Re: Kernel crash before login prompt
- Reply: Sha Faisal : "Re: Kernel crash before login prompt"
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Date: Fri, 30 Jun 2023 10:55:47 UTC
On 2023-06-30 10:48, Mahesh Vardhamanaiah wrote: > Hi Andrew, > > We are observing that self is getting -65536 at line 1329 in > sched_pickcpu() before panic. What is the disassembly around reading the cpuid? It looks like it is getting 0xffff0000 when it should be zero. > > From the code flow > > sched_add [1](struct thread [2] *td [3], int flags [4])-> > sched_pickcpu()->PCPU_GET > > as below > > static int > > 1321 [5] sched_pickcpu [6](struct thread [2] *td [3], int flags [4]) > > 1322 [7] { > > 1323 [8] struct cpu_group [9] *cg [10], *ccg; > > 1324 [11] struct td_sched [12] *ts [13]; > > 1325 [14] struct tdq [15] *tdq [15]; > > 1326 [16] cpuset_t [17] *mask [18]; > > 1327 [19] int cpu [20], pri, r [21], self [22], intr; > > 1328 [23] > > 1329 [24] self [22] = PCPU_GET [25](cpuid [26]); > > PCPU_GET is defined differently in Freebsd14 compared to Freebsd12 but > I am unable to dump the pcpup in db> prompt is it proper ? > > Is it expected to be a global ? You can print all pcpu structs with "show allpcpu". Andrew