syzbot

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BUG: KCSAN: data-race in can_can_gw_rcv / can_can_gw_rcv

read-write to 0xffff88812ed07f80 of 4 bytes by interrupt on cpu 0:
 can_can_gw_rcv+0x812/0x820 net/can/gw.c:572
 deliver net/can/af_can.c:575 [inline]
 can_rcv_filter+0xc3/0x480 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:6206 [inline]
 __netif_receive_skb net/core/dev.c:6319 [inline]
 process_backlog+0x354/0x680 net/core/dev.c:6670
 __napi_poll+0x61/0x300 net/core/dev.c:7729
 napi_poll net/core/dev.c:7792 [inline]
 net_rx_action+0x456/0x930 net/core/dev.c:7949
 handle_softirqs+0xb9/0x280 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:214
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 sctp_close+0x4ad/0x560 net/sctp/socket.c:1554
 inet_release+0xcd/0xf0 net/ipv4/af_inet.c:442
 inet6_release+0x3e/0x60 net/ipv6/af_inet6.c:472
 __sock_release net/socket.c:710 [inline]
 sock_close+0x6b/0x150 net/socket.c:1501
 __fput+0x29e/0x630 fs/file_table.c:512
 ____fput+0x1c/0x30 fs/file_table.c:540
 task_work_run+0x130/0x1a0 kernel/task_work.c:233
 get_signal+0xdc1/0xf10 kernel/signal.c:2810
 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x15d/0x8c0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x23c/0x3c0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read-write to 0xffff88812ed07f80 of 4 bytes by interrupt on cpu 1:
 can_can_gw_rcv+0x812/0x820 net/can/gw.c:572
 deliver net/can/af_can.c:575 [inline]
 can_rcv_filter+0xc3/0x480 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:6206 [inline]
 __netif_receive_skb net/core/dev.c:6319 [inline]
 process_backlog+0x354/0x680 net/core/dev.c:6670
 __napi_poll+0x61/0x300 net/core/dev.c:7729
 napi_poll net/core/dev.c:7792 [inline]
 net_rx_action+0x456/0x930 net/core/dev.c:7949
 handle_softirqs+0xb9/0x280 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:214
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 release_sock+0x10c/0x180 net/core/sock.c:3867
 sockopt_release_sock+0x41/0x50 net/core/sock.c:1163
 do_ip_getsockopt+0xbdd/0x10b0 net/ipv4/ip_sockglue.c:1732
 ip_getsockopt+0x5c/0x180 net/ipv4/ip_sockglue.c:1765
 tcp_getsockopt+0xad/0xe0 net/ipv4/tcp.c:4864
 sock_common_getsockopt+0x60/0x70 net/core/sock.c:4009
 do_sock_getsockopt+0x2f5/0x570 net/socket.c:2474
 __sys_getsockopt net/socket.c:2505 [inline]
 __do_sys_getsockopt net/socket.c:2512 [inline]
 __se_sys_getsockopt net/socket.c:2509 [inline]
 __x64_sys_getsockopt+0x11d/0x1a0 net/socket.c:2509
 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+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00003db6 -> 0x00003db7

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3295 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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vxcan1: j1939_tp_rxtimer: 0xffff8881258d9c00: Timeout. Failed to send simple message.