================================================================== BUG: KCSAN: data-race in iptunnel_xmit / iptunnel_xmit write to 0xffff88809e20e140 of 8 bytes by interrupt on cpu 0: iptunnel_xmit_stats include/net/ip_tunnels.h:455 [inline] iptunnel_xmit+0x514/0x520 net/ipv4/ip_tunnel_core.c:86 ip_tunnel_xmit+0x9b5/0x1450 net/ipv4/ip_tunnel.c:818 sit_tunnel_xmit__+0x89/0xe0 net/ipv6/sit.c:1020 sit_tunnel_xmit+0x2a4/0x13f0 net/ipv6/sit.c:1036 __netdev_start_xmit include/linux/netdevice.h:4447 [inline] netdev_start_xmit include/linux/netdevice.h:4461 [inline] xmit_one net/core/dev.c:3420 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3436 __dev_queue_xmit+0x14e9/0x1ba0 net/core/dev.c:4013 dev_queue_xmit+0x21/0x30 net/core/dev.c:4046 neigh_direct_output+0x1f/0x30 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip_finish_output2+0x408/0xea0 net/ipv4/ip_output.c:228 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0xfe/0x230 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532 ip_queue_xmit+0x45/0x60 include/net/ip.h:237 __tcp_transmit_skb+0xea3/0x1df0 net/ipv4/tcp_output.c:1170 tcp_transmit_skb net/ipv4/tcp_output.c:1186 [inline] __tcp_retransmit_skb+0x4bd/0x15d0 net/ipv4/tcp_output.c:2977 tcp_retransmit_skb+0x36/0x1a0 net/ipv4/tcp_output.c:3000 tcp_retransmit_timer+0x70e/0x16e0 net/ipv4/tcp_timer.c:522 tcp_write_timer_handler+0x42d/0x510 net/ipv4/tcp_timer.c:605 tcp_write_timer+0x176/0x1c0 net/ipv4/tcp_timer.c:625 call_timer_fn+0x5f/0x2f0 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0xc0c/0xcd0 kernel/time/timer.c:1786 __do_softirq+0x115/0x33f kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xbb/0xe0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 page_remove_rmap+0x1e2/0x7a0 mm/rmap.c:1350 zap_pte_range mm/memory.c:1080 [inline] zap_pmd_range mm/memory.c:1184 [inline] zap_pud_range mm/memory.c:1213 [inline] zap_p4d_range mm/memory.c:1234 [inline] unmap_page_range+0xb31/0x1940 mm/memory.c:1255 unmap_single_vma+0x144/0x200 mm/memory.c:1300 unmap_vmas+0xda/0x1a0 mm/memory.c:1332 exit_mmap+0x13e/0x300 mm/mmap.c:3140 __mmput kernel/fork.c:1082 [inline] mmput+0xea/0x280 kernel/fork.c:1103 exit_mm kernel/exit.c:485 [inline] do_exit+0x4ac/0x18c0 kernel/exit.c:784 do_group_exit+0xb4/0x1c0 kernel/exit.c:895 get_signal+0x2a2/0x1320 kernel/signal.c:2734 do_signal+0x2f/0x6c0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88809e20e140 of 8 bytes by interrupt on cpu 1: iptunnel_xmit_stats include/net/ip_tunnels.h:455 [inline] iptunnel_xmit+0x501/0x520 net/ipv4/ip_tunnel_core.c:86 ip_tunnel_xmit+0x9b5/0x1450 net/ipv4/ip_tunnel.c:818 sit_tunnel_xmit__+0x89/0xe0 net/ipv6/sit.c:1020 sit_tunnel_xmit+0x2a4/0x13f0 net/ipv6/sit.c:1036 __netdev_start_xmit include/linux/netdevice.h:4447 [inline] netdev_start_xmit include/linux/netdevice.h:4461 [inline] xmit_one net/core/dev.c:3420 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3436 __dev_queue_xmit+0x14e9/0x1ba0 net/core/dev.c:4013 dev_queue_xmit+0x21/0x30 net/core/dev.c:4046 neigh_direct_output+0x1f/0x30 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip_finish_output2+0x408/0xea0 net/ipv4/ip_output.c:228 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0xfe/0x230 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532 ip_queue_xmit+0x45/0x60 include/net/ip.h:237 __tcp_transmit_skb+0xea3/0x1df0 net/ipv4/tcp_output.c:1170 tcp_transmit_skb net/ipv4/tcp_output.c:1186 [inline] __tcp_retransmit_skb+0x4bd/0x15d0 net/ipv4/tcp_output.c:2977 tcp_retransmit_skb+0x36/0x1a0 net/ipv4/tcp_output.c:3000 tcp_retransmit_timer+0x70e/0x16e0 net/ipv4/tcp_timer.c:522 tcp_write_timer_handler+0x42d/0x510 net/ipv4/tcp_timer.c:605 tcp_write_timer+0x176/0x1c0 net/ipv4/tcp_timer.c:625 call_timer_fn+0x5f/0x2f0 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0xc0c/0xcd0 kernel/time/timer.c:1786 __do_softirq+0x115/0x33f kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xbb/0xe0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 uid_eq+0x1/0x40 include/linux/uidgid.h:62 ima_get_action+0x66/0x80 security/integrity/ima/ima_api.c:192 process_measurement+0x19e/0x1190 security/integrity/ima/ima_main.c:217 ima_file_check+0x7e/0xb0 security/integrity/ima/ima_main.c:442 do_last fs/namei.c:3424 [inline] path_openat+0xfdb/0x3580 fs/namei.c:3537 do_filp_open+0x11e/0x1b0 fs/namei.c:3567 do_sys_open+0x3b3/0x4f0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x55/0x70 fs/open.c:1110 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 20324 Comm: blkid Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================