================================================================== BUG: KCSAN: data-race in can_can_gw_rcv / can_can_gw_rcv read-write to 0xffff888100173620 of 4 bytes by interrupt on cpu 1: can_can_gw_rcv+0x863/0x870 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:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] process_backlog+0x363/0x670 net/core/dev.c:6666 __napi_poll+0x61/0x300 net/core/dev.c:7730 napi_poll net/core/dev.c:7793 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7950 handle_softirqs+0xb9/0x280 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x42/0xd0 kernel/softirq.c:735 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705 check_access kernel/kcsan/core.c:753 [inline] __tsan_memset+0x1d9/0x1f0 kernel/kcsan/core.c:1335 __copy_msghdr net/socket.c:2616 [inline] copy_msghdr_from_user net/socket.c:2631 [inline] recvmsg_copy_msghdr net/socket.c:2884 [inline] ___sys_recvmsg+0x36d/0x3b0 net/socket.c:2956 do_recvmmsg+0x1ef/0x560 net/socket.c:3055 __sys_recvmmsg net/socket.c:3129 [inline] __do_sys_recvmmsg net/socket.c:3152 [inline] __se_sys_recvmmsg net/socket.c:3145 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3145 x64_sys_call+0x80f/0x3020 arch/x86/include/generated/asm/syscalls_64.h:300 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read-write to 0xffff888100173620 of 4 bytes by interrupt on cpu 0: can_can_gw_rcv+0x863/0x870 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:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] process_backlog+0x363/0x670 net/core/dev.c:6666 __napi_poll+0x61/0x300 net/core/dev.c:7730 napi_poll net/core/dev.c:7793 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7950 handle_softirqs+0xb9/0x280 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x42/0xd0 kernel/softirq.c:735 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 folio_test_slab include/linux/page-flags.h:1041 [inline] folio_mapping+0x2a/0xe0 mm/util.c:726 folio_clear_dirty_for_io+0x2f/0x390 mm/page-writeback.c:2870 pageout mm/vmscan.c:677 [inline] shrink_folio_list+0x1f23/0x2840 mm/vmscan.c:1400 reclaim_folio_list+0x9f/0x1f0 mm/vmscan.c:2171 reclaim_pages+0x21e/0x280 mm/vmscan.c:2208 madvise_cold_or_pageout_pte_range+0xd6a/0xdc0 mm/madvise.c:563 walk_pmd_range mm/pagewalk.c:148 [inline] walk_pud_range mm/pagewalk.c:239 [inline] walk_p4d_range mm/pagewalk.c:280 [inline] walk_pgd_range+0xa76/0x1520 mm/pagewalk.c:321 __walk_page_range+0xdd/0x340 mm/pagewalk.c:429 walk_page_range_vma_unsafe+0x2cd/0x320 mm/pagewalk.c:733 walk_page_range_vma+0x56/0x70 mm/pagewalk.c:743 madvise_vma_behavior+0x1d4f/0x2100 mm/madvise.c:-1 madvise_walk_vmas mm/madvise.c:1713 [inline] madvise_do_behavior+0x5de/0xa10 mm/madvise.c:1929 do_madvise+0x10e/0x190 mm/madvise.c:2022 __do_sys_madvise mm/madvise.c:2031 [inline] __se_sys_madvise mm/madvise.c:2029 [inline] __x64_sys_madvise+0x63/0x80 mm/madvise.c:2029 x64_sys_call+0x1eff/0x3020 arch/x86/include/generated/asm/syscalls_64.h:29 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x000010d0 -> 0x000010d1 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 23968 Comm: syz.8.4211 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ================================================================== ================================================================== BUG: KCSAN: data-race in can_can_gw_rcv / can_can_gw_rcv read-write to 0xffff888100173620 of 4 bytes by interrupt on cpu 1: can_can_gw_rcv+0x863/0x870 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:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] process_backlog+0x363/0x670 net/core/dev.c:6666 __napi_poll+0x61/0x300 net/core/dev.c:7730 napi_poll net/core/dev.c:7793 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7950 handle_softirqs+0xb9/0x280 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x42/0xd0 kernel/softirq.c:735 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705 slab_free_hook mm/slub.c:2624 [inline] slab_free mm/slub.c:6250 [inline] kmem_cache_free+0xca/0x380 mm/slub.c:6377 anon_vma_chain_free mm/rmap.c:147 [inline] unlink_anon_vmas+0x1b9/0x360 mm/rmap.c:514 free_pgtables+0x51d/0x650 mm/memory.c:414 exit_mmap+0x37d/0x5f0 mm/mmap.c:1312 __mmput+0x28/0x1c0 kernel/fork.c:1178 mmput+0x40/0x50 kernel/fork.c:1201 exit_mm+0x113/0x1a0 kernel/exit.c:581 do_exit+0x442/0x1530 kernel/exit.c:963 do_group_exit+0x138/0x140 kernel/exit.c:1117 __do_sys_exit_group kernel/exit.c:1128 [inline] __se_sys_exit_group kernel/exit.c:1126 [inline] __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1126 x64_sys_call+0x3008/0x3020 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read-write to 0xffff888100173620 of 4 bytes by interrupt on cpu 0: can_can_gw_rcv+0x863/0x870 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:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] process_backlog+0x363/0x670 net/core/dev.c:6666 __napi_poll+0x61/0x300 net/core/dev.c:7730 napi_poll net/core/dev.c:7793 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7950 handle_softirqs+0xb9/0x280 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x42/0xd0 kernel/softirq.c:735 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 finish_task_switch+0x132/0x320 kernel/sched/core.c:5245 context_switch kernel/sched/core.c:5391 [inline] __schedule+0x936/0xd20 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0x5e/0xd0 kernel/sched/core.c:7283 schedule_hrtimeout_range_clock+0x126/0x1a0 kernel/time/sleep_timeout.c:207 schedule_hrtimeout_range+0x28/0x40 kernel/time/sleep_timeout.c:263 poll_schedule_timeout fs/select.c:241 [inline] do_poll fs/select.c:954 [inline] do_sys_poll+0xa29/0xc00 fs/select.c:1004 __do_sys_ppoll fs/select.c:1101 [inline] __se_sys_ppoll+0x1e2/0x220 fs/select.c:1081 __x64_sys_ppoll+0x67/0x80 fs/select.c:1081 x64_sys_call+0x28d3/0x3020 arch/x86/include/generated/asm/syscalls_64.h:272 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00026f9e -> 0x00026f9f Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3021 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ================================================================== ================================================================== BUG: KCSAN: data-race in can_can_gw_rcv / can_can_gw_rcv read-write to 0xffff888100173680 of 4 bytes by interrupt on cpu 1: can_can_gw_rcv+0x863/0x870 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:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] process_backlog+0x363/0x670 net/core/dev.c:6666 __napi_poll+0x61/0x300 net/core/dev.c:7730 napi_poll net/core/dev.c:7793 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7950 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] nsim_dev_trap_report drivers/net/netdevsim/dev.c:891 [inline] nsim_dev_trap_report_work+0x53b/0x640 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385 worker_thread+0x58a/0x780 kernel/workqueue.c:3466 kthread+0x22a/0x280 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 0xffff888100173680 of 4 bytes by interrupt on cpu 0: can_can_gw_rcv+0x863/0x870 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:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] process_backlog+0x363/0x670 net/core/dev.c:6666 __napi_poll+0x61/0x300 net/core/dev.c:7730 napi_poll net/core/dev.c:7793 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7950 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+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/0x640 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385 worker_thread+0x58a/0x780 kernel/workqueue.c:3466 kthread+0x22a/0x280 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: 0x0005346a -> 0x0005346b Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 23977 Comm: kworker/u8:16 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: events_unbound nsim_dev_trap_report_work ==================================================================