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charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in alloc_pid ------------[ cut here ]------------ WARNING: ./include/linux/ns_common.h:288 at __ns_ref_active_get include/linux/ns_common.h:288 [inline], CPU#1: syz-executor/6382 WARNING: ./include/linux/ns_common.h:288 at alloc_pid+0xad6/0xc70 kernel/pid.c:285, CPU#1: syz-executor/6382 Modules linked in: CPU: 1 UID: 0 PID: 6382 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 3e d8 34 00 be 02 00 00 00 eb 0a e8 32 d8 34 00 be 01 00 00 00 48 89 df e8 65 da 0c 03 e9 84 fa ff ff e8 1b d8 34 00 90 <0f> 0b 90 e9 2c fd ff ff e8 0d d8 34 00 90 0f 0b 90 e9 5b fd ff ff RSP: 0018:ffffc9000213f9d8 EFLAGS: 00010293 RAX: ffffffff818cfa95 RBX: ffff888074ae5998 RCX: ffff88802a181e80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: ffff888024e7a701 R08: ffff888074ae599b R09: 1ffff1100e95cb33 R10: dffffc0000000000 R11: ffffed100e95cb34 R12: dffffc0000000000 R13: 1ffff110049cf511 R14: ffff888074ae5830 R15: dffffc0000000000 FS: 000055558ad86500(0000) GS:ffff888125b79000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f201af156c0 CR3: 0000000078776000 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: 0033:0x7f201a185e13 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:00007ffe79514908 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f201a185e13 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 000055558ad867d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 00000000000271be R15: 00007ffe79514aa0 Tested on: commit: 9c0826a5 Add linux-next specific files for 20251107 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11f67012580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4f8fcc6438a785e7 dashboard link: https://syzkaller.appspot.com/bug?extid=0b2e79f91ff6579bfa5b compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1755ca92580000