===================================================== BUG: KMSAN: uninit-value in can_receive+0x26b/0x630 net/can/af_can.c:652 CPU: 1 PID: 18791 Comm: syz-executor.3 Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122 __msan_warning+0x55/0x90 mm/kmsan/kmsan_instr.c:201 can_receive+0x26b/0x630 net/can/af_can.c:652 can_rcv+0x1fb/0x410 net/can/af_can.c:688 __netif_receive_skb_one_core net/core/dev.c:5286 [inline] __netif_receive_skb+0x1ec/0x640 net/core/dev.c:5400 process_backlog+0x523/0xc10 net/core/dev.c:6242 napi_poll+0x4aa/0x1090 net/core/dev.c:6688 net_rx_action+0x35c/0xd40 net/core/dev.c:6758 __do_softirq+0x1b9/0x7ed kernel/softirq.c:299 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:27 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:79 [inline] do_softirq_own_stack+0x73/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:396 [inline] __irq_exit_rcu+0x226/0x270 kernel/softirq.c:426 irq_exit_rcu+0xe/0x10 kernel/softirq.c:438 sysvec_apic_timer_interrupt+0x106/0x130 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:599 RIP: 0010:_raw_spin_unlock_irqrestore+0x4b/0x70 kernel/locking/spinlock.c:192 Code: 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 28 48 89 df e8 f8 a1 4a f1 c6 00 00 c6 03 00 4d 85 e4 75 1c 4c 89 7d d8 ff 75 d8 9d <48> 83 c4 08 5b 41 5c 41 5e 41 5f 5d c3 e8 43 a7 4a f1 eb d1 44 89 RSP: 0018:ffff88802de7f890 EFLAGS: 00000286 RAX: ffff88821fd3bc40 RBX: ffff88812fd1dc40 RCX: 000000021fc9cc40 RDX: ffff88821fc9cc40 RSI: 00000000000004a0 RDI: ffff88812fd1dc40 RBP: ffff88802de7f8b8 R08: ffffea000000000f R09: ffff88812fffa000 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880349d36e8 R14: 0000000000000000 R15: 0000000000000286 unlock_hrtimer_base kernel/time/hrtimer.c:902 [inline] hrtimer_start_range_ns+0x451/0x4d0 kernel/time/hrtimer.c:1140 hrtimer_start include/linux/hrtimer.h:422 [inline] j1939_tp_schedule_txtimer+0x132/0x1b0 net/can/j1939/transport.c:678 j1939_sk_send_loop net/can/j1939/socket.c:1061 [inline] j1939_sk_sendmsg+0x1c7b/0x28e0 net/can/j1939/socket.c:1174 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xc7a/0x1240 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmsg+0x6d5/0x830 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2447 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2447 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5a70435c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002e280 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 000000000169fb7f R14: 00007f5a704369c0 R15: 000000000118bf2c Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:143 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:126 kmsan_slab_alloc+0x83/0xd0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2903 [inline] __kmalloc_node_track_caller+0x7de/0x1320 mm/slub.c:4507 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x309/0xae0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] j1939_tp_tx_dat_new net/can/j1939/transport.c:575 [inline] j1939_xtp_do_tx_ctl net/can/j1939/transport.c:635 [inline] j1939_tp_tx_ctl net/can/j1939/transport.c:653 [inline] j1939_session_tx_rts net/can/j1939/transport.c:721 [inline] j1939_xtp_txnext_transmiter net/can/j1939/transport.c:853 [inline] j1939_tp_txtimer+0x40cb/0x7950 net/can/j1939/transport.c:1116 __run_hrtimer+0x478/0xec0 kernel/time/hrtimer.c:1524 __hrtimer_run_queues kernel/time/hrtimer.c:1588 [inline] hrtimer_run_softirq+0x3bf/0x690 kernel/time/hrtimer.c:1605 __do_softirq+0x1b9/0x7ed kernel/softirq.c:299 =====================================================