How to use gdb to debug C1 compiler's internal error?
Leslie Zhai
lesliezhai at llvm.org.cn
Thu Mar 22 16:32:13 UTC 2018
Hi HotSpot compiler developers,
I am new to HotSpot C1 compiler, and I am trying to implement a new
greedy register allocation skeleton for academy research, but might
wrongly modified some code, for example,
`Runtime1::generate_handle_exception` in
jdk/src/hotspot/cpu/x86/c1_Runtime1_x86.cpp, then `install_code` failed
to work and thrown such internal error:
...
[Stub Code]
0x00007fffe13752a0: mov $0x0,%rbx ; {no_reloc}
0x00007fffe13752aa: jmpq 0x00007fffe13752aa ; {runtime_call}
[Exception Handler]
0x00007fffe13752af: jmpq 0x00007fffe1004ee0 ; {runtime_call}
[Deopt Handler Code]
0x00007fffe13752b4: callq 0x00007fffe13752b9
0x00007fffe13752b9: subq $0x5,(%rsp)
0x00007fffe13752be: jmpq 0x00007fffe11072e0 ; {runtime_call}
0x00007fffe13752c3: hlt
0x00007fffe13752c4: hlt
0x00007fffe13752c5: hlt
0x00007fffe13752c6: hlt
0x00007fffe13752c7: hlt
Decoding compiled method 0x00007fffe136d310:
Code:
[Entry Point]
# {method} {0x00007fffe015e0e0} 'fillInStackTrace'
'(I)Ljava/lang/Throwable;' in 'java/lang/Throwable'
# this: rsi:rsi = 'java/lang/Throwable'
# parm0: rdx = int
# [sp+0x50] (sp of caller)
0x00007fffe136d4a0: mov 0x8(%rsi),%r10d
0x00007fffe136d4a4: shl $0x3,%r10
0x00007fffe136d4a8: cmp %r10,%rax
0x00007fffe136d4ab: je 0x00007fffe136d4b8
0x00007fffe136d4b1: jmpq 0x00007fffe1105c40 ; {runtime_call}
0x00007fffe136d4b6: nop
0x00007fffe136d4b7: nop
[Verified Entry Point]
0x00007fffe136d4b8: mov %eax,-0x16000(%rsp)
0x00007fffe136d4bf: push %rbp
0x00007fffe136d4c0: mov %rsp,%rbp
0x00007fffe136d4c3: sub $0x40,%rsp
0x00007fffe136d4c7: mov %rsp,%rax
0x00007fffe136d4ca: and $0xfffffffffffffff0,%rax
0x00007fffe136d4ce: cmp %rsp,%rax
0x00007fffe136d4d1: je 0x00007fffe136d54e
0x00007fffe136d4d7: mov %rsp,-0x28(%rsp)
0x00007fffe136d4dc: sub $0x80,%rsp
0x00007fffe136d4e3: mov %rax,0x78(%rsp)
0x00007fffe136d4e8: mov %rcx,0x70(%rsp)
0x00007fffe136d4ed: mov %rdx,0x68(%rsp)
0x00007fffe136d4f2: mov %rbx,0x60(%rsp)
0x00007fffe136d4f7: mov %rbp,0x50(%rsp)
0x00007fffe136d4fc: mov %rsi,0x48(%rsp)
0x00007fffe136d501: mov %rdi,0x40(%rsp)
0x00007fffe136d506: mov %r8,0x38(%rsp)
0x00007fffe136d50b: mov %r9,0x30(%rsp)
0x00007fffe136d510: mov %r10,0x28(%rsp)
0x00007fffe136d515: mov %r11,0x20(%rsp)
0x00007fffe136d51a: mov %r12,0x18(%rsp)
0x00007fffe136d51f: mov %r13,0x10(%rsp)
0x00007fffe136d524: mov %r14,0x8(%rsp)
0x00007fffe136d529: mov %r15,(%rsp)
0x00007fffe136d52d: mov $0x7ffff6dbea09,%rdi ; {external_word}
0x00007fffe136d537: mov $0x7fffe136d4d7,%rsi ; {internal_word}
0x00007fffe136d541: mov %rsp,%rdx
0x00007fffe136d544: and $0xfffffffffffffff0,%rsp
0x00007fffe136d548: callq 0x00007ffff68211ee ; {runtime_call}
