================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc read-write to 0xffffffff884024dc of 4 bytes by task 10834 on cpu 0: pcpu_update_empty_pages mm/percpu.c:602 [inline] pcpu_block_update_hint_alloc+0x5db/0x6a0 mm/percpu.c:923 pcpu_alloc_area+0x49f/0x4d0 mm/percpu.c:1258 pcpu_alloc+0x4b3/0x10d0 mm/percpu.c:1808 __alloc_percpu+0x24/0x30 mm/percpu.c:1943 perf_trace_event_reg kernel/trace/trace_event_perf.c:121 [inline] perf_trace_event_init+0x4d2/0x7a0 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x159/0x1d0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x67/0xd0 kernel/events/core.c:10102 perf_try_init_event+0xc3/0x2b0 kernel/events/core.c:11668 perf_init_event kernel/events/core.c:11738 [inline] perf_event_alloc+0x9f0/0x1720 kernel/events/core.c:12018 __do_sys_perf_event_open kernel/events/core.c:12525 [inline] __se_sys_perf_event_open+0x5f7/0x2170 kernel/events/core.c:12416 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:12416 x64_sys_call+0x26e5/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:299 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff884024dc of 4 bytes by task 10746 on cpu 1: pcpu_alloc+0x9aa/0x10d0 mm/percpu.c:1868 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930 fib_nh_common_init+0x48/0x2b0 net/ipv4/fib_semantics.c:591 fib6_nh_init+0xdc3/0x15c0 net/ipv6/route.c:3620 ip6_route_info_create+0x7b7/0xba0 net/ipv6/route.c:3807 addrconf_f6i_alloc+0x188/0x280 net/ipv6/route.c:4583 ipv6_add_addr+0x3c8/0x820 net/ipv6/addrconf.c:1119 addrconf_add_linklocal+0x13e/0x380 net/ipv6/addrconf.c:3312 addrconf_addr_gen+0x278/0x450 net/ipv6/addrconf.c:3443 addrconf_init_auto_addrs+0x586/0x6b0 addrconf_notify+0x7ae/0x950 net/ipv6/addrconf.c:3740 notifier_call_chain kernel/notifier.c:93 [inline] raw_notifier_call_chain+0x6f/0x1d0 kernel/notifier.c:461 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:1950 __dev_notify_flags+0xff/0x1a0 dev_change_flags+0xab/0xd0 net/core/dev.c:8763 do_setlink+0x841/0x2480 net/core/rtnetlink.c:2884 __rtnl_newlink net/core/rtnetlink.c:3680 [inline] rtnl_newlink+0x11a1/0x1690 net/core/rtnetlink.c:3727 rtnetlink_rcv_msg+0x82e/0x8e0 net/core/rtnetlink.c:6595 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2559 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6613 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x58d/0x660 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x5d3/0x6e0 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:745 __sys_sendto+0x1e5/0x260 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0x78/0x90 net/socket.c:2199 x64_sys_call+0x16bb/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000051 -> 0x0000004f Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10746 Comm: syz-executor.4 Tainted: G W 6.9.0-rc3-syzkaller-00023-g2c71fdf02a95 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ================================================================== 8021q: adding VLAN 0 to HW filter on device bond0 8021q: adding VLAN 0 to HW filter on device team0 hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network 8021q: adding VLAN 0 to HW filter on device batadv0 veth0_vlan: entered promiscuous mode veth1_vlan: entered promiscuous mode veth0_macvtap: entered promiscuous mode veth1_macvtap: entered promiscuous mode batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: batadv0: Interface activated: batadv_slave_0 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: batadv0: Interface activated: batadv_slave_1 netdevsim netdevsim4 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim4 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim4 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim4 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0