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([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71b2652bb5esm6776500b3a.175.2024.09.30.11.50.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Sep 2024 11:50:37 -0700 (PDT) Message-ID: <9dd56c26-12db-4b69-af0e-fdea33bb8208@roeck-us.net> Date: Mon, 30 Sep 2024 11:50:35 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH slab hotfixes 2/2] kunit: move call to kunit_run_all_tests() after rcu_end_inkernel_boot() To: Vlastimil Babka , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: "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: <20240930-b4-slub-kunit-fix-v1-0-32ca9dbbbc11@suse.cz> <20240930-b4-slub-kunit-fix-v1-2-32ca9dbbbc11@suse.cz> Content-Language: en-US From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; keydata= xsFNBE6H1WcBEACu6jIcw5kZ5dGeJ7E7B2uweQR/4FGxH10/H1O1+ApmcQ9i87XdZQiB9cpN RYHA7RCEK2dh6dDccykQk3bC90xXMPg+O3R+C/SkwcnUak1UZaeK/SwQbq/t0tkMzYDRxfJ7 nyFiKxUehbNF3r9qlJgPqONwX5vJy4/GvDHdddSCxV41P/ejsZ8PykxyJs98UWhF54tGRWFl 7i1xvaDB9lN5WTLRKSO7wICuLiSz5WZHXMkyF4d+/O5ll7yz/o/JxK5vO/sduYDIlFTvBZDh gzaEtNf5tQjsjG4io8E0Yq0ViobLkS2RTNZT8ICq/Jmvl0SpbHRvYwa2DhNsK0YjHFQBB0FX IdhdUEzNefcNcYvqigJpdICoP2e4yJSyflHFO4dr0OrdnGLe1Zi/8Xo/2+M1dSSEt196rXaC kwu2KgIgmkRBb3cp2vIBBIIowU8W3qC1+w+RdMUrZxKGWJ3juwcgveJlzMpMZNyM1jobSXZ0 VHGMNJ3MwXlrEFPXaYJgibcg6brM6wGfX/LBvc/haWw4yO24lT5eitm4UBdIy9pKkKmHHh7s jfZJkB5fWKVdoCv/omy6UyH6ykLOPFugl+hVL2Prf8xrXuZe1CMS7ID9Lc8FaL1ROIN/W8Vk BIsJMaWOhks//7d92Uf3EArDlDShwR2+D+AMon8NULuLBHiEUQARAQABzTJHdWVudGVyIFJv ZWNrIChMaW51eCBhY2NvdW50KSA8bGludXhAcm9lY2stdXMubmV0PsLBgQQTAQIAKwIbAwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4ACGQEFAlVcphcFCRmg06EACgkQyx8mb86fmYFg0RAA nzXJzuPkLJaOmSIzPAqqnutACchT/meCOgMEpS5oLf6xn5ySZkl23OxuhpMZTVX+49c9pvBx hpvl5bCWFu5qC1jC2eWRYU+aZZE4sxMaAGeWenQJsiG9lP8wkfCJP3ockNu0ZXXAXwIbY1O1 c+l11zQkZw89zNgWgKobKzrDMBFOYtAh0pAInZ9TSn7oA4Ctejouo5wUugmk8MrDtUVXmEA9 7f9fgKYSwl/H7dfKKsS1bDOpyJlqhEAH94BHJdK/b1tzwJCFAXFhMlmlbYEk8kWjcxQgDWMu GAthQzSuAyhqyZwFcOlMCNbAcTSQawSo3B9yM9mHJne5RrAbVz4TWLnEaX8gA5xK3uCNCeyI sqYuzA4OzcMwnnTASvzsGZoYHTFP3DQwf2nzxD6yBGCfwNGIYfS0i8YN8XcBgEcDFMWpOQhT Pu3HeztMnF3HXrc0t7e5rDW9zCh3k2PA6D2NV4fews9KDFhLlTfCVzf0PS1dRVVWM+4jVl6l HRIAgWp+2/f8dx5vPc4Ycp4IsZN0l1h9uT7qm1KTwz+sSl1zOqKD/BpfGNZfLRRxrXthvvY8 BltcuZ4+PGFTcRkMytUbMDFMF9Cjd2W9dXD35PEtvj8wnEyzIos8bbgtLrGTv/SYhmPpahJA l8hPhYvmAvpOmusUUyB30StsHIU2LLccUPPOwU0ETofVZwEQALlLbQeBDTDbwQYrj0gbx3bq 7kpKABxN2MqeuqGr02DpS9883d/t7ontxasXoEz2GTioevvRmllJlPQERVxM8gQoNg22twF7 pB/zsrIjxkE9heE4wYfN1AyzT+AxgYN6f8hVQ7Nrc9XgZZe+8IkuW/Nf64KzNJXnSH4u6nJM J2+Dt274YoFcXR1nG76Q259mKwzbCukKbd6piL+VsT/qBrLhZe9Ivbjq5WMdkQKnP7gYKCAi pNVJC4enWfivZsYupMd9qn7Uv/oCZDYoBTdMSBUblaLMwlcjnPpOYK5rfHvC4opxl+P/Vzyz 6WC2TLkPtKvYvXmdsI6rnEI4Uucg0Au/Ulg7aqqKhzGPIbVaL+U0Wk82nz6hz+WP2ggTrY1w ZlPlRt8WM9w6WfLf2j+PuGklj37m+KvaOEfLsF1v464dSpy1tQVHhhp8LFTxh/6RWkRIR2uF