[缺陷描述]： kernel-selftests测试套pidfd.pidfd_test用例失败，pidfd_clone函数创建指定进程能返回进程id，但不能执行函数并报错Bail out! 测试日志： #./pidfd_test TAP version 13 1..8 # Parent: pid: 1387844 # Parent: Waiting for Child (1387845) to complete. # Time waited for child: 0 Bail out! pidfd_poll check for premature notification on child thread exec test: Failed # Planned tests != run tests (8 != 0) # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 [重现概率]： 必现 [重现环境]： 环境信息：倚天710机器 11.163.178.238 #uname -r 6.6.71-3_rc1.al8.aarch64 #cat /etc/os-release NAME="Alibaba Cloud Linux" VERSION="3 (Soaring Falcon)" ID="alinux" ID_LIKE="rhel fedora centos anolis" VERSION_ID="3" UPDATE_ID="10" PLATFORM_ID="platform:al8" PRETTY_NAME="Alibaba Cloud Linux 3 (Soaring Falcon)" ANSI_COLOR="0;31" HOME_URL="https://www.aliyun.com/" #lscpu Architecture: aarch64 Byte Order: Little Endian CPU(s): 128 On-line CPU(s) list: 0-127 Thread(s) per core: 1 Core(s) per socket: 128 Socket(s): 1 NUMA node(s): 2 Vendor ID: ARM BIOS Vendor ID: T-HEAD Model: 0 Model name: Neoverse-N2 BIOS Model name: Yitian710-128 Stepping: r0p0 CPU MHz: 2750.000 BogoMIPS: 100.00 Hypervisor vendor: Alibaba Virtualization type: full L1d cache: 64K L1i cache: 64K L2 cache: 1024K L3 cache: 65536K NUMA node0 CPU(s): 0-63 NUMA node1 CPU(s): 64-127 Flags: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm sb dcpodp sve2 sveaes svepmull svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16 dgh #free -h total used free shared buff/cache available Mem: 125Gi 3.6Gi 121Gi 12Mi 1.0Gi 122Gi Swap: 2.0Gi 0B 2.0Gi #cat /proc/cmdline BOOT_IMAGE=(hd0,gpt2)/boot/vmlinuz-6.6.71-3_rc1.al8.aarch64 root=UUID=d0af582f-7147-41de-85e3-deb2e14cde99 ro biosdevname=0 rd.driver.pre=ahci iommu.passthrough=1 iommu.strict=0 nospectre_bhb ssbd=force-off systemd.unified_cgroup_hierarchy=0 cgroup.memory=nokmem console=ttyS0,115200 fsck.repair=yes crashkernel=0M-2G:0M,2G-256G:256M,256G-1024G:320M,1024G-:384M #gcc --version gcc (GCC) 12.3.0 20230508 (Red Hat 12.3.0-1) Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE [重现步骤]： # 下载并编译用例 wget 内核对应src.rpm包（从这里获取https://koji.alibaba-inc.com/taskinfo?taskID=730244） rpm -ivh xxx.src.rpm 默认安装到/root下 yum install yum-utils yum-builddep -y /root/rpmbuild/SPECS/kernel.spec 自动安装前置依赖包 需要yum-utils rpmbuild -bp /root/rpmbuild/SPECS/kernel.spec # 这个步骤会打相关的patch， 解压缩tar包，生成BUILD目录 cd /root/rpmbuild/BUILD/kernel-*/linux-* make -C tools/testing/selftests/ cd /root/rpmbuild/BUILD/kernel-*/linux-*/tools/testing/selftests/pidfd 执行用例 ./pidfd_test [期望结果]： 用例执行pass [实际结果]： 用例执行失败，报Bail out! pidfd_poll check for premature notification on child thread exec test: Failed [分析定位] pidfd_clone函数创建指定进程能返回进程id，但不能执行函数并报错Bail out! 具体失败位置如下： 443 static void test_pidfd_poll_exec(int use_waitpid) 444 { 445 int pid, pidfd = 0; 446 int status, ret; 447 time_t prog_start = time(NULL); 448 const char *test_name = "pidfd_poll check for premature notification on child thread exec"; 449 450 ksft_print_msg("Parent: pid: %d\n", getpid()); 451 pid = pidfd_clone(CLONE_PIDFD, &pidfd, child_poll_exec_test); 452 perror 453 if (pid < 0) 454 ksft_exit_fail_msg("%s test: pidfd_clone failed (ret %d, errno %d)\n", 455 test_name, pid, errno); 456 457 ksft_print_msg("Parent: Waiting for Child (%d) to complete.