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4年前
Instrumentation.redefineClasses热更代码导致jvm crash
通过Instrumentation.redefineClasses更新字节码导致进程crash,三个class,其他两个成功了,有一个直接导致crash。
具体原因不确定,看了jvm源码,逻辑极简单,所以无法确认问题点
void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
int methods_length, bool *trace_name_printed) {
assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
// search the MemberNameTable for uses of either obsolete or EMCP methods
for (int j = 0; j < methods_length; j++) {
Method* old_method = old_methods[j];
Method* new_method = new_methods[j];
oop mem_name = find_member_name_by_method(old_method);
if (mem_name != NULL) {
java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
if (!(*trace_name_printed)) {
// RC_TRACE_MESG macro has an embedded ResourceMark
RC_TRACE_MESG(("adjust: name=%s",
old_method->method_holder()->external_name()));
*trace_name_printed = true;
}
// RC_TRACE macro has an embedded ResourceMark
RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
new_method->name()->as_C_string(),
new_method->signature()->as_C_string()));
}
}
}
}
官网上找到的类似redefine问题https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8076110
crash日志如下
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007fc6c666b321, pid=4831, tid=0x00007fc6837b0700
#
# JRE version: Java(TM) SE Runtime Environment (8.0_101-b13) (build 1.8.0_101-b13)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.101-b13 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# V [libjvm.so+0x8c5321] MemberNameTable::adjust_method_entries(InstanceKlass*, bool*)+0x91
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
--------------- T H R E A D ---------------
Current thread (0x00007fc6c00ee000): VMThread [stack: 0x00007fc6836b0000,0x00007fc6837b1000] [id=4844]
siginfo: si_signo: 11 (SIGSEGV), si_code: 128 (SI_KERNEL), si_addr: 0x0000000000000000
Registers:
RAX=0x0a09090a0909640a, RBX=0x00000000b34481a0, RCX=0x00000001003b7c28, RDX=0x00007fc6837af828
RSP=0x00007fc6837af5d0, RBP=0x00007fc6837af670, RSI=0x00000001003b7c28, RDI=0x00000001003b7c28
R8 =0x0000000000000003, R9 =0x0000000000000001, R10=0x0000000000000000, R11=0x0000000000000002
R12=0x00007fc68072bfe8, R13=0x0000000000000000, R14=0x0000000000000000, R15=0x00007fc5d405b500
RIP=0x00007fc6c666b321, EFLAGS=0x0000000000010202, CSGSFS=0x0000000000000033, ERR=0x0000000000000000
TRAPNO=0x000000000000000d
Top of Stack: (sp=0x00007fc6837af5d0)
0x00007fc6837af5d0: 00007fc6741b01f0 00007fc6837af828
0x00007fc6837af5e0: 00000001003b7c28 00007fc6c00ee350
0x00007fc6837af5f0: 00007fc683ddb0b8 00007fc6c00ee000
0x00007fc6837af600: 00007fc6c00ee478 0000000000000006
0x00007fc6837af610: 00007fc6837af650 0000000100000028
0x00007fc6837af620: 00007fc6837af810 00007fc6c009d210
0x00007fc6837af630: 0000000000000001 00007fc6c00ee000
0x00007fc6837af640: 00007fc6837af670 0000000000000000
0x00007fc6837af650: 0000000000000000 0000000000000000
0x00007fc6837af660: 0000000000000001 00007fc6c00ee000
0x00007fc6837af670: 00007fc6837af860 00007fc6c6555039
0x00007fc6837af680: 00007fc6c6643780 0000000000000020
0x00007fc6837af690: 00007fc6837af7b0 00007fc6837af828
0x00007fc6837af6a0: 00007fc6837af740 00007fc6837af7e0
0x00007fc6837af6b0: 00007fc6837af780 00007fc6c00ee000
0x00007fc6837af6c0: 0000000100f5bbd8 00007fc59d7be310
0x00007fc6837af6d0: 00000000aa98ee28 00000001003b7c28
