0xffffffff810464a8 <__get_user_pages_fast+104>: add %rdi,%r13
0xffffffff810464ab <__get_user_pages_fast+107>: pushfq
0xffffffff810464ac <__get_user_pages_fast+108>: pop %rax
0xffffffff810464ad <__get_user_pages_fast+109>: nopl 0x0(%rax,%rax,1)
0xffffffff810464b2 <__get_user_pages_fast+114>: mov %rax,-0x58(%rbp)
0xffffffff810464b6 <__get_user_pages_fast+118>: cli
0xffffffff810464b7 <__get_user_pages_fast+119>: nopw 0x0(%rax,%rax,1)
0xffffffff810464bd <__get_user_pages_fast+125>: mov %rdi,%r12
0xffffffff810464c0 <__get_user_pages_fast+128>: lea -0x1(%r13),%r15
0xffffffff810464c4 <__get_user_pages_fast+132>: mov %rdi,%rsi
0xffffffff810464c7 <__get_user_pages_fast+135>: shr $0x24,%r12
0xffffffff810464cb <__get_user_pages_fast+139>: mov $0x8000000000,%r14
0xffffffff810464d5 <__get_user_pages_fast+149>: and $0xff8,%r12d
0xffffffff810464dc <__get_user_pages_fast+156>: add 0x50(%rdx),%r12
0xffffffff810464e0 <__get_user_pages_fast+160>: jmp
0xffffffff810464ef <__get_user_pages_fast+175>
0xffffffff810464e2 <__get_user_pages_fast+162>: nopw 0x0(%rax,%rax,1)
0xffffffff810464e8 <__get_user_pages_fast+168>: add $0x8,%r12
0xffffffff810464ec <__get_user_pages_fast+172>: mov %rbx,%rsi
0xffffffff810464ef <__get_user_pages_fast+175>: lea (%rsi,%r14,1),%rbx
0xffffffff810464f3 <__get_user_pages_fast+179>: mov $0xffffff8000000000,%rax
0xffffffff810464fd <__get_user_pages_fast+189>: mov (%r12),%rdi
0xffffffff81046501 <__get_user_pages_fast+193>: and %rax,%rbx
0xffffffff81046504 <__get_user_pages_fast+196>: lea -0x1(%rbx),%rax
0xffffffff81046508 <__get_user_pages_fast+200>: cmp %r15,%rax
0xffffffff8104650b <__get_user_pages_fast+203>: cmovae %r13,%rbx
0xffffffff8104650f <__get_user_pages_fast+207>: test %rdi,%rdi
0xffffffff81046512 <__get_user_pages_fast+210>: je
0xffffffff81046530 <__get_user_pages_fast+240>
0xffffffff81046514 <__get_user_pages_fast+212>: mov -0x50(%rbp),%r8
0xffffffff81046518 <__get_user_pages_fast+216>: mov -0x44(%rbp),%ecx
0xffffffff8104651b <__get_user_pages_fast+219>: lea -0x34(%rbp),%r9
0xffffffff8104651f <__get_user_pages_fast+223>: mov %rbx,%rdx
0xffffffff81046522 <__get_user_pages_fast+226>: callq
0xffffffff810460b0 <gup_pud_range>
0xffffffff81046527 <__get_user_pages_fast+231>: test %eax,%eax
0xffffffff81046529 <__get_user_pages_fast+233>: je
0xffffffff81046530 <__get_user_pages_fast+240>
0xffffffff8104652b <__get_user_pages_fast+235>: cmp %r13,%rbx
0xffffffff8104652e <__get_user_pages_fast+238>: jne
0xffffffff810464e8 <__get_user_pages_fast+168>
0xffffffff81046530 <__get_user_pages_fast+240>: mov -0x58(%rbp),%rdi
0xffffffff81046534 <__get_user_pages_fast+244>: push %rdi
0xffffffff81046535 <__get_user_pages_fast+245>: popfq
0xffffffff81046536 <__get_user_pages_fast+246>: nopl 0x0(%rax,%rax,1)
0xffffffff8104653b <__get_user_pages_fast+251>: mov -0x34(%rbp),%eax
0xffffffff8104653e <__get_user_pages_fast+254>: add $0x38,%rsp
0xffffffff81046542 <__get_user_pages_fast+258>: pop %rbx
0xffffffff81046543 <__get_user_pages_fast+259>: pop %r12
0xffffffff81046545 <__get_user_pages_fast+261>: pop %r13
0xffffffff81046547 <__get_user_pages_fast+263>: pop %r14
0xffffffff81046549 <__get_user_pages_fast+265>: pop %r15
0xffffffff8104654b <__get_user_pages_fast+267>: leaveq
0xffffffff8104654c <__get_user_pages_fast+268>: retq
0xffffffff8104654d <__get_user_pages_fast+269>: xor %eax,%eax
0xffffffff8104654f <__get_user_pages_fast+271>: jmp
0xffffffff8104653e <__get_user_pages_fast+254>
End of assembler dump.
crash>
> whatis __get_user_pages_fast
int __get_user_pages_fast(long unsigned int, int, int, struct page **);
Thank you,
Dennis O.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: kernel panic w/ __get_user_pages_fast in 2.6.32-358.6.2
2014-01-15 3:54 kernel panic w/ __get_user_pages_fast in 2.6.32-358.6.2 Dennis
@ 2014-01-21 17:55 ` Dennis
2014-01-24 0:28 ` Dennis
0 siblings, 1 reply; 4+ messages in thread
From: Dennis @ 2014-01-21 17:55 UTC (permalink / raw)
To: linux-perf-users
Any takers on what might have caused this KP?
Regards,
Dennis O.
On Tue, Jan 14, 2014 at 7:54 PM, Dennis <daodennis@gmail.com> wrote:
> Hi,
>
> (x86_64 / Xeon / perf-2.6.32-358.6.2)
>
> The "-a" flag with perf record (and most friends except top) on RHEL
> 6.1 and 6.3 seems to cause a kernel panic on Intel Xeon- 12 and 24
> core systems (only ones I tried so far).