0x00007fffe136d54d: hlt
;; move 1 -> 2
;; move 0 -> 1
0x00007fffe136d54e: mov %rsi,(%rsp)
0x00007fffe136d552: cmp $0x0,%rsi
0x00007fffe136d556: lea (%rsp),%rsi
0x00007fffe136d55a: cmove (%rsp),%rsi ; OopMap{[0]=Oop off=191}
0x00007fffe136d55f: mov $0x7fffe136d55f,%r10 ; {section_word}
0x00007fffe136d569: mov %r10,0x208(%r15)
0x00007fffe136d570: mov %rsp,0x200(%r15)
0x00007fffe136d577: cmpb $0x0,0x1602de2c(%rip) #
0x00007ffff739b3aa
; {external_word}
0x00007fffe136d57e: je 0x00007fffe136d5b8
0x00007fffe136d584: push %rsi
0x00007fffe136d585: push %rdx
0x00007fffe136d586: mov $0x7fffe015e0e0,%rsi ; {metadata({method}
{0x00007fffe015e0e0} 'fillInStackTrace' '(I)Ljava/lang/Throwable;' in
'java/lang/Throwable')}
0x00007fffe136d590: mov %r15,%rdi
0x00007fffe136d593: test $0xf,%esp
0x00007fffe136d599: je 0x00007fffe136d5b1
0x00007fffe136d59f: sub $0x8,%rsp
0x00007fffe136d5a3: callq 0x00007ffff69c48ae ; {runtime_call}
0x00007fffe136d5a8: add $0x8,%rsp
0x00007fffe136d5ac: jmpq 0x00007fffe136d5b6
0x00007fffe136d5b1: callq 0x00007ffff69c48ae ; {runtime_call}
0x00007fffe136d5b6: pop %rdx
0x00007fffe136d5b7: pop %rsi
0x00007fffe136d5b8: lea 0x220(%r15),%rdi
0x00007fffe136d5bf: movl $0x4,0x298(%r15)
0x00007fffe136d5ca: callq 0x00007ffff4f55fef ; {runtime_call}
0x00007fffe136d5cf: vzeroupper
0x00007fffe136d5d2: movl $0x5,0x298(%r15)
0x00007fffe136d5dd: mov %r15d,%ecx
0x00007fffe136d5e0: shr $0x4,%ecx
0x00007fffe136d5e3: and $0xffc,%ecx
0x00007fffe136d5e9: mov $0x7ffff7ff3000,%r10 ; {external_word}
0x00007fffe136d5f3: mov %ecx,(%r10,%rcx,1)
0x00007fffe136d5f7: cmpl $0x0,0x1603f89f(%rip) #
0x00007ffff73acea0
; {external_word}
0x00007fffe136d601: jne 0x00007fffe136d615
0x00007fffe136d607: cmpl $0x0,0x30(%r15)
0x00007fffe136d60f: je 0x00007fffe136d636
0x00007fffe136d615: mov %rax,-0x8(%rbp)
0x00007fffe136d619: mov %r15,%rdi
0x00007fffe136d61c: mov %rsp,%r12
0x00007fffe136d61f: sub $0x0,%rsp
0x00007fffe136d623: and $0xfffffffffffffff0,%rsp
0x00007fffe136d627: callq 0x00007ffff6a691da ; {runtime_call}
0x00007fffe136d62c: mov %r12,%rsp
0x00007fffe136d62f: xor %r12,%r12
0x00007fffe136d632: mov -0x8(%rbp),%rax
0x00007fffe136d636: movl $0x8,0x298(%r15)
0x00007fffe136d641: cmpl $0x1,0x2c4(%r15)
0x00007fffe136d64c: je 0x00007fffe136d6e8
0x00007fffe136d652: cmpb $0x0,0x1602dd51(%rip) #
0x00007ffff739b3aa
; {external_word}
0x00007fffe136d659: je 0x00007fffe136d697
0x00007fffe136d65f: mov %rax,-0x8(%rbp)
0x00007fffe136d663: mov $0x7fffe015e0e0,%rsi ; {metadata({method}
{0x00007fffe015e0e0} 'fillInStackTrace' '(I)Ljava/lang/Throwable;' in
'java/lang/Throwable')}
0x00007fffe136d66d: mov %r15,%rdi
0x00007fffe136d670: test $0xf,%esp
0x00007fffe136d676: je 0x00007fffe136d68e
0x00007fffe136d67c: sub $0x8,%rsp
0x00007fffe136d680: callq 0x00007ffff69c4ab8 ; {runtime_call}
