================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_balance_workfn write to 0xffffffff86dec724 of 4 bytes by task 25 on cpu 1: pcpu_update_empty_pages mm/percpu.c:606 [inline] pcpu_chunk_populated mm/percpu.c:1534 [inline] pcpu_balance_populated mm/percpu.c:2094 [inline] pcpu_balance_workfn+0xb63/0xd10 mm/percpu.c:2245 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307 worker_thread+0x616/0xa70 kernel/workqueue.c:2454 kthread+0x1bf/0x1e0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 read to 0xffffffff86dec724 of 4 bytes by task 5326 on cpu 0: pcpu_alloc+0x99c/0xf50 mm/percpu.c:1877 __alloc_percpu+0x20/0x30 mm/percpu.c:1949 ipv4_mib_init_net+0xba/0x2c0 net/ipv4/af_inet.c:1760 ops_init+0x1e7/0x230 net/core/net_namespace.c:140 setup_net+0x29b/0x7e0 net/core/net_namespace.c:330 copy_net_ns+0x2a9/0x450 net/core/net_namespace.c:474 create_new_namespaces+0x231/0x560 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xe2/0x120 kernel/nsproxy.c:226 ksys_unshare+0x376/0x6f0 kernel/fork.c:3058 __do_sys_unshare kernel/fork.c:3129 [inline] __se_sys_unshare kernel/fork.c:3127 [inline] __x64_sys_unshare+0x1b/0x20 kernel/fork.c:3127 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000001 -> 0x00000004 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 5326 Comm: syz-executor.1 Not tainted 5.17.0-rc6-syzkaller-00228-gac84e82f78cb-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================