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Fri, 06 Feb 2026 06:28:10 -0800 (PST) Message-ID: Date: Fri, 6 Feb 2026 07:28:09 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [bug report] io_uring: add task fork hook To: Dan Carpenter Cc: Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel References: Content-Language: en-US From: Jens Axboe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 514DF20011 X-Stat-Signature: sj5kwpmije8arjghnosrfurcebmo1sti X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1770388092-946681 X-HE-Meta: U2FsdGVkX1+Oo0x3RyVE+Ig/iLBqJIsndETZEfUN3yE7ghC5xVf+Ngi8ctKXLnNk2CeVMtZpMkfLG783nrSHWpN3HvbqZUUjV0g1THHUUKDOgJN011bOFGhdNp9AyrryID1Y2//ftJfDkuzGWCrW7W24L60EiVqrKxKobOwKtIaQD30lqJKEzuoG2NGHOvCbFnYD2ogRzIW5VY5/79NeDAKpK2J1hRCTjeUvWoor09vnR1EECv4GlBTk/o3JnMEIkCsbtl5MeRxo2k0MxRhjQTSJiSiu38R7iuskHliPJAZ9VsuZu34ydjqWRr2b2Z2KTKhbg7MZJY7TAeC8Q+VGiiFTugqfLWtpupLGmA/llt/8INRR2MGIi/v91yDMfQbM/bBtqr51vG1c2pXTrYB+fmuUo+aaHe0RRVGQDDu4Z9dbu9L1BDweHMsxzodEx3A0uqDWTZR9KH/hy/x049CZTDbAsMZEWnhTn5SdZoZ1nNZDkEBMRLXEa9DPgdqsiFZTknVDy+e8lFr1DngHJw+AY4eiu6MC7d+ixk8/mG/6BUQUENe0ALJkCk4r9d/YlfGgJim88bq/Pw+vTSbqJqTW6U8N3LNe9wdZBnA7o3Ys+0IkCTOfdXBU4es1ige7lRZ5tR0dg30T//5Uoy1noU47z79vUelcy5q/JCF9KbKwnt/Zk20eTTKGbgv6YDxo0ANJXWF8YelR7qk/89SLpUCb+nQLFMDDA6BAfvJe7fUtJHFO2wlozbuNPYVlJVoE6x5NCBaUoqZyLAs1WROJWpJApdjpiybKmmR2qaznhNyC+J6ccNEwUx6ImW/y/XTAxxPYhSUBbfitRX6mHhva7SMkuGx7XDz3Kh8nhwOCjr2rvRezxePgFBka+0qYTcW2DBJx/+CpQ1uat9hZY6O9YMorm0b/EmKutIKsioU//TxYEIMWA2knELBelb5vXFZL2E8ckFq1Gs7/QnK57WACCKP 6zT4IE7Y 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, 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 2/6/26 6:40 AM, Dan Carpenter wrote: > [ Smatch checking is paused while we raise funding. #SadFace > https://lore.kernel.org/all/aTaiGSbWZ9DJaGo7@stanley.mountain/ -dan ] > > Hello Jens Axboe, > > Commit 4f08520591a2 ("io_uring: add task fork hook") from Jan 16, > 2026 (linux-next), leads to the following Smatch static checker > warning: > > kernel/fork.c:2544 copy_process() > warn: passing zero to 'ERR_PTR' > > kernel/fork.c > 2128 #ifdef CONFIG_IO_URING > 2129 p->io_uring = NULL; > 2130 retval = io_uring_fork(p); > > The patch added this assignment. > > 2131 if (unlikely(retval)) > 2132 goto bad_fork_cleanup_delayacct; > 2133 #endif > 2134 > 2135 p->default_timer_slack_ns = current->timer_slack_ns; > 2136 > 2137 #ifdef CONFIG_PSI > 2138 p->psi_flags = 0; > 2139 #endif > 2140 > 2141 task_io_accounting_init(&p->ioac); > 2142 acct_clear_integrals(p); > 2143 > 2144 posix_cputimers_init(&p->posix_cputimers); > 2145 tick_dep_init_task(p); > 2146 > 2147 p->io_context = NULL; > 2148 audit_set_context(p, NULL); > 2149 cgroup_fork(p); > 2150 if (args->kthread) { > 2151 if (!set_kthread_struct(p)) > 2152 goto bad_fork_cleanup_delayacct; > > So now retval is success where previously it had been -EAGAIN > > 2153 } Thanks, fixed up. -- Jens Axboe