================================================================== BUG: KCSAN: data-race in can_rcv_filter / can_rcv_filter read-write to 0xffff888100ab8158 of 8 bytes by interrupt on cpu 0: deliver net/can/af_can.c:576 [inline] can_rcv_filter+0xd9/0x4f0 net/can/af_can.c:602 can_receive+0x13e/0x190 net/can/af_can.c:674 can_rcv+0x17d/0x1f0 net/can/af_can.c:699 __netif_receive_skb_one_core net/core/dev.c:6156 [inline] __netif_receive_skb net/core/dev.c:6269 [inline] process_backlog+0x363/0x670 net/core/dev.c:6620 __napi_poll+0x61/0x330 net/core/dev.c:7684 napi_poll net/core/dev.c:7747 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7899 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 do_softirq+0x45/0x60 kernel/softirq.c:523 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x2b6/0x690 net/core/skbuff.c:697 alloc_skb include/linux/skbuff.h:1383 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:819 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline] nsim_dev_trap_report_work+0x18a/0x630 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0x4de/0x9e0 kernel/workqueue.c:3358 worker_thread+0x581/0x770 kernel/workqueue.c:3439 kthread+0x22a/0x280 kernel/kthread.c:467 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read-write to 0xffff888100ab8158 of 8 bytes by interrupt on cpu 1: deliver net/can/af_can.c:576 [inline] can_rcv_filter+0xd9/0x4f0 net/can/af_can.c:602 can_receive+0x13e/0x190 net/can/af_can.c:674 can_rcv+0x17d/0x1f0 net/can/af_can.c:699 __netif_receive_skb_one_core net/core/dev.c:6156 [inline] __netif_receive_skb net/core/dev.c:6269 [inline] process_backlog+0x363/0x670 net/core/dev.c:6620 __napi_poll+0x61/0x330 net/core/dev.c:7684 napi_poll net/core/dev.c:7747 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7899 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x39/0xc0 kernel/softirq.c:723 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705 ____sys_recvmsg+0x61/0x280 net/socket.c:2799 ___sys_recvmsg+0x11f/0x3b0 net/socket.c:2854 do_recvmmsg+0x1ef/0x560 net/socket.c:2949 __sys_recvmmsg net/socket.c:3023 [inline] __do_sys_recvmmsg net/socket.c:3046 [inline] __se_sys_recvmmsg net/socket.c:3039 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3039 x64_sys_call+0x80f/0x3020 arch/x86/include/generated/asm/syscalls_64.h:300 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000002d8e02 -> 0x00000000002d8e03 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 13203 Comm: syz.9.2732 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ================================================================== ================================================================== BUG: KCSAN: data-race in can_rcv_filter / can_rcv_filter read-write to 0xffff888100ab8158 of 8 bytes by interrupt on cpu 0: deliver net/can/af_can.c:576 [inline] can_rcv_filter+0xd9/0x4f0 net/can/af_can.c:602 can_receive+0x13e/0x190 net/can/af_can.c:674 can_rcv+0x17d/0x1f0 net/can/af_can.c:699 __netif_receive_skb_one_core net/core/dev.c:6156 [inline] __netif_receive_skb net/core/dev.c:6269 [inline] process_backlog+0x363/0x670 net/core/dev.c:6620 __napi_poll+0x61/0x330 net/core/dev.c:7684 napi_poll net/core/dev.c:7747 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7899 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 do_softirq+0x45/0x60 kernel/softirq.c:523 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:450 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:196 [inline] _raw_spin_unlock_bh+0x18/0x20 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:395 [inline] lock_sock_nested+0x132/0x160 net/core/sock.c:3787 lock_sock include/net/sock.h:1709 [inline] tcp_recvmsg+0x112/0x460 net/ipv4/tcp.c:2978 inet_recvmsg+0xb7/0x290 net/ipv4/af_inet.c:891 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0xf6/0x160 net/socket.c:1100 sock_read_iter+0x169/0x1b0 net/socket.c:1170 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x6c0/0x7f0 