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SubjectRe: rcu_sched self-detected stall on CPU
Sorry!!

Alec Ari

On Thu, Sep 15, 2016 at 1:22 AM, Mike Galbraith
<umgwanakikbuti@gmail.com> wrote:
> On Wed, 2016-09-14 at 23:02 -0500, NTU wrote:
>> [ 26.542980] Call Trace:
>> [ 26.542983] [<ffffffffa7fbd7c1>] ? 0xffffffffa7fbd7c1
>> [ 26.542985] [<ffffffffa7f17d35>] ? 0xffffffffa7f17d35
>> [ 26.542986] [<ffffffffa796c115>] ? 0xffffffffa796c115
>> [ 26.542988] [<ffffffffa7633d86>] ? 0xffffffffa7633d86
>> [ 26.542989] [<ffffffffa796c0a6>] ? 0xffffffffa796c0a6
> ...
>
> The stack trace is useless without symbols.
[ 5.094204] debug: unmapping init [mem 0xffffffffb2717000-0xffffffffb284dfff]
[ 5.098544] Write protecting the kernel read-only data: 32768k
[ 5.103870] Testing CPA: undo ffffffffb0400000-ffffffffb2400000
[ 5.109293] Testing CPA: again
[ 5.114695] debug: unmapping init [mem 0xffff880262881000-0xffff8802629fffff]
[ 5.119041] debug: unmapping init [mem 0xffff880262f30000-0xffff880262ffffff]
[ 26.098243] INFO: rcu_sched self-detected stall on CPU
[ 26.102209] 0-...: (20984 ticks this GP) idle=e5d/140000000000001/0 softirq=196/196 fqs=5248
[ 26.106247] (t=21000 jiffies g=-219 c=-220 q=12)
[ 26.110323] Task dump for CPU 0:
[ 26.114397] swapper/0 R running task 0 1 0 0x00000008
[ 26.118502] ffffffffb2463020 0000000074ef7c0c ffff8803ace07c98 ffffffffb050d416
[ 26.122620] 0000000000000006 0000000000000010 0000000041b58ab3 ffffffffb22d8e95
[ 26.126749] ffffffffb050d1f0 ffff8803ace07d30 ffffffffb0d59b59 000000000000000f
[ 26.130922] Call Trace:
[ 26.135064] <IRQ> [<ffffffffb050d416>] sched_show_task+0x226/0x380
[ 26.139255] [<ffffffffb050d1f0>] ? SyS_sched_rr_get_interval+0x250/0x250
[ 26.143423] [<ffffffffb0d59b59>] ? _find_next_bit+0xe9/0x120
[ 26.147605] [<ffffffffb0514f41>] dump_cpu_task+0x71/0x90
[ 26.151766] [<ffffffffb1c60a15>] rcu_dump_cpu_stacks+0x180/0x1a6
[ 26.155944] [<ffffffffb0594576>] rcu_check_callbacks+0x1706/0x17f0
[ 26.160166] [<ffffffffb062662f>] ? __acct_update_integrals+0x21f/0x2a0
[ 26.164410] [<ffffffffb059e6c0>] update_process_times+0x30/0x60
[ 26.168622] [<ffffffffb05c8533>] tick_sched_timer+0xb3/0x420
[ 26.172808] [<ffffffffb05c8480>] ? tick_init_highres+0x20/0x20
[ 26.177013] [<ffffffffb059f52e>] __hrtimer_run_queues+0x25e/0x4e0
[ 26.181207] [<ffffffffb05a11dc>] hrtimer_interrupt+0x17c/0x450
[ 26.185436] [<ffffffffb1c7d8ef>] smp_trace_apic_timer_interrupt+0xdf/0x140
[ 26.189679] [<ffffffffb1c7d959>] smp_apic_timer_interrupt+0x9/0xb
[ 26.193895] [<ffffffffb1c7d19c>] apic_timer_interrupt+0x7c/0x90
[ 26.198079] <EOI> [<ffffffffb0493640>] ? ptdump_walk_pgd_level_core+0x4b0/0x710
[ 26.202346] [<ffffffffb0493190>] ? note_page+0x1790/0x1790
[ 26.206594] [<ffffffffb0485a64>] ? set_memory_np+0x34/0x40
[ 26.210890] [<ffffffffb04938e7>] ptdump_walk_pgd_level_checkwx+0x17/0x20
[ 26.215212] [<ffffffffb04788ef>] mark_rodata_ro+0x1cf/0x230
[ 26.219534] [<ffffffffb1c6b114>] kernel_init+0x34/0x180
[ 26.223866] [<ffffffffb1c7c00f>] ret_from_fork+0x1f/0x40
[ 26.228146] [<ffffffffb1c6b0e0>] ? rest_init+0xa0/0xa0
[ 32.053216] CPA self-test:
[ 32.258851] 4k 4187648 large 0 gb 0 x 1837[ffff880000099000-ffff880100000000] miss 268800
[ 32.467012] 4k 4187648 large 0 gb 0 x 1837[ffff880000099000-ffff880100000000] miss 268800
[ 32.673716] 4k 4187648 large 0 gb 0 x 1837[ffff880000099000-ffff880100000000] miss 268800
[ 32.678052] ok.
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