[moderation] [can?] KCSAN: data-race in vxcan_xmit / vxcan_xmit (2)
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syzbot
Jul 17, 2026, 11:07:30 PM (8 hours ago) Jul 17
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 111e7b23e5b0 Merge tag 'soc-fixes-7.2-1' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=137e8f1e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=84b3039e8461eef5
dashboard link: https://syzkaller.appspot.com/bug?extid=3b27f79825eb8b10ff91
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
CC: [linu...@vger.kernel.org linux-...@vger.kernel.org mai...@kernel.org m...@pengutronix.de]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/810e7b43599d/disk-111e7b23.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8655bd45657e/vmlinux-111e7b23.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e413cf8b18ab/bzImage-111e7b23.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3b27f7...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in vxcan_xmit / vxcan_xmit
read-write to 0xffff88811a6e8230 of 8 bytes by interrupt on cpu 0:
vxcan_xmit+0x2ba/0x370 drivers/net/can/vxcan.c:87
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [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+0x18b/0x630 drivers/net/netdevsim/dev.c:922
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811a6e8230 of 8 bytes by interrupt on cpu 1:
vxcan_xmit+0x2ba/0x370 drivers/net/can/vxcan.c:87
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
run_ksoftirqd+0x1c/0x30 kernel/softirq.c:1076
smpboot_thread_fn+0x32a/0x510 kernel/smpboot.c:160
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
value changed: 0x0000000000009bc0 -> 0x0000000000009bc1
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 22 Comm: ksoftirqd/1 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in can_can_gw_rcv / can_can_gw_rcv
read-write to 0xffff88811ca1af80 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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [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+0x18b/0x630 drivers/net/netdevsim/dev.c:922
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811ca1af80 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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [inline]
netlink_alloc_large_skb+0xbf/0xf0 net/netlink/af_netlink.c:1185
netlink_sendmsg+0x40c/0x6f0 net/netlink/af_netlink.c:1875
sock_sendmsg_nosec net/socket.c:775 [inline]
__sock_sendmsg net/socket.c:790 [inline]
__sys_sendto+0x411/0x470 net/socket.c:2252
__do_sys_sendto net/socket.c:2259 [inline]
__se_sys_sendto net/socket.c:2255 [inline]
__x64_sys_sendto+0x76/0x90 net/socket.c:2255
x64_sys_call+0x2d35/0x3020 arch/x86/include/generated/asm/syscalls_64.h:45
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: 0x00009c48 -> 0x00009c49
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 14276 Comm: syz.5.2986 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in vxcan_xmit / vxcan_xmit
read-write to 0xffff88811a6a8238 of 8 bytes by interrupt on cpu 0:
vxcan_xmit+0x311/0x370 drivers/net/can/vxcan.c:91
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
update_defense_level+0x594/0x5c0 net/netfilter/ipvs/ip_vs_ctl.c:210
defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811a6a8238 of 8 bytes by interrupt on cpu 1:
vxcan_xmit+0x311/0x370 drivers/net/can/vxcan.c:91
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
update_defense_level+0x594/0x5c0 net/netfilter/ipvs/ip_vs_ctl.c:210
defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
value changed: 0x0000000000064f50 -> 0x0000000000064f58
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3390 Comm: kworker/1:4 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: events_long defense_work_handler
==================================================================
==================================================================
BUG: KCSAN: data-race in can_can_gw_rcv / can_can_gw_rcv
read-write to 0xffff88811ca1af80 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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [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+0x18b/0x630 drivers/net/netdevsim/dev.c:922
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811ca1af80 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]
batadv_tt_local_purge+0x1a7/0x1f0 net/batman-adv/translation-table.c:1366
batadv_tt_purge+0x2b/0x610 net/batman-adv/translation-table.c:3565
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
value changed: 0x00029ce7 -> 0x00029ce8
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7851 Comm: kworker/u8:23 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: bat_events batadv_tt_purge
==================================================================
==================================================================
BUG: KCSAN: data-race in vxcan_xmit / vxcan_xmit
read-write to 0xffff88811a6a8228 of 8 bytes by interrupt on cpu 0:
vxcan_xmit+0x2f7/0x370 drivers/net/can/vxcan.c:90
