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Thu, 06 Nov 2025 23:30:27 -0800 (PST) Date: Thu, 06 Nov 2025 23:30:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <690da013.a70a0220.22f260.0024.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in alloc_pid 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: 84d39fb9d529 Add linux-next specific files for 20251105 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=164ea532580000 kernel config: https://syzkaller.appspot.com/x/.config?x=413cf24e78b667b9 dashboard link: https://syzkaller.appspot.com/bug?extid=36d7fcb891b92b056986 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=174d2084580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14a3a114580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/49de85e8d717/disk-84d39fb9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4fd90ea7659f/vmlinux-84d39fb9.xz kernel image: https://storage.googleapis.com/syzbot-assets/235e0ee874fe/bzImage-84d39fb9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+36d7fcb891b92b056986@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: ./include/linux/ns_common.h:288 at __ns_ref_active_get include/linux/ns_common.h:288 [inline], CPU#0: syz-executor/5947 WARNING: ./include/linux/ns_common.h:288 at alloc_pid+0xad6/0xc70 kernel/pid.c:285, CPU#0: syz-executor/5947 Modules linked in: CPU: 0 UID: 0 PID: 5947 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__ns_ref_active_get include/linux/ns_common.h:288 [inline] RIP: 0010:alloc_pid+0xad6/0xc70 kernel/pid.c:285 Code: cc e8 8e ab 34 00 be 02 00 00 00 eb 0a e8 82 ab 34 00 be 01 00 00 00 48 89 df e8 35 41 0a 03 e9 84 fa ff ff e8 6b ab 34 00 90 <0f> 0b 90 e9 2c fd ff ff e8 5d ab 34 00 90 0f 0b 90 e9 5b fd ff ff RSP: 0018:ffffc900034679d8 EFLAGS: 00010293 RAX: ffffffff818cc255 RBX: ffff888027d75998 RCX: ffff888027f95b80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: ffff8880288abc01 R08: ffff888027d7599b R09: 1ffff11004faeb33 R10: dffffc0000000000 R11: ffffed1004faeb34 R12: dffffc0000000000 R13: 1ffff110051157b1 R14: ffff888027d75830 R15: dffffc0000000000 FS: 0000555571fd2500(0000) GS:ffff888125a8b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2d78f156c0 CR3: 000000002fc74000 CR4: 00000000003526f0 Call Trace: copy_process+0x18e7/0x3930 kernel/fork.c:2196 kernel_clone+0x21e/0x840 kernel/fork.c:2609 __do_sys_clone kernel/fork.c:2750 [inline] __se_sys_clone kernel/fork.c:2734 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2d78185e13 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffeeee4fee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2d78185e13 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000555571fd27d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 000000000001955c R15: 00007ffeeee50080 --- 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