0x00007fffe136d685: add $0x8,%rsp
0x00007fffe136d689: jmpq 0x00007fffe136d693
0x00007fffe136d68e: callq 0x00007ffff69c4ab8 ; {runtime_call}
0x00007fffe136d693: mov -0x8(%rbp),%rax
0x00007fffe136d697: mov $0x0,%r10
0x00007fffe136d6a1: mov %r10,0x200(%r15)
0x00007fffe136d6a8: mov $0x0,%r10
0x00007fffe136d6b2: mov %r10,0x208(%r15)
0x00007fffe136d6b9: test %rax,%rax
0x00007fffe136d6bc: je 0x00007fffe136d6c5
0x00007fffe136d6c2: mov (%rax),%rax
0x00007fffe136d6c5: mov 0x38(%r15),%rcx
0x00007fffe136d6c9: movl $0x0,0x108(%rcx)
0x00007fffe136d6d3: leaveq
0x00007fffe136d6d4: cmpq $0x0,0x8(%r15)
0x00007fffe136d6dc: jne 0x00007fffe136d6e3
0x00007fffe136d6e2: retq
0x00007fffe136d6e3: jmpq Stub::forward exception ; {runtime_call}
0x00007fffe136d6e8: mov %rax,-0x8(%rbp)
0x00007fffe136d6ec: mov %rsp,%r12
0x00007fffe136d6ef: sub $0x0,%rsp
0x00007fffe136d6f3: and $0xfffffffffffffff0,%rsp
0x00007fffe136d6f7: callq 0x00007ffff69c8b64 ; {runtime_call}
0x00007fffe136d6fc: mov %r12,%rsp
0x00007fffe136d6ff: xor %r12,%r12
0x00007fffe136d702: mov -0x8(%rbp),%rax
0x00007fffe136d706: jmpq 0x00007fffe136d652
0x00007fffe136d70b: hlt
0x00007fffe136d70c: hlt
0x00007fffe136d70d: hlt
0x00007fffe136d70e: hlt
0x00007fffe136d70f: hlt
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x000000000000dead, pid=2174, tid=0x00007ffff7fc8700
#
# JRE version: OpenJDK Runtime Environment (8.0) (build
1.8.0-internal-debug-xiangzhai_2018_03_19_20_27-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.71-b00-debug compiled mode
linux-amd64 compressed oops)
# Problematic frame:
# C 0x000000000000dead
#
# Core dump written. Default location:
/data/project/openjdk/jdk8u/hotspot/test/compiler/5057225/core or core.2174
#
# An error report file with more information is saved as:
#
/data/project/openjdk/jdk8u/hotspot/test/compiler/5057225/hs_err_pid2174.log
Compiled method (c1) 21870 156 ! 3
java.lang.ClassLoader::loadClass (122 bytes)
total in heap [0x00007fffe12bcc90,0x00007fffe12beee0] = 8784
relocation [0x00007fffe12bcdc0,0x00007fffe12bcfb8] = 504
main code [0x00007fffe12bcfc0,0x00007fffe12be2c0] = 4864
stub code [0x00007fffe12be2c0,0x00007fffe12be460] = 416
metadata [0x00007fffe12be460,0x00007fffe12be4a0] = 64
scopes data [0x00007fffe12be4a0,0x00007fffe12be848] = 936
scopes pcs [0x00007fffe12be848,0x00007fffe12becd8] = 1168
dependencies [0x00007fffe12becd8,0x00007fffe12bece0] = 8
handler table [0x00007fffe12bece0,0x00007fffe12beea8] = 456
nul chk table [0x00007fffe12beea8,0x00007fffe12beee0] = 56
Compiled method (c1) 21871 156 ! 3
java.lang.ClassLoader::loadClass (122 bytes)
total in heap [0x00007fffe12bcc90,0x00007fffe12beee0] = 8784
relocation [0x00007fffe12bcdc0,0x00007fffe12bcfb8] = 504
main code [0x00007fffe12bcfc0,0x00007fffe12be2c0] = 4864
