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Mon, 21 Sep 2026 10:29:14 -0400 X-MC-Unique: 5rPfoTMHPbmai33uCsAHrQ-1 X-Mimecast-MFC-AGG-ID: 5rPfoTMHPbmai33uCsAHrQ_1790000950 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 43C62185126D; Mon, 21 Sep 2026 14:29:10 +0000 (UTC) Received: from fedora (headnet03.pony-001.prod.iad2.dc.redhat.com [10.2.32.114]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 37FF61800446; Mon, 21 Sep 2026 14:29:06 +0000 (UTC) Received: by fedora (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Mon, 21 Sep 2026 16:29:09 +0200 (CEST) Date: Mon, 21 Sep 2026 16:29:05 +0200 From: Oleg Nesterov To: Christian Brauner Cc: Chris Mason , linux-fsdevel@vger.kernel.org, Jens Axboe , Alexander Viro , Jan Kara , NeilBrown , Ingo Molnar , Peter Zijlstra , linux-mm@kvack.org, io-uring@vger.kernel.org Subject: Re: [PATCH v3 15/17] fork: use SIG_KERNEL_ONLY_MASK for the user worker signal mask Message-ID: References: <20260921-work-coredump-fixes-v3-0-8e4adb1619e6@kernel.org> <20260921-work-coredump-fixes-v3-15-8e4adb1619e6@kernel.org> MIME-Version: 1.0 In-Reply-To: <20260921-work-coredump-fixes-v3-15-8e4adb1619e6@kernel.org> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Mimecast-MFC-PROC-ID: zNJzFkYZOp92AsxwktSv315fYTREkXRro2e4rX70fWg_1790000950 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 8FE64180002 X-Stat-Signature: 9uxkktpz771guzuyqmos5zoph9dngq1m X-HE-Tag: 1790000963-407930 X-HE-Meta: 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 qPB+Q/4t odx4+PwVX5qNomku+h+cjzWk3W6tbzSVu2mokoxv7/6QmYaLbLELfxYJWlagsKQoqIdLWAMrfeYW8FoTq+nrWu30q0MjdRYcebvHlzcl6eMgOTniWIAuBcYtRY6WpqSxW/K7+VjhqsVkM1IRNduVmyfvnReX1trq0j4c7HtgGm131XB9j18kwQ06I4mXd+dyhO3nZgOv3MHUceJFF9I9iLn+Qs/813iDOID8iGeAu/4dgR0WUrlifpQdqzUrxIvuUUHiXr0tHD8t2IA3yymTHO7vnrAHdiEajaKOlLHS+zjfcmEpjkMuR3QRwOqZYt0P7kN4AyGJmNtZtQhce0EpgQpElotFnr7aRefR0B5OhhthhpebPMOdPOpZwUgiaxpi00Y4TEyXkgR8/+mw+j8YRoM7FG7AUEbStS+AvKv6GfvV9irI97PDuBgXeSFRtBg25T14j Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 09/21, Christian Brauner wrote: > > --- a/kernel/fork.c > +++ b/kernel/fork.c > @@ -2146,12 +2146,9 @@ __latent_entropy struct task_struct *copy_process( > if (args->kthread) > p->flags |= PF_KTHREAD; > if (args->user_worker) { > - /* > - * Mark us a user worker, and block any signal that isn't > - * fatal or STOP > - */ > + /* A user worker takes only the signals nobody can block. */ > p->flags |= PF_USER_WORKER; > - siginitsetinv(&p->blocked, sigmask(SIGKILL)|sigmask(SIGSTOP)); > + siginitsetinv(&p->blocked, SIG_KERNEL_ONLY_MASK); Acked-by: Oleg Nesterov