===================================================== BUG: KMSAN: uninit-value in can_is_canxl_skb include/linux/can/skb.h:128 [inline] BUG: KMSAN: uninit-value in can_send+0x269/0x1100 net/can/af_can.c:205 can_is_canxl_skb include/linux/can/skb.h:128 [inline] can_send+0x269/0x1100 net/can/af_can.c:205 j1939_send_one+0x40f/0x4d0 net/can/j1939/main.c:352 j1939_simple_txnext net/can/j1939/transport.c:1055 [inline] j1939_tp_txtimer+0x17fa/0x4520 net/can/j1939/transport.c:1157 __run_hrtimer+0x298/0x910 kernel/time/hrtimer.c:1685 __hrtimer_run_queues kernel/time/hrtimer.c:1749 [inline] hrtimer_run_softirq+0x4b0/0x870 kernel/time/hrtimer.c:1766 __do_softirq+0x1c5/0x7b9 kernel/softirq.c:571 invoke_softirq+0x8f/0x100 kernel/softirq.c:445 __irq_exit_rcu+0x5a/0x110 kernel/softirq.c:650 irq_exit_rcu+0xe/0x10 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x9a/0xc0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x2f/0x50 kernel/locking/spinlock.c:194 unlock_hrtimer_base kernel/time/hrtimer.c:1017 [inline] hrtimer_start_range_ns+0xaba/0xb50 kernel/time/hrtimer.c:1301 hrtimer_start include/linux/hrtimer.h:418 [inline] j1939_tp_schedule_txtimer+0xbe/0x100 net/can/j1939/transport.c:699 j1939_sk_send_loop net/can/j1939/socket.c:1143 [inline] j1939_sk_sendmsg+0x1c2c/0x25d0 net/can/j1939/socket.c:1256 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0xa8e/0xe70 net/socket.c:2482 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2536 __sys_sendmsg+0x258/0x440 net/socket.c:2565 __compat_sys_sendmsg net/compat.c:344 [inline] __do_compat_sys_sendmsg net/compat.c:351 [inline] __se_compat_sys_sendmsg net/compat.c:348 [inline] __ia32_compat_sys_sendmsg+0x99/0xe0 net/compat.c:348 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Uninit was created at: slab_post_alloc_hook mm/slab.h:742 [inline] slab_alloc_node mm/slub.c:3398 [inline] __kmem_cache_alloc_node+0x6ee/0xc90 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x117/0x3d0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0x34a/0xca0 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] alloc_skb_with_frags+0xb9/0xba0 net/core/skbuff.c:6124 sock_alloc_send_pskb+0xaa8/0xc30 net/core/sock.c:2719 sock_alloc_send_skb include/net/sock.h:1884 [inline] j1939_sk_alloc_skb net/can/j1939/socket.c:864 [inline] j1939_sk_send_loop net/can/j1939/socket.c:1121 [inline] j1939_sk_sendmsg+0xd32/0x25d0 net/can/j1939/socket.c:1256 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0xa8e/0xe70 net/socket.c:2482 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2536 __sys_sendmsg+0x258/0x440 net/socket.c:2565 __compat_sys_sendmsg net/compat.c:344 [inline] __do_compat_sys_sendmsg net/compat.c:351 [inline] __se_compat_sys_sendmsg net/compat.c:348 [inline] __ia32_compat_sys_sendmsg+0x99/0xe0 net/compat.c:348 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 CPU: 1 PID: 4000 Comm: syz-executor.4 Not tainted 6.1.0-rc4-syzkaller-62821-gcb231e2f67ec #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 =====================================================