==================================================================
BUG: KCSAN: data-race in can_rcv_filter / can_rcv_filter

read-write to 0xffff888100a6b018 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
 canfd_rcv+0x17d/0x1f0 net/can/af_can.c:715
 __netif_receive_skb_one_core net/core/dev.c:6164 [inline]
 __netif_receive_skb net/core/dev.c:6277 [inline]
 process_backlog+0x363/0x670 net/core/dev.c:6628
 __napi_poll+0x61/0x330 net/core/dev.c:7692
 napi_poll net/core/dev.c:7755 [inline]
 net_rx_action+0x452/0x930 net/core/dev.c:7912
 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:436
 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 0xffff888100a6b018 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
 canfd_rcv+0x17d/0x1f0 net/can/af_can.c:715
 __netif_receive_skb_one_core net/core/dev.c:6164 [inline]
 __netif_receive_skb net/core/dev.c:6277 [inline]
 process_backlog+0x363/0x670 net/core/dev.c:6628
 __napi_poll+0x61/0x330 net/core/dev.c:7692
 napi_poll net/core/dev.c:7755 [inline]
 net_rx_action+0x452/0x930 net/core/dev.c:7912
 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:436
 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: 0x00000000000c8b2d -> 0x00000000000c8b2e

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
==================================================================
==================================================================
BUG: KCSAN: data-race in can_rcv_filter / can_rcv_filter

read-write to 0xffff888100a6b018 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
 canfd_rcv+0x17d/0x1f0 net/can/af_can.c:715
 __netif_receive_skb_one_core net/core/dev.c:6164 [inline]
 __netif_receive_skb net/core/dev.c:6277 [inline]
 process_backlog+0x363/0x670 net/core/dev.c:6628
 __napi_poll+0x61/0x330 net/core/dev.c:7692
 napi_poll net/core/dev.c:7755 [inline]
 net_rx_action+0x452/0x930 net/core/dev.c:7912
 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]
 release_sock+0x116/0x150 net/core/sock.c:3804
 sockopt_release_sock+0x41/0x50 net/core/sock.c:1161
 do_ip_getsockopt+0xbe3/0x10c0 net/ipv4/ip_sockglue.c:1732
 ip_getsockopt+0x5c/0x180 net/ipv4/ip_sockglue.c:1765
 tcp_getsockopt+0xad/0xe0 net/ipv4/tcp.c:4894
 sock_common_getsockopt+0x60/0x70 net/core/sock.c:3946
 do_sock_getsockopt+0x1c4/0x210 net/socket.c:2383
 __sys_getsockopt net/socket.c:2412 [inline]
 __do_sys_getsockopt net/socket.c:2419 [inline]
 __se_sys_getsockopt net/socket.c:2416 [inline]
 __x64_sys_getsockopt+0x11d/0x1a0 net/socket.c:2416
 x64_sys_call+0x2dcf/0x3020 arch/x86/include/generated/asm/syscalls_64.h:56
 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 0xffff888100a6b018 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
 canfd_rcv+0x17d/0x1f0 net/can/af_can.c:715
 __netif_receive_skb_one_core net/core/dev.c:6164 [inline]
 __netif_receive_skb net/core/dev.c:6277 [inline]
 process_backlog+0x363/0x670 net/core/dev.c:6628
 __napi_poll+0x61/0x330 net/core/dev.c:7692
 napi_poll net/core/dev.c:7755 [inline]
 net_rx_action+0x452/0x930 net/core/dev.c:7912
 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:436
 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: 0x000000000011c512 -> 0x000000000011c513

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 30 Comm: kworker/u8:1 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_unbound nsim_dev_trap_report_work
==================================================================
==================================================================
BUG: KCSAN: data-race in can_rcv_filter / can_rcv_filter

read-write to 0xffff888100a6b018 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
 canfd_rcv+0x17d/0x1f0 net/can/af_can.c:715
 __netif_receive_skb_one_core net/core/dev.c:6164 [inline]
 __netif_receive_skb net/core/dev.c:6277 [inline]
 process_backlog+0x363/0x670 net/core/dev.c:6628
 __napi_poll+0x61/0x330 net/core/dev.c:7692
 napi_poll net/core/dev.c:7755 [inline]
 net_rx_action+0x452/0x930 net/core/dev.c:7912
 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:436
 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 0xffff888100a6b018 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
 canfd_rcv+0x17d/0x1f0 net/can/af_can.c:715
 __netif_receive_skb_one_core net/core/dev.c:6164 [inline]
 __netif_receive_skb net/core/dev.c:6277 [inline]
 process_backlog+0x363/0x670 net/core/dev.c:6628
 __napi_poll+0x61/0x330 net/core/dev.c:7692
 napi_poll net/core/dev.c:7755 [inline]
 net_rx_action+0x452/0x930 net/core/dev.c:7912
 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]
 batadv_tt_local_purge+0x1a8/0x1f0 net/batman-adv/translation-table.c:1315
 batadv_tt_purge+0x2b/0x610 net/batman-adv/translation-table.c:3509
 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:436
 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: 0x00000000001c4247 -> 0x00000000001c4248

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 10197 Comm: kworker/u8:9 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: bat_events batadv_tt_purge
==================================================================