================================================================== BUG: KCSAN: data-race in wg_xmit / wg_xmit read-write to 0xffff88811a8fa158 of 8 bytes by interrupt on cpu 0: wg_xmit+0x626/0x6b0 drivers/net/wireguard/device.c:229 __netdev_start_xmit include/linux/netdevice.h:4805 [inline] netdev_start_xmit include/linux/netdevice.h:4819 [inline] xmit_one+0xc0/0x2a0 net/core/dev.c:3590 dev_hard_start_xmit+0x72/0x120 net/core/dev.c:3606 __dev_queue_xmit+0x84c/0xfe0 net/core/dev.c:4255 dev_queue_xmit include/linux/netdevice.h:2994 [inline] tipc_l2_send_msg+0x1b1/0x1d0 net/tipc/bearer.c:514 tipc_bearer_xmit_skb+0x18a/0x1e0 net/tipc/bearer.c:560 tipc_disc_timeout+0x3ff/0x430 net/tipc/discover.c:335 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1474 expire_timers+0x116/0x240 kernel/time/timer.c:1519 __run_timers+0x350/0x400 kernel/time/timer.c:1790 run_timer_softirq+0x2e/0x60 kernel/time/timer.c:1803 __do_softirq+0x158/0x2e3 kernel/softirq.c:571 __irq_exit_rcu kernel/softirq.c:650 [inline] irq_exit_rcu+0x41/0x70 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x8d/0xb0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 kcsan_setup_watchpoint+0x3e9/0x3f0 kernel/kcsan/core.c:694 folio_test_anon include/linux/page-flags.h:665 [inline] PageAnon include/linux/page-flags.h:670 [inline] zap_pte_range+0x4bc/0x1560 mm/memory.c:1436 zap_pmd_range mm/memory.c:1567 [inline] zap_pud_range mm/memory.c:1596 [inline] zap_p4d_range mm/memory.c:1617 [inline] unmap_page_range+0x3ac/0x730 mm/memory.c:1638 unmap_single_vma+0x157/0x230 mm/memory.c:1686 unmap_vmas+0xdf/0x1a0 mm/memory.c:1723 exit_mmap+0x11f/0x380 mm/mmap.c:3162 __mmput+0x27/0x1b0 kernel/fork.c:1187 mmput+0x3d/0x50 kernel/fork.c:1208 exit_mm+0xdb/0x170 kernel/exit.c:510 do_exit+0x518/0x1720 kernel/exit.c:782 __x64_sys_exit_group+0x0/0x20 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x1b/0x20 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read-write to 0xffff88811a8fa158 of 8 bytes by interrupt on cpu 1: wg_xmit+0x626/0x6b0 drivers/net/wireguard/device.c:229 __netdev_start_xmit include/linux/netdevice.h:4805 [inline] netdev_start_xmit include/linux/netdevice.h:4819 [inline] xmit_one+0xc0/0x2a0 net/core/dev.c:3590 dev_hard_start_xmit+0x72/0x120 net/core/dev.c:3606 __dev_queue_xmit+0x84c/0xfe0 net/core/dev.c:4255 dev_queue_xmit include/linux/netdevice.h:2994 [inline] tipc_l2_send_msg+0x1b1/0x1d0 net/tipc/bearer.c:514 tipc_bearer_xmit_skb+0x18a/0x1e0 net/tipc/bearer.c:560 tipc_disc_timeout+0x3ff/0x430 net/tipc/discover.c:335 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1474 expire_timers+0x116/0x240 kernel/time/timer.c:1519 __run_timers+0x350/0x400 kernel/time/timer.c:1790 run_timer_softirq+0x2e/0x60 kernel/time/timer.c:1803 __do_softirq+0x158/0x2e3 kernel/softirq.c:571 __irq_exit_rcu kernel/softirq.c:650 [inline] irq_exit_rcu+0x41/0x70 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x8d/0xb0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 is_atomic kernel/kcsan/core.c:262 [inline] should_watch kernel/kcsan/core.c:275 [inline] check_access kernel/kcsan/core.c:741 [inline] __tsan_read1+0x132/0x180 kernel/kcsan/core.c:1011 path_init+0x6d/0x950 fs/namei.c:2371 path_parentat fs/namei.c:2539 [inline] filename_parentat+0x118/0x390 fs/namei.c:2563 do_unlinkat+0x9d/0x510 fs/namei.c:4231 __do_sys_unlink fs/namei.c:4308 [inline] __se_sys_unlink fs/namei.c:4306 [inline] __x64_sys_unlink+0x2c/0x30 fs/namei.c:4306 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x00000000000002cb -> 0x00000000000002cc Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1441 Comm: udevd Not tainted 5.19.0-syzkaller-00428-g9de1f9c8ca51-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 ==================================================================