I4v3Xu/k5D0LhaZHpQ4C+xKsQxpTGuYh2tnRaRL14YMW1dlI3HfeB2gj7Yc8XdHh9vkpPyuT nY/ZsFbnvBtiw7GchKKri2gDhRb2QNNDyBnQn5mRFw7CyuFclAksOdV/sdpQnYlYcRQWOUGY HhQ5eqTRZjm9z+qQe/T0HQpmiPTqQcIaG/edgKVTUjITfA7AJMKLQHgp04Vylb+G6jocnQQX JqvvP09whbqrABEBAAHCwWUEGAECAA8CGwwFAlVcpi8FCRmg08MACgkQyx8mb86fmYHNRQ/+ J0OZsBYP4leJvQF8lx9zif+v4ZY/6C9tTcUv/KNAE5leyrD4IKbnV4PnbrVhjq861it/zRQW cFpWQszZyWRwNPWUUz7ejmm9lAwPbr8xWT4qMSA43VKQ7ZCeTQJ4TC8kjqtcbw41SjkjrcTG wF52zFO4bOWyovVAPncvV9eGA/vtnd3xEZXQiSt91kBSqK28yjxAqK/c3G6i7IX2rg6pzgqh hiH3/1qM2M/LSuqAv0Rwrt/k+pZXE+B4Ud42hwmMr0TfhNxG+X7YKvjKC+SjPjqp0CaztQ0H nsDLSLElVROxCd9m8CAUuHplgmR3seYCOrT4jriMFBtKNPtj2EE4DNV4s7k0Zy+6iRQ8G8ng QjsSqYJx8iAR8JRB7Gm2rQOMv8lSRdjva++GT0VLXtHULdlzg8VjDnFZ3lfz5PWEOeIMk7Rj trjv82EZtrhLuLjHRCaG50OOm0hwPSk1J64R8O3HjSLdertmw7eyAYOo4RuWJguYMg5DRnBk WkRwrSuCn7UG+qVWZeKEsFKFOkynOs3pVbcbq1pxbhk3TRWCGRU5JolI4ohy/7JV1TVbjiDI HP/aVnm6NC8of26P40Pg8EdAhajZnHHjA7FrJXsy3cyIGqvg9os4rNkUWmrCfLLsZDHD8FnU mDW4+i+XlNFUPUYMrIKi9joBhu18ssf5i5Q= In-Reply-To: <20240930-b4-slub-kunit-fix-v1-2-32ca9dbbbc11@suse.cz> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: dqh9jdxdz3ewperbu58scf3o7jcqkhx1 X-Rspamd-Queue-Id: 04C9920010 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1727722239-201271 X-HE-Meta: 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 GpZDK0tn NINpd1PcryzhGRXfdMuJQw9KS7B3at7IJLVB6NF9QflYshWWxZ9IrY31dSQUGdYv1fx3wPGdYGZC5lIARki+DkhLnBCJG0v2qSbHcW6C0K2trt72cHwWKuqNqxcBLXwY36uUnWx6mhmwIcdXHsiXagSFECxmTlmnqDXPYqg/jejv9peWgLwvBaQHlkmuEx23HGAuAxU4X7ekwb0zllEjh4S/P3GldsbwLawtMWenC6rAXp5Qn6pQISiiMtABwxlAUQekCzPst4NgUOdaMDJcxJKXQo2zgGArPmmB/KCmIgolzxRIX2tadafGNVLflXN3bCxcBZeE995y2/0EXy+tXD0laATvjCC6rbYldYYBeNJY/lb3ETLlhSBUTYDstj53qqVccVVQ93tdncvvzLnw+0HCjvsuim/13I+9TdHxzGN4xzwJs5SzB/nbClbNgk/Ddio7WaOndooxAapKbQ+3IQQYkcjoozdc4EBzbnmk1ex28kY++0fiw7jbz8jf52SmgpCl15lw/7De2nL0qtiPi0gsijeRXz8Lkqn4Xl56kmVZIvDl4bnI0MIkv6izQXei/EgUpiLaI/W7pBHMM3a0dl580H2+bHSOawc/d3aK1lIJ9z1rwM0kOWmTHxSwLM3YkTfNNirvZC+0VWHC7AajTqybyRoBhjPkX+42iBmbiYfD/ei+N29g7LNyyJ/SBJ9vPstO5qLFQZe5VwD5Bq6hfty+vS7g5r4hKO6YkRDvzqWhuE+UCmzZX04ShRg== 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 9/30/24 01:37, 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. > > These tests invoke kfree_rcu() and kvfree_rcu_barrier() 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, > moving the call to kunit_run_all_tests() a bit later in the boot seems > to have fixed the lockup problem according to Guenter's limited testing. > > No kunit tests should be broken by calling the built-in executor a bit > later, as when compiled as modules, they are still executed even later > than this. > > 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/ > 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 > --- > init/main.