>
> After about 1 second workstation completely freezes and then after
> maybe 10 seconds I see a panic.
>
> Since I realize I am probably using an ancient version of perf I am
> more trying to solicit some speculation or gather whether this is
> already a known issue with this particular software/hardware,
> backtrace combination?
>
> In the back trace the RIP points to __get_user_pages_fast, but I am
> unsure how to go further.
>
> Neither the perf-user archives or the git commit logs seem too helpful
> to me about this function as a keyword to search for.
> (http://article.gmane.org/gmane.linux.kernel.perf.user/665/match=__get_user_pages_fast
> -returns a thread but on PPC not x86.
>
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=__get_user_pages_fast
> I can't tell if any of the commit messages would fix this. However, I
> don't know what, "this" actually is or what's broken really.
>
> This is a back trace (of the 3 cores the RIP is in
> __get_user_pages_fast, different process every time.
>
> crash > log | grep BUG
>
> "BUG: unable to handle kernel NULL pointer dereference at 0000000000000050"
>
> crash> bt
> PID: 7558 TASK: ffff8801993614c0 CPU: 1 COMMAND: "fprintd"
> #0 [ffff88020bbef720] machine_kexec at ffffffff810310cb
> #1 [ffff88020bbef780] crash_kexec at ffffffff810b6312
> #2 [ffff88020bbef850] oops_end at ffffffff814de190
> #3 [ffff88020bbef880] no_context at ffffffff81040c9b
> #4 [ffff88020bbef8d0] __bad_area_nosemaphore at ffffffff81040f25
> #5 [ffff88020bbef920] bad_area_nosemaphore at ffffffff81040ff3
> #6 [ffff88020bbef930] __do_page_fault at ffffffff810416cd
> #7 [ffff88020bbefa50] do_page_fault at ffffffff814e017e
> #8 [ffff88020bbefa80] page_fault at ffffffff814dd525
> [exception RIP: __get_user_pages_fast+156]
> RIP: ffffffff810464dc RSP: ffff88020bbefb38 RFLAGS: 00010046
> RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff88020bbeffd8
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffff88020bbefb98 R8: ffff880028220000 R9: ffff88020bbefcf8
> R10: ffff88020bbefde8 R11: 0000000000000001 R12: 0000000000000000
> R13: 0000000000001000 R14: 0000008000000000 R15: 0000000000000fff
> ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
> #9 [ffff88020bbefba0] copy_from_user_nmi at ffffffff8101ae31
> #10 [ffff88020bbefc00] perf_callchain_user at ffffffff8101b008
> #11 [ffff88020bbefc50] perf_prepare_sample at ffffffff81106420
> #12 [ffff88020bbefca0] __perf_event_overflow at ffffffff81108b38
> #13 [ffff88020bbefd40] perf_swevent_overflow at ffffffff81108cd4
> #14 [ffff88020bbefd80] do_perf_sw_event at ffffffff81108ee0
> #15 [ffff88020bbefde0] perf_tp_event at ffffffff81108f94
> #16 [ffff88020bbefe60] ftrace_profile_templ_sched_process_template at
> ffffffff8104d66a
> #17 [ffff88020bbefeb0] ftrace_profile_sched_process_exit at ffffffff8104d6d3
> #18 [ffff88020bbefec0] do_exit at ffffffff8106c34d
> #19 [ffff88020bbeff40] do_group_exit at ffffffff8106c4b8
> #20 [ffff88020bbeff70] sys_exit_group at ffffffff8106c547
> #21 [ffff88020bbeff80] system_call_fastpath at ffffffff8100b172
> RIP: 000000324eeabd98 RSP: 00007fff4b3a55c8 RFLAGS: 00010246
> RAX: 00000000000000e7 RBX: ffffffff8100b172 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
> RBP: 0000000000000000 R8: 00000000000000e7 R9: ffffffffffffffa8
> R10: 000000324f18e7e8 R11: 0000000000000246 R12: ffffffff8106c547
> R13: ffff88020bbeff78 R14: 00000032504e4970 R15: 00000000020a1750
> ORIG_RAX: 00000000000000e7 CS: 0033 SS: 002b
>
>
>
> "0xffffffff810464dc <__get_user_pages_fast+156>: add
> 0x50(%rdx),%r12" << what is this doing?
>
>> disassemble __get_user_pages_fast:
>
> 0xffffffff81046440 <__get_user_pages_fast+0>: push %rbp
> 0xffffffff81046441 <__get_user_pages_fast+1>: mov %rsp,%rbp
> 0xffffffff81046444 <__get_user_pages_fast+4>: push %r15
> 0xffffffff81046446 <__get_user_pages_fast+6>: push %r14
> 0xffffffff81046448 <__get_user_pages_fast+8>: push %r13
> 0xffffffff8104644a <__get_user_pages_fast+10>: push %r12
> 0xffffffff8104644c <__get_user_pages_fast+12>: push %rbx
> 0xffffffff8104644d <__get_user_pages_fast+13>: sub $0x38,%rsp
> 0xffffffff81046451 <__get_user_pages_fast+17>: nopl 0x0(%rax,%rax,1)
> 0xffffffff81046456 <__get_user_pages_fast+22>: mov %gs:0xcc00,%rax
> 0xffffffff8104645f <__get_user_pages_fast+31>: and $0xfffffffffffff000,%rdi
> 0xffffffff81046466 <__get_user_pages_fast+38>: movslq %esi,%r13
> 0xffffffff81046469 <__get_user_pages_fast+41>: mov %rcx,-0x50(%rbp)