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [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+0x18b/0x630 drivers/net/netdevsim/dev.c:922
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811a6a8228 of 8 bytes by interrupt on cpu 1:
vxcan_xmit+0x2f7/0x370 drivers/net/can/vxcan.c:90
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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]
batadv_tt_local_purge+0x1a7/0x1f0 net/batman-adv/translation-table.c:1366
batadv_tt_purge+0x2b/0x610 net/batman-adv/translation-table.c:3565
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
value changed: 0x00000000000378a6 -> 0x00000000000378a7
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7851 Comm: kworker/u8:23 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: bat_events batadv_tt_purge
==================================================================
==================================================================
BUG: KCSAN: data-race in vxcan_xmit / vxcan_xmit
read-write to 0xffff88811a6a8238 of 8 bytes by interrupt on cpu 0:
vxcan_xmit+0x311/0x370 drivers/net/can/vxcan.c:91
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
run_ksoftirqd+0x1c/0x30 kernel/softirq.c:1076
smpboot_thread_fn+0x32a/0x510 kernel/smpboot.c:160
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811a6a8238 of 8 bytes by interrupt on cpu 1:
vxcan_xmit+0x311/0x370 drivers/net/can/vxcan.c:91
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [inline]
alloc_skb_with_frags+0x7e/0x3d0 net/core/skbuff.c:6769
sock_alloc_send_pskb+0x44d/0x500 net/core/sock.c:3010
unix_dgram_sendmsg+0x384/0x1030 net/unix/af_unix.c:2136
sock_sendmsg_nosec net/socket.c:775 [inline]
__sock_sendmsg net/socket.c:790 [inline]
__sys_sendto+0x411/0x470 net/socket.c:2252
__do_sys_sendto net/socket.c:2259 [inline]
__se_sys_sendto net/socket.c:2255 [inline]
__x64_sys_sendto+0x76/0x90 net/socket.c:2255
x64_sys_call+0x2d35/0x3020 arch/x86/include/generated/asm/syscalls_64.h:45
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: 0x00000000001c4b90 -> 0x00000000001c4b98
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2969 Comm: klogd Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 111e7b23e5b0 Merge tag 'soc-fixes-7.2-1' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=137e8f1e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=84b3039e8461eef5
dashboard link: https://syzkaller.appspot.com/bug?extid=3b27f79825eb8b10ff91
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
CC: [linu...@vger.kernel.org linux-...@vger.kernel.org mai...@kernel.org m...@pengutronix.de]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/810e7b43599d/disk-111e7b23.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8655bd45657e/vmlinux-111e7b23.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e413cf8b18ab/bzImage-111e7b23.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3b27f7...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in vxcan_xmit / vxcan_xmit
read-write to 0xffff88811a6e8230 of 8 bytes by interrupt on cpu 0:
vxcan_xmit+0x2ba/0x370 drivers/net/can/vxcan.c:87
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [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+0x18b/0x630 drivers/net/netdevsim/dev.c:922
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811a6e8230 of 8 bytes by interrupt on cpu 1:
vxcan_xmit+0x2ba/0x370 drivers/net/can/vxcan.c:87
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
run_ksoftirqd+0x1c/0x30 kernel/softirq.c:1076
smpboot_thread_fn+0x32a/0x510 kernel/smpboot.c:160
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
value changed: 0x0000000000009bc0 -> 0x0000000000009bc1
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 22 Comm: ksoftirqd/1 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in can_can_gw_rcv / can_can_gw_rcv
read-write to 0xffff88811ca1af80 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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [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+0x18b/0x630 drivers/net/netdevsim/dev.c:922
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811ca1af80 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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [inline]
netlink_alloc_large_skb+0xbf/0xf0 net/netlink/af_netlink.c:1185
netlink_sendmsg+0x40c/0x6f0 net/netlink/af_netlink.c:1875
sock_sendmsg_nosec net/socket.c:775 [inline]
__sock_sendmsg net/socket.c:790 [inline]
__sys_sendto+0x411/0x470 net/socket.c:2252
__do_sys_sendto net/socket.c:2259 [inline]
__se_sys_sendto net/socket.c:2255 [inline]
__x64_sys_sendto+0x76/0x90 net/socket.c:2255
x64_sys_call+0x2d35/0x3020 arch/x86/include/generated/asm/syscalls_64.h:45
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: 0x00009c48 -> 0x00009c49
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 14276 Comm: syz.5.2986 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
==================================================================
==================================================================
BUG: KCSAN: data-race in vxcan_xmit / vxcan_xmit
read-write to 0xffff88811a6a8238 of 8 bytes by interrupt on cpu 0:
