================================================================== BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu write to 0xffff88812c01ec20 of 8 bytes by interrupt on cpu 0: hrtimer_interrupt+0x1fa/0xa40 kernel/time/hrtimer.c:1642 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0xa3/0x280 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0x80/0xd0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 inet6_fill_ifla6_attrs+0x0/0xca0 net/ipv6/addrconf.c:4330 inet6_fill_link_af+0x3d/0x70 net/ipv6/addrconf.c:5657 rtnl_fill_link_af net/core/rtnetlink.c:1615 [inline] rtnl_fill_ifinfo+0x1f74/0x2430 net/core/rtnetlink.c:1813 rtmsg_ifinfo_build_skb+0xa8/0x130 net/core/rtnetlink.c:3808 rtmsg_ifinfo_event net/core/rtnetlink.c:3840 [inline] rtmsg_ifinfo+0x58/0xc0 net/core/rtnetlink.c:3849 __dev_notify_flags+0x63/0x390 net/core/dev.c:8318 rtnl_configure_link+0x141/0x150 net/core/rtnetlink.c:3130 __rtnl_newlink net/core/rtnetlink.c:3460 [inline] rtnl_newlink+0xeb1/0x1340 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x71b/0x7b0 net/core/rtnetlink.c:5563 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2470 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:5581 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x5e2/0x6b0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x6d8/0x7a0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0x360/0x4d0 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmsg+0x1df/0x260 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x42/0x50 net/socket.c:2447 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812c01ec20 of 8 bytes by task 6623 on cpu 1: print_cpu+0x479/0x7f0 kernel/time/timer_list.c:148 timer_list_show+0x114/0x180 kernel/time/timer_list.c:311 seq_read+0x2ee/0x900 fs/seq_file.c:208 pde_read fs/proc/inode.c:306 [inline] proc_reg_read+0x116/0x1a0 fs/proc/inode.c:318 do_loop_readv_writev fs/read_write.c:734 [inline] do_iter_read+0x2df/0x4b0 fs/read_write.c:955 vfs_readv+0xa0/0xe0 fs/read_write.c:1073 kernel_readv fs/splice.c:355 [inline] default_file_splice_read+0x3b7/0x650 fs/splice.c:412 do_splice_to fs/splice.c:871 [inline] splice_direct_to_actor+0x2c7/0x660 fs/splice.c:950 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x56a/0xba0 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 6623 Comm: syz-executor.5 Not tainted 5.9.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================