> 0xffffffff8104646d <__get_user_pages_fast+45>: mov %edx,-0x44(%rbp)
> 0xffffffff81046470 <__get_user_pages_fast+48>: shl $0xc,%r13
> 0xffffffff81046474 <__get_user_pages_fast+52>: mov 0x480(%rax),%rdx
> 0xffffffff8104647b <__get_user_pages_fast+59>: mov %gs:0xcc08,%rcx
> 0xffffffff81046484 <__get_user_pages_fast+68>: movl $0x0,-0x34(%rbp)
> 0xffffffff8104648b <__get_user_pages_fast+75>: mov %rdi,%rax
> 0xffffffff8104648e <__get_user_pages_fast+78>: add %r13,%rax
> 0xffffffff81046491 <__get_user_pages_fast+81>: sbb %rbx,%rbx
> 0xffffffff81046494 <__get_user_pages_fast+84>: cmp %rax,-0x1fb8(%rcx)
> 0xffffffff8104649b <__get_user_pages_fast+91>: sbb $0x0,%rbx
> 0xffffffff8104649f <__get_user_pages_fast+95>: test %rbx,%rbx
> 0xffffffff810464a2 <__get_user_pages_fast+98>: jne
> 0xffffffff8104654d <__get_user_pages_fast+269>
> 0xffffffff810464a8 <__get_user_pages_fast+104>: add %rdi,%r13
> 0xffffffff810464ab <__get_user_pages_fast+107>: pushfq
> 0xffffffff810464ac <__get_user_pages_fast+108>: pop %rax
> 0xffffffff810464ad <__get_user_pages_fast+109>: nopl 0x0(%rax,%rax,1)
> 0xffffffff810464b2 <__get_user_pages_fast+114>: mov %rax,-0x58(%rbp)
> 0xffffffff810464b6 <__get_user_pages_fast+118>: cli
> 0xffffffff810464b7 <__get_user_pages_fast+119>: nopw 0x0(%rax,%rax,1)
> 0xffffffff810464bd <__get_user_pages_fast+125>: mov %rdi,%r12
> 0xffffffff810464c0 <__get_user_pages_fast+128>: lea -0x1(%r13),%r15
> 0xffffffff810464c4 <__get_user_pages_fast+132>: mov %rdi,%rsi
> 0xffffffff810464c7 <__get_user_pages_fast+135>: shr $0x24,%r12
> 0xffffffff810464cb <__get_user_pages_fast+139>: mov $0x8000000000,%r14
> 0xffffffff810464d5 <__get_user_pages_fast+149>: and $0xff8,%r12d
> 0xffffffff810464dc <__get_user_pages_fast+156>: add 0x50(%rdx),%r12
> 0xffffffff810464e0 <__get_user_pages_fast+160>: jmp
> 0xffffffff810464ef <__get_user_pages_fast+175>
> 0xffffffff810464e2 <__get_user_pages_fast+162>: nopw 0x0(%rax,%rax,1)
> 0xffffffff810464e8 <__get_user_pages_fast+168>: add $0x8,%r12
> 0xffffffff810464ec <__get_user_pages_fast+172>: mov %rbx,%rsi
> 0xffffffff810464ef <__get_user_pages_fast+175>: lea (%rsi,%r14,1),%rbx
> 0xffffffff810464f3 <__get_user_pages_fast+179>: mov $0xffffff8000000000,%rax
> 0xffffffff810464fd <__get_user_pages_fast+189>: mov (%r12),%rdi
> 0xffffffff81046501 <__get_user_pages_fast+193>: and %rax,%rbx
> 0xffffffff81046504 <__get_user_pages_fast+196>: lea -0x1(%rbx),%rax
> 0xffffffff81046508 <__get_user_pages_fast+200>: cmp %r15,%rax
> 0xffffffff8104650b <__get_user_pages_fast+203>: cmovae %r13,%rbx
> 0xffffffff8104650f <__get_user_pages_fast+207>: test %rdi,%rdi
> 0xffffffff81046512 <__get_user_pages_fast+210>: je
> 0xffffffff81046530 <__get_user_pages_fast+240>
> 0xffffffff81046514 <__get_user_pages_fast+212>: mov -0x50(%rbp),%r8
> 0xffffffff81046518 <__get_user_pages_fast+216>: mov -0x44(%rbp),%ecx
> 0xffffffff8104651b <__get_user_pages_fast+219>: lea -0x34(%rbp),%r9
> 0xffffffff8104651f <__get_user_pages_fast+223>: mov %rbx,%rdx
> 0xffffffff81046522 <__get_user_pages_fast+226>: callq
> 0xffffffff810460b0 <gup_pud_range>
> 0xffffffff81046527 <__get_user_pages_fast+231>: test %eax,%eax
> 0xffffffff81046529 <__get_user_pages_fast+233>: je
> 0xffffffff81046530 <__get_user_pages_fast+240>
> 0xffffffff8104652b <__get_user_pages_fast+235>: cmp %r13,%rbx
> 0xffffffff8104652e <__get_user_pages_fast+238>: jne
> 0xffffffff810464e8 <__get_user_pages_fast+168>
> 0xffffffff81046530 <__get_user_pages_fast+240>: mov -0x58(%rbp),%rdi
> 0xffffffff81046534 <__get_user_pages_fast+244>: push %rdi
> 0xffffffff81046535 <__get_user_pages_fast+245>: popfq
> 0xffffffff81046536 <__get_user_pages_fast+246>: nopl 0x0(%rax,%rax,1)
> 0xffffffff8104653b <__get_user_pages_fast+251>: mov -0x34(%rbp),%eax
> 0xffffffff8104653e <__get_user_pages_fast+254>: add $0x38,%rsp
> 0xffffffff81046542 <__get_user_pages_fast+258>: pop %rbx
> 0xffffffff81046543 <__get_user_pages_fast+259>: pop %r12
> 0xffffffff81046545 <__get_user_pages_fast+261>: pop %r13
> 0xffffffff81046547 <__get_user_pages_fast+263>: pop %r14
> 0xffffffff81046549 <__get_user_pages_fast+265>: pop %r15
> 0xffffffff8104654b <__get_user_pages_fast+267>: leaveq
> 0xffffffff8104654c <__get_user_pages_fast+268>: retq
> 0xffffffff8104654d <__get_user_pages_fast+269>: xor %eax,%eax
> 0xffffffff8104654f <__get_user_pages_fast+271>: jmp
> 0xffffffff8104653e <__get_user_pages_fast+254>
> End of assembler dump.
