Re: [vbabka:slab-kfree_rcu-destroy-v1r0] [mm, slab] df00e211c9: WARNING:at_mm/slab_common.c:#kmem_cache_kfree_rcu_destroy_workfn

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On 7/26/24 11:34, Vlastimil Babka wrote:
> On 7/25/24 7:59 AM, kernel test robot wrote:
>> 
>> hi, Vlastimil Babka,
>> 
>> we noticed by this commit:
>> 
>> 7fd4dfd0d38db6f3 df00e211c9c11e8d20f2ea7b4ab
>> ---------------- ---------------------------
>>        fail:runs  %reproduction    fail:runs
>>            |             |             |
>>           6:6         -100%            :6     dmesg.WARNING:at_mm/slab_common.c:#kmem_cache_destroy
>>            :6          100%           6:6     dmesg.WARNING:at_mm/slab_common.c:#kmem_cache_kfree_rcu_destroy_workfn
>> 
>> below formal report just FYI what we observed in our tests. not sure if it's
>> valuable to supply any hints.
>> 
>> 
>> Hello,
>> 
>> kernel test robot noticed "WARNING:at_mm/slab_common.c:#kmem_cache_kfree_rcu_destroy_workfn" on:
>> 
>> commit: df00e211c9c11e8d20f2ea7b4ab1d7c9760fe822 ("mm, slab: asynchronously destroy caches with outstanding objects")
>> https://git.kernel.org/cgit/linux/kernel/git/vbabka/linux.git slab-kfree_rcu-destroy-v1r0
> 
> Yes, that's expected proves we need the proper barrier added from the RCU
> folks :)

I've pushed a new branch

https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git
slab-kfree_rcu-destroy-v2r0

With the new barrier from Ulad so I'll be curious to hear if there are no
more of these warnings (or any issues). Thanks!

