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Thu, 1 Aug 2024 14:30:36 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id T/OfFwycq2bWAwAAD6G6ig (envelope-from ); Thu, 01 Aug 2024 14:30:36 +0000 Message-ID: <7895689e-9854-4cda-b132-4e8c45f8017a@suse.cz> Date: Thu, 1 Aug 2024 16:30:36 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [vbabka:slab-kfree_rcu-destroy-v1r0] [mm, slab] df00e211c9: WARNING:at_mm/slab_common.c:#kmem_cache_kfree_rcu_destroy_workfn Content-Language: en-US From: Vlastimil Babka To: kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-mm@kvack.org, RCU References: <202407251313.32e55498-oliver.sang@intel.com> <4b31f1be-fbc5-404b-8a4e-1eb2ad4111e3@suse.cz> Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJkBREIBQkRadznAAoJECJPp+fMgqZkNxIQ ALZRqwdUGzqL2aeSavbum/VF/+td+nZfuH0xeWiO2w8mG0+nPd5j9ujYeHcUP1edE7uQrjOC Gs9sm8+W1xYnbClMJTsXiAV88D2btFUdU1mCXURAL9wWZ8Jsmz5ZH2V6AUszvNezsS/VIT87 AmTtj31TLDGwdxaZTSYLwAOOOtyqafOEq+gJB30RxTRE3h3G1zpO7OM9K6ysLdAlwAGYWgJJ V4JqGsQ/lyEtxxFpUCjb5Pztp7cQxhlkil0oBYHkudiG8j1U3DG8iC6rnB4yJaLphKx57NuQ PIY0Bccg+r9gIQ4XeSK2PQhdXdy3UWBr913ZQ9AI2usid3s5vabo4iBvpJNFLgUmxFnr73SJ KsRh/2OBsg1XXF/wRQGBO9vRuJUAbnaIVcmGOUogdBVS9Sun/Sy4GNA++KtFZK95U7J417/J Hub2xV6Ehc7UGW6fIvIQmzJ3zaTEfuriU1P8ayfddrAgZb25JnOW7L1zdYL8rXiezOyYZ8Fm ZyXjzWdO0RpxcUEp6GsJr11Bc4F3aae9OZtwtLL/jxc7y6pUugB00PodgnQ6CMcfR/HjXlae h2VS3zl9+tQWHu6s1R58t5BuMS2FNA58wU/IazImc/ZQA+slDBfhRDGYlExjg19UXWe/gMcl De3P1kxYPgZdGE2eZpRLIbt+rYnqQKy8UxlszsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZAUSmwUJDK5EZgAKCRAiT6fnzIKmZOJGEACOKABgo9wJXsbWhGWYO7mD 8R8mUyJHqbvaz+yTLnvRwfe/VwafFfDMx5GYVYzMY9TWpA8psFTKTUIIQmx2scYsRBUwm5VI EurRWKqENcDRjyo+ol59j0FViYysjQQeobXBDDE31t5SBg++veI6tXfpco/UiKEsDswL1WAr tEAZaruo7254TyH+gydURl2wJuzo/aZ7Y7PpqaODbYv727Dvm5eX64HCyyAH0s6sOCyGF5/p eIhrOn24oBf67KtdAN3H9JoFNUVTYJc1VJU3R1JtVdgwEdr+NEciEfYl0O19VpLE/PZxP4wX PWnhf5WjdoNI1Xec+RcJ5p/pSel0jnvBX8L2cmniYnmI883NhtGZsEWj++wyKiS4NranDFlA HdDM3b4lUth1pTtABKQ1YuTvehj7EfoWD3bv9kuGZGPrAeFNiHPdOT7DaXKeHpW9homgtBxj 8aX/UkSvEGJKUEbFL9cVa5tzyialGkSiZJNkWgeHe+jEcfRT6pJZOJidSCdzvJpbdJmm+eED w9XOLH1IIWh7RURU7G1iOfEfmImFeC3cbbS73LQEFGe1urxvIH5K/7vX+FkNcr9ujwWuPE9b 1C2o4i/yZPLXIVy387EjA6GZMqvQUFuSTs/GeBcv0NjIQi8867H3uLjz+mQy63fAitsDwLmR EP+ylKVEKb0Q2A== In-Reply-To: <4b31f1be-fbc5-404b-8a4e-1eb2ad4111e3@suse.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Queue-Id: 8D2CE10002E X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 4otyc7scuxnixhy466mayufio3orpgz3 X-HE-Tag: 1722522639-56549 X-HE-Meta: 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 jdEgDI9f DZ0JYoZdOv9sO9aWNwXR6KQDjdi1FwXy8wtpVLvwQjnYqWeV92G4qxI4l6ENAEjKw5G2YjFE7qBaHviipCbDggJkNBJvhvI+Wnl2lKytWHmMEVtdfR1IQkq26n/X/32MwKgYL5+ly4uyfIT05I7jWFDafKi97xlKW1ORo7jnC9OHNRQpjMbApbfF77dRyqfuJpdG1gvLNWt3X7C7AUnyDauXKQb5ifcBC1T3QQjnmycpnbMwHkvIwKVqhvVBrO8hSCXeINNIee8nKLecE/wHkxsDAmHBrRPZ4Hugez1T2OqAt0TLk+U7dilgKh5dcVRaoyP2LkHFRgc3/PBmKk+nfkOdrb0CNvqX8vd4YJHGt0JzTYgKn1WrGJ20NU0YtOB+imYa6XalGlgvBtY/VTc2/KERcyNgIznGPmXQWDOY32CaBKZJujMYUOMcnmJ8sVOPTLDf9 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 >> | Closes: https://lore.kernel.org/oe-lkp/202407251313.32e55498-oliver.sang@intel.com >> >> >> [ 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@intel.com >> >> >> >