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Fri, 31 Jul 2026 17:45:22 -0700 (PDT) Date: Fri, 31 Jul 2026 17:45:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6d41a2.f794c993.27aeb.000d.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in kthread_affine_node From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 365f9c7a6b81 Merge branches 'for-next/core' and 'for-next/.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=145238c6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=72c97575381cec47 dashboard link: https://syzkaller.appspot.com/bug?extid=37ca7ae3e98cb65c3209 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1170a49e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16b7ffde580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/eafe0adb7386/disk-365f9c7a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/29422d607579/vmlinux-365f9c7a.xz kernel image: https://storage.googleapis.com/syzbot-assets/98ca955a8b54/Image-365f9c7a.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+37ca7ae3e98cb65c3209@syzkaller.appspotmail.com alloc_cpumask_var_node+0xfc/0x138 lib/cpumask.c:35 alloc_cpumask_var include/linux/cpumask.h:1054 [inline] zalloc_cpumask_var include/linux/cpumask.h:1060 [inline] kthread_affine_node+0x148/0x2e8 kernel/kthread.c:358 kthread+0x29c/0x3d4 kernel/kthread.c:430 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 ------------[ cut here ]------------ WARNING: kernel/kthread.c:359 at kthread_affine_node+0x200/0x2e8 kernel/kthread.c:359, CPU#0: napi/wg2-0/5207 Modules linked in: CPU: 0 UID: 0 PID: 5207 Comm: napi/wg2-0 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : kthread_affine_node+0x200/0x2e8 kernel/kthread.c:359 lr : kthread_affine_node+0x200/0x2e8 kernel/kthread.c:359 sp : ffff800095fe7d80 x29: ffff800095fe7df0 x28: 1fffe000198cf3ad x27: 1fffe000198cf483 x26: ffff0000cc67a418 x25: 1fffe000198cf3ad x24: dfff800000000000 x23: ffff700012bfcfb0 x22: ffff800095fe7d80 x21: 0000000000000000 x20: ffff0000f1573400 x19: ffff0000cc679d40 x18: 1fffe00035bc5428 x17: 70202c31206c6176 x16: 0000000000000001 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000004 x11: ffff800080156ee8 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080131d60 x2 : 0000000000000080 x1 : ffff0000cc679d40 x0 : 0000000000000000 Call trace: kthread_affine_node+0x200/0x2e8 kernel/kthread.c:359 (P) kthread+0x29c/0x3d4 kernel/kthread.c:430 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 irq event stamp: 20 hardirqs last enabled at (19): [] dump_stack_lvl+0xe8/0x12c lib/dump_stack.c:123 hardirqs last disabled at (20): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:425 softirqs last enabled at (0): [] copy_process+0x13a4/0x32e8 kernel/fork.c:2238 softirqs last disabled at (0): [<0000000000000000>] 0x0 ---[ end trace 0000000000000000 ]--- --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup