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Date:   Thu, 30 Aug 2018 12:44:44 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH tip/core/rcu 3/3] srcu: Make early-boot call_srcu()
 reuse workqueue lists

On Wed, 29 Aug 2018 20:23:15 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> > > Glad you like it!  Does it actually work for you?  ;-)  
> > 
> > Oh, you want me to actually test it too? ;-)  
> 
> ;-) ;-) ;-)
> 
> > I'll try to add that in my todo list tomorrow.  
> 
> Much appreciated!

I reverted the change that prevents calling call_srcu() early:

I checked out v4.19-rc1 and applied these three patches, then did:

git show f8a79d5c7ef47c62d97a30e16064caf2ef91f648 | patch -p1 -R

But still triggered the following:

 WARNING: CPU: 0 PID: 0 at /work/git/linux-trace.git/kernel/rcu/srcutree.c:242 check_init_srcu_struct+0x85/0x90
 Modules linked in:
 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.0-rc1-test+ #1194
 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016
 RIP: 0010:check_init_srcu_struct+0x85/0x90
 Code: 16 25 00 f6 83 70 06 00 00 03 74 0d be 01 00 00 00 48 89 df e8 6c f6 ff ff 5b 4c 89 ee 4c 89 e7 5d 41 5c 41 5d e9 db 4a d7 00 <0f> 0b eb 9a 0f 1f 80 00 00 00 00 0f 1f 44 00 00 41 57 48 8d 87 90
 RSP: 0000:ffff8800d3c07d90 EFLAGS: 00010246
 RAX: 0000000000000000 RBX: ffffffffb9d4d960 RCX: ffffffffb81dab0a
 RDX: 0000000000000007 RSI: dffffc0000000000 RDI: ffffffffba1cd854
 RBP: ffffffffb827de70 R08: fffffbfff76a9525 R09: fffffbfff76a9524
 R10: ffff8800d3c07db0 R11: fffffbfff76a9525 R12: ffff8800cfacba88
 R13: ffffffffb9d4d960 R14: 000000000000000a R15: ffff8800d3c07eb0
 FS:  0000000000000000(0000) GS:ffff8800d3c00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: ffff88011e7ff000 CR3: 00000000a2c14001 CR4: 00000000001606f0
 Call Trace:
  <IRQ>
  ? rcu_free_old_probes+0x20/0x20
  ? for_each_kernel_tracepoint+0x50/0x50
  __call_srcu+0x29/0x570
  ? rcu_process_callbacks+0x403/0xcd0
  ? for_each_kernel_tracepoint+0x50/0x50
  rcu_process_callbacks+0x44f/0xcd0
  ? __bpf_trace_timer_class+0x10/0x10
  ? sched_clock+0x5/0x10
  ? note_gp_changes+0xf0/0xf0
  ? __lock_is_held+0x26/0xf0
  __do_softirq+0x13b/0x561
  irq_exit+0x12c/0x140
  smp_apic_timer_interrupt+0xd4/0x2f0
  apic_timer_interrupt+0xf/0x20
  </IRQ>
 RIP: 0010:mwait_idle+0x83/0x260
 Code: 48 89 d1 48 89 d8 0f 01 c8 48 89 df e8 f6 d5 4d ff 48 8b 03 a8 08 0f 85 c0 01 00 00 e8 f6 dc 35 ff 31 c0 48 89 c1 fb 0f 01 c9 <e8> 68 ee 85 ff 41 89 c4 0f 1f 44 00 00 65 48 8b 04 25 c0 ed 01 00
 RSP: 0000:ffffffffb9c07d28 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
 RAX: 0000000000000000 RBX: ffffffffb9c1f9c0 RCX: 0000000000000000
 RDX: 0000000000000007 RSI: dffffc0000000000 RDI: ffffffffb9c2028c
 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
 R13: ffffffffba1cd740 R14: 0000000000000000 R15: 0000000000000000
  ? mwait_idle+0x7a/0x260
  default_idle_call+0x2d/0x50
  do_idle+0x251/0x310
  ? arch_cpu_idle_exit+0x40/0x40
  cpu_startup_entry+0xc2/0xd0
  ? cpu_in_idle+0x20/0x20
  ? preempt_count_sub+0xaa/0x100
  start_kernel+0x640/0x67d
  ? thread_stack_cache_init+0x6/0x6
  ? load_ucode_intel_bsp+0x5f/0xa5
  ? load_ucode_intel_bsp+0x5f/0xa5
  ? init_intel_microcode+0xb0/0xb0
  ? load_ucode_bsp+0xbb/0x156
  secondary_startup_64+0xa4/0xb0
 irq event stamp: 21271
 hardirqs last  enabled at (21270): [<ffffffffb81e1e52>] rcu_process_callbacks+0x982/0xcd0
 hardirqs last disabled at (21271): [<ffffffffb800447f>] trace_hardirqs_off_thunk+0x1a/0x1c
 softirqs last  enabled at (21252): [<ffffffffb811529c>] irq_enter+0x7c/0x80
 softirqs last disabled at (21253): [<ffffffffb81153cc>] irq_exit+0x12c/0x140
 ---[ end trace 64bab84b86e8ec96 ]---

Attached is my config, and my kernel command line has:

 trace_event=sched_switch

-- Steve

Download attachment "config" of type "application/octet-stream" (134795 bytes)

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