=====================================================
BUG: KMSAN: uninit-value in can_receive+0x26b/0x630 net/can/af_can.c:652
CPU: 1 PID: 19673 Comm: syz-executor.2 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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+0x5f/0xa0 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:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x6e/0x90 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu+0x226/0x270 kernel/softirq.c:423
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:435
 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 d8 bf 08 f3 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 83 c5 08 f3 eb d1 44 89
RSP: 0018:ffff8881192b7810 EFLAGS: 00000282
RAX: ffff88823fd54a80 RBX: ffff88813fd1da80 RCX: 000000023fcbca80
RDX: ffff88823fcbca80 RSI: 0000000000000270 RDI: ffff88813fd1da80
RBP: ffff8881192b7838 R08: ffffea000000000f R09: ffff88813fffa000
R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880381c5ee8 R14: 0000000000000000 R15: 0000000000000282
 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
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:351
 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f0e549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f55080cc EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:129 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:112
 kmsan_slab_alloc+0x8d/0xe0 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:298
=====================================================