syzbot

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BUG: KCSAN: data-race in can_send / can_stat_update

read-write to 0xffff888115dca990 of 8 bytes by interrupt on cpu 0:
 can_send+0x5a2/0x6d0 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:1738 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1802
 hrtimer_run_softirq+0xe4/0x2c0 kernel/time/hrtimer.c:1819
 handle_softirqs+0xbf/0x280 kernel/softirq.c:561
 run_ksoftirqd+0x1c/0x30 kernel/softirq.c:950
 smpboot_thread_fn+0x31c/0x4c0 kernel/smpboot.c:164
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888115dca990 of 8 bytes by interrupt on cpu 1:
 can_stat_update+0x1f3/0x6b0 net/can/proc.c:134
 call_timer_fn+0x3a/0x300 kernel/time/timer.c:1789
 expire_timers kernel/time/timer.c:1840 [inline]
 __run_timers kernel/time/timer.c:2414 [inline]
 __run_timer_base+0x417/0x640 kernel/time/timer.c:2426
 run_timer_base kernel/time/timer.c:2435 [inline]
 run_timer_softirq+0x31/0x70 kernel/time/timer.c:2445
 handle_softirqs+0xbf/0x280 kernel/softirq.c:561
 run_ksoftirqd+0x1c/0x30 kernel/softirq.c:950
 smpboot_thread_fn+0x31c/0x4c0 kernel/smpboot.c:164
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00000000000165b9 -> 0x00000000000165ba

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted 6.13.0-syzkaller-09998-gcabb4685d57e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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