> crash>
>
>> whatis __get_user_pages_fast
> int __get_user_pages_fast(long unsigned int, int, int, struct page **);
>
> Thank you,
>
> Dennis O.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: kernel panic w/ __get_user_pages_fast in 2.6.32-358.6.2
2014-01-21 17:55 ` Dennis
@ 2014-01-24 0:28 ` Dennis
2014-01-24 2:39 ` Andreas Hollmann
0 siblings, 1 reply; 4+ messages in thread
From: Dennis @ 2014-01-24 0:28 UTC (permalink / raw)
To: linux-perf-users
Hi gentle people,
Would another mailing list be a more appropriate forum for this
question (such as LKML?)?
Would this be easier if I provided more output from the crash utility?
Here is a partial /proc/cpuinfo output in case there is a possible known issue.
$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 45
model name : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
stepping : 7
cpu MHz : 1200.000
cache size : 15360 KB
physical id : 0
siblings : 12
core id : 0
cpu cores : 6
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good
xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl
vmx smx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 x2apic popcnt
aes xsave avx lahf_lm ida arat epb xsaveopt pln pts tpr_shadow vnmi
flexpriority ept vpid
bogomips : 3991.02
clflush size : 64
cache_alignment : 64
address sizes : 46 bits physical, 48 bits virtual
power management:
Thanks,
Dennis O.
On Tue, Jan 21, 2014 at 9:55 AM, Dennis <daodennis@gmail.com> wrote:
>
> Any takers on what might have caused this KP?
>
> Regards,
>
> Dennis O.
>
> On Tue, Jan 14, 2014 at 7:54 PM, Dennis <daodennis@gmail.com> wrote:
> > Hi,
> >
> > (x86_64 / Xeon / perf-2.6.32-358.6.2)
> >
> > The "-a" flag with perf record (and most friends except top) on RHEL
> > 6.1 and 6.3 seems to cause a kernel panic on Intel Xeon- 12 and 24
> > core systems (only ones I tried so far).
> >
> > After about 1 second workstation completely freezes and then after
> > maybe 10 seconds I see a panic.
> >
> > Since I realize I am probably using an ancient version of perf I am
> > more trying to solicit some speculation or gather whether this is
> > already a known issue with this particular software/hardware,
> > backtrace combination?
> >
> > In the back trace the RIP points to __get_user_pages_fast, but I am
> > unsure how to go further.
> >
> > Neither the perf-user archives or the git commit logs seem too helpful
> > to me about this function as a keyword to search for.
> > (http://article.gmane.org/gmane.linux.kernel.perf.user/665/match=__get_user_pages_fast
> > -returns a thread but on PPC not x86.
> >
> > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=__get_user_pages_fast
> > I can't tell if any of the commit messages would fix this. However, I
> > don't know what, "this" actually is or what's broken really.
> >
> > This is a back trace (of the 3 cores the RIP is in
> > __get_user_pages_fast, different process every time.
> >
> > crash > log | grep BUG
> >
> > "BUG: unable to handle kernel NULL pointer dereference at 0000000000000050"
> >
> > crash> bt
> > PID: 7558 TASK: ffff8801993614c0 CPU: 1 COMMAND: "fprintd"
> > #0 [ffff88020bbef720] machine_kexec at ffffffff810310cb
> > #1 [ffff88020bbef780] crash_kexec at ffffffff810b6312
> > #2 [ffff88020bbef850] oops_end at ffffffff814de190
> > #3 [ffff88020bbef880] no_context at ffffffff81040c9b
> > #4 [ffff88020bbef8d0] __bad_area_nosemaphore at ffffffff81040f25
> > #5 [ffff88020bbef920] bad_area_nosemaphore at ffffffff81040ff3
> > #6 [ffff88020bbef930] __do_page_fault at ffffffff810416cd
> > #7 [ffff88020bbefa50] do_page_fault at ffffffff814e017e
> > #8 [ffff88020bbefa80] page_fault at ffffffff814dd525
> > [exception RIP: __get_user_pages_fast+156]
> > RIP: ffffffff810464dc RSP: ffff88020bbefb38 RFLAGS: 00010046
> > RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff88020bbeffd8
> > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> > RBP: ffff88020bbefb98 R8: ffff880028220000 R9: ffff88020bbefcf8
> > R10: ffff88020bbefde8 R11: 0000000000000001 R12: 0000000000000000
> > R13: 0000000000001000 R14: 0000008000000000 R15: 0000000000000fff
> > ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
> > #9 [ffff88020bbefba0] copy_from_user_nmi at ffffffff8101ae31
> > #10 [ffff88020bbefc00] perf_callchain_user at ffffffff8101b008
> > #11 [ffff88020bbefc50] perf_prepare_sample at ffffffff81106420
> > #12 [ffff88020bbefca0] __perf_event_overflow at ffffffff81108b38
> > #13 [ffff88020bbefd40] perf_swevent_overflow at ffffffff81108cd4
> > #14 [ffff88020bbefd80] do_perf_sw_event at ffffffff81108ee0
> > #15 [ffff88020bbefde0] perf_tp_event at ffffffff81108f94
> > #16 [ffff88020bbefe60] ftrace_profile_templ_sched_process_template at
> > ffffffff8104d66a
> > #17 [ffff88020bbefeb0] ftrace_profile_sched_process_exit at ffffffff8104d6d3
> > #18 [ffff88020bbefec0] do_exit at ffffffff8106c34d
> > #19 [ffff88020bbeff40] do_group_exit at ffffffff8106c4b8
> > #20 [ffff88020bbeff70] sys_exit_group at ffffffff8106c547
> > #21 [ffff88020bbeff80] system_call_fastpath at ffffffff8100b172
> > RIP: 000000324eeabd98 RSP: 00007fff4b3a55c8 RFLAGS: 00010246
> > RAX: 00000000000000e7 RBX: ffffffff8100b172 RCX: 0000000000000000
> > RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
> > RBP: 0000000000000000 R8: 00000000000000e7 R9: ffffffffffffffa8
> > R10: 000000324f18e7e8 R11: 0000000000000246 R12: ffffffff8106c547
> > R13: ffff88020bbeff78 R14: 00000032504e4970 R15: 00000000020a1750
> > ORIG_RAX: 00000000000000e7 CS: 0033 SS: 002b
> >
> >
> >
> > "0xffffffff810464dc <__get_user_pages_fast+156>: add
> > 0x50(%rdx),%r12" << what is this doing?
