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Wed, 2 Oct 2024 10:26:32 +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 YD4ANtgf/WZ4YQAAD6G6ig (envelope-from ); Wed, 02 Oct 2024 10:26:32 +0000 Message-ID: <80d0cd70-c00a-475c-a028-e842fb86403b@suse.cz> Date: Wed, 2 Oct 2024 12:26:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH slab hotfixes v2 2/2] slub/kunit: skip test_kfree_rcu when the slub kunit test is built-in Content-Language: en-US To: Guenter Roeck , Christoph Lameter , David Rientjes Cc: Roman Gushchin , Andrew Morton , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Paul E. McKenney" , Boqun Feng , Uladzislau Rezki , rcu@vger.kernel.org, David Gow , Rae Moar , linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, Brendan Higgins References: <20241001-b4-slub-kunit-fix-v2-0-2d995d3ecb49@suse.cz> <20241001-b4-slub-kunit-fix-v2-2-2d995d3ecb49@suse.cz> From: Vlastimil Babka 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: <20241001-b4-slub-kunit-fix-v2-2-2d995d3ecb49@suse.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Stat-Signature: 6pf9k75pir3g97cycgzif681thmabby1 X-Rspamd-Queue-Id: 301CAC000D X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1727864794-455041 X-HE-Meta: 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 vfBK8+3p 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 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 10/1/24 18:20, Vlastimil Babka wrote: > Guenter Roeck reports that the new slub kunit tests added by commit > 4e1c44b3db79 ("kunit, slub: add test_kfree_rcu() and > test_leak_destroy()") cause a lockup on boot on several architectures > when the kunit tests are configured to be built-in and not modules. > > The test_kfree_rcu test invokes kfree_rcu() and boot sequence inspection > showed the runner for built-in kunit tests kunit_run_all_tests() is > called before setting system_state to SYSTEM_RUNNING and calling > rcu_end_inkernel_boot(), so this seems like a likely cause. So while I > was unable to reproduce the problem myself, skipping the test when the > slub_kunit module is built-in should avoid the issue. > > An alternative fix that was moving the call to kunit_run_all_tests() a > bit later in the boot was tried, but has broken tests with functions > marked as __init due to free_initmem() already being done. > > Fixes: 4e1c44b3db79 ("kunit, slub: add test_kfree_rcu() and test_leak_destroy()") > Reported-by: Guenter Roeck > Closes: https://lore.kernel.org/all/6fcb1252-7990-4f0d-8027-5e83f0fb9409@roeck-us.net/ I hope you can confirm it helps, because the commit added two tests and I've only skipped one of them, as it's the one using kfree_rcu(), which is suspected. But the other is responsible for the (now suppressed) kmem_cache_destroy() warning, and maybe I'm missing something and it was actually that one causing the lockups. Since you mentioned the boot lockups happened on some x86_64 too, do you have a .config of the lockup case? I've tried tweaking some rcu options but still nothing. Thanks! > Cc: "Paul E. McKenney" > Cc: Boqun Feng > Cc: Uladzislau Rezki > Cc: rcu@vger.kernel.org > Cc: Brendan Higgins > Cc: David Gow > Cc: Rae Moar > Cc: linux-kselftest@vger.kernel.org > Cc: kunit-dev@googlegroups.com > Signed-off-by: Vlastimil Babka > --- > lib/slub_kunit.c | 14 ++++++++++---- > 1 file changed, 10 insertions(+), 4 deletions(-) > > diff --git a/lib/slub_kunit.c b/lib/slub_kunit.c > index 85d51ec09846d4fa219db6bda336c6f0b89e98e4..80e39f003344858722a544ad62ed84e885574054 100644 > --- a/lib/slub_kunit.c > +++ b/lib/slub_kunit.c > @@ -164,10 +164,16 @@ struct test_kfree_rcu_struct { > > static void test_kfree_rcu(struct kunit *test) > { > - struct kmem_cache *s = test_kmem_cache_create("TestSlub_kfree_rcu", > - sizeof(struct test_kfree_rcu_struct), > - SLAB_NO_MERGE); > - struct test_kfree_rcu_struct *p = kmem_cache_alloc(s, GFP_KERNEL); > + struct kmem_cache *s; > + struct test_kfree_rcu_struct *p; > + > + if (IS_BUILTIN(CONFIG_SLUB_KUNIT_TEST)) > + kunit_skip(test, "can't do kfree_rcu() when test is built-in"); > + > + s = test_kmem_cache_create("TestSlub_kfree_rcu", > + sizeof(struct test_kfree_rcu_struct), > + SLAB_NO_MERGE); > + p = kmem_cache_alloc(s, GFP_KERNEL); > > kfree_rcu(p, rcu); > kmem_cache_destroy(s); >