Hi, On 11/30/2017 04:42 PM, Sebastian Andrzej Siewior wrote: >> root@beaglebone:~# cyclictest -p 80 -n -m >> # /dev/cpu_dma_latency set to 0us >> policy: fifo: loadavg: 0.62 0.19 0.07 1/65 361 >> >> [ 46.747855] Unable to handle kernel NULL pointer dereference at virtual address 00000000 >> [ 46.747863] pgd = db048000 >> [ 46.747869] [00000000] *pgd=9b0a0831, *pte=00000000, *ppte=00000000 >> [ 46.747901] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM >> [ 46.747911] Modules linked in: >> [ 46.747927] CPU: 0 PID: 361 Comm: cyclictest Not tainted 4.14.1-rt3 #9 >> [ 46.747930] Hardware name: Generic AM33XX (Flattened Device Tree) >> [ 46.747935] task: db225d00 task.stack: db164000 >> [ 46.747944] PC is at 0x0 >> [ 46.747960] LR is at smp_cross_call+0x40/0x160 > … >> [ 46.748234] [<c010f15c>] (smp_cross_call) from [<c010f990>] (arch_send_call_function_single_ipi+0x38/0x40) >> [ 46.748253] [<c010f990>] (arch_send_call_function_single_ipi) from [<c024c1b8>] (irq_work_queue_on+0xa4/0x114) >> [ 46.748277] [<c024c1b8>] (irq_work_queue_on) from [<c0183550>] (pull_rt_task+0x334/0x354) >> [ 46.748290] [<c0183550>] (pull_rt_task) from [<c01849dc>] (pick_next_task_rt+0x58/0x2bc) >> [ 46.748311] [<c01849dc>] (pick_next_task_rt) from [<c0880ff0>] (__schedule+0x5b0/0x91c) >> [ 46.748322] [<c0880ff0>] (__schedule) from [<c08813b8>] (schedule+0x5c/0xfc) >> [ 46.748334] [<c08813b8>] (schedule) from [<c0884864>] (do_nanosleep+0xf4/0x20c) >> [ 46.748350] [<c0884864>] (do_nanosleep) from [<c01cd350>] (__hrtimer_nanosleep+0x108/0x184) >> [ 46.748361] [<c01cd350>] (__hrtimer_nanosleep) from [<c01cd478>] (hrtimer_nanosleep+0x1c/0x20) >> [ 46.748372] [<c01cd478>] (hrtimer_nanosleep) from [<c01d6c6c>] (common_nsleep+0x2c/0x30) >> [ 46.748383] [<c01d6c6c>] (common_nsleep) from [<c01d87bc>] (SyS_clock_nanosleep+0xc4/0x110) >> [ 46.748400] [<c01d87bc>] (SyS_clock_nanosleep) from [<c01083a0>] (ret_fast_syscall+0x0/0x28) >> [ 46.748410] Code: bad PC value > > ach. The other part of the email. Would you mind trying v4.15-rc1? This > should blow up the same way. Sorry about the missing part. I only copied the stack trace into the other mail. Anyway, I am running v4.15-rc1 with CONFIG_PREEMPT and it didn't crash so far. On v4.14.1-rt3 the crash happens immediately after starting cyclictest. Thanks, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