stub code [0x00007fffe12be2c0,0x00007fffe12be460] = 416
metadata [0x00007fffe12be460,0x00007fffe12be4a0] = 64
scopes data [0x00007fffe12be4a0,0x00007fffe12be848] = 936
scopes pcs [0x00007fffe12be848,0x00007fffe12becd8] = 1168
dependencies [0x00007fffe12becd8,0x00007fffe12bece0] = 8
handler table [0x00007fffe12bece0,0x00007fffe12beea8] = 456
nul chk table [0x00007fffe12beea8,0x00007fffe12beee0] = 56
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
Current thread is 140737353910016
Dumping core ...
[Switching to Thread 0x7ffff7fc8700 (LWP 2178)]
__GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51 }
(gdb) bt
#0 __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007ffff740c4da in __GI_abort () at abort.c:89
#2 0x00007ffff6905d0b in os::abort (dump_core=true)
at
/data/project/openjdk/jdk8u/hotspot/src/os/linux/vm/os_linux.cpp:1515
#3 0x00007ffff6ac75fc in VMError::report_and_die (this=0x7ffff7fc6400)
at
/data/project/openjdk/jdk8u/hotspot/src/share/vm/utilities/vmError.cpp:1060
#4 0x00007ffff6ac7d29 in crash_handler (sig=11, info=0x7ffff7fc6630,
ucVoid=0x7ffff7fc6500)
at
/data/project/openjdk/jdk8u/hotspot/src/os/linux/vm/vmError_linux.cpp:106
#5 <signal handler called>
#6 0x00007ffff690071a in os::print_hex_dump (st=0x7ffff7fc6c30,
start=0xde8d <error: Cannot access memory at address 0xde8d>,
end=0xdecd <error: Cannot access memory at address 0xdecd>, unitsize=1)
at /data/project/openjdk/jdk8u/hotspot/src/share/vm/runtime/os.cpp:802
#7 0x00007ffff691328e in os::print_context (st=0x7ffff7fc6c30,
context=0x7ffff7fc6f00)
at
/data/project/openjdk/jdk8u/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp:823
#8 0x00007ffff6ac5adb in VMError::report (this=0x7ffff7fc6d50,
st=0x7ffff7fc6c30)
at
/data/project/openjdk/jdk8u/hotspot/src/share/vm/utilities/vmError.cpp:534
#9 0x00007ffff6ac70cc in VMError::report_and_die (this=0x7ffff7fc6d50)
at
/data/project/openjdk/jdk8u/hotspot/src/share/vm/utilities/vmError.cpp:971
#10 0x00007ffff6912bde in JVM_handle_linux_signal (sig=11,
info=0x7ffff7fc7030, ucVoid=0x7ffff7fc6f00,
abort_if_unrecognized=1)
at
/data/project/openjdk/jdk8u/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp:541
#11 0x00007ffff690be1d in signalHandler (sig=11, info=0x7ffff7fc7030,
uc=0x7ffff7fc6f00)
at
/data/project/openjdk/jdk8u/hotspot/src/os/linux/vm/os_linux.cpp:4435
#12 <signal handler called>
...
So backtrace or set breakpoint might be helpful for debugging compiling
thread, but doesn't work for running thread? I am reading Analyzing and
Debugging the HotSpot VM at the OS Level[1] please give me some advice,
thanks a lot!
[1] http://www.progdoc.de/papers/JavaOne2014/javaone2014_con3138.html
--
Regards,
Leslie Zhai
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