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Diffstat (limited to 'results/scraper/box64/2053')
| -rw-r--r-- | results/scraper/box64/2053 | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/results/scraper/box64/2053 b/results/scraper/box64/2053 new file mode 100644 index 000000000..685ab078a --- /dev/null +++ b/results/scraper/box64/2053 @@ -0,0 +1,81 @@ +[LA64_DYNAREC] Linux x64 jdk23 infinite loop on not support AMCAS platform +Hi, + +Testcase: + +``` +./build/box64 /yourpath/jdk-23/bin/java -version +``` + +Reproduced infinite loop[2] on not support `AMCAS` platform, for example: 3A5000. But 3A6000, which supports `AMCAS` and `AMBH`, will not reproduce this issue. The root cause is `LL.W/SC.W` not equivalent to `cmpxchg8` so `native_lock_write_b` AKA `la64_lock_cas_b_slow` always return `1`[3]. We often use `AMCAS` to codegen the `compareAndExchangeB` node, but there is `predicate(UseAMCAS)` restrict[4], and there is also `UseAMCAS == true` assert[5] for `cmpxchg8` macroAssembler. + +Build options: +``` +cmake .. -DLARCH64=ON -DLARCH64_DYNAREC=ON +``` + +[1] Linux/x64 OpenJDK: https://download.java.net/java/GA/jdk23.0.1/c28985cbf10d4e648e4004050f8781aa/11/GPL/openjdk-23.0.1_linux-x64_bin.tar.gz + +[2] +``` +22263|0x3f01ca9736: Calling pthread_mutex_lock(0x3F0254EBC0, 0x3F0254EBC0, 0xFFFFFFFD, ...) => return 0x0 +22263|0x3f01ca9893: Calling __tls_get_addr(0x3F024DB3D8, 0x64, 0xFFFFFFFD, ...) => return 0xFFD0010B18 +22263|0x3f01d01f53: Calling clock_gettime(0x1, 0xFFE6BBBE00, 0xFFFFFFFD, ...) => return 0x0 +22263|0x3f01d01ff7: Calling pthread_cond_timedwait(0x3F0254EBE8, 0x3F0254EBC0, 0xFFE6BBBDF0, ...) =>^C +Thread 1 "java" received signal SIGINT, Interrupt. +0x000000fff7d196f8 in __GI___pthread_timedjoin_ex (threadid=1099340214128, threadid@entry=<error reading variable: value has been optimized out>, thread_return=0xfff7cdabf8, thread_return@entry=<error reading variable: value has been optimized out>, abstime=0x0, abstime@entry=<error reading variable: value has been optimized out>, block=<error reading variable: value has been optimized out>) at pthread_join_common.c:89 + +(gdb) info threads + Id Target Id Frame +* 1 Thread 0xfff7ced3c0 (LWP 22237) "java" 0x000000fff7d196f8 in __GI___pthread_timedjoin_ex (threadid=1099340214128, threadid@entry=<error reading variable: value has been optimized out>, thread_return=0xfff7cdabf8, thread_return@entry=<error reading variable: value has been optimized out>, abstime=0x0, abstime@entry=<error reading variable: value has been optimized out>, block=<error reading variable: value has been optimized out>) at pthread_join_common.c:89 + 2 Thread 0xfff5c86f70 (LWP 22244) "java" 0x0000000034845cd8 in cmp8 (emu=emu@entry=0x368054a0, d=100 'd', s=s@entry=100 'd') at /home/zhaixiang/repo/box64/src/emu/x64primop.c:326 + 3 Thread 0xfff4a62f70 (LWP 22258) "GC Thread#0" futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0xfff00ab6a8) at ../sysdeps/unix/sysv/linux/futex-internal.h:205 + 4 Thread 0xfff4436f70 (LWP 22259) "G1 Main Marker" futex_wait_cancelable (private=0, expected=0, futex_word=0x3f0254f310) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 + 5 Thread 0xffe7ffef70 (LWP 22260) "G1 Conc#0" futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0xfff00c3198) at ../sysdeps/unix/sysv/linux/futex-internal.h:205 + 6 Thread 0xffe7562f70 (LWP 22261) "G1 Refine#0" futex_wait_cancelable (private=0, expected=0, futex_word=0x3f0254f310) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 + 7 Thread 0xffe6f56f70 (LWP 22262) "G1 Service" futex_wait_cancelable (private=0, expected=0, futex_word=0x3f0254f310) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 + 8 Thread 0xffe66b6f70 (LWP 22263) "VM Periodic Tas" futex_reltimed_wait_cancelable (private=0, reltime=0xffe66b60b0, expected=0, futex_word=0x3f0254ec10) at ../sysdeps/unix/sysv/linux/futex-internal.h:142 + 9 Thread 0xffe540af70 (LWP 22303) "VM Thread" futex_wait_cancelable (private=0, expected=0, futex_word=0x3f0254da10) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 +(gdb) thread 2 +[Switching to thread 2 (Thread 0xfff5c86f70 (LWP 22244))] +#0 0x0000000034845cd8 in cmp8 (emu=emu@entry=0x368054a0, d=100 'd', s=s@entry=100 'd') at /home/zhaixiang/repo/box64/src/emu/x64primop.c:326 +326 RESET_FLAGS(emu); +(gdb) bt +#0 0x0000000034845cd8 in cmp8 (emu=emu@entry=0x368054a0, d=100 'd', s=s@entry=100 'd') at /home/zhaixiang/repo/box64/src/emu/x64primop.c:326 +#1 0x0000000034f08bf4 in RunF0 (emu=emu@entry=0x368054a0, rex=..., rex@entry=..., addr=<optimized out>) at /home/zhaixiang/repo/box64/src/emu/x64runf0.c:303 +#2 0x0000000034ee3d3c in Run (emu=emu@entry=0x368054a0, step=<optimized out>, step@entry=1) at /home/zhaixiang/repo/box64/src/emu/x64run.c:1912 +#3 0x0000000034831da4 in DynaRun (emu=emu@entry=0x368054a0) at /home/zhaixiang/repo/box64/src/dynarec/dynarec.c:217 +#4 0x00000000348602fc in pthread_routine (p=0x367ada10) at /home/zhaixiang/repo/box64/src/libtools/threads.c:257 +#5 0x000000fff7d182b0 in start_thread (arg=<optimized out>) at pthread_create.c:486 +#6 0x000000fff7ef5744 in __thread_start () at ../sysdeps/unix/sysv/linux/loongarch/clone.S:89 +``` + +[3] +``` +... + case 0xB0: /* CMPXCHG Eb,Gb */ + CHECK_FLAGS(emu); + nextop = F8; + GETGB; + GETEB(0); +#if defined(DYNAREC) && !defined(TEST_INTERPRETER) + do { + tmp8u = native_lock_read_b(EB); + cmp8(emu, R_AL, tmp8u); + if(ACCESS_FLAG(F_ZF)) { +=> tmp32s = native_lock_write_b(EB, GB); + } else { + R_AL = tmp8u; + tmp32s = 0; + } + } while(tmp32s); +#else +... +``` + +[4] `predicate(UseAMCAS)` in `compareAndExchangeB` node: https://github.com/loongson/jdk/blob/loongarch-port/src/hotspot/cpu/loongarch/loongarch_64.ad#L11591 + +[5] `assert(UseAMCAS == true, "UseAMCAS == true")` in `cmpxchg8` macroAssembler: https://github.com/loongson/jdk/blob/loongarch-port/src/hotspot/cpu/loongarch/macroAssembler_loongarch.cpp#L1707 + +Thanks, +Leslie Zhai \ No newline at end of file |