numad

#12 Division by zero on node update
Opened by scop. Modified

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I have a numad crash that actually occurs on an up to date Debian 12 system, https://packages.debian.org/bookworm/numad but from the backtrace it looks as if this could happen with the upstream version here as well, so reporting here.

Backtrace below, with some line offsets, which resolved point to https://pagure.io/numad/blob/3399d89305b6560e27e70aff4ad9fb403dedf947/f/numad.c#_1403 -- so a zero time_diff would provoke this.

No reproducer available, likely no more info beyond what's already in this report. Hopefully it's useful enough as is.

#0  0x0000555e67f38643 in update_nodes () at ./numad.c:1420
        time_diff = <optimized out>
        idle_ticks = 433
        cpu = <optimized out>
        num_lcpus = 8
        num_cpus_to_process = 0
        node_id = <optimized out>
        fd = <optimized out>
        old_cpu_data_buf = <optimized out>
        node_ix = 0
        fname = "/sys/devices/system/node/node4/meminfo\000\377", '\000' <repeats 16 times>, "[...]"
        buf = "Node 4 MemTotal:       33028092 kB\nNode 4 MemFree:         1298240 kB\nNode 4 MemUsed:        31729852 kB\nNode 4 SwapCached:", ' ' <repeats 12 times>, "0 kB\nNode 4 Active:", ' ' <repeats 12 times>, "10232 kB\nNode 4 Inactive:          "...
        time_stamp = <optimized out>
        sum_of_node_MBs_free = <optimized out>
        sum_of_node_CPUs_free = 0
        MBs_variance_sum = <optimized out>
        CPUs_variance_sum = <optimized out>
        MBs_variance = <optimized out>
        CPUs_variance = <optimized out>
#1  0x0000555e67f34f76 in main (argc=<optimized out>, argv=<optimized out>) at ./numad.c:2668
        interval = 5
        nodes = <optimized out>
        sid = <optimized out>
        sa = {__sigaction_handler = {sa_handler = 0x555e67f35090 <sig_handler>, sa_sigaction = 0x555e67f35090 <sig_handler>}, 
          sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 0, sa_restorer = 0x0}
        attr = {__size = '\000' <repeats 17 times>, "\020", '\000' <repeats 37 times>, __align = 0}
        tid = 140036653422272
        opt = <optimized out>
        C_flag = 0
        d_flag = 0
        H_flag = 0
        i_flag = 1
        K_flag = 0
        l_flag = 0
        m_flag = 0
        p_flag = 0
        r_flag = 0
        S_flag = 0
        t_flag = 0
        u_flag = 0
        v_flag = 0
        w_flag = 0
        x_flag = 0
        tmp_int = <optimized out>
        list_pid = 0
        daemon_pid = <optimized out>
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