tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.06.02a head: 5216948905dd07a84cef8a7dc72c2ec076802efd commit: 92ebbb71443dced2019cd24b737ce60b03a29e10 [85/90] EXP kernel/smp: Provide CSD lock timeout diagnostics config: i386-randconfig-c001-20200605 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>
All errors (new ones prefixed by >>, old ones prefixed by <<):
ld: kernel/smp.o: in function `csd_lock_wait':
>> kernel/smp.c:122: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:128: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:136: undefined reference to `__umoddi3'
ld: kernel/smp.c:136: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:122: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:128: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:136: undefined reference to `__umoddi3'
ld: kernel/smp.c:136: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:122: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:128: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:136: undefined reference to `__umoddi3'
ld: kernel/smp.c:136: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:122: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:128: undefined reference to `__udivdi3'
>> ld: kernel/smp.c:136: undefined reference to `__umoddi3'
ld: kernel/smp.c:136: undefined reference to `__udivdi3'
vim +122 kernel/smp.c
107
108 /*
109 * csd_lock/csd_unlock used to serialize access to per-cpu csd resources
110 *
111 * For non-synchronous ipi calls the csd can still be in use by the
112 * previous function call. For multi-cpu calls its even more interesting
113 * as we'll have to ensure no other cpu is observing our csd.
114 */
115 static __always_inline void csd_lock_wait(call_single_data_t *csd)
116 {
117 int bug_id = 0;
118 int cpu;
119 call_single_data_t *cpu_cur_csd;
120 u64 ts0, ts1, ts2, ts_delta;
121
> 122 ts1 = ts0 = sched_clock() / 1000 / 1000;
123 for (;;) {
124 unsigned long flags = READ_ONCE(csd->flags);
125
126 if (!(flags & CSD_FLAG_LOCK))
127 break;
> 128 ts2 = sched_clock() / 1000 / 1000;
129 ts_delta = ts2 - ts1;
130 if (unlikely(ts_delta > CSD_LOCK_TIMEOUT)) {
131 bug_id = atomic_inc_return(&csd_bug_count);
132 cpu = csd->cpu;
133 smp_mb(); // No stale cur_csd values!
134 cpu_cur_csd = per_cpu(cur_csd, cpu);
135 smp_mb(); // No refetching cur_csd values!
> 136 printk("csd: Detected non-responsive CSD lock
> (#%d) on CPU#%d, waiting %Ld.%03Ld secs for CPU#%02d %pf(%ps), currently
> %s.\n",
137 bug_id, raw_smp_processor_id(),
138 ts_delta/1000ULL, ts_delta % 1000ULL,
cpu,
139 csd->func, csd->info,
140 !cpu_cur_csd ? "unresponsive"
141 : csd == cpu_cur_csd
142 ? "handling this
request"
143 : "handling prior
request");
144 if (!trigger_single_cpu_backtrace(cpu))
145 dump_cpu_task(cpu);
146 if (!cpu_cur_csd) {
147 printk("csd: Re-sending CSD lock (#%d)
IPI from CPU#%02d to CPU#%02d\n", bug_id, raw_smp_processor_id(), cpu);
148 arch_send_call_function_single_ipi(cpu);
149 }
150 dump_stack();
151 ts1 = ts2;
152 }
153 cpu_relax();
154 }
155 smp_acquire__after_ctrl_dep();
156 if (unlikely(bug_id))
157 printk("csd: CSD lock (#%d) got unstuck on CPU#%02d,
CPU#%02d released the lock after all. Phew!\n", bug_id, raw_smp_processor_id(),
cpu);
158 }
159
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.config.gz
Description: application/gzip
