================================================================== BUG: KCSAN: data-race in do_signal_stop / prepare_signal read-write to 0xffff88802805a02c of 4 bytes by task 25426 on cpu 0: freezer_count include/linux/freezer.h:121 [inline] freezable_schedule include/linux/freezer.h:173 [inline] do_signal_stop+0x54f/0x6b0 kernel/signal.c:2396 get_signal+0x645/0x1440 kernel/signal.c:2730 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x109/0x1a0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88802805a02c of 4 bytes by interrupt on cpu 1: sig_task_ignored kernel/signal.c:94 [inline] sig_ignored kernel/signal.c:119 [inline] prepare_signal+0x872/0xd80 kernel/signal.c:962 send_sigqueue+0xe7/0x400 kernel/signal.c:1861 posix_timer_event kernel/time/posix-timers.c:354 [inline] posix_timer_fn+0xdd/0x1f0 kernel/time/posix-timers.c:380 __run_hrtimer+0x133/0x420 kernel/time/hrtimer.c:1519 __hrtimer_run_queues kernel/time/hrtimer.c:1583 [inline] hrtimer_interrupt+0x36e/0xa10 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1102 asm_call_irq_on_stack+0xf/0x20 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0x52/0x90 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 fib6_walk_continue+0xd7/0x430 net/ipv6/ip6_fib.c:2075 fib6_walk net/ipv6/ip6_fib.c:2158 [inline] fib6_clean_tree net/ipv6/ip6_fib.c:2238 [inline] __fib6_clean_all+0x188/0x2b0 net/ipv6/ip6_fib.c:2254 fib6_clean_all+0x26/0x30 net/ipv6/ip6_fib.c:2265 rt6_sync_up+0x9a/0xc0 net/ipv6/route.c:4666 addrconf_notify+0x1315/0x1ea0 net/ipv6/addrconf.c:3562 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x53/0xb0 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2040 [inline] netdev_state_change+0xeb/0x160 net/core/dev.c:1452 do_setlink+0x1f6/0x21d0 net/core/rtnetlink.c:2938 rtnl_group_changelink net/core/rtnetlink.c:3227 [inline] __rtnl_newlink net/core/rtnetlink.c:3381 [inline] rtnl_newlink+0xaad/0x12f0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x723/0x7c0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2494 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:5571 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x5df/0x6b0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x6f8/0x7c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x352/0x4c0 net/socket.c:2345 ___sys_sendmsg net/socket.c:2399 [inline] __sys_sendmsg+0x1ed/0x270 net/socket.c:2432 __do_sys_sendmsg net/socket.c:2441 [inline] __se_sys_sendmsg net/socket.c:2439 [inline] __x64_sys_sendmsg+0x42/0x50 net/socket.c:2439 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: 25408 Comm: syz-executor.5 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================