> >
> >> disassemble __get_user_pages_fast:
> >
> > 0xffffffff81046440 <__get_user_pages_fast+0>: push %rbp
> > 0xffffffff81046441 <__get_user_pages_fast+1>: mov %rsp,%rbp
> > 0xffffffff81046444 <__get_user_pages_fast+4>: push %r15
> > 0xffffffff81046446 <__get_user_pages_fast+6>: push %r14
> > 0xffffffff81046448 <__get_user_pages_fast+8>: push %r13
> > 0xffffffff8104644a <__get_user_pages_fast+10>: push %r12
> > 0xffffffff8104644c <__get_user_pages_fast+12>: push %rbx
> > 0xffffffff8104644d <__get_user_pages_fast+13>: sub $0x38,%rsp
> > 0xffffffff81046451 <__get_user_pages_fast+17>: nopl 0x0(%rax,%rax,1)
> > 0xffffffff81046456 <__get_user_pages_fast+22>: mov %gs:0xcc00,%rax
> > 0xffffffff8104645f <__get_user_pages_fast+31>: and $0xfffffffffffff000,%rdi
> > 0xffffffff81046466 <__get_user_pages_fast+38>: movslq %esi,%r13
> > 0xffffffff81046469 <__get_user_pages_fast+41>: mov %rcx,-0x50(%rbp)
> > 0xffffffff8104646d <__get_user_pages_fast+45>: mov %edx,-0x44(%rbp)
> > 0xffffffff81046470 <__get_user_pages_fast+48>: shl $0xc,%r13
> > 0xffffffff81046474 <__get_user_pages_fast+52>: mov 0x480(%rax),%rdx
> > 0xffffffff8104647b <__get_user_pages_fast+59>: mov %gs:0xcc08,%rcx
> > 0xffffffff81046484 <__get_user_pages_fast+68>: movl $0x0,-0x34(%rbp)
> > 0xffffffff8104648b <__get_user_pages_fast+75>: mov %rdi,%rax
> > 0xffffffff8104648e <__get_user_pages_fast+78>: add %r13,%rax
> > 0xffffffff81046491 <__get_user_pages_fast+81>: sbb %rbx,%rbx
> > 0xffffffff81046494 <__get_user_pages_fast+84>: cmp %rax,-0x1fb8(%rcx)
> > 0xffffffff8104649b <__get_user_pages_fast+91>: sbb $0x0,%rbx
> > 0xffffffff8104649f <__get_user_pages_fast+95>: test %rbx,%rbx
> > 0xffffffff810464a2 <__get_user_pages_fast+98>: jne
> > 0xffffffff8104654d <__get_user_pages_fast+269>
> > 0xffffffff810464a8 <__get_user_pages_fast+104>: add %rdi,%r13
> > 0xffffffff810464ab <__get_user_pages_fast+107>: pushfq
> > 0xffffffff810464ac <__get_user_pages_fast+108>: pop %rax
> > 0xffffffff810464ad <__get_user_pages_fast+109>: nopl 0x0(%rax,%rax,1)
> > 0xffffffff810464b2 <__get_user_pages_fast+114>: mov %rax,-0x58(%rbp)
> > 0xffffffff810464b6 <__get_user_pages_fast+118>: cli
> > 0xffffffff810464b7 <__get_user_pages_fast+119>: nopw 0x0(%rax,%rax,1)
> > 0xffffffff810464bd <__get_user_pages_fast+125>: mov %rdi,%r12
> > 0xffffffff810464c0 <__get_user_pages_fast+128>: lea -0x1(%r13),%r15
> > 0xffffffff810464c4 <__get_user_pages_fast+132>: mov %rdi,%rsi
> > 0xffffffff810464c7 <__get_user_pages_fast+135>: shr $0x24,%r12
> > 0xffffffff810464cb <__get_user_pages_fast+139>: mov $0x8000000000,%r14
> > 0xffffffff810464d5 <__get_user_pages_fast+149>: and $0xff8,%r12d
> > 0xffffffff810464dc <__get_user_pages_fast+156>: add 0x50(%rdx),%r12
> > 0xffffffff810464e0 <__get_user_pages_fast+160>: jmp
> > 0xffffffff810464ef <__get_user_pages_fast+175>
> > 0xffffffff810464e2 <__get_user_pages_fast+162>: nopw 0x0(%rax,%rax,1)
> > 0xffffffff810464e8 <__get_user_pages_fast+168>: add $0x8,%r12
> > 0xffffffff810464ec <__get_user_pages_fast+172>: mov %rbx,%rsi
> > 0xffffffff810464ef <__get_user_pages_fast+175>: lea (%rsi,%r14,1),%rbx
> > 0xffffffff810464f3 <__get_user_pages_fast+179>: mov $0xffffff8000000000,%rax
> > 0xffffffff810464fd <__get_user_pages_fast+189>: mov (%r12),%rdi
> > 0xffffffff81046501 <__get_user_pages_fast+193>: and %rax,%rbx
> > 0xffffffff81046504 <__get_user_pages_fast+196>: lea -0x1(%rbx),%rax
> > 0xffffffff81046508 <__get_user_pages_fast+200>: cmp %r15,%rax
> > 0xffffffff8104650b <__get_user_pages_fast+203>: cmovae %r13,%rbx
> > 0xffffffff8104650f <__get_user_pages_fast+207>: test %rdi,%rdi
> > 0xffffffff81046512 <__get_user_pages_fast+210>: je
> > 0xffffffff81046530 <__get_user_pages_fast+240>
> > 0xffffffff81046514 <__get_user_pages_fast+212>: mov -0x50(%rbp),%r8
> > 0xffffffff81046518 <__get_user_pages_fast+216>: mov -0x44(%rbp),%ecx
> > 0xffffffff8104651b <__get_user_pages_fast+219>: lea -0x34(%rbp),%r9
> > 0xffffffff8104651f <__get_user_pages_fast+223>: mov %rbx,%rdx
> > 0xffffffff81046522 <__get_user_pages_fast+226>: callq
> > 0xffffffff810460b0 <gup_pud_range>
> > 0xffffffff81046527 <__get_user_pages_fast+231>: test %eax,%eax
> > 0xffffffff81046529 <__get_user_pages_fast+233>: je
> > 0xffffffff81046530 <__get_user_pages_fast+240>
> > 0xffffffff8104652b <__get_user_pages_fast+235>: cmp %r13,%rbx
> > 0xffffffff8104652e <__get_user_pages_fast+238>: jne
> > 0xffffffff810464e8 <__get_user_pages_fast+168>
> > 0xffffffff81046530 <__get_user_pages_fast+240>: mov -0x58(%rbp),%rdi
