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Thu, 07 May 2026 17:45:24 +0200 Date: Thu, 07 May 2026 17:45:23 +0200 Message-ID: From: y2k To: oleg@redhat.com Cc: brauner@kernel.org, linux-kernel@vger.kernel.org, syzkaller@googlegroups.com Subject: Re: WARNING in do_notify_parent (kernel/signal.c:2174) Content-Type: text/plain; charset=UTF-8 X-Provags-ID: V03:K1:l2X3vgsuekdC3fc4LNT91AFrB93jRDIVA5ADN5K2YaZhM8hpSby u6eP+E2DyuakcLa/iBmVH6qnl4mV82Dp64kModT+Xd9qHshoMYG8vA0zMw+VfCM0er2oWIP ffRh99aqW65MvYkmVrb8LkgZepvgupsfYXt8EJpiIN1OltUmRkHeB4OMJwXHLZJfs55r5v7 VT35Ql/s+v3p5eMgrQ/3g== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:Zu6oQZ54C4g=;hA3bi1FioJ/uACjOECMdJVXhWmh ny5OLVmgAfJIbS/RmjpFdZ3w+suwGhKq6jKXExN8+XRUECN69iJuYUaaLA5JfVHe7svdSVaco DKvWESlfNP5S+pKHRICi+akAo/bpnwlubGQnut0yNkvNmSPnEeiVPHUwr2XWVKwiSCL98rt8j U3cI4Cm/il1ze3UCtnNWjthcNGjIc5fadbvXTMvSAnIumdiYd7zel1GYH0u5DievBA+iqVHre ii4n7RM+DoZZa4tuh3y4HNZ4xSk8sKBcNKwkHKepEG4dv2E0k0hNPuRHZw375rVxM3h/Ssvbt IcYom8mza1tVfm7l7ielMLf8FDmEyL9jhEg3V+chux+HVUx6syXb5KTW+VTL29fdTWHezOjCe wy2MDruIjsA2Rr18TMPjhrW0bLKV2vYqzv3jjYLpLjhEnr+GnaXPtfQac6PMDFeBUOJ5qAqsk bzRwjqd/tDuX85Iid12f3XADhBfspnNrkttyxihsiPOKDxMDuDo1DEQZeIG1bcxfZyDRxKQTk Z4f/aP5vHRJk0lMR6NKgGZEqEg4aDzn5DlT/elLc6fQwo1oHrsDtD9WQtGi78vQOTgEXU7i4e vJd9dUcF9pX/epfvaeDoDXuDoL3TSL8JrTWc2HIjGhcL4k857eviBN1PMNHjyXoSS+eRYv09G oaV7qFmhMuFdWLYTa6UCQe9J+zqux1Wj4giNAOa+oP3hSU34TtSvYNgA0G0qvHaF+t0Tyy8tn dmx8YIAJBPb9RFfLhVOv0CXxxxM9nweBbVelOj4Sj1maDilpRkc/IMMWRFZAyMIwXoDpHCw3l wuufyA0c2ghkhZrX7HhI0uZV21swrllO0D9mgY3qS80coWBc9JInhoDHvU+q9YoaxdKh/akNO 5HMNpv5zBEXUGhns1fgmqLJepYH1IKXGaYGlZx/TzztfF/pr/SW4/dGsZXJ9E6GDUTLhQ8KJ4 JLI7pDhQdu9PYNSK/53MXu50iMaQaYLoWVP92Tq5dA7vm5W0ndC4HB3isHEohsIkrrL1HQbA0 4HeJizgFr6E5H/UEmw5RgEn7oV5xXvBD1p2z6Q90BliNsAboFCDiegrP2tYigYxKjbP+jRh5X tfN7uRvzSFKkVVLBNY2zglFPYbH60BDxwuu98b92YZ9PIH3BZYqCMnLPMj8OmoGQM4e4FJhDQ JiF+40lxieagmq3xsLEPycEX3fTx4GACsHjRo52He68AlT3ZLMxaApz/d9pi0ag7o8ScOW9Zr XgRu2+PaHhxQIUlHDL6ipaQyup5PXCokBePEgzDnHU8HJnbMx81EpqnDtFbVCY+MFpSacdt9B JKdDlK3YXksbhub0UfueBZ4zjOFJOo6ZkXfTfvI1BeY+yZ6cbER2BxFiQ5imD+XY5JxryPzsG wIbHGT5WNZvu1CpydaYqgYt8iCnOvIovwB+a8VfTed220ha4oBxXdo1/d09rN7X1fc6rUhBSH Squ8jmyRzxmX6l6Pq73GoMe8mK9c+M7/oC8HeHSnOLPG51pJR9+TiYYLFPi8yTGuwfRerHRsq 84IGV/Zfs413iRfws93h10Kf7TdEhfzQa8bg5dWlLwXtf925XeY3NARX7YTY8lGU2wgETFujR l54mIkd9BSz1qkZIyOk1vLZvzRApaCBRRdf95HkMwexJ71AmoD3OVfNoMA1m1DvSU5wI1HIHf Vhdh1+AnfPvhz/qYMdAUZSeaNUVO6AoHVrnuawukazgoOKvl0yoGAuw0WlhOy26QPVvE7B7V3 nU8YkwpZlRfSydj1HlMje7XkLwdGoktCN9DFOZ4farQmhg1G9c8mSdmhDPNJjqdNzcbqxOLRW SyciG+3CorpNliztSst5+QPh4WKXIHSH06uWoOA/Rcy7Nycl9sDy3gYgz9G6klrzXTeGHcUKq 15lLx9E1hHac6AZqOziLM7xmSN8UqruZV3GqvQChEmpzevrSLH+awMR63dbotv4hvvNagKGzu KfWBJmqqrMrgBo4Y3Re5N0UIsjPp/6lmdmOofMsNs7hQEu5OvgKFotcm3AgVck7WC0jpYzSCq IcqlRDXxmGUjr5UhqOHqQ5wNVj1NwSRUVi1NqyO3Ec2HV0a048PlOhHjnoQpfBxGssC9dciWR foOzLZNn5uGS61SsHZhSC/qiAgx3iaxgMakYyYd5XWMn69E1ETbRyg== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Follow-up: I found that commit 0f8e38eeb995 by Oleg Nesterov ("do_notify_parent: sanitize the valid_signal() checks") appears to be related to this WARNING. The syzkaller reproducer confirms the WARN_ON_ONCE fires in real conditions via syz_clone() with specific arguments. Kernel tested: 7.1.0-rc2-00099-gadc1e5c6203c Thanks, y2k y2k@desarrollaria.com