__queue_work oops.

From: Dave Jones <davej@codemonkey.org.uk>
To: Linux Kernel <linux-kernel@vger.kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Subject: __queue_work oops.
Date: Mon, 27 Feb 2017 12:14:39 -0500	[thread overview]
Message-ID: <20170227171439.jshx3qplflyrgcv7@codemonkey.org.uk> (raw)

Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.10.0-think+ #9 
task: ffff88017f105440 task.stack: ffffc90000094000
RIP: 0010:__queue_work+0x2d/0x700
RSP: 0018:ffff880507c03df8 EFLAGS: 00010046
RAX: 0000000000000082 RBX: 0000000000000101 RCX: 0000000000000002
RDX: ffff88047bf07c98 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff880507c03e30 R08: 0000000000000001 R09: ffffffff8294bf68
R10: ffff880507c03e58 R11: 0000000000000000 R12: ffff88047bf07ce8
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88047bf07c98
FS:  0000000000000000(0000) GS:ffff880507c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000001c2 CR3: 0000000004e11000 CR4: 00000000001406e0
Call Trace:
 <IRQ>
 ? work_on_cpu+0xb0/0xb0
 delayed_work_timer_fn+0x1e/0x20
 call_timer_fn+0xbd/0x480
 ? call_timer_fn+0x5/0x480
 ? work_on_cpu+0xb0/0xb0
 run_timer_softirq+0x1a1/0x700
 __do_softirq+0xbf/0x5b1
 irq_exit+0xb5/0xc0
 smp_apic_timer_interrupt+0x3d/0x50
 apic_timer_interrupt+0x97/0xa0
RIP: 0010:cpuidle_enter_state+0x12e/0x400
RSP: 0018:ffffc90000097e40 EFLAGS: 00000202
[CONT START]  ORIG_RAX: ffffffffffffff10
RAX: ffff88017f105440 RBX: ffffe8ffffa03dc8 RCX: 0000000000000001
RDX: 20c49ba5e353f7cf RSI: 0000000000000001 RDI: ffff88017f105440
RBP: ffffc90000097e80 R08: cccccccccccccccd R09: 0000000000000018
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000005
R13: ffffffff81eaf198 R14: 0000000000000005 R15: ffffffff81eaf180
 </IRQ>
 cpuidle_enter+0x17/0x20
 call_cpuidle+0x23/0x40
 do_idle+0xfb/0x200
 cpu_startup_entry+0x71/0x80
 start_secondary+0x16a/0x210
 start_cpu+0x14/0x14
Code: 44 00 00 55 48 89 e5 41 57 49 89 d7 41 56 41 89 fe 41 55 49 89 f5 41 54 53 48 83 ec 10 89 7d d4 9c 58 f6 c4 02 0f 85 06 04 00 00 <41> f6 85 c2 01 00 00 01 0f 85 22 04 00 00 49 bc eb 83 b5 80 46 

Code starting with the faulting instruction
===========================================
   0:	41 f6 85 c2 01 00 00 	testb  $0x1,0x1c2(%r13)
   7:	01 
   8:	0f 85 22 04 00 00    	jne    0x430
   e:	49                   	rex.WB
   f:	bc eb 83 b5 80       	mov    $0x80b583eb,%esp
  14:	46                   	rex.RX

0000000000003cf0 <__queue_work>:
{
    3cf0:       e8 00 00 00 00          callq  3cf5 <__queue_work+0x5>
    3cf5:       55                      push   %rbp
    3cf6:       48 89 e5                mov    %rsp,%rbp
    3cf9:       41 57                   push   %r15
    3cfb:       49 89 d7                mov    %rdx,%r15
    3cfe:       41 56                   push   %r14
        unsigned int req_cpu = cpu;
    3d00:       41 89 fe                mov    %edi,%r14d
{
    3d03:       41 55                   push   %r13
    3d05:       49 89 f5                mov    %rsi,%r13
    3d08:       41 54                   push   %r12
    3d0a:       53                      push   %rbx
    3d0b:       48 83 ec 10             sub    $0x10,%rsp
    3d0f:       89 7d d4                mov    %edi,-0x2c(%rbp)
        asm volatile("# __raw_save_flags\n\t"
    3d12:       9c                      pushfq 
    3d13:       58                      pop    %rax
        WARN_ON_ONCE(!irqs_disabled());
    3d14:       f6 c4 02                test   $0x2,%ah
    3d17:       0f 85 06 04 00 00       jne    4123 <__queue_work+0x433>
        if (unlikely(wq->flags & __WQ_DRAINING) &&
    3d1d:       41 f6 85 c2 01 00 00    testb  $0x1,0x1c2(%r13)

So we called __queue_work with a null wq.

Thoughts ?

	Dave