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/init/main.c b/init/main.c > index c4778edae7972f512d5eefe8400075ac35a70d1c..7890ebb00e84b8bd7bac28923fb1fe571b3e9ee2 100644 > --- a/init/main.c > +++ b/init/main.c > @@ -1489,6 +1489,8 @@ static int __ref kernel_init(void *unused) > > rcu_end_inkernel_boot(); > > + kunit_run_all_tests(); > + > do_sysctl_args(); > > if (ramdisk_execute_command) { > @@ -1579,8 +1581,6 @@ static noinline void __init kernel_init_freeable(void) > > do_basic_setup(); > > - kunit_run_all_tests(); > - > wait_for_initramfs(); > console_on_rootfs(); > > Unfortunately it doesn't work. With this patch applied, I get many backtraces similar to the following, and ultimately the image crashes. This is with arm64. I do not see the problem if I drop this patch. Guenter --- [ 9.465871] KTAP version 1 [ 9.465964] # Subtest: iov_iter [ 9.466056] # module: kunit_iov_iter [ 9.466115] 1..12 [ 9.467000] Unable to handle kernel paging request at virtual address ffffc37db5c9f26c [ 9.467244] Mem abort info: [ 9.467332] ESR = 0x0000000086000007 [ 9.467454] EC = 0x21: IABT (current EL), IL = 32 bits [ 9.467576] SET = 0, FnV = 0 [ 9.467667] EA = 0, S1PTW = 0 [ 9.467762] FSC = 0x07: level 3 translation fault [ 9.467912] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000042a59000 [ 9.468055] [ffffc37db5c9f26c] pgd=0000000000000000, p4d=1000000044b36003, pud=1000000044b37003, pmd=1000000044b3a003, pte=0000000000000000 [ 9.469430] Internal error: Oops: 0000000086000007 [#1] PREEMPT SMP [ 9.469687] Modules linked in: [ 9.470035] CPU: 0 UID: 0 PID: 550 Comm: kunit_try_catch Tainted: G N 6.12.0-rc1-00005-ga65e3eb58cdb #1 [ 9.470290] Tainted: [N]=TEST [ 9.470356] Hardware name: linux,dummy-virt (DT) [ 9.470530] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 9.470656] pc : iov_kunit_copy_to_kvec+0x0/0x334 [ 9.471055] lr : kunit_try_run_case+0x6c/0x15c [ 9.471145] sp : ffff800080883de0 [ 9.471210] x29: ffff800080883e20 x28: 0000000000000000 x27: 0000000000000000 [ 9.471376] x26: 0000000000000000 x25: 0000000000000000 x24: ffff80008000bb68 [ 9.471501] x23: ffffc37db3f7093c x22: ffff80008000b940 x21: ffff545847af4c00 [ 9.471622] x20: ffff545847cd3940 x19: ffff80008000bb50 x18: 0000000000000006 [ 9.471742] x17: 6c61746f7420303a x16: 70696b7320303a6c x15: 0000000000000172 [ 9.471863] x14: 0000000000020000 x13: 0000000000000000 x12: ffffc37db6a600c8 [ 9.471983] x11: 0000000000000043 x10: 0000000000000043 x9 : 1fffffffffffffff [ 9.472122] x8 : 00000000ffffffff x7 : 000000001040d4fd x6 : ffffc37db70c3810 [ 9.472243] x5 : 0000000000000000 x4 : ffffffffc4653600 x3 : 000000003b9ac9ff [ 9.472363] x2 : 0000000000000001 x1 : ffffc37db5c9f26c x0 : ffff80008000bb50 [ 9.472572] Call trace: [ 9.472636] iov_kunit_copy_to_kvec+0x0/0x334 [ 9.472740] kunit_generic_run_threadfn_adapter+0x28/0x4c [ 9.472835] kthread+0x11c/0x120 [ 9.472903] ret_from_fork+0x10/0x20 [ 9.473146] Code: ???????? ???????? ???????? ???????? (????????) [ 9.473505] ---[ end trace 0000000000000000 ]---