\n", pid); 458 459 if (use_waitpid) { 460 ret = waitpid(pid, &status, 0); 461 if (ret == -1) 462 ksft_print_msg("Parent: error\n"); 463 464 if (ret == pid) 465 ksft_print_msg("Parent: Child process waited for.\n"); 466 } else { 467 poll_pidfd(test_name, pidfd); 468 } 469 470 time_t prog_time = time(NULL) - prog_start; 471 472 ksft_print_msg("Time waited for child: %lu\n", prog_time); 473 474 close(pidfd); 475 476 if (prog_time < CHILD_THREAD_MIN_WAIT || prog_time > CHILD_THREAD_MIN_WAIT + 2) 477 ksft_exit_fail_msg("%s test: Failed\n", test_name); 478 else 479 ksft_test_result_pass("%s test: Passed\n", test_name); 480 }
在debug的时候有一个意外发现： 在pidfd_clone中添加一个无用变量ret，并且赋一个初始值0，测试用例就可以通过。 static pid_t pidfd_clone(int flags, int *pidfd, int (*fn)(void *)) { size_t stack_size = 1024; char *stack[1024] = { 0 }; int ret = 0; #ifdef __ia64__ return __clone2(fn, stack, stack_size, flags | SIGCHLD, NULL, pidfd); #else return clone(fn, stack + stack_size, flags | SIGCHLD, NULL, pidfd); #endif } 但是如果不给ret赋初始值，那么测试用例就会fail。 对比两者的汇编，发现通过的用例多了一行汇编指令： 4015fc: b92037ff str wzr, [sp, #8244] 其中wzr是清零指令 需要arm或者编译器的同学帮忙看一下
使用strace追踪测试用例的syscall，发现是因为收到SIGCHLD才结束了epoll_wait，导致提前返回 使用bpftrace追踪child退出的事件，抓到其exit code为0x87,并且多次重复测试exit code都是0x87： # Parent: Waiting for Child (764173) to complete. Process exited - PID: 764173, COMM: pidfd_test , Exit Code: 0x87 在日志中看到了core dump的日志： Mar 10 15:23:37 t50a07416.sqa.eu95 systemd[1]: Started Process Core Dump (PID 764174/UID 0). Mar 10 15:23:37 t50a07416.sqa.eu95 systemd-coredump[764175]: Process 764173 (pidfd_test) of user 0 dumped core. Stack trace of thread 764173: #0 0x00000000004020b8 n/a (/root/rpmbuild/BUILD/kernel-6.6.71-3_rc1.al8/linux-6.6.71-3_rc1.al8.aarch64/tools/testing/selftests/pidfd/pidfd_test) #1 0x0000ffffab4b8f9c thread_start (libc.so.6)
(In reply to CruzZhao from comment #2) > 使用strace追踪测试用例的syscall，发现是因为收到SIGCHLD才结束了epoll_wait，导致提前返回 > 使用bpftrace追踪child退出的事件，抓到其exit code为0x87,并且多次重复测试exit code都是0x87： > # Parent: Waiting for Child (764173) to complete. > Process exited - PID: 764173, COMM: pidfd_test , Exit Code: 0x87 > > > 在日志中看到了core dump的日志： > > Mar 10 15:23:37 t50a07416.sqa.eu95 systemd[1]: Started Process Core Dump > (PID 764174/UID 0). > Mar 10 15:23:37 t50a07416.sqa.eu95 systemd-coredump[764175]: Process 764173 > (pidfd_test) of user 0 dumped core. > > Stack trace of thread 764173: > #0 0x00000000004020b8 n/a > (/root/rpmbuild/BUILD/kernel-6.6.71-3_rc1.al8/linux-6.6.71-3_rc1.al8.aarch64/ > tools/testing/selftests/pidfd/pidfd_test) > #1 0x0000ffffab4b8f9c thread_start (libc.so.6) 找到了coredump文件，进行分析，发现child是在thread_start阶段收到了SIGBUS信号而退出的： Using host libthread_db library "/lib64/libthread_db.so.1". Core was generated by `./pidfd_test'. Program terminated with signal SIGBUS, Bus error. #0 child_poll_exec_test (args=0x0) at pidfd_test.c:428 428 { [Current thread is 1 (LWP 764173)] (gdb) bt #0 child_poll_exec_test (args=0x0) at pidfd_test.c:428 #1 0x0000ffffab4b8f9c in thread_start () from /lib64/libc.so.6 (gdb) disas thread_start Dump of assembler code for function thread_start: 0x0000ffffab4b8f90 <+0>: mov x29, #0x0 // #0 0x0000ffffab4b8f94 <+4>: mov x0, x12 0x0000ffffab4b8f98 <+8>: blr x10 0x0000ffffab4b8f9c <+12>: mov x8, #0x5d // #93 0x0000ffffab4b8fa0 <+16>: svc #0x0 End of assembler dump.
[ 211.405296] CPU: 83 PID: 14910 Comm: pidfd_test Kdump: loaded Tainted: G W E 6.6.71-cbp.git.3b16f8301.al8.aarch64 #1 [ 211.405306] Hardware name: AlibabaCloud AliServer-Xuanwu2.0AM-1UC1P-5B/AS1111MG1, BIOS 1.2.M1.AL.P.157.00 07/29/2023 [ 211.405308] Call trace: [ 211.405311] dump_backtrace+0x9c/0x120 [ 211.405319] show_stack+0x1c/0x58 [ 211.405322] dump_stack_lvl+0x70/0xb8 [ 211.405328] dump_stack+0x14/0x20 [ 211.405331] __send_signal_locked+0x230/0x430 [ 211.405337] send_signal_locked+0xdc/0x128 [ 211.405339] force_sig_info_to_task+0x9c/0x168 [ 211.405341] force_sig_fault+0x60/0x98 [ 211.405344] arm64_notify_die+0x80/0xd0 [ 211.405345] do_sp_pc_abort+0x30/0x38 [ 211.405348] el0_sp+0x44/0x178 [ 211.405351] el0t_64_sync_handler+0xa4/0x128 [ 211.405353] el0t_64_sync+0x17c/0x180 [ 211.405355] SIGBUS singal current pid:14910, comm:pidfd_test [ 211.405356] send_singal current pid:14910, comm:pidfd_test, current sig:7 抓取了发生信号异常的堆栈，其中根据el0_sp函数以及代码中的 case ESR_ELx_EC_SP_ALIGN: el0_sp(regs, esr); break; 对应的ESR_ELx_EC_SP_ALIGN的异常，可以判定是用户态的栈对齐出错导致的子进程异常退出。
打开异常trace，确认为SP/PC alignment exception [root@t50a07416.sqa.eu95 /root/rpmbuild/BUILD/kernel-6.6.71-3_rc1.al8/linux-6.6.71-3_rc1.al8.aarch64/tools/testing/selftests/pidfd] #echo 1 > /proc/sys/debug/exception-trace [root@t50a07416.sqa.eu95 /root/rpmbuild/BUILD/kernel-6.6.71-3_rc1.al8/linux-6.6.71-3_rc1.al8.aarch64/tools/testing/selftests/pidfd] #./pidfd_test TAP version 13 1..8 # Parent: pid: 15094 # Parent: Waiting for Child (15095) to complete. test_pidfd_poll_exec: poll_pidfd: pidfd: 3 events: 1, data.ptr: 0x3, data.fd: 3, data.u32: 3, data.u64: 3 epoll_wait return value: 1, errno: 0 # Time waited for child: 0 Bail out! pidfd_poll check for premature notification on child thread exec test: Failed # Planned tests != run tests (8 != 0) # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 [root@t50a07416.sqa.eu95 /root/rpmbuild/BUILD/kernel-6.6.71-3_rc1.al8/linux-6.6.71-3_rc1.al8.aarch64/tools/testing/selftests/pidfd] #dmesg | less [root@t50a07416.sqa.eu95 /root/rpmbuild/BUILD/kernel-6.6.71-3_rc1.al8/linux-6.6.71-3_rc1.al8.aarch64/tools/testing/selftests/pidfd] #dmesg | tail -n 20 [ 21.301594] mlx5_core 0000:b1:00.0: shared_fdb:0 mode:queue_affinity [ 26.604007] mlx5_core 0000:b1:00.0: lag map: port 1:1 port 2:1 [ 26.604064] mlx5_core 0000:b1:00.0: lag map: port 1:1 port 2:2 [ 428.004788] pidfd_test[15095]: unhandled