fs/read_write.c:574 ksys_read+0xdc/0x1a0 fs/read_write.c:717 __do_sys_read fs/read_write.c:726 [inline] __se_sys_read fs/read_write.c:724 [inline] __x64_sys_read+0x40/0x50 fs/read_write.c:724 x64_sys_call+0x2886/0x3020 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read-write to 0xffff888100ab8158 of 8 bytes by interrupt on cpu 1: deliver net/can/af_can.c:576 [inline] can_rcv_filter+0xd9/0x4f0 net/can/af_can.c:602 can_receive+0x13e/0x190 net/can/af_can.c:674 can_rcv+0x17d/0x1f0 net/can/af_can.c:699 __netif_receive_skb_one_core net/core/dev.c:6156 [inline] __netif_receive_skb net/core/dev.c:6269 [inline] process_backlog+0x363/0x670 net/core/dev.c:6620 __napi_poll+0x61/0x330 net/core/dev.c:7684 napi_poll net/core/dev.c:7747 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7899 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 do_softirq+0x45/0x60 kernel/softirq.c:523 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x658/0x690 net/core/skbuff.c:697 alloc_skb include/linux/skbuff.h:1383 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:819 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline] nsim_dev_trap_report_work+0x18a/0x630 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0x4de/0x9e0 kernel/workqueue.c:3358 worker_thread+0x581/0x770 kernel/workqueue.c:3439 kthread+0x22a/0x280 kernel/kthread.c:467 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x0000000000366c61 -> 0x0000000000366c62 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound nsim_dev_trap_report_work ================================================================== ================================================================== BUG: KCSAN: data-race in can_rcv_filter / can_rcv_filter read-write to 0xffff888100ab8158 of 8 bytes by interrupt on cpu 0: deliver net/can/af_can.c:576 [inline] can_rcv_filter+0xd9/0x4f0 net/can/af_can.c:602 can_receive+0x13e/0x190 net/can/af_can.c:674 can_rcv+0x17d/0x1f0 net/can/af_can.c:699 __netif_receive_skb_one_core net/core/dev.c:6156 [inline] __netif_receive_skb net/core/dev.c:6269 [inline] process_backlog+0x363/0x670 net/core/dev.c:6620 __napi_poll+0x61/0x330 net/core/dev.c:7684 napi_poll net/core/dev.c:7747 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7899 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 do_softirq+0x45/0x60 kernel/softirq.c:523 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:450 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:196 [inline] _raw_spin_unlock_bh+0x18/0x20 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:395 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:891 [inline] nsim_dev_trap_report_work+0x52b/0x630 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0x4de/0x9e0 kernel/workqueue.c:3358 worker_thread+0x581/0x770 kernel/workqueue.c:3439 kthread+0x22a/0x280 kernel/kthread.c:467 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read-write to 0xffff888100ab8158 of 8 bytes by interrupt on cpu 1: deliver net/can/af_can.c:576 [inline] can_rcv_filter+0xd9/0x4f0 net/can/af_can.c:602 can_receive+0x13e/0x190 net/can/af_can.c:674 can_rcv+0x17d/0x1f0 net/can/af_can.c:699 __netif_receive_skb_one_core net/core/dev.c:6156 [inline] __netif_receive_skb net/core/dev.c:6269 [inline] process_backlog+0x363/0x670 net/core/dev.c:6620 __napi_poll+0x61/0x330 net/core/dev.c:7684 napi_poll net/core/dev.c:7747 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7899 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 run_ksoftirqd+0x1c/0x30 kernel/softirq.c:1063 smpboot_thread_fn+0x32a/0x510 kernel/smpboot.c:160 kthread+0x22a/0x280 kernel/kthread.c:467 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x00000000003b5267 -> 0x00000000003b5268 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 22 Comm: ksoftirqd/1 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ==================================================================