> Thanks,
> Vlastimil
> 
>> in testcase: rcutorture
>> version: 
>> with following parameters:
>> 
>> 	runtime: 300s
>> 	test: default
>> 	torture_type: tasks-tracing
>> 
>> 
>> 
>> compiler: clang-18
>> test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>> 
>> (please refer to attached dmesg/kmsg for entire log/backtrace)
>> 
>> 
>> 
>> If you fix the issue in a separate patch/commit (i.e. not just a new version of
>> the same patch/commit), kindly add following tags
>> | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
>> | Closes: https://lore.kernel.org/oe-lkp/202407251313.32e55498-oliver.sang@xxxxxxxxx
>> 
>> 
>> [  339.985807][   T98] ------------[ cut here ]------------
>> [  339.986460][   T98] kmem_cache_destroy rcuscale: Slab cache still has objects
>> [ 339.986476][ T98] WARNING: CPU: 1 PID: 98 at mm/slab_common.c:562 kmem_cache_kfree_rcu_destroy_workfn (mm/slab_common.c:561) 
>> [  339.988490][   T98] Modules linked in: rcutorture(-) torture crc32c_intel serio_raw stm_p_basic
>> [  339.989490][   T98] CPU: 1 PID: 98 Comm: kworker/1:3 Not tainted 6.10.0-rc6-00022-gdf00e211c9c1 #1
>> [  339.990127][   T98] Workqueue: events kmem_cache_kfree_rcu_destroy_workfn
>> [ 339.990888][ T98] EIP: kmem_cache_kfree_rcu_destroy_workfn (mm/slab_common.c:561) 
>> [ 339.991546][ T98] Code: 74 d3 e8 d8 f1 72 00 e8 63 31 e7 ff 83 c4 04 5e 5f 5b 5d 31 c0 31 c9 31 d2 c3 ff 76 f4 68 05 a9 2a d3 e8 38 28 e7 ff 83 c4 08 <0f> 0b eb cf 90 3e 8d 74 26 00 55 89 e5 53 57 56 83 ec 0c 64 a1 30
>> All code
>> ========
>>    0:	74 d3                	je     0xffffffffffffffd5
>>    2:	e8 d8 f1 72 00       	call   0x72f1df
>>    7:	e8 63 31 e7 ff       	call   0xffffffffffe7316f
>>    c:	83 c4 04             	add    $0x4,%esp
>>    f:	5e                   	pop    %rsi
>>   10:	5f                   	pop    %rdi
>>   11:	5b                   	pop    %rbx
>>   12:	5d                   	pop    %rbp
>>   13:	31 c0                	xor    %eax,%eax
>>   15:	31 c9                	xor    %ecx,%ecx
>>   17:	31 d2                	xor    %edx,%edx
>>   19:	c3                   	ret
>>   1a:	ff 76 f4             	push   -0xc(%rsi)
>>   1d:	68 05 a9 2a d3       	push   $0xffffffffd32aa905
>>   22:	e8 38 28 e7 ff       	call   0xffffffffffe7285f
>>   27:	83 c4 08             	add    $0x8,%esp
>>   2a:*	0f 0b                	ud2		<-- trapping instruction
>>   2c:	eb cf                	jmp    0xfffffffffffffffd
>>   2e:	90                   	nop
>>   2f:	3e 8d 74 26 00       	ds lea 0x0(%rsi,%riz,1),%esi
>>   34:	55                   	push   %rbp
>>   35:	89 e5                	mov    %esp,%ebp
>>   37:	53                   	push   %rbx
>>   38:	57                   	push   %rdi
>>   39:	56                   	push   %rsi
>>   3a:	83 ec 0c             	sub    $0xc,%esp
>>   3d:	64                   	fs
>>   3e:	a1                   	.byte 0xa1
>>   3f:	30                   	.byte 0x30
>> 
>> Code starting with the faulting instruction
>> ===========================================
>>    0:	0f 0b                	ud2
>>    2:	eb cf                	jmp    0xffffffffffffffd3
>>    4:	90                   	nop
>>    5:	3e 8d 74 26 00       	ds lea 0x0(%rsi,%riz,1),%esi
>>    a:	55                   	push   %rbp
>>    b:	89 e5                	mov    %esp,%ebp
>>    d:	53                   	push   %rbx
>>    e:	57                   	push   %rdi
>>    f:	56                   	push   %rsi
>>   10:	83 ec 0c             	sub    $0xc,%esp
>>   13:	64                   	fs
>>   14:	a1                   	.byte 0xa1
>>   15:	30                   	.byte 0x30
>> [  339.993706][   T98] EAX: 00000000 EBX: ed3f3000 ECX: 00000000 EDX: 00000000
>> [  339.994569][   T98] ESI: ed3f3048 EDI: 00010000 EBP: eda63f00 ESP: eda63ef0
>> [  339.994972][   T98] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010296
>> [  339.995835][   T98] CR0: 80050033 CR2: b7296028 CR3: 2e17c000 CR4: 000406d0
>> [  339.996669][   T98] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
>> [  339.997563][   T98] DR6: fffe0ff0 DR7: 00000400
>> [  339.998168][   T98] Call Trace:
>> [ 339.998550][ T98] ? show_regs (arch/x86/kernel/dumpstack.c:478) 
>> [ 339.999044][ T98] ? kmem_cache_kfree_rcu_destroy_workfn (mm/slab_common.c:561) 
>> [ 339.999854][ T98] ? __warn (kernel/panic.c:239 kernel/panic.c:693) 
>> [ 340.000309][ T98] ? kmem_cache_kfree_rcu_destroy_workfn (mm/slab_common.c:561) 
>> [ 340.001084][ T98] ? kmem_cache_kfree_rcu_destroy_workfn (mm/slab_common.c:561) 
>> [ 340.001837][ T98] ? report_bug (lib/bug.c:199) 
>> [ 340.002138][ T98] ? exc_overflow (arch/x86/kernel/traps.c:252) 
>> [ 340.002374][ T98] ? handle_bug (arch/x86/kernel/traps.c:?) 
>> [ 340.002602][ T98] ? exc_invalid_op (arch/x86/kernel/traps.c:260) 
>> [ 340.003063][ T98] ? handle_exception (arch/x86/entry/entry_32.S:1054) 
>> [ 340.003641][ T98] ? exc_overflow (arch/x86/kernel/traps.c:252) 
>> [ 340.004094][ T98] ? kmem_cache_kfree_rcu_destroy_workfn (mm/slab_common.c:561) 
>> [ 340.004932][ T98] ? exc_overflow (arch/x86/kernel/traps.c:252) 
>> [ 340.005201][ T98] ? kmem_cache_kfree_rcu_destroy_workfn (mm/slab_common.c:561) 
>> [ 340.005814][ T98] process_one_work (kernel/workqueue.c:3253) 
>> [ 340.006385][ T98] worker_thread (kernel/workqueue.c:3323 kernel/workqueue.c:3409) 
>> [ 340.006870][ T98] kthread (kernel/kthread.c:391) 
>> [ 340.007165][ T98] ? pr_cont_work (kernel/workqueue.c:3356) 
>> [ 340.007508][ T98] ? kthread_unuse_mm (kernel/kthread.c:342) 
>> [ 340.007852][ T98] ? kthread_unuse_mm (kernel/kthread.c:342) 
>> [ 340.008205][ T98] ret_from_fork (arch/x86/kernel/process.c:153) 
>> [ 340.008546][ T98] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) 
>> [ 340.008966][ T98] entry_INT80_32 (arch/x86/entry/entry_32.S:944) 
>> [  340.009348][   T98] irq event stamp: 13099
>> [ 340.009686][ T98] hardirqs last enabled at (13107): console_unlock (arch/x86/include/asm/irqflags.h:19 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 kernel/printk/printk.c:341 kernel/printk/printk.c:2731 kernel/printk/printk.c:3050) 
>> [ 340.015799][ T98] hardirqs last disabled at (13122): console_unlock (kernel/printk/printk.c:339) 
>> [ 340.016806][ T98] softirqs last enabled at (13120): __do_softirq (kernel/softirq.c:589) 
>> [ 340.017976][ T98] softirqs last disabled at (13115): __do_softirq (kernel/softirq.c:589) 
>> [  340.019062][   T98] ---[ end trace 0000000000000000 ]---
>> 
>> 
>> 
>> The kernel config and materials to reproduce are available at:
>> https://download.01.org/0day-ci/archive/20240725/202407251313.32e55498-oliver.sang@xxxxxxxxx
>> 
>> 
>> 
> 





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