exception: SP Alignment, ESR 0x000000009a000000, SP/PC alignment exception in pidfd_test[400000+4000] [ 428.004811] CPU: 17 PID: 15095 Comm: pidfd_test Kdump: loaded Tainted: G W E 6.6.71-3_rc1.al8.aarch64 #1 [ 428.004815] Hardware name: AlibabaCloud AliServer-Xuanwu2.0AM-1UC1P-5B/AS1111MG1, BIOS 1.2.M1.AL.P.157.00 07/29/2023 [ 428.004817] pstate: 60001800 (nZCv daif -PAN -UAO -TCO -DIT +SSBS BTYPE=-c) [ 428.004819] pc : 00000000004020ec [ 428.004820] lr : 0000ffff9a8b8f9c [ 428.004821] sp : 0000ffffd6611738 [ 428.004822] x29: 0000000000000000 x28: 0000000000000000 x27: 0000000000000000 [ 428.004825] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 [ 428.004827] x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000400e80 [ 428.004830] x20: 0000000000000000 x19: 0000000000402640 x18: 0000000000000000 [ 428.004832] x17: 00000000004200d8 x16: 0000ffff9a8b8f40 x15: 0000ffffd66115d3 [ 428.004835] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 428.004837] x11: 0000000000001011 x10: 00000000004020ec x9 : 000000000000000a [ 428.004839] x8 : 00000000000000dc x7 : 00000000fffffffb x6 : 000000000000000a [ 428.004842] x5 : 0000ffffd6611738 x4 : 000000000000000a x3 : 0000ffffd6611738 [ 428.004844] x2 : 0000ffffd661176c x1 : 0000ffffd6611738 x0 : 0000000000000000
根据ARM ARM： D1.3.10.2 SP alignment checking RRDMXG When the SP is used as the base address of a calculation, regardless of any offset applied by the instruction, if bits [3:0] of the SP are not 0b0000, there is a misaligned SP. If SP alignment checking is enabled, then the execution of a load or store using the SP with a misaligned SP generates a synchronous SP Alignment exception on that load or store. 根据sp : 0000ffffd6611738 低4位为0b1000 产生SP Alignment exception符合预期。
修改测试用例，增加如下打印，确认栈帧的地址是否16字节对齐： $git diff diff --git a/tools/testing/selftests/pidfd/pidfd_test.c b/tools/testing/selftests/pidfd/pidfd_test.c index c081ae91313a..d67f131cad08 100644 --- a/tools/testing/selftests/pidfd/pidfd_test.c +++ b/tools/testing/selftests/pidfd/pidfd_test.c @@ -34,6 +34,7 @@ static pid_t pidfd_clone(int flags, int *pidfd, int (*fn)(void *)) { size_t stack_size = 1024; char *stack[1024] = { 0 }; + printf("Address of stack: %p\n", (void*)&stack); #ifdef __ia64__ return __clone2(fn, stack, stack_size, flags | SIGCHLD, NULL, pidfd); #./pidfd_test TAP version 13 1..8 # Parent: pid: 1082141 Address of stack: 0xffffde49baa8 # Parent: Waiting for Child (1082142) to complete. test_pidfd_poll_exec: poll_pidfd: pidfd: 3 events: 1, data.ptr: 0x3, data.fd: 3, data.u32: 3, data.u64: 3 epoll_wait return value: 1, errno: 0 # Time waited for child: 1 Bail out! pidfd_poll check for premature notification on child thread exec test: Failed # Planned tests != run tests (8 != 0) # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 [root@t50a07416.sqa.eu95 /root/rpmbuild/BUILD/kernel-6.6.71-3_rc1.al8/linux-6.6.71-3_rc1.al8.aarch64/tools/testing/selftests/pidfd] #dmesg | tail -n 20 [ 3214.210919] x8 : 