BUG: KCSAN: data-race in data_alloc / prb_reserve write to 0xffffffff86870570 of 8 bytes by task 25048 on cpu 0: data_alloc+0x27d/0x2b0 kernel/printk/printk_ringbuffer.c:1096 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 dump_stack_print_info+0xee/0x1b0 lib/dump_stack.c:57 __dump_stack+0x11/0x30 lib/dump_stack.c:93 dump_stack_lvl+0xe8/0x140 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x265/0x280 lib/fault-inject.c:174 should_fail+0xb/0x20 lib/fault-inject.c:184 should_fail_usercopy+0x1a/0x20 lib/fault-inject-usercopy.c:37 _inline_copy_from_user include/linux/uaccess.h:163 [inline] _copy_from_user+0x1c/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_from_sockptr_offset include/linux/sockptr.h:48 [inline] copy_from_sockptr include/linux/sockptr.h:61 [inline] do_ip_setsockopt+0x338/0x2240 net/ipv4/ip_sockglue.c:928 ip_setsockopt+0x58/0x110 net/ipv4/ip_sockglue.c:1417 raw_setsockopt+0xbd/0x150 net/ipv4/raw.c:845 sock_common_setsockopt+0x69/0x80 net/core/sock.c:3894 do_sock_setsockopt net/socket.c:2296 [inline] __sys_setsockopt+0x184/0x200 net/socket.c:2321 __do_sys_setsockopt net/socket.c:2327 [inline] __se_sys_setsockopt net/socket.c:2324 [inline] __x64_sys_setsockopt+0x64/0x80 net/socket.c:2324 x64_sys_call+0x2bd5/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:55 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86870570 of 8 bytes by task 25035 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:482 [inline] desc_push_tail kernel/printk/printk_ringbuffer.c:778 [inline] desc_reserve kernel/printk/printk_ringbuffer.c:924 [inline] prb_reserve+0x221/0xaf0 kernel/printk/printk_ringbuffer.c:1619 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 ib_get_eth_speed+0x33d/0x4b0 drivers/infiniband/core/verbs.c:2006 siw_query_port+0x3a/0x2d0 drivers/infiniband/sw/siw/siw_verbs.c:179 iw_query_port drivers/infiniband/core/device.c:2100 [inline] ib_query_port+0x390/0x3d0 drivers/infiniband/core/device.c:2141 ib_setup_port_attrs+0x14a/0x1430 drivers/infiniband/core/sysfs.c:1429 add_one_compat_dev+0x261/0x360 drivers/infiniband/core/device.c:968 rdma_dev_init_net+0x182/0x210 drivers/infiniband/core/device.c:1184 ops_init+0x227/0x2e0 net/core/net_namespace.c:138 setup_net+0x13b/0x5f0 net/core/net_namespace.c:364 copy_net_ns+0x565/0x720 net/core/net_namespace.c:518 create_new_namespaces+0x20e/0x410 kernel/nsproxy.c:110 copy_namespaces+0x1ad/0x210 kernel/nsproxy.c:179 copy_process+0xd1b/0x1f90 kernel/fork.c:2432 kernel_clone+0x16c/0x5b0 kernel/fork.c:2844 __do_sys_clone kernel/fork.c:2987 [inline] __se_sys_clone kernel/fork.c:2971 [inline] __x64_sys_clone+0xe6/0x120 kernel/fork.c:2971 x64_sys_call+0x2c59/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x000000000006f620 -> 0x000000000010f800 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 25035 Comm: syz.9.7029 Tainted: G W 6.15.0-rc6-syzkaller-00188-gfee3e843b309 #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 ================================================================== lo speed is unknown, defaulting to 1000