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
>>
>>
>>
>