> > 0xffffffff81046534 <__get_user_pages_fast+244>: push %rdi
> > 0xffffffff81046535 <__get_user_pages_fast+245>: popfq
> > 0xffffffff81046536 <__get_user_pages_fast+246>: nopl 0x0(%rax,%rax,1)
> > 0xffffffff8104653b <__get_user_pages_fast+251>: mov -0x34(%rbp),%eax
> > 0xffffffff8104653e <__get_user_pages_fast+254>: add $0x38,%rsp
> > 0xffffffff81046542 <__get_user_pages_fast+258>: pop %rbx
> > 0xffffffff81046543 <__get_user_pages_fast+259>: pop %r12
> > 0xffffffff81046545 <__get_user_pages_fast+261>: pop %r13
> > 0xffffffff81046547 <__get_user_pages_fast+263>: pop %r14
> > 0xffffffff81046549 <__get_user_pages_fast+265>: pop %r15
> > 0xffffffff8104654b <__get_user_pages_fast+267>: leaveq
> > 0xffffffff8104654c <__get_user_pages_fast+268>: retq
> > 0xffffffff8104654d <__get_user_pages_fast+269>: xor %eax,%eax
> > 0xffffffff8104654f <__get_user_pages_fast+271>: jmp
> > 0xffffffff8104653e <__get_user_pages_fast+254>
> > End of assembler dump.
> > crash>
> >
> >> whatis __get_user_pages_fast
> > int __get_user_pages_fast(long unsigned int, int, int, struct page **);
> >
> > Thank you,
> >
> > Dennis O.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: kernel panic w/ __get_user_pages_fast in 2.6.32-358.6.2
2014-01-24 0:28 ` Dennis
@ 2014-01-24 2:39 ` Andreas Hollmann
0 siblings, 0 replies; 4+ messages in thread
From: Andreas Hollmann @ 2014-01-24 2:39 UTC (permalink / raw)
To: Dennis; +Cc: linux-perf-users
Can you reproduce this bug? Is this the latest available kernel for
your machine?
There are some bugs related to perf, but you have to search yourself or upgrade
to a more recent kernel version.
Try this perf tests. They could help.
https://github.com/deater/perf_event_tests
Best regards,
Andreas
2014/1/24 Dennis <daodennis@gmail.com>:
> Hi gentle people,
>
> Would another mailing list be a more appropriate forum for this
> question (such as LKML?)?
> Would this be easier if I provided more output from the crash utility?
>
> Here is a partial /proc/cpuinfo output in case there is a possible known issue.
>
> $ cat /proc/cpuinfo
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 45
> model name : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
> stepping : 7
> cpu MHz : 1200.000
> cache size : 15360 KB
> physical id : 0
> siblings : 12
> core id : 0
> cpu cores : 6
> apicid : 0
> initial apicid : 0
> fpu : yes
> fpu_exception : yes
> cpuid level : 13
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
> pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
> pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good
> xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl
> vmx smx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 x2apic popcnt
> aes xsave avx lahf_lm ida arat epb xsaveopt pln pts tpr_shadow vnmi
> flexpriority ept vpid
> bogomips : 3991.02
> clflush size : 64
> cache_alignment : 64
> address sizes : 46 bits physical, 48 bits virtual
> power management:
>
>
> Thanks,
>
> Dennis O.
>
>
> On Tue, Jan 21, 2014 at 9:55 AM, Dennis <daodennis@gmail.com> wrote:
>>
>> Any takers on what might have caused this KP?
>>
>> Regards,
>>
>> Dennis O.
>>
>> On Tue, Jan 14, 2014 at 7:54 PM, Dennis <daodennis@gmail.com> wrote:
>> > Hi,
>> >
>> > (x86_64 / Xeon / perf-2.6.32-358.6.2)
>> >
>> > The "-a" flag with perf record (and most friends except top) on RHEL
>> > 6.1 and 6.3 seems to cause a kernel panic on Intel Xeon- 12 and 24
>> > core systems (only ones I tried so far).
>> >
>> > After about 1 second workstation completely freezes and then after
>> > maybe 10 seconds I see a panic.
>> >
>> > Since I realize I am probably using an ancient version of perf I am
>> > more trying to solicit some speculation or gather whether this is
>> > already a known issue with this particular software/hardware,
>> > backtrace combination?
>> >
>> > In the back trace the RIP points to __get_user_pages_fast, but I am
>> > unsure how to go further.
>> >
>> > Neither the perf-user archives or the git commit logs seem too helpful
>> > to me about this function as a keyword to search for.
>> > (http://article.gmane.org/gmane.linux.kernel.perf.user/665/match=__get_user_pages_fast
>> > -returns a thread but on PPC not x86.
>> >
>> > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=__get_user_pages_fast
>> > I can't tell if any of the commit messages would fix this. However, I
>> > don't know what, "this" actually is or what's broken really.
>> >
>> > This is a back trace (of the 3 cores the RIP is in
>> > __get_user_pages_fast, different process every time.