00000000000000dc x7 : 00000000fffffffb x6 : 000000000000000a [ 3214.210921] x5 : 0000ffffebf27268 x4 : 000000000000000a x3 : 0000ffffebf27268 [ 3214.210923] x2 : 0000ffffebf2729c x1 : 0000ffffebf27268 x0 : 0000000000000000 [48628.713023] pidfd_test[1082142]: unhandled exception: SP Alignment, ESR 0x000000009a000000, SP/PC alignment exception in pidfd_test[400000+4000] [48628.713049] CPU: 21 PID: 1082142 Comm: pidfd_test Kdump: loaded Tainted: G W E 6.6.71-3_rc1.al8.aarch64 #1 [48628.713051] Hardware name: AlibabaCloud AliServer-Xuanwu2.0AM-1UC1P-5B/AS1111MG1, BIOS 1.2.M1.AL.P.157.00 07/29/2023 [48628.713053] pstate: 60001800 (nZCv daif -PAN -UAO -TCO -DIT +SSBS BTYPE=-c) [48628.713055] pc : 0000000000402100 [48628.713056] lr : 0000ffff98288f9c [48628.713056] sp : 0000ffffde49daa8 [48628.713057] x29: 0000000000000000 x28: 0000000000000000 x27: 0000000000000000 [48628.713060] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 [48628.713062] x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000400e80 [48628.713065] x20: 0000000000000000 x19: 0000000000402650 x18: 0000000000000000 [48628.713067] x17: 00000000004200d8 x16: 0000ffff98288f40 x15: 0000ffffde49b92c [48628.713070] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [48628.713072] x11: 0000000000001011 x10: 0000000000402100 x9 : 0000000000000010 [48628.713074] x8 : 00000000000000dc x7 : 3861616239346564 x6 : 000000000000000a [48628.713077] x5 : 0000ffffde49daa8 x4 : 000000000000000a x3 : 0000ffffde49daa8 [48628.713079] x2 : 0000ffffde49dadc x1 : 0000ffffde49daa8 x0 : 0000000000000000 sp 0000ffffde49daa8即为stack的地址，非16字节对齐。
5.10.134内核同样存在这个问题： #./pidfd_test TAP version 13 1..8 # Parent: pid: 1838033 Address of stack: 0xfffffd787b98 # Parent: Waiting for Child (1838034) to complete. # Time waited for child: 0 Bail out! pidfd_poll check for premature notification on child thread exec test: Failed # Planned tests != run tests (8 != 0) # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 #dmesg | tail -n 25 [45042.523703] 1 retries left [76530.335814] ipmi_si IPI0001:00: IPMI BT: timeout in RD_WAIT [ ] [76530.335821] 1 retries left [82112.593964] pidfd_test[1838034]: unhandled exception: SP Alignment, ESR 0x9a000000, SP/PC alignment exception in pidfd_test[400000+4000] [82112.593980] CPU: 100 PID: 1838034 Comm: pidfd_test Not tainted 5.10.134-010.ali5000.al8.aarch64 #1 [82112.593981] Hardware name: Huawei TaiShan 200 (Model 2280)/BC82AMDD, BIOS 1.91 07/29/2022 [82112.593984] pstate: 60000000 (nZCv daif -PAN -UAO -TCO BTYPE=--) [82112.593985] pc : 00000000004020d0 [82112.593986] lr : 0000ffff8b9878dc [82112.593987] sp : 0000fffffd789b98 [82112.593988] x29: 0000000000000000 x28: 0000000000000000 [82112.593991] x27: 0000000000000000 x26: 0000000000000000 [82112.593993] x25: 0000000000000000 x24: 0000000000000000 [82112.593995] x23: 0000000000000000 x22: 0000000000000000 [82112.593998] x21: 0000000000400e80 x20: 0000000000000000 [82112.594000] x19: 00000000004025f0 x18: 