0x00007fc6837af6e0: 0000000000007fd8 00007fc6741b0150
0x00007fc6837af6f0: 000000079ea54c28 00007fc6741b0090
0x00007fc6837af700: 00007fc6837af7b0 0000000000000001
0x00007fc6837af710: 00007fc6837af730 00007fc6c665312a
0x00007fc6837af720: 00000001002b0a70 00007fc59b41d070
0x00007fc6837af730: 0000000000000007 00007fc6c668dea4
0x00007fc6837af740: 00007fc6c00ee000 00007fc6c00ee350
0x00007fc6837af750: 00007fc6c00ee390 00007fc6c00ee3a0
0x00007fc6837af760: 00007fc6c00ee478 00000000000000d8
0x00007fc6837af770: 00007fc6837af880 00007fc5d901ffff
0x00007fc6837af780: 0000000000000000 00007fc6b7d61500
0x00007fc6837af790: 0000000000000000 00007fc6b7d61500
0x00007fc6837af7a0: 00007fc6741b0190 0000000000000007
0x00007fc6837af7b0: 00007fc6c6d0b5b0 00007fc6837af740
0x00007fc6837af7c0: 0000000000000000 0000000000000c00
Instructions: (pc=0x00007fc6c666b321)
0x00007fc6c666b301: 49 89 c4 74 ca 8b 40 20 a9 00 00 01 00 74 c0 66
0x00007fc6c666b311: 85 c0 78 bb 49 8b 44 24 08 48 8b bd 70 ff ff ff
0x00007fc6c666b321: 0f b7 70 2e e8 56 85 d7 ff 48 89 df 48 89 c6 48
0x00007fc6c666b331: 89 85 78 ff ff ff e8 f4 09 dd ff 48 8b 05 c5 b0
Register to memory mapping:
RAX=0x0a09090a0909640a is an unknown value
RBX=0x00000000b34481a0 is an oop
java.lang.invoke.MemberName
- klass: 'java/lang/invoke/MemberName'
RCX=0x00000001003b7c28 is pointing into metadata
RDX=0x00007fc6837af828 is an unknown value
RSP=0x00007fc6837af5d0 is an unknown value
RBP=0x00007fc6837af670 is an unknown value
RSI=0x00000001003b7c28 is pointing into metadata
RDI=0x00000001003b7c28 is pointing into metadata
R8 =0x0000000000000003 is an unknown value
R9 =0x0000000000000001 is an unknown value
R10=0x0000000000000000 is an unknown value
R11=0x0000000000000002 is an unknown value
R12=0x00007fc68072bfe8 is pointing into metadata
R13=0x0000000000000000 is an unknown value
R14=0x0000000000000000 is an unknown value
R15=0x00007fc5d405b500 is an unknown value
Stack: [0x00007fc6836b0000,0x00007fc6837b1000], sp=0x00007fc6837af5d0, free space=1021k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x8c5321] MemberNameTable::adjust_method_entries(InstanceKlass*, bool*)+0x91
V [libjvm.so+0x7af039] VM_RedefineClasses::redefine_single_class(_jclass*, Klass*, Thread*)+0x949
V [libjvm.so+0x7af54b] VM_RedefineClasses::doit()+0xab
V [libjvm.so+0xacd405] VM_Operation::evaluate()+0x55
V [libjvm.so+0xacb7da] VMThread::evaluate_operation(VM_Operation*)+0xba
V [libjvm.so+0xacbb5e] VMThread::loop()+0x1ce
V [libjvm.so+0xacbfd0] VMThread::run()+0x70
V [libjvm.so+0x924698] java_start(Thread*)+0x108
VM_Operation (0x00007fc59d7be310): RedefineClasses, mode: safepoint, requested by thread 0x00007fc664001800
。。。
。。。
Events (10 events):
Event: 72628.683 Thread 0x00007fc608019000 Thread exited: 0x00007fc608019000
Event: 72629.248 Executing VM operation: RevokeBias
Event: 72629.248 Executing VM operation: RevokeBias done
Event: 72630.807 Executing VM operation: RedefineClasses
Event: 72631.004 Executing VM operation: RedefineClasses done
Event: 72631.010 Executing VM operation: RedefineClasses
Event: 72631.191 Executing VM operation: RedefineClasses done
Event: 72631.196 Executing VM operation: RedefineClasses
Event: 72631.387 Executing VM operation: RedefineClasses done
Event: 72631.389 Executing VM operation: RedefineClasses
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