vxcan_xmit+0x311/0x370 drivers/net/can/vxcan.c:91
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
update_defense_level+0x594/0x5c0 net/netfilter/ipvs/ip_vs_ctl.c:210
defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811a6a8238 of 8 bytes by interrupt on cpu 1:
vxcan_xmit+0x311/0x370 drivers/net/can/vxcan.c:91
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
update_defense_level+0x594/0x5c0 net/netfilter/ipvs/ip_vs_ctl.c:210
defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
value changed: 0x0000000000064f50 -> 0x0000000000064f58
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3390 Comm: kworker/1:4 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: events_long defense_work_handler
==================================================================
==================================================================
BUG: KCSAN: data-race in can_can_gw_rcv / can_can_gw_rcv
read-write to 0xffff88811ca1af80 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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [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+0x18b/0x630 drivers/net/netdevsim/dev.c:922
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811ca1af80 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]
batadv_tt_local_purge+0x1a7/0x1f0 net/batman-adv/translation-table.c:1366
batadv_tt_purge+0x2b/0x610 net/batman-adv/translation-table.c:3565
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
value changed: 0x00029ce7 -> 0x00029ce8
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7851 Comm: kworker/u8:23 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: bat_events batadv_tt_purge
==================================================================
==================================================================
BUG: KCSAN: data-race in vxcan_xmit / vxcan_xmit
read-write to 0xffff88811a6a8228 of 8 bytes by interrupt on cpu 0:
vxcan_xmit+0x2f7/0x370 drivers/net/can/vxcan.c:90
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [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+0x18b/0x630 drivers/net/netdevsim/dev.c:922
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811a6a8228 of 8 bytes by interrupt on cpu 1:
vxcan_xmit+0x2f7/0x370 drivers/net/can/vxcan.c:90
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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]
batadv_tt_local_purge+0x1a7/0x1f0 net/batman-adv/translation-table.c:1366
batadv_tt_purge+0x2b/0x610 net/batman-adv/translation-table.c:3565
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
worker_thread+0x569/0x750 kernel/workqueue.c:3486
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
value changed: 0x00000000000378a6 -> 0x00000000000378a7
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7851 Comm: kworker/u8:23 Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: bat_events batadv_tt_purge
==================================================================
==================================================================
BUG: KCSAN: data-race in vxcan_xmit / vxcan_xmit
read-write to 0xffff88811a6a8238 of 8 bytes by interrupt on cpu 0:
vxcan_xmit+0x311/0x370 drivers/net/can/vxcan.c:91
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
run_ksoftirqd+0x1c/0x30 kernel/softirq.c:1076
smpboot_thread_fn+0x32a/0x510 kernel/smpboot.c:160
kthread+0x221/0x270 kernel/kthread.c:436
ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read-write to 0xffff88811a6a8238 of 8 bytes by interrupt on cpu 1:
vxcan_xmit+0x311/0x370 drivers/net/can/vxcan.c:91
__netdev_start_xmit include/linux/netdevice.h:5400 [inline]
netdev_start_xmit include/linux/netdevice.h:5409 [inline]
xmit_one net/core/dev.c:3889 [inline]
dev_hard_start_xmit+0x10c/0x380 net/core/dev.c:3905
__dev_queue_xmit+0xb97/0x1e60 net/core/dev.c:4872
dev_queue_xmit include/linux/netdevice.h:3446 [inline]
can_send+0x584/0x720 net/can/af_can.c:279
can_can_gw_rcv+0x7c6/0x820 net/can/gw.c:569
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
local_bh_enable include/linux/bottom_half.h:33 [inline]
__alloc_skb+0x6b1/0x6f0 net/core/skbuff.c:699
alloc_skb include/linux/skbuff.h:1384 [inline]
alloc_skb_with_frags+0x7e/0x3d0 net/core/skbuff.c:6769
sock_alloc_send_pskb+0x44d/0x500 net/core/sock.c:3010
unix_dgram_sendmsg+0x384/0x1030 net/unix/af_unix.c:2136
sock_sendmsg_nosec net/socket.c:775 [inline]
__sock_sendmsg net/socket.c:790 [inline]
__sys_sendto+0x411/0x470 net/socket.c:2252
__do_sys_sendto net/socket.c:2259 [inline]
__se_sys_sendto net/socket.c:2255 [inline]
__x64_sys_sendto+0x76/0x90 net/socket.c:2255
x64_sys_call+0x2d35/0x3020 arch/x86/include/generated/asm/syscalls_64.h:45
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: 0x00000000001c4b90 -> 0x00000000001c4b98
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2969 Comm: klogd Tainted: G W syzkaller #0 PREEMPT(lazy)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
==================================================================
---
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