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It is supposed to save the rules for the instructions before falling into slow path. Tested in glibc-2.28 before fixing: Thread 2 "xxxxxxx" hit Breakpoint 1, _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:149 149 stp x1, x2, [sp, #-32]! Missing separate debuginfos, use: dnf debuginfo-install libgcc-7.3.0-20190804.h24.aarch64 (gdb) ni _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:150 150 stp x3, x4, [sp, #16] (gdb) _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:157 157 mrs x4, tpidr_el0 (gdb) 158 ldr PTR_REG (1), [x0,#TLSDESC_ARG] (gdb) 159 ldr PTR_REG (0), [x4,#TCBHEAD_DTV] (gdb) 160 ldr PTR_REG (3), [x1,#TLSDESC_GEN_COUNT] (gdb) 161 ldr PTR_REG (2), [x0,#DTV_COUNTER] (gdb) 162 cmp PTR_REG (3), PTR_REG (2) (gdb) 163 b.hi 2f (gdb) 165 ldp PTR_REG (2), PTR_REG (3), [x1,#TLSDESC_MODID] (gdb) 166 add PTR_REG (0), PTR_REG (0), PTR_REG (2), lsl #(PTR_LOG_SIZE + 1) (gdb) 167 ldr PTR_REG (0), [x0] /* Load val member of DTV entry. */ (gdb) 168 cmp PTR_REG (0), #TLS_DTV_UNALLOCATED (gdb) 169 b.eq 2f (gdb) bt #0 _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:169 #1 0x0000ffffbe4fbb44 in OurFunction (threadId=4294967295) at /home/test/test_function.c:30 #2 0x0000000000400c08 in initaaa () at thread.c:58 #3 0x0000000000400c50 in thread_proc (param=0x0) at thread.c:71 #4 0x0000ffffbf6918bc in start_thread (arg=0xfffffffff29f) at pthread_create.c:486 #5 0x0000ffffbf5669ec in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:78 (gdb) ni _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:184 184 stp x29, x30, [sp,#-16*NSAVEXREGPAIRS]! (gdb) bt #0 _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:184 #1 0x0000ffffbe4fbb44 in OurFunction (threadId=4294967295) at /home/test/test_function.c:30 #2 0x0000000000000000 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) Co-authored-by: liqingqing <liqingqing3@huawei.com>