>> >
>> > crash > log | grep BUG
>> >
>> > "BUG: unable to handle kernel NULL pointer dereference at 0000000000000050"
>> >
>> > crash> bt
>> > PID: 7558 TASK: ffff8801993614c0 CPU: 1 COMMAND: "fprintd"
>> > #0 [ffff88020bbef720] machine_kexec at ffffffff810310cb
>> > #1 [ffff88020bbef780] crash_kexec at ffffffff810b6312
>> > #2 [ffff88020bbef850] oops_end at ffffffff814de190
>> > #3 [ffff88020bbef880] no_context at ffffffff81040c9b
>> > #4 [ffff88020bbef8d0] __bad_area_nosemaphore at ffffffff81040f25
>> > #5 [ffff88020bbef920] bad_area_nosemaphore at ffffffff81040ff3
>> > #6 [ffff88020bbef930] __do_page_fault at ffffffff810416cd
>> > #7 [ffff88020bbefa50] do_page_fault at ffffffff814e017e
>> > #8 [ffff88020bbefa80] page_fault at ffffffff814dd525
>> > [exception RIP: __get_user_pages_fast+156]
>> > RIP: ffffffff810464dc RSP: ffff88020bbefb38 RFLAGS: 00010046
>> > RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffff88020bbeffd8
>> > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
>> > RBP: ffff88020bbefb98 R8: ffff880028220000 R9: ffff88020bbefcf8
>> > R10: ffff88020bbefde8 R11: 0000000000000001 R12: 0000000000000000
>> > R13: 0000000000001000 R14: 0000008000000000 R15: 0000000000000fff
>> > ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
>> > #9 [ffff88020bbefba0] copy_from_user_nmi at ffffffff8101ae31
>> > #10 [ffff88020bbefc00] perf_callchain_user at ffffffff8101b008
>> > #11 [ffff88020bbefc50] perf_prepare_sample at ffffffff81106420
>> > #12 [ffff88020bbefca0] __perf_event_overflow at ffffffff81108b38
>> > #13 [ffff88020bbefd40] perf_swevent_overflow at ffffffff81108cd4
>> > #14 [ffff88020bbefd80] do_perf_sw_event at ffffffff81108ee0
>> > #15 [ffff88020bbefde0] perf_tp_event at ffffffff81108f94
>> > #16 [ffff88020bbefe60] ftrace_profile_templ_sched_process_template at
>> > ffffffff8104d66a
>> > #17 [ffff88020bbefeb0] ftrace_profile_sched_process_exit at ffffffff8104d6d3
>> > #18 [ffff88020bbefec0] do_exit at ffffffff8106c34d
>> > #19 [ffff88020bbeff40] do_group_exit at ffffffff8106c4b8
>> > #20 [ffff88020bbeff70] sys_exit_group at ffffffff8106c547
>> > #21 [ffff88020bbeff80] system_call_fastpath at ffffffff8100b172
>> > RIP: 000000324eeabd98 RSP: 00007fff4b3a55c8 RFLAGS: 00010246
>> > RAX: 00000000000000e7 RBX: ffffffff8100b172 RCX: 0000000000000000
>> > RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
>> > RBP: 0000000000000000 R8: 00000000000000e7 R9: ffffffffffffffa8
>> > R10: 000000324f18e7e8 R11: 0000000000000246 R12: ffffffff8106c547
>> > R13: ffff88020bbeff78 R14: 00000032504e4970 R15: 00000000020a1750
>> > ORIG_RAX: 00000000000000e7 CS: 0033 SS: 002b
>> >
>> >
>> >
>> > "0xffffffff810464dc <__get_user_pages_fast+156>: add
>> > 0x50(%rdx),%r12" << what is this doing?
>> >
>> >> disassemble __get_user_pages_fast:
>> >
>> > 0xffffffff81046440 <__get_user_pages_fast+0>: push %rbp
>> > 0xffffffff81046441 <__get_user_pages_fast+1>: mov %rsp,%rbp
>> > 0xffffffff81046444 <__get_user_pages_fast+4>: push %r15
>> > 0xffffffff81046446 <__get_user_pages_fast+6>: push %r14
>> > 0xffffffff81046448 <__get_user_pages_fast+8>: push %r13
>> > 0xffffffff8104644a <__get_user_pages_fast+10>: push %r12
>> > 0xffffffff8104644c <__get_user_pages_fast+12>: push %rbx
>> > 0xffffffff8104644d <__get_user_pages_fast+13>: sub $0x38,%rsp
>> > 0xffffffff81046451 <__get_user_pages_fast+17>: nopl 0x0(%rax,%rax,1)
>> > 0xffffffff81046456 <__get_user_pages_fast+22>: mov %gs:0xcc00,%rax
>> > 0xffffffff8104645f <__get_user_pages_fast+31>: and $0xfffffffffffff000,%rdi
>> > 0xffffffff81046466 <__get_user_pages_fast+38>: movslq %esi,%r13
>> > 0xffffffff81046469 <__get_user_pages_fast+41>: mov %rcx,-0x50(%rbp)
>> > 0xffffffff8104646d <__get_user_pages_fast+45>: mov %edx,-0x44(%rbp)
>> > 0xffffffff81046470 <__get_user_pages_fast+48>: shl $0xc,%r13
>> > 0xffffffff81046474 <__get_user_pages_fast+52>: mov 0x480(%rax),%rdx
>> > 0xffffffff8104647b <__get_user_pages_fast+59>: mov %gs:0xcc08,%rcx
>> > 0xffffffff81046484 <__get_user_pages_fast+68>: movl $0x0,-0x34(%rbp)
>> > 0xffffffff8104648b <__get_user_pages_fast+75>: mov %rdi,%rax
>> > 0xffffffff8104648e <__get_user_pages_fast+78>: add %r13,%rax
>> > 0xffffffff81046491 <__get_user_pages_fast+81>: sbb %rbx,%rbx
>> > 0xffffffff81046494 <__get_user_pages_fast+84>: cmp %rax,-0x1fb8(%rcx)
>> > 0xffffffff8104649b <__get_user_pages_fast+91>: sbb $0x0,%rbx
