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AJvYcCXM9BpTIYJzhz2mGphSFneeco+NHFu6vK2W+pQ4AACsyzedqzJzWRdde2JZKn3yt2VeOGXDttRkhkXybWY=@vger.kernel.org X-Gm-Message-State: AOJu0Yy9WL0qmM77Hyl9tfQwwf6rM07w0Pf2KGGH2Nfg5XdpsBmIDyAD sVsWcrFLfuWUGQ96mt7Sh+X79c22LORcs5/ccpVjHFjQD88PEWeiERM6KrogjE37hZX7qZA53gn Sch84x46AGY35PjxSSR9J0rtLxCUNGI3cXBZ2uWZt3QsXQGoS0a8g0pJA2h0= X-Google-Smtp-Source: AGHT+IE96IZQqt2rK1+9HkR+Ou2xxjyLstdmoZGNVd8+7uYY2fEtqwNOquuUPK1gB4Vk2Mh2EXmKXYoB8Y4oWDL4EL06ZGd+32wA Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2905:b0:659:9a49:8f74 with SMTP id 006d021491bc7-65b45736683mr126458eaf.57.1765499125456; Thu, 11 Dec 2025 16:25:25 -0800 (PST) Date: Thu, 11 Dec 2025 16:25:25 -0800 In-Reply-To: <692fc776.a70a0220.2ea503.00cb.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <693b60f5.050a0220.4004e.04c5.GAE@google.com> Subject: Re: [syzbot] [fs?] [mm?] WARNING in sched_mm_cid_fork From: syzbot To: brauner@kernel.org, jack@suse.cz, kees@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: d358e5254674 Merge tag 'for-6.19/dm-changes' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11c0d1c2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=de48dccdf203ea90 dashboard link: https://syzkaller.appspot.com/bug?extid=9ca2c6e6b098bf5ae60a compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144621b4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=124621b4580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-d358e525.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3fa1d04c1a85/vmlinux-d358e525.xz kernel image: https://storage.googleapis.com/syzbot-assets/a9b253146e36/bzImage-d358e525.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/4a5df3575982/mount_1.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=11119592580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9ca2c6e6b098bf5ae60a@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: kernel/sched/core.c:10569 at sched_mm_cid_fork+0x66/0xc30 kernel/sched/core.c:10569, CPU#0: kworker/u4:4/5674 Modules linked in: CPU: 0 UID: 0 PID: 5674 Comm: kworker/u4:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:sched_mm_cid_fork+0x66/0xc30 kernel/sched/core.c:10569 Code: 4c 8b 3b 4d 85 ff 74 21 49 8d 9d d4 15 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 13 0a 00 00 31 c0 3b 03 70 04 90 <0f> 0b 90 49 8d 9f 00 01 00 00 49 8d bf c0 01 00 00 48 89 7c 24 20 RSP: 0000:ffffc900036cfbd8 EFLAGS: 00010246 RAX: 1ffff110067b79e3 RBX: ffff888033dbcf18 RCX: ffff888033dbc980 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888033dbc980 RBP: ffffc900036cfd68 R08: ffffffff8e295e83 R09: 1ffffffff1c52bd0 R10: dffffc0000000000 R11: fffffbfff1c52bd1 R12: ffff888033dbc980 R13: ffff888033dbc980 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88808d22f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6ad913e000 CR3: 0000000041a50000 CR4: 0000000000352ef0 Call Trace: bprm_execve+0xd88/0x1400 fs/exec.c:1776 kernel_execve+0x8f0/0x9f0 fs/exec.c:1919 call_usermodehelper_exec_async+0x210/0x360 kernel/umh.c:109 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.