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

read-write to 0xffff8881431fe070 of 8 bytes by interrupt on cpu 1:
 can_send+0x576/0x5d0 net/can/af_can.c:290
 j1939_send_one+0x1a9/0x1e0 net/can/j1939/main.c:353
 j1939_tp_tx_dat net/can/j1939/transport.c:646 [inline]
 j1939_session_tx_dat net/can/j1939/transport.c:838 [inline]
 j1939_xtp_txnext_transmiter net/can/j1939/transport.c:900 [inline]
 j1939_tp_txtimer+0xcab/0x1a70 net/can/j1939/transport.c:1160
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1753
 hrtimer_run_softirq+0xe4/0x2c0 kernel/time/hrtimer.c:1770
 handle_softirqs+0xc3/0x280 kernel/softirq.c:554
 do_softirq+0x5e/0x90 kernel/softirq.c:455
 __local_bh_enable_ip+0x6e/0x70 kernel/softirq.c:382
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x36/0x40 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 rt6_uncached_list_add net/ipv6/route.c:146 [inline]
 icmp6_dst_alloc+0x2c4/0x320 net/ipv6/route.c:3293
 mld_sendpack+0x2f6/0x6d0 net/ipv6/mcast.c:1807
 mld_send_initial_cr+0x12f/0x1e0 net/ipv6/mcast.c:2236
 ipv6_mc_dad_complete+0x5f/0x2c0 net/ipv6/mcast.c:2244
 addrconf_dad_completed+0x4da/0x8a0 net/ipv6/addrconf.c:4340
 addrconf_dad_work+0x891/0xbd0
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312
 worker_thread+0x526/0x6e0 kernel/workqueue.c:3389
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read-write to 0xffff8881431fe070 of 8 bytes by interrupt on cpu 0:
 can_send+0x576/0x5d0 net/can/af_can.c:290
 bcm_can_tx+0x314/0x420 net/can/bcm.c:314
 bcm_tx_timeout_handler+0xdb/0x260
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1753
 hrtimer_run_softirq+0xe4/0x2c0 kernel/time/hrtimer.c:1770
 handle_softirqs+0xc3/0x280 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0x3e/0x90 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x73/0x80 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 get_random_bytes+0x0/0x30
 eth_random_addr include/linux/etherdevice.h:238 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:755 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0x204/0x5b0 drivers/net/netdevsim/dev.c:850
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312
 worker_thread+0x526/0x6e0 kernel/workqueue.c:3389
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x000000000000332e -> 0x000000000000332f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.11.0-rc5-syzkaller-00050-g3ec3f5fc4a91 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events nsim_dev_trap_report_work
==================================================================