>> > 0xffffffff8104649f <__get_user_pages_fast+95>: test %rbx,%rbx
>> > 0xffffffff810464a2 <__get_user_pages_fast+98>: jne
>> > 0xffffffff8104654d <__get_user_pages_fast+269>
>> > 0xffffffff810464a8 <__get_user_pages_fast+104>: add %rdi,%r13
>> > 0xffffffff810464ab <__get_user_pages_fast+107>: pushfq
>> > 0xffffffff810464ac <__get_user_pages_fast+108>: pop %rax
>> > 0xffffffff810464ad <__get_user_pages_fast+109>: nopl 0x0(%rax,%rax,1)
>> > 0xffffffff810464b2 <__get_user_pages_fast+114>: mov %rax,-0x58(%rbp)
>> > 0xffffffff810464b6 <__get_user_pages_fast+118>: cli
>> > 0xffffffff810464b7 <__get_user_pages_fast+119>: nopw 0x0(%rax,%rax,1)
>> > 0xffffffff810464bd <__get_user_pages_fast+125>: mov %rdi,%r12
>> > 0xffffffff810464c0 <__get_user_pages_fast+128>: lea -0x1(%r13),%r15
>> > 0xffffffff810464c4 <__get_user_pages_fast+132>: mov %rdi,%rsi
>> > 0xffffffff810464c7 <__get_user_pages_fast+135>: shr $0x24,%r12
>> > 0xffffffff810464cb <__get_user_pages_fast+139>: mov $0x8000000000,%r14
>> > 0xffffffff810464d5 <__get_user_pages_fast+149>: and $0xff8,%r12d
>> > 0xffffffff810464dc <__get_user_pages_fast+156>: add 0x50(%rdx),%r12
>> > 0xffffffff810464e0 <__get_user_pages_fast+160>: jmp
>> > 0xffffffff810464ef <__get_user_pages_fast+175>
>> > 0xffffffff810464e2 <__get_user_pages_fast+162>: nopw 0x0(%rax,%rax,1)
>> > 0xffffffff810464e8 <__get_user_pages_fast+168>: add $0x8,%r12
>> > 0xffffffff810464ec <__get_user_pages_fast+172>: mov %rbx,%rsi
>> > 0xffffffff810464ef <__get_user_pages_fast+175>: lea (%rsi,%r14,1),%rbx
>> > 0xffffffff810464f3 <__get_user_pages_fast+179>: mov $0xffffff8000000000,%rax
>> > 0xffffffff810464fd <__get_user_pages_fast+189>: mov (%r12),%rdi
>> > 0xffffffff81046501 <__get_user_pages_fast+193>: and %rax,%rbx
>> > 0xffffffff81046504 <__get_user_pages_fast+196>: lea -0x1(%rbx),%rax
>> > 0xffffffff81046508 <__get_user_pages_fast+200>: cmp %r15,%rax
>> > 0xffffffff8104650b <__get_user_pages_fast+203>: cmovae %r13,%rbx
>> > 0xffffffff8104650f <__get_user_pages_fast+207>: test %rdi,%rdi
>> > 0xffffffff81046512 <__get_user_pages_fast+210>: je
>> > 0xffffffff81046530 <__get_user_pages_fast+240>
>> > 0xffffffff81046514 <__get_user_pages_fast+212>: mov -0x50(%rbp),%r8
>> > 0xffffffff81046518 <__get_user_pages_fast+216>: mov -0x44(%rbp),%ecx
>> > 0xffffffff8104651b <__get_user_pages_fast+219>: lea -0x34(%rbp),%r9
>> > 0xffffffff8104651f <__get_user_pages_fast+223>: mov %rbx,%rdx
>> > 0xffffffff81046522 <__get_user_pages_fast+226>: callq
>> > 0xffffffff810460b0 <gup_pud_range>
>> > 0xffffffff81046527 <__get_user_pages_fast+231>: test %eax,%eax
>> > 0xffffffff81046529 <__get_user_pages_fast+233>: je
>> > 0xffffffff81046530 <__get_user_pages_fast+240>
>> > 0xffffffff8104652b <__get_user_pages_fast+235>: cmp %r13,%rbx
>> > 0xffffffff8104652e <__get_user_pages_fast+238>: jne
>> > 0xffffffff810464e8 <__get_user_pages_fast+168>
>> > 0xffffffff81046530 <__get_user_pages_fast+240>: mov -0x58(%rbp),%rdi
>> > 0xffffffff81046534 <__get_user_pages_fast+244>: push %rdi
>> > 0xffffffff81046535 <__get_user_pages_fast+245>: popfq
>> > 0xffffffff81046536 <__get_user_pages_fast+246>: nopl 0x0(%rax,%rax,1)
>> > 0xffffffff8104653b <__get_user_pages_fast+251>: mov -0x34(%rbp),%eax
>> > 0xffffffff8104653e <__get_user_pages_fast+254>: add $0x38,%rsp
>> > 0xffffffff81046542 <__get_user_pages_fast+258>: pop %rbx
>> > 0xffffffff81046543 <__get_user_pages_fast+259>: pop %r12
>> > 0xffffffff81046545 <__get_user_pages_fast+261>: pop %r13
>> > 0xffffffff81046547 <__get_user_pages_fast+263>: pop %r14
>> > 0xffffffff81046549 <__get_user_pages_fast+265>: pop %r15
>> > 0xffffffff8104654b <__get_user_pages_fast+267>: leaveq
>> > 0xffffffff8104654c <__get_user_pages_fast+268>: retq
>> > 0xffffffff8104654d <__get_user_pages_fast+269>: xor %eax,%eax
>> > 0xffffffff8104654f <__get_user_pages_fast+271>: jmp
>> > 0xffffffff8104653e <__get_user_pages_fast+254>
>> > End of assembler dump.
>> > crash>
>> >
>> >> whatis __get_user_pages_fast
>> > int __get_user_pages_fast(long unsigned int, int, int, struct page **);
>> >
>> > Thank you,
>> >
>> > Dennis O.
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-01-24 2:39 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-01-15 3:54 kernel panic w/ __get_user_pages_fast in 2.6.32-358.6.2 Dennis
2014-01-21 17:55 ` Dennis
2014-01-24 0:28 ` Dennis
2014-01-24 2:39 ` Andreas Hollmann
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