EulerOS 2.9 received sigsegv in function gettimeofday

[LoTmLumian]

I also tested in EulerOS 2.0 and CentOS 8.2, never got that signal.

Jemalloc VERSION: 5.2.0
My MALLOC_CONF: --with-malloc-conf=background_thread:true
Running in VM,
Arch: x86 (64bits)
CPU: 1U
Memory: 1G
OS: EulerOS 2.9

GDB information:

File Line:
https://github.com/jemalloc/jemalloc/blob/5.2.0/src/background_thread.c#L261

if (config_stats) {
=>	gettimeofday(&tv, NULL);

GDB disassembly:

BTW, context of rax is 0.

I disassembled background_thread_sleep() and gettimeofday() in other machine with greater memory (16G), I never saw add %al, (%rax). Besides, this segfault never occurs in other machine.

dmesg info:

Probability: Very high on virtual machines with small memory, in EulerOS 2.9.
If there are segfaults, they always occur at the beginning of process running.