0000000000000002 [82112.594002] x17: 00000000004200d8 x16: 0000ffff8b987880 [82112.594005] x15: 0000fffffd787a1c x14: 0000000000000000 [82112.594007] x13: 0000000000000000 x12: 0000000000000000 [82112.594009] x11: 0000000000001011 x10: 00000000004020d0 [82112.594011] x9 : 0000000000000010 x8 : 00000000000000dc [82112.594014] x7 : 3839623738376466 x6 : 000000000000000a [82112.594016] x5 : 0000fffffd789b98 x4 : 000000000000000a [82112.594018] x3 : 0000fffffd789b98 x2 : 0000fffffd789bcc [82112.594020] x1 : 0000fffffd789b98 x0 : 0000000000000000
The PR Link: https://gitee.com/anolis/cloud-kernel/pulls/4843
在6.6.71-3.100_rc2.2.al8.aarch64内核上，pidfd.pidfd_test用例执行成功，问题已解决 #./pidfd_test TAP version 13 1..8 # Parent: pid: 1337809 # Parent: Waiting for Child (1337810) to complete. # Child (pidfd): starting. pid 1337810 tid 1337810 # Child Thread: starting. pid 1337810 tid 1337811 ; and sleeping # Child Thread: doing exec of sleep # Time waited for child: 3 ok 1 pidfd_poll check for premature notification on child thread exec test: Passed # Parent: pid: 1337809 # Parent: Waiting for Child (1337832) to complete. # Child (pidfd): starting. pid 1337832 tid 1337832 # Child Thread: starting. pid 1337832 tid 1337833 ; and sleeping # Child Thread: doing exec of sleep # Parent: Child process waited for. # Time waited for child: 3 ok 2 pidfd_poll check for premature notification on child thread exec test: Passed # Parent: pid: 1337809 # Parent: Waiting for Child (1337873) to complete. # Child: starting. pid 1337873 tid 1337873 # Child Thread: starting. pid 1337873 tid 1337874 ; and sleeping # Child Thread: starting. pid 1337873 tid 1337875 ; and sleeping # Child Thread: DONE. pid 1337873 tid 1337874 # Child Thread: DONE. pid 1337873 tid 1337875 # Time since child exit: 3 ok 3 pidfd_poll check for premature notification on non-emptygroup leader exit test: Passed # Parent: pid: 1337809 # Parent: Waiting for Child (1337888) to complete. # Child: starting. pid 1337888 tid 1337888 # Child Thread: starting. pid 1337888 tid 1337889 ; and sleeping # Child Thread: starting. pid 1337888 tid 1337890 ; and sleeping # Child Thread: DONE. pid 1337888 tid 1337889 # Child Thread: DONE. pid 1337888 tid 1337890 # Parent: Child process waited for. # Time since child exit: 3 ok 4 pidfd_poll check for premature notification on non-emptygroup leader exit test: Passed ok 5 pidfd_send_signal check for support test: pidfd_send_signal() syscall is supported. Tests can be executed ok 6 pidfd_send_signal send SIGUSR1 test: Sent signal # waitpid WEXITSTATUS=0 ok 7 pidfd_send_signal signal exited process test: Failed to send signal as expected # pid to recycle is 1000 ok 8 # SKIP pidfd_send_signal signal recycled pid test: Skipping test # Totals: pass:7 fail:0 xfail:0 xpass:0 skip:1 error:0 [root@v43c07451.sqa.na131 /var/tmp/tone/run/kernel-selftests/pidfd] #echo $? 0 [root@v43c07451.sqa.na131 /var/tmp/tone/run/kernel-selftests/pidfd] #uname -r 6.6.71-3.100_rc2.2.al8.aarch64