------------[ cut here ]------------ WARNING: ./include/linux/skbuff.h:3003 at skb_reset_mac_len include/linux/skbuff.h:-1 [inline], CPU#0: syz.0.199/5457 WARNING: ./include/linux/skbuff.h:3003 at __netif_receive_skb_core+0x260/0x2b60 net/core/dev.c:6061, CPU#0: syz.0.199/5457 Modules linked in: CPU: 0 UID: 0 PID: 5457 Comm: syz.0.199 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 43400005 (nZcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : skb_reset_mac_len include/linux/skbuff.h:-1 [inline] pc : __netif_receive_skb_core+0x260/0x2b60 net/core/dev.c:6061 lr : skb_reset_mac_len include/linux/skbuff.h:3003 [inline] lr : __netif_receive_skb_core+0x25c/0x2b60 net/core/dev.c:6061 sp : ffff80008ec37880 x29: ffff80008ec37ac0 x28: ffff700011d86f30 x27: dfff800000000000 x26: 1ffff00011d1bfc0 x25: ffff0000dbce0000 x24: ffff80008ec37980 x23: ffff0000dbc35880 x22: 0000000000000000 x21: 0000000000000000 x20: 000000000000ffff x19: ffff0000d7d2cdc0 x18: 00000000ffffffff x17: ffff800125154000 x16: ffff80008ec30000 x15: ffff800080d14b9c x14: ffff80008b0df2b0 x13: 0000000000000009 x12: 0000000000000000 x11: 0000000009528823 x10: 0000000000000003 x9 : 0000000000000101 x8 : 0000000000000000 x7 : ffff800084d0f334 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800084d05aac x2 : 000000000000ffff x1 : ffff0000dbc35880 x0 : 0000000000000000 Call trace: skb_reset_mac_len include/linux/skbuff.h:-1 [inline] (P) __netif_receive_skb_core+0x260/0x2b60 net/core/dev.c:6061 (P) __netif_receive_skb_one_core+0x70/0x110 net/core/dev.c:6262 __netif_receive_skb+0x34/0x128 net/core/dev.c:6377 process_backlog+0x5f4/0x16f8 net/core/dev.c:6728 __napi_poll+0xb4/0x328 net/core/dev.c:7787 napi_poll net/core/dev.c:7850 [inline] net_rx_action+0x5b0/0xc14 net/core/dev.c:8007 handle_softirqs+0x2ec/0xd98 kernel/softirq.c:645 __do_softirq+0x14/0x20 kernel/softirq.c:679 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:885 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 do_softirq+0x90/0xf8 kernel/softirq.c:546 __local_bh_enable_ip+0x240/0x35c kernel/softirq.c:473 local_bh_enable include/linux/bottom_half.h:33 [inline] netif_rx+0xb4/0xd4 net/core/dev.c:5837 slcan_bump_err drivers/net/can/slcan/slcan-core.c:448 [inline] slcan_bump drivers/net/can/slcan/slcan-core.c:463 [inline] slcan_unesc drivers/net/can/slcan/slcan-core.c:476 [inline] slcan_receive_buf+0x12f8/0x1a68 drivers/net/can/slcan/slcan-core.c:807 tiocsti+0x234/0x2ec drivers/tty/tty_io.c:2263 tty_ioctl+0x364/0xcb0 drivers/tty/tty_io.c:2679 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 irq event stamp: 3561 hardirqs last enabled at (3560): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:219 [inline] hardirqs last enabled at (3560): [] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:229 hardirqs last disabled at (3561): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445 softirqs last enabled at (3554): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (3554): [] netif_rx+0xac/0xd4 net/core/dev.c:5837 softirqs last disabled at (3555): [] __do_softirq+0x14/0x20 kernel/softirq.c:679 ---